/* roulang page: index */
:root {
            --bg-base: #0A1520;
            --bg-level2: #0D1B2A;
            --bg-level3: #112030;
            --bg-glass: rgba(255,255,255,0.05);
            --bg-glass-hover: rgba(255,255,255,0.09);
            --border-glass: rgba(255,255,255,0.12);
            --primary: #0D1B2A;
            --accent: #00E5A0;
            --accent-hover: #2BF2B3;
            --accent-dim: rgba(0,229,160,0.15);
            --hot: #FF7A45;
            --text-primary: #E4EDF5;
            --text-secondary: #8AA3B8;
            --text-muted: #5B7389;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 10px;
            --shadow-md: 0 8px 32px rgba(0,0,0,0.35);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.45);
            --transition: .25s ease;
            --font-sans: "PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-base);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            color: inherit;
        }
        .container {
            max-width: 1280px;
            padding-left: 24px;
            padding-right: 24px;
        }
        @media(max-width:767.98px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1080;
            height: 64px;
            background: rgba(10,21,32,.75);
            -webkit-backdrop-filter: blur(16px);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255,255,255,.08);
            transition: background .3s ease, box-shadow .3s ease;
        }
        .site-header.scrolled {
            background: rgba(10,21,32,.92);
            box-shadow: 0 8px 32px rgba(0,0,0,.45);
        }
        .navbar {
            padding: 0;
            height: 64px;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 16px;
        }
        .navbar-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            letter-spacing: .02em;
            line-height: 1.2;
        }
        .navbar-logo:hover {
            color: var(--text-primary);
        }
        .logo-dot {
            color: var(--accent);
            margin: 0 4px;
        }
        .navbar-collapse {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex: 1;
            gap: 16px;
        }
        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            margin: 0 auto;
            padding-left: 24px;
            list-style: none;
        }
        .nav-link {
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 16px !important;
            border-radius: var(--radius-sm);
            transition: color var(--transition), background var(--transition);
            position: relative;
        }
        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255,255,255,.04);
        }
        .nav-link.active {
            color: var(--accent);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,.06);
            border: 1px solid var(--border-glass);
            border-radius: 8px;
            padding: 6px 12px;
            width: 200px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .search-box:hover,
        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(0,229,160,.08);
        }
        .search-box i {
            color: var(--text-muted);
            font-size: 14px;
        }
        .search-box input {
            background: transparent;
            border: none;
            outline: none;
            color: var(--text-primary);
            font-size: 14px;
            width: 100%;
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .search-box kbd {
            background: rgba(255,255,255,.08);
            border: 1px solid rgba(255,255,255,.1);
            border-radius: 4px;
            color: var(--text-secondary);
            font-size: 11px;
            padding: 2px 6px;
            font-family: var(--font-sans);
            white-space: nowrap;
        }
        .navbar-toggler {
            border: 1px solid var(--border-glass);
            color: var(--text-primary);
            background: rgba(255,255,255,.04);
            border-radius: 8px;
            padding: 6px 10px;
            font-size: 18px;
            line-height: 1;
        }
        .navbar-toggler:focus {
            box-shadow: none;
            border-color: var(--accent);
        }
        .nav-cta {
            white-space: nowrap;
        }
        @media(max-width:991.98px) {
            .navbar-collapse {
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(10,21,32,.97);
                -webkit-backdrop-filter: blur(16px);
                backdrop-filter: blur(16px);
                border-bottom: 1px solid var(--border-glass);
                padding: 20px 24px;
                flex-direction: column;
                align-items: stretch;
            }
            .navbar-nav {
                flex-direction: column;
                gap: 4px;
                padding-left: 0;
                margin-bottom: 16px;
            }
            .nav-right {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
            }
            .search-box {
                width: 100%;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            border-radius: var(--radius-sm);
            font-weight: 600;
            padding: 10px 28px;
            font-size: 15px;
            transition: all var(--transition);
            border: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn:focus {
            box-shadow: none;
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .btn-hero-primary {
            background: var(--accent);
            color: var(--bg-base);
            padding: 14px 36px;
            font-size: 15px;
            border-radius: 10px;
            box-shadow: 0 0 24px rgba(0,229,160,.35);
            font-weight: 700;
        }
        .btn-hero-primary:hover {
            background: var(--accent-hover);
            color: var(--bg-base);
            box-shadow: 0 0 36px rgba(0,229,160,.5);
            transform: translateY(-1px);
        }
        .btn-hero-primary:active {
            transform: scale(.98);
        }
        .btn-hero-ghost {
            background: rgba(255,255,255,.06);
            color: var(--text-primary);
            border: 1px solid rgba(255,255,255,.25);
            padding: 14px 36px;
            font-size: 15px;
            border-radius: 10px;
            font-weight: 600;
            -webkit-backdrop-filter: blur(8px);
            backdrop-filter: blur(8px);
        }
        .btn-hero-ghost:hover {
            background: rgba(255,255,255,.12);
            color: var(--accent);
            border-color: var(--accent);
        }
        .btn-cta-primary {
            background: var(--accent);
            color: var(--bg-base);
            padding: 16px 48px;
            font-size: 16px;
            border-radius: 12px;
            font-weight: 700;
            box-shadow: 0 0 32px rgba(0,229,160,.4);
        }
        .btn-cta-primary:hover {
            background: var(--accent-hover);
            color: var(--bg-base);
            box-shadow: 0 0 48px rgba(0,229,160,.55);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 14px;
            border-radius: 8px;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 640px;
            display: flex;
            align-items: center;
            padding: 140px 0 80px;
            overflow: hidden;
            background: linear-gradient(135deg, #0D1B2A 0%, #122C42 100%);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: .35;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, rgba(10,21,32,.55) 0%, rgba(10,21,32,.85) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
            background-size: 48px 48px;
            z-index: 1;
            pointer-events: none;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 48px;
            flex-wrap: wrap;
        }
        .hero-content {
            flex: 1 1 54%;
            min-width: 320px;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0,229,160,.12);
            border: 1px solid rgba(0,229,160,.3);
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            padding: 5px 14px;
            border-radius: 999px;
            margin-bottom: 24px;
            letter-spacing: .03em;
        }
        .hero-tag i {
            font-size: 12px;
        }
        .hero h1 {
            font-size: 44px;
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: .01em;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .hero-line {
            width: 40px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin-bottom: 20px;
        }
        .hero-sub {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 520px;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-card {
            flex: 1 1 320px;
            max-width: 340px;
            background: rgba(255,255,255,.05);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            -webkit-backdrop-filter: blur(16px);
            backdrop-filter: blur(16px);
            padding: 24px;
            box-shadow: var(--shadow-md);
            background-image: linear-gradient(135deg, rgba(255,255,255,.08), rgba(255,255,255,.02));
        }
        .glass-header {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .glass-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent);
            box-shadow: 0 0 8px var(--accent);
        }
        .glass-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255,255,255,.06);
            font-size: 14px;
            color: var(--text-secondary);
        }
        .glass-item i {
            color: var(--accent);
            font-size: 15px;
            width: 20px;
            text-align: center;
        }
        .glass-item:last-of-type {
            border-bottom: none;
        }
        .hero-card .btn {
            margin-top: 16px;
            width: 100%;
        }
        @media(max-width:991.98px) {
            .hero {
                padding: 120px 0 60px;
                min-height: auto;
            }
            .hero h1 {
                font-size: 36px;
            }
            .hero-card {
                max-width: 100%;
                flex-basis: 100%;
            }
        }
        @media(max-width:767.98px) {
            .hero {
                padding: 100px 0 48px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .hero-sub {
                font-size: 15px;
            }
            .hero-actions .btn {
                padding: 12px 24px;
                font-size: 14px;
            }
        }

        /* ===== Stats band ===== */
        .stats-section {
            background: var(--bg-level2);
            border-top: 1px solid rgba(255,255,255,.04);
            border-bottom: 1px solid rgba(255,255,255,.04);
            padding: 48px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-item {
            padding: 16px 8px;
        }
        .stat-num {
            font-size: 44px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1;
            letter-spacing: .02em;
        }
        .stat-unit {
            font-size: 20px;
            font-weight: 600;
            color: var(--accent);
            margin-left: 2px;
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 8px;
            letter-spacing: .04em;
        }
        @media(max-width:767.98px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-num {
                font-size: 34px;
            }
            .stats-section {
                padding: 32px 0;
            }
        }

        /* ===== Steps ===== */
        .steps-section {
            padding: 96px 0;
            background: var(--bg-base);
        }
        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
        }
        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            letter-spacing: .08em;
            text-transform: uppercase;
            background: rgba(0,229,160,.08);
            border: 1px solid rgba(0,229,160,.18);
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 16px;
        }
        .section-head h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-head p {
            font-size: 16px;
            color: var(--text-secondary);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            position: relative;
        }
        .step-card {
            background: rgba(255,255,255,.05);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            position: relative;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            overflow: visible;
            background-image: linear-gradient(135deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(0,229,160,.35);
        }
        .step-num {
            font-size: 48px;
            font-weight: 700;
            color: rgba(0,229,160,.5);
            line-height: 1;
            display: block;
            margin-bottom: 20px;
        }
        .step-card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
        }
        .step-card::after {
            content: '→';
            position: absolute;
            top: 50%;
            right: -28px;
            transform: translateY(-50%);
            color: var(--accent);
            font-size: 20px;
            font-weight: 700;
            z-index: 2;
            background: var(--bg-base);
            border-radius: 50%;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(0,229,160,.25);
        }
        .step-card:last-child::after {
            display: none;
        }
        @media(max-width:991.98px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .step-card::after {
                display: none;
            }
            .steps-section {
                padding: 72px 0;
            }
        }
        @media(max-width:767.98px) {
            .steps-section {
                padding: 48px 0;
            }
            .section-head h2 {
                font-size: 26px;
            }
        }

        /* ===== Proof / Cases ===== */
        .proof-section {
            padding: 96px 0;
            background: var(--bg-level2);
        }
        .proof-grid {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 24px;
            align-items: stretch;
        }
        .proof-main {
            background: linear-gradient(135deg, rgba(0,229,160,.08), rgba(255,255,255,.03));
            border: 1px solid rgba(0,229,160,.2);
            border-radius: var(--radius-lg);
            padding: 36px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }
        .proof-main::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            background: rgba(0,229,160,.15);
            filter: blur(50px);
        }
        .proof-num {
            font-size: 64px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1;
            display: block;
            margin-bottom: 8px;
        }
        .proof-main .proof-label {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .proof-main .proof-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .proof-cards {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .proof-card {
            background: rgba(255,255,255,.05);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            transition: transform var(--transition), border-color var(--transition);
        }
        .proof-card:hover {
            transform: translateY(-2px);
            border-color: rgba(0,229,160,.25);
        }
        .proof-card blockquote {
            font-size: 15px;
            color: var(--text-primary);
            line-height: 1.7;
            margin: 0;
            font-style: normal;
        }
        .proof-source {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .proof-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), #0f8f6a);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            font-weight: 700;
            color: #0A1520;
        }
        .proof-source .name {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .proof-source .meta {
            font-size: 12px;
            color: var(--text-muted);
        }
        @media(max-width:991.98px) {
            .proof-grid {
                grid-template-columns: 1fr;
            }
            .proof-section {
                padding: 72px 0;
            }
        }
        @media(max-width:767.98px) {
            .proof-section {
                padding: 48px 0;
            }
            .proof-main {
                padding: 28px;
            }
            .proof-num {
                font-size: 44px;
            }
        }

        /* ===== News List ===== */
        .news-section {
            padding: 96px 0;
            background: var(--bg-base);
        }
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 960px;
            margin: 0 auto;
        }
        .news-card {
            display: flex;
            align-items: center;
            gap: 20px;
            background: rgba(255,255,255,.05);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: all var(--transition);
        }
        .news-card:hover {
            background: rgba(255,255,255,.08);
            border-color: rgba(0,229,160,.5);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .news-thumb {
            width: 96px;
            height: 96px;
            flex-shrink: 0;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-level3);
        }
        .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-body {
            flex: 1;
            min-width: 0;
        }
        .news-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 6px;
            font-size: 12px;
            color: var(--text-muted);
        }
        .news-category {
            background: rgba(0,229,160,.12);
            color: var(--accent);
            border: 1px solid rgba(0,229,160,.2);
            border-radius: 999px;
            padding: 2px 12px;
            font-size: 12px;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
        }
        .news-body h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
            line-height: 1.4;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .news-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin: 0;
        }
        .news-empty {
            text-align: center;
            padding: 60px 20px;
            background: rgba(255,255,255,.03);
            border: 1px dashed var(--border-glass);
            border-radius: var(--radius-lg);
        }
        .news-empty i {
            font-size: 40px;
            color: var(--text-muted);
            margin-bottom: 12px;
            display: block;
        }
        .news-empty p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
        }
        @media(max-width:767.98px) {
            .news-section {
                padding: 48px 0;
            }
            .news-card {
                flex-direction: column;
                align-items: flex-start;
                padding: 16px;
            }
            .news-thumb {
                width: 100%;
                height: 180px;
            }
            .news-body h3 {
                white-space: normal;
            }
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 96px 0;
            background: var(--bg-level2);
        }
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: rgba(255,255,255,.05);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item.open {
            border-color: rgba(0,229,160,.4);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: transparent;
            border: none;
            padding: 16px 24px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            cursor: pointer;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: rgba(255,255,255,.04);
        }
        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            border: 1px solid rgba(255,255,255,.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            flex-shrink: 0;
            transition: transform var(--transition), color var(--transition), border-color var(--transition);
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--accent);
            border-color: var(--accent);
        }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease, padding .35s ease;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            padding: 0 24px 20px;
            max-height: 400px;
        }
        @media(max-width:767.98px) {
            .faq-section {
                padding: 48px 0;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 14px;
            }
            .faq-answer {
                padding: 0 18px;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 96px 0;
            background: var(--bg-base);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 600px;
            height: 400px;
            background: radial-gradient(ellipse, rgba(0,229,160,.2) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 1;
            background: rgba(255,255,255,.04);
            border: 1px solid rgba(0,229,160,.3);
            border-radius: 24px;
            padding: 56px 48px;
            text-align: center;
            max-width: 820px;
            margin: 0 auto;
            box-shadow: 0 0 60px rgba(0,229,160,.08);
            background-image: radial-gradient(circle at 50% 0%, rgba(0,229,160,.1), transparent 60%);
        }
        .cta-inner h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .cta-inner p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-security {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 20px;
        }
        .cta-security i {
            color: var(--accent);
        }
        @media(max-width:767.98px) {
            .cta-section {
                padding: 48px 0;
            }
            .cta-inner {
                padding: 36px 20px;
                border-radius: 16px;
            }
            .cta-inner h2 {
                font-size: 26px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #081119;
            border-top: 1px solid rgba(255,255,255,.06);
            padding-top: 56px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 4fr 2fr 2fr 3fr;
            gap: 40px;
            padding-bottom: 48px;
        }
        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: .02em;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .footer-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-contact-item {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .footer-contact-item i {
            color: var(--accent);
            width: 20px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,.06);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
        }
        .copyright {
            font-size: 12px;
            color: var(--text-muted);
        }
        .footer-icp {
            font-size: 12px;
            color: var(--text-muted);
        }
        @media(max-width:991.98px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
        }
        @media(max-width:767.98px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer {
                padding-top: 40px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Section spacing utilities ===== */
        @media(max-width:767.98px) {
            .section-head {
                margin-bottom: 32px;
            }
            .section-head h2 {
                font-size: 24px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-base: #0A1520;
            --bg-layer-2: #0D1B2A;
            --bg-layer-3: #112030;
            --accent: #00E5A0;
            --accent-bright: #2BF2B3;
            --orange: #FF7A45;
            --text-main: #E4EDF5;
            --text-secondary: #8AA3B8;
            --text-muted: #5B7389;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.12);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 24px rgba(0, 229, 160, 0.35);
            --transition-base: 0.25s ease;
            --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            background: var(--bg-base);
            color: var(--text-main);
            line-height: 1.7;
            margin: 0;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-base);
        }

        a:hover {
            color: var(--accent-bright);
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        ul,
        ol {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .container {
            max-width: 1280px;
            padding-left: 24px;
            padding-right: 24px;
        }

        @media (max-width: 767px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }

        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--accent);
            background: rgba(0, 229, 160, 0.1);
            border: 1px solid rgba(0, 229, 160, 0.25);
            padding: 6px 18px;
            border-radius: var(--radius-pill);
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .section-head h2 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .section-head p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 0;
        }

        @media (max-width: 767px) {
            .section-head {
                margin-bottom: 36px;
            }
            .section-head h2 {
                font-size: 26px;
            }
            .section-head p {
                font-size: 15px;
            }
        }

        /* ===== Header Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 21, 32, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background var(--transition-base), box-shadow var(--transition-base);
        }

        .site-header.scrolled {
            background: rgba(10, 21, 32, 0.94);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
        }

        .navbar {
            padding: 0;
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            flex-wrap: nowrap;
        }

        .navbar-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .navbar-logo:hover {
            color: var(--text-main);
        }

        .logo-dot {
            color: var(--accent);
            font-weight: 800;
            margin: 0 2px;
        }

        .navbar-toggler {
            border: 1px solid rgba(255, 255, 255, 0.15);
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-main);
            border-radius: 8px;
            padding: 6px 12px;
            font-size: 18px;
            line-height: 1;
        }

        .navbar-toggler:hover {
            border-color: var(--accent);
            color: var(--accent);
        }

        .navbar-collapse {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex: 1;
            gap: 24px;
        }

        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 32px;
            margin: 0;
            flex-direction: row;
        }

        .nav-link {
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 2px;
            position: relative;
            transition: color var(--transition-base);
            white-space: nowrap;
        }

        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 2px;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width var(--transition-base);
        }

        .nav-link:hover {
            color: var(--text-main);
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .nav-link.active {
            color: var(--accent);
        }

        .nav-link.active::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-left: auto;
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-sm);
            padding: 6px 12px;
            height: 38px;
            width: 210px;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
        }

        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 229, 160, 0.12);
        }

        .search-box i {
            font-size: 14px;
            color: var(--text-muted);
        }

        .search-box input {
            flex: 1;
            border: none;
            outline: none;
            background: transparent;
            color: var(--text-main);
            font-size: 14px;
            min-width: 0;
        }

        .search-box input::placeholder {
            color: var(--text-muted);
        }

        .search-box kbd {
            font-size: 11px;
            font-family: system-ui, sans-serif;
            color: var(--text-muted);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 4px;
            padding: 2px 6px;
            white-space: nowrap;
        }

        .nav-cta {
            white-space: nowrap;
        }

        /* 移动端导航抽屉 */
        @media (max-width: 1199px) {
            .navbar-collapse {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(10, 21, 32, 0.97);
                flex-direction: column;
                align-items: stretch;
                padding: 20px 24px 28px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
                backdrop-filter: blur(20px);
                overflow-y: auto;
                max-height: calc(100vh - 64px);
                display: none;
            }

            .navbar-collapse.show {
                display: flex;
            }

            .navbar-nav {
                flex-direction: column;
                gap: 4px;
                width: 100%;
                margin-bottom: 20px;
            }

            .nav-link {
                padding: 12px 4px;
                font-size: 16px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            }

            .nav-link::after {
                display: none;
            }

            .nav-right {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
                width: 100%;
                margin-left: 0;
            }

            .search-box {
                width: 100%;
            }

            .nav-cta {
                text-align: center;
            }
        }

        @media (max-width: 575px) {
            .navbar-logo {
                font-size: 17px;
            }
            .nav-wrapper {
                height: 58px;
            }
            .navbar-collapse {
                top: 58px;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition-base);
            border: none;
        }

        .btn-primary-glow {
            background: var(--accent);
            color: var(--bg-base);
            padding: 12px 32px;
            font-size: 16px;
            font-weight: 700;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-glow);
        }

        .btn-primary-glow:hover {
            background: var(--accent-bright);
            color: var(--bg-base);
            box-shadow: 0 0 36px rgba(0, 229, 160, 0.5);
            transform: translateY(-2px);
        }

        .btn-primary-glow:active {
            transform: scale(0.98);
        }

        .btn-glass {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-main);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 12px 32px;
            font-size: 16px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            backdrop-filter: blur(8px);
        }

        .btn-glass:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--accent);
            color: var(--text-main);
            transform: translateY(-2px);
        }

        .btn-glass:active {
            transform: scale(0.98);
        }

        .btn-lg {
            padding: 16px 42px;
            font-size: 17px;
            border-radius: var(--radius-md);
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 14px;
            border-radius: 8px;
        }

        /* ===== Page Hero ===== */
        .page-hero {
            position: relative;
            padding: 164px 0 108px;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
        }

        .page-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 21, 32, 0.92), rgba(13, 27, 42, 0.82));
            z-index: 1;
        }

        .page-hero::after {
            content: "";
            position: absolute;
            top: -120px;
            right: -80px;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(0, 229, 160, 0.16), transparent 65%);
            z-index: 1;
            pointer-events: none;
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
        }

        .page-hero-inner {
            max-width: 760px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 600;
            color: var(--accent);
            background: rgba(0, 229, 160, 0.1);
            border: 1px solid rgba(0, 229, 160, 0.28);
            padding: 7px 18px;
            border-radius: var(--radius-pill);
            margin-bottom: 22px;
            letter-spacing: 0.02em;
        }

        .page-hero h1 {
            font-size: 46px;
            font-weight: 800;
            line-height: 1.22;
            color: var(--text-main);
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }

        .page-hero h1 .text-gradient {
            background: linear-gradient(120deg, var(--accent), var(--accent-bright));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-sub {
            font-size: 18px;
            line-height: 1.75;
            color: var(--text-secondary);
            margin-bottom: 36px;
            max-width: 580px;
            font-weight: 400;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-divider {
            width: 40px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin-bottom: 24px;
        }

        @media (max-width: 767px) {
            .page-hero {
                padding: 120px 0 64px;
            }
            .page-hero h1 {
                font-size: 30px;
                line-height: 1.3;
            }
            .hero-sub {
                font-size: 16px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
                text-align: center;
            }
        }

        /* ===== Breadcrumb ===== */
        .page-breadcrumb {
            background: var(--bg-layer-2);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            padding: 14px 0;
            position: relative;
            z-index: 2;
        }

        .breadcrumb-list {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb-list a {
            color: var(--text-secondary);
        }

        .breadcrumb-list a:hover {
            color: var(--accent);
        }

        .breadcrumb-list i {
            font-size: 11px;
            color: var(--text-muted);
        }

        .breadcrumb-list .current {
            color: var(--accent);
            font-weight: 500;
        }

        /* ===== Trust Strip ===== */
        .trust-strip {
            background: var(--bg-layer-2);
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            padding: 32px 0;
        }

        .trust-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .trust-item {
            text-align: center;
            padding: 16px 12px;
        }

        .trust-item+.trust-item {
            border-left: 1px solid rgba(255, 255, 255, 0.06);
        }

        .trust-num {
            display: block;
            font-size: 32px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 6px;
            letter-spacing: -0.01em;
        }

        .trust-label {
            font-size: 14px;
            color: var(--text-secondary);
        }

        @media (max-width: 991px) {
            .trust-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .trust-item+.trust-item {
                border-left: none;
            }
            .trust-item:nth-child(odd) {
                border-right: 1px solid rgba(255, 255, 255, 0.06);
            }
            .trust-item:nth-child(3) {
                border-left: none;
            }
        }

        @media (max-width: 575px) {
            .trust-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .trust-num {
                font-size: 26px;
            }
            .trust-label {
                font-size: 13px;
            }
        }

        /* ===== Overview Section ===== */
        .overview-section {
            padding: 96px 0;
            background: var(--bg-base);
            position: relative;
        }

        .overview-grid {
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            gap: 56px;
            align-items: center;
        }

        .overview-media {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .overview-media img {
            width: 100%;
            height: 420px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .overview-media:hover img {
            transform: scale(1.03);
        }

        .overview-media::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 50%, rgba(10, 21, 32, 0.5));
            pointer-events: none;
        }

        .ov-list {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .ov-item {
            display: flex;
            gap: 18px;
            align-items: flex-start;
            padding: 20px 22px;
            background: var(--glass-bg);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            backdrop-filter: blur(10px);
            transition: all var(--transition-base);
        }

        .ov-item:hover {
            border-color: rgba(0, 229, 160, 0.35);
            box-shadow: var(--shadow-card);
            transform: translateY(-3px);
        }

        .ov-icon {
            width: 46px;
            height: 46px;
            flex-shrink: 0;
            border-radius: var(--radius-sm);
            background: rgba(0, 229, 160, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 19px;
            color: var(--accent);
        }

        .ov-content h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 6px;
        }

        .ov-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        @media (max-width: 991px) {
            .overview-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .overview-media img {
                height: 300px;
            }
        }

        @media (max-width: 767px) {
            .overview-section {
                padding: 56px 0;
            }
            .ov-item {
                padding: 16px;
            }
        }

        /* ===== Methods Section ===== */
        .methods-section {
            padding: 96px 0;
            background: var(--bg-layer-2);
            position: relative;
            overflow: hidden;
        }

        .methods-section::before {
            content: "";
            position: absolute;
            bottom: -160px;
            left: -120px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 122, 69, 0.08), transparent 60%);
            pointer-events: none;
        }

        .method-card {
            height: 100%;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 34px 30px;
            position: relative;
            backdrop-filter: blur(12px);
            transition: all var(--transition-base);
            overflow: hidden;
        }

        .method-card::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -60px;
            width: 140px;
            height: 140px;
            background: radial-gradient(circle, rgba(0, 229, 160, 0.1), transparent 65%);
            transition: opacity var(--transition-base);
            opacity: 0.6;
        }

        .method-card:hover {
            border-color: rgba(0, 229, 160, 0.45);
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
        }

        .method-card:hover::before {
            opacity: 1;
        }

        .method-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            background: rgba(0, 229, 160, 0.14);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--accent);
            margin-bottom: 22px;
            transition: all var(--transition-base);
        }

        .method-card:hover .method-icon {
            box-shadow: var(--shadow-glow);
        }

        .method-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }

        .method-card>p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 18px;
        }

        .method-card ul {
            padding-top: 14px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .method-card ul li {
            font-size: 14px;
            color: var(--text-secondary);
            padding: 5px 0;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .method-card ul li::before {
            content: "\f00c";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: 12px;
            color: var(--accent);
        }

        @media (max-width: 767px) {
            .methods-section {
                padding: 56px 0;
            }
            .method-card {
                padding: 24px 20px;
                margin-bottom: 20px;
            }
        }

        /* ===== Steps Section ===== */
        .steps-section {
            padding: 96px 0;
            background: var(--bg-base);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
            gap: 20px;
            align-items: stretch;
            max-width: 1120px;
            margin: 0 auto;
        }

        .step-item {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 32px 26px;
            position: relative;
            backdrop-filter: blur(10px);
            transition: all var(--transition-base);
        }

        .step-item:hover {
            border-color: rgba(0, 229, 160, 0.35);
            box-shadow: var(--shadow-card);
            transform: translateY(-4px);
        }

        .step-num {
            display: block;
            font-size: 48px;
            font-weight: 800;
            color: rgba(0, 229, 160, 0.4);
            line-height: 1;
            margin-bottom: 18px;
            letter-spacing: -0.03em;
        }

        .step-item h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .step-arrow {
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 20px;
            padding-top: 40px;
            opacity: 0.7;
        }

        @media (max-width: 991px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
                max-width: 420px;
            }
            .step-arrow {
                transform: rotate(90deg);
                padding: 0;
                height: 28px;
                font-size: 18px;
            }
        }

        @media (max-width: 767px) {
            .steps-section {
                padding: 56px 0;
            }
            .step-item {
                padding: 24px 20px;
            }
        }

        /* ===== Device Section ===== */
        .device-section {
            padding: 96px 0;
            background: var(--bg-layer-2);
        }

        .device-card {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 20px;
            padding: 48px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            box-shadow: var(--shadow-card);
            overflow: hidden;
            position: relative;
        }

        .device-card::after {
            content: "";
            position: absolute;
            top: -100px;
            right: -80px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(0, 229, 160, 0.12), transparent 65%);
            pointer-events: none;
        }

        .device-info {
            position: relative;
            z-index: 2;
        }

        .device-info .section-tag {
            margin-bottom: 14px;
        }

        .device-info h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.3;
            margin-bottom: 14px;
        }

        .device-info>p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 26px;
            max-width: 460px;
        }

        .device-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .device-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 8px 16px;
            border-radius: var(--radius-pill);
            transition: all var(--transition-base);
        }

        .device-tag:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(0, 229, 160, 0.08);
        }

        .device-tag i {
            font-size: 16px;
            color: var(--accent);
        }

        .device-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            position: relative;
            z-index: 1;
        }

        .device-image img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .device-image:hover img {
            transform: scale(1.03);
        }

        @media (max-width: 991px) {
            .device-card {
                grid-template-columns: 1fr;
                padding: 32px;
                gap: 28px;
            }
            .device-image img {
                height: 260px;
            }
        }

        @media (max-width: 767px) {
            .device-section {
                padding: 56px 0;
            }
            .device-card {
                padding: 24px 18px;
            }
            .device-info h2 {
                font-size: 24px;
            }
            .device-tag {
                font-size: 13px;
                padding: 6px 12px;
            }
        }

        /* ===== Resource Cards ===== */
        .resource-section {
            padding: 96px 0;
            background: var(--bg-base);
        }

        .resource-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .resource-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            height: 100%;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .resource-card:hover {
            border-color: rgba(0, 229, 160, 0.4);
            box-shadow: var(--shadow-hover);
            transform: translateY(-5px);
        }

        .resource-media {
            height: 180px;
            overflow: hidden;
            position: relative;
        }

        .resource-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .resource-card:hover .resource-media img {
            transform: scale(1.05);
        }

        .resource-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .resource-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .resource-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }

        .resource-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .resource-tag {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            background: rgba(0, 229, 160, 0.08);
            border: 1px solid rgba(0, 229, 160, 0.15);
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            letter-spacing: 0.01em;
        }

        @media (max-width: 991px) {
            .resource-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }

        @media (max-width: 767px) {
            .resource-section {
                padding: 56px 0;
            }
            .resource-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .resource-media {
                height: 160px;
            }
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 96px 0;
            background: var(--bg-layer-2);
            position: relative;
            overflow: hidden;
        }

        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item.active {
            border-color: rgba(0, 229, 160, 0.35);
            box-shadow: 0 0 0 1px rgba(0, 229, 160, 0.1);
        }

        .faq-question {
            width: 100%;
            background: transparent;
            border: none;
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            text-align: left;
            color: var(--text-main);
            font-size: 15px;
            font-weight: 700;
            transition: color var(--transition-base);
        }

        .faq-question:hover {
            color: var(--accent);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            color: var(--text-secondary);
            transition: all var(--transition-base);
        }

        .faq-item.active .faq-icon {
            transform: rotate(135deg);
            background: rgba(0, 229, 160, 0.15);
            color: var(--accent);
        }

        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }

        .faq-item.active .faq-answer {
            padding: 0 24px 20px;
            max-height: 300px;
        }

        .faq-answer p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 0;
            padding-top: 4px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        @media (max-width: 767px) {
            .faq-section {
                padding: 56px 0;
            }
            .faq-question {
                padding: 15px 18px;
                font-size: 14px;
            }
            .faq-answer {
                padding: 0 18px;
            }
            .faq-item.active .faq-answer {
                padding: 0 18px 18px;
            }
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 96px 0;
            background: var(--bg-base);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            width: 720px;
            height: 720px;
            transform: translate(-50%, -50%);
            background: radial-gradient(circle, rgba(0, 229, 160, 0.1), transparent 65%);
            pointer-events: none;
        }

        .cta-card {
            position: relative;
            max-width: 860px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(0, 229, 160, 0.3);
            border-radius: 24px;
            padding: 64px 48px;
            text-align: center;
            box-shadow: 0 0 60px rgba(0, 229, 160, 0.08);
            backdrop-filter: blur(10px);
        }

        .cta-card h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 14px;
            line-height: 1.3;
        }

        .cta-card>p {
            font-size: 17px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.75;
        }

        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }

        .cta-ps {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        @media (max-width: 767px) {
            .cta-section {
                padding: 56px 0;
            }
            .cta-card {
                padding: 40px 22px;
            }
            .cta-card h2 {
                font-size: 26px;
            }
            .cta-actions {
                flex-direction: column;
                width: 100%;
            }
            .cta-actions .btn {
                width: 100%;
                text-align: center;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #081119;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 56px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 48px;
            padding-bottom: 40px;
        }

        .footer-brand .footer-logo {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            margin-bottom: 14px;
        }

        .footer-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 340px;
            margin-bottom: 0;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 18px;
            letter-spacing: 0.02em;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 9px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: all var(--transition-base);
        }

        .footer-col ul li a:hover {
            color: var(--accent);
            padding-left: 3px;
        }

        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-contact-item {
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 10px;
            line-height: 1.6;
        }

        .footer-contact-item i {
            width: 18px;
            text-align: center;
            color: var(--accent);
            font-size: 13px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }

        .copyright {
            font-size: 13px;
            color: var(--text-muted);
        }

        .footer-icp {
            font-size: 13px;
            color: var(--text-muted);
        }

        @media (max-width: 991px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 575px) {
            .site-footer {
                padding-top: 40px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
        }

        /* ===== 通用滚动条 ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg-base);
        }

        ::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.12);
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: rgba(0, 229, 160, 0.35);
        }

        /* ===== Focus 可访问性 ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

/* roulang page: article */
:root {
            --bg-base: #0A1520;
            --bg-level2: #0D1B2A;
            --bg-level3: #112030;
            --primary: #0D1B2A;
            --accent: #00E5A0;
            --hot: #FF7A45;
            --glass-bg: rgba(255,255,255,0.05);
            --glass-border: rgba(255,255,255,0.12);
            --text-main: #E4EDF5;
            --text-secondary: #8AA3B8;
            --text-weak: #5B7389;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 10px;
            --shadow-normal: 0 8px 32px rgba(0,0,0,0.35);
            --shadow-hover: 0 16px 48px rgba(0,0,0,0.45);
            --glow-shadow: 0 0 24px rgba(0,229,160,0.35);
            --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
            --transition: 0.25s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background-color: var(--bg-base);
            color: var(--text-main);
            font-size: 16px;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #2BF2B3;
        }

        img {
            max-width: 100%;
            height: auto;
        }

        button,
        input {
            font-family: inherit;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(10, 21, 32, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: background 0.3s ease, box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            background: rgba(10, 21, 32, 0.92);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
        }

        .navbar {
            padding: 0;
            min-height: 64px;
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 24px;
            padding-top: 8px;
            padding-bottom: 8px;
            flex-wrap: nowrap;
        }

        .navbar-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            transition: color var(--transition);
        }
        .navbar-logo:hover {
            color: var(--accent);
        }
        .logo-dot {
            color: var(--accent);
            margin: 0 4px;
            display: inline-block;
        }

        .navbar-toggler {
            border: 1px solid var(--glass-border);
            color: var(--text-main);
            background: var(--glass-bg);
            border-radius: 8px;
            padding: 8px 12px;
            font-size: 18px;
            line-height: 1;
            transition: border-color var(--transition), background var(--transition);
        }
        .navbar-toggler:hover {
            border-color: rgba(0, 229, 160, 0.4);
            background: rgba(255, 255, 255, 0.08);
        }
        .navbar-toggler:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(0, 229, 160, 0.3);
        }

        .navbar-collapse {
            align-items: center;
            justify-content: space-between;
            flex-grow: 1;
            gap: 16px;
        }

        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding-left: 24px;
        }

        .nav-link {
            color: var(--text-secondary) !important;
            padding: 8px 16px !important;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 500;
            letter-spacing: 0.01em;
            transition: color var(--transition), background var(--transition);
            position: relative;
        }
        .nav-link:hover,
        .nav-link:focus {
            color: var(--text-main) !important;
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-link.active {
            color: var(--accent) !important;
        }
        .nav-link.active::after {
            content: '';
            display: block;
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-left: auto;
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 8px;
            padding: 6px 12px;
            width: 220px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .search-box i {
            color: var(--text-weak);
            font-size: 14px;
        }
        .search-box input {
            background: transparent;
            border: none;
            color: var(--text-main);
            font-size: 13px;
            outline: none;
            width: 100%;
        }
        .search-box input::placeholder {
            color: var(--text-weak);
        }
        .search-box kbd {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-weak);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 4px;
            padding: 2px 6px;
            font-size: 11px;
            font-family: inherit;
            white-space: nowrap;
        }
        .search-box:hover {
            border-color: rgba(0, 229, 160, 0.4);
        }
        .search-box:focus-within {
            border-color: rgba(0, 229, 160, 0.6);
            box-shadow: 0 0 12px rgba(0, 229, 160, 0.1);
        }

        .btn {
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all 0.3s ease;
            letter-spacing: 0.01em;
        }

        .btn-hero-primary {
            background: var(--accent);
            color: #0A1520;
            border: none;
            padding: 10px 24px;
            border-radius: 10px;
            font-weight: 700;
            box-shadow: 0 0 24px rgba(0, 229, 160, 0.35);
        }
        .btn-hero-primary:hover {
            background: #2BF2B3;
            color: #0A1520;
            box-shadow: 0 0 36px rgba(0, 229, 160, 0.5);
            transform: translateY(-1px);
        }
        .btn-hero-primary:active {
            transform: scale(0.98);
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-main);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 10px 24px;
            border-radius: 10px;
            font-weight: 600;
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--accent);
            color: var(--text-main);
        }
        .btn-ghost:focus,
        .btn-hero-primary:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(0, 229, 160, 0.35);
        }

        .nav-cta {
            white-space: nowrap;
        }

        /* ===== Breadcrumb ===== */
        .article-breadcrumb {
            margin-top: 64px;
            padding: 16px 0;
            background: rgba(13, 27, 42, 0.6);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .breadcrumb-list {
            font-size: 13px;
            color: var(--text-weak);
            display: flex;
            align-items: center;
            gap: 8px;
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .breadcrumb-list a {
            color: var(--text-weak);
            transition: color var(--transition);
        }
        .breadcrumb-list a:hover {
            color: var(--accent);
        }
        .breadcrumb-list .divider {
            color: rgba(255, 255, 255, 0.2);
            font-size: 11px;
        }
        .breadcrumb-list .current {
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ===== Article Hero ===== */
        .article-hero {
            padding: 72px 0 48px;
            background: linear-gradient(135deg, #0D1B2A 0%, #122C42 100%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            position: relative;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -120px;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(0, 229, 160, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -80px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(255, 122, 69, 0.05) 0%, transparent 70%);
            pointer-events: none;
        }

        .article-hero-inner {
            max-width: 760px;
            margin: 0 auto;
            text-align: left;
            position: relative;
            z-index: 1;
        }

        .article-hero h1 {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-main);
            letter-spacing: 0.01em;
            margin-bottom: 20px;
            text-rendering: optimizeLegibility;
        }

        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            color: var(--text-weak);
            font-size: 14px;
        }
        .article-meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta-item i {
            color: var(--accent);
            font-size: 14px;
        }
        .article-category-badge {
            display: inline-block;
            background: rgba(0, 229, 160, 0.12);
            color: var(--accent);
            border-radius: 999px;
            padding: 4px 12px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        /* ===== Article Main ===== */
        .article-main {
            padding: 56px 0 72px;
        }
        .article-body-wrapper {
            max-width: 720px;
            margin: 0 auto;
        }

        .article-content {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-main);
            word-wrap: break-word;
        }
        .article-content h2,
        .article-content h3 {
            color: var(--text-main);
            font-weight: 700;
            line-height: 1.4;
            margin: 40px 0 18px;
            letter-spacing: 0.01em;
        }
        .article-content h2 {
            font-size: 26px;
        }
        .article-content h3 {
            font-size: 20px;
        }
        .article-content p {
            margin-bottom: 20px;
        }
        .article-content ul,
        .article-content ol {
            margin: 16px 0 24px;
            padding-left: 24px;
        }
        .article-content li {
            margin-bottom: 8px;
            line-height: 1.8;
        }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: rgba(0, 229, 160, 0.06);
            padding: 16px 20px;
            border-radius: 0 8px 8px 0;
            margin: 24px 0;
            color: var(--text-secondary);
            font-style: normal;
        }
        .article-content img {
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-normal);
            margin: 24px 0;
        }
        .article-content a {
            color: var(--accent);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: #2BF2B3;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 14px;
        }
        .article-content table th {
            background: var(--bg-level3);
            color: var(--text-main);
            padding: 12px 16px;
            text-align: left;
            border: 1px solid rgba(255, 255, 255, 0.08);
            font-weight: 600;
        }
        .article-content table td {
            padding: 10px 16px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            color: var(--text-secondary);
        }
        .article-content table tr:hover td {
            background: rgba(255, 255, 255, 0.02);
        }

        /* ===== Related ===== */
        .related-articles {
            margin-top: 56px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .related-articles-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 24px;
            letter-spacing: 0.01em;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            display: flex;
            flex-direction: column;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
            box-shadow: var(--shadow-normal);
            height: 100%;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(0, 229, 160, 0.35);
        }

        .related-card-cover {
            height: 180px;
            background-size: cover;
            background-position: center;
            position: relative;
            overflow: hidden;
        }
        .related-card-cover::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10, 21, 32, 0.3), transparent 40%);
        }
        .related-card-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }
        .related-card-body h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 10px;
            line-height: 1.5;
        }
        .related-card-body h3 a {
            color: var(--text-main);
            transition: color var(--transition);
        }
        .related-card-body h3 a:hover {
            color: var(--accent);
        }
        .related-card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex-grow: 1;
        }
        .related-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-weak);
            gap: 8px;
        }
        .related-card-meta i {
            margin-right: 4px;
            opacity: 0.7;
        }

        .article-actions {
            text-align: center;
            padding: 40px 0 0;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-back {
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            padding: 10px 20px;
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 10px;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .btn-back:hover {
            color: var(--accent);
            border-color: rgba(0, 229, 160, 0.4);
            background: rgba(0, 229, 160, 0.06);
        }

        /* ===== Empty State ===== */
        .article-main-alone {
            padding-top: 120px;
            min-height: 70vh;
        }
        .not-found {
            max-width: 640px;
            margin: 0 auto;
            text-align: center;
            padding: 60px 24px;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-normal);
        }
        .not-found-icon {
            font-size: 56px;
            color: var(--text-weak);
            margin-bottom: 20px;
        }
        .not-found h1 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .not-found p {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 24px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #081119;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 48px;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            display: block;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .footer-desc {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            color: var(--text-main);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
            letter-spacing: 0.01em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: var(--text-weak);
            font-size: 14px;
            transition: color 0.3s ease, padding-left 0.3s ease;
        }
        .footer-col ul li a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-weak);
            font-size: 14px;
        }
        .footer-contact-item i {
            color: var(--accent);
            width: 16px;
            flex-shrink: 0;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-weak);
        }
        .footer-bottom a {
            color: var(--text-weak);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (min-width: 992px) {
            .navbar-collapse {
                display: flex !important;
                flex-basis: auto;
                overflow: visible !important;
            }
            .navbar-collapse.collapse {
                display: flex !important;
            }
        }

        @media (max-width: 1199.98px) {
            .search-box {
                width: 180px;
            }
            .navbar-nav {
                padding-left: 8px;
            }
        }

        @media (max-width: 991.98px) {
            .container {
                padding: 0 16px;
            }

            .nav-wrapper {
                flex-wrap: wrap;
            }

            .navbar-collapse {
                width: 100%;
                padding: 12px 0 8px;
                border-top: 1px solid rgba(255, 255, 255, 0.06);
                margin-top: 8px;
            }
            .navbar-collapse.collapse:not(.show) {
                display: none;
            }
            .navbar-collapse.collapse.show {
                display: flex;
                flex-direction: column;
                align-items: stretch;
            }

            .navbar-nav {
                flex-direction: column;
                align-items: stretch;
                gap: 2px;
                padding-left: 0;
                width: 100%;
            }
            .nav-link {
                padding: 12px 12px !important;
                font-size: 16px;
            }
            .nav-link.active::after {
                left: 12px;
                transform: none;
                width: 16px;
            }

            .nav-right {
                width: 100%;
                margin-left: 0;
                padding: 0 4px;
                flex-wrap: wrap;
            }
            .search-box {
                flex: 1;
                min-width: 180px;
            }

            .related-grid {
                grid-template-columns: 1fr 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .article-hero h1 {
                font-size: 30px;
            }
        }

        @media (max-width: 767.98px) {
            body {
                font-size: 15px;
            }

            .navbar-logo {
                font-size: 17px;
            }

            .article-hero {
                padding: 56px 0 32px;
            }
            .article-hero h1 {
                font-size: 26px;
                line-height: 1.35;
            }
            .article-meta {
                gap: 12px;
            }

            .article-main {
                padding: 40px 0 48px;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .related-articles-title {
                font-size: 19px;
            }

            .article-actions {
                flex-direction: column;
                align-items: center;
                gap: 12px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
                padding: 16px 0 24px;
            }

            .not-found {
                padding: 40px 20px;
            }
            .not-found h1 {
                font-size: 24px;
            }
        }

        @media (max-width: 520px) {
            .nav-wrapper {
                gap: 12px;
            }
            .navbar-logo {
                font-size: 16px;
            }
            .search-box {
                min-width: 140px;
            }
            .search-box kbd {
                display: none;
            }
            .article-hero h1 {
                font-size: 24px;
            }
            .article-content h2 {
                font-size: 22px;
            }
            .article-content h3 {
                font-size: 18px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0A1520;
            --bg-secondary: #0D1B2A;
            --bg-tertiary: #112030;
            --accent: #00E5A0;
            --accent-hover: #2BF2B3;
            --accent-glow: rgba(0, 229, 160, 0.35);
            --accent-orange: #FF7A45;
            --text-primary: #E4EDF5;
            --text-secondary: #8AA3B8;
            --text-muted: #5B7389;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.12);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 10px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 24px rgba(0, 229, 160, 0.35);
            --spacing-section: 96px;
            --spacing-section-tablet: 72px;
            --spacing-section-mobile: 48px;
            --font-primary: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-primary);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-primary);
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color 0.25s ease;
        }

        a:hover {
            color: var(--accent-hover);
        }

        img {
            max-width: 100%;
            height: auto;
        }

        button,
        input {
            font-family: inherit;
            outline: none;
        }

        .container {
            max-width: 1280px;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ========== Header / Nav ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 21, 32, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: background 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
        }

        .site-header.scrolled {
            background: rgba(10, 21, 32, 0.92);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
            border-bottom-color: rgba(0, 229, 160, 0.15);
        }

        .navbar {
            padding: 0;
            min-height: 64px;
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: nowrap;
            min-height: 64px;
        }

        .navbar-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 2px;
            transition: opacity 0.25s ease;
        }

        .navbar-logo:hover {
            color: var(--text-primary);
            opacity: 0.85;
        }

        .logo-dot {
            color: var(--accent);
            margin: 0 1px;
        }

        .navbar-toggler {
            border: 1px solid var(--glass-border);
            background: var(--glass-bg);
            color: var(--text-primary);
            border-radius: var(--radius-sm);
            padding: 8px 12px;
            font-size: 18px;
            line-height: 1;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(0, 229, 160, 0.2);
        }

        .navbar-collapse {
            flex-grow: 0;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            margin: 0;
            list-style: none;
        }

        .nav-item {
            position: relative;
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 14px !important;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
        }

        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-link.active {
            color: var(--accent);
            background: rgba(0, 229, 160, 0.1);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 16px;
            height: 2px;
            border-radius: 2px;
            background: var(--accent);
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-left: 16px;
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--glass-border);
            border-radius: 8px;
            padding: 6px 12px;
            width: 210px;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 229, 160, 0.12);
        }

        .search-box i {
            font-size: 13px;
            color: var(--text-muted);
        }

        .search-box input {
            flex: 1;
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-size: 13px;
            min-width: 0;
        }

        .search-box input::placeholder {
            color: var(--text-muted);
        }

        .search-box kbd {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid var(--glass-border);
            border-radius: 4px;
            color: var(--text-secondary);
            font-size: 11px;
            padding: 2px 6px;
            font-family: "Inter", system-ui, sans-serif;
            white-space: nowrap;
        }

        .nav-cta {
            white-space: nowrap;
        }

        .btn-hero-primary {
            background: var(--accent);
            color: var(--bg-primary);
            font-weight: 600;
            font-size: 15px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            border: none;
            transition: all 0.25s ease;
            box-shadow: 0 0 20px rgba(0, 229, 160, 0.25);
        }

        .btn-hero-primary:hover {
            background: var(--accent-hover);
            color: var(--bg-primary);
            box-shadow: 0 0 36px rgba(0, 229, 160, 0.45);
            transform: translateY(-1px);
        }

        .btn-hero-primary:active {
            transform: scale(0.98);
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 14px;
        }

        /* ========== Category Banner ========== */
        .category-banner {
            position: relative;
            padding: 140px 0 72px;
            background: linear-gradient(135deg, #0D1B2A 0%, #122C42 100%);
            overflow: hidden;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.35;
            z-index: 0;
        }

        .category-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, rgba(10, 21, 32, 0.85) 0%, rgba(10, 21, 32, 0.7) 50%, rgba(10, 21, 32, 0.95) 100%);
            z-index: 1;
        }

        .category-banner .container {
            position: relative;
            z-index: 2;
        }

        .category-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .category-breadcrumb a {
            color: var(--text-secondary);
        }

        .category-breadcrumb a:hover {
            color: var(--accent);
        }

        .category-breadcrumb i {
            font-size: 11px;
        }

        .category-banner h1 {
            font-size: 42px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.01em;
        }

        .category-banner h1 span {
            color: var(--accent);
        }

        .category-banner .banner-line {
            width: 40px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin-bottom: 20px;
        }

        .category-banner .banner-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
            margin-bottom: 0;
        }

        /* ========== Category Intro ========== */
        .category-intro {
            padding: var(--spacing-section) 0;
            background: var(--bg-primary);
        }

        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .intro-media {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .intro-media img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            display: block;
            transition: transform 0.5s ease;
        }

        .intro-media:hover img {
            transform: scale(1.03);
        }

        .intro-media::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: var(--radius-lg);
            box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
            pointer-events: none;
        }

        .intro-content h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .intro-content .intro-lead {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 24px;
        }

        .intro-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .intro-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .intro-list li i {
            color: var(--accent);
            font-size: 14px;
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* ========== Resource Grid ========== */
        .resource-section {
            padding: 0 0 var(--spacing-section);
            background: var(--bg-primary);
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            background: rgba(0, 229, 160, 0.1);
            border-radius: 999px;
            padding: 6px 18px;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }

        .section-header h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-header p {
            font-size: 15px;
            color: var(--text-secondary);
            max-width: 620px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .resource-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .resource-card {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .resource-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), rgba(0, 229, 160, 0.2));
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .resource-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(0, 229, 160, 0.4);
        }

        .resource-card:hover::before {
            opacity: 1;
        }

        .resource-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--accent);
            background: rgba(0, 229, 160, 0.12);
            margin-bottom: 18px;
        }

        .resource-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .resource-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .resource-card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .card-tags .tag {
            display: inline-block;
            font-size: 12px;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 999px;
            padding: 4px 12px;
            transition: all 0.25s ease;
        }

        .card-tags .tag:hover {
            color: var(--accent);
            border-color: rgba(0, 229, 160, 0.4);
        }

        /* ========== Insight Stats ========== */
        .stats-section {
            padding: 72px 0;
            background: var(--bg-secondary);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }

        .stat-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            transition: all 0.3s ease;
        }

        .stat-item:hover {
            border-color: rgba(0, 229, 160, 0.3);
            box-shadow: var(--shadow-card);
            transform: translateY(-2px);
        }

        .stat-item .stat-num {
            font-size: 42px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 8px;
            font-family: "Inter", system-ui, sans-serif;
        }

        .stat-item .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            letter-spacing: 0.02em;
        }

        /* ========== FAQ ========== */
        .faq-section {
            padding: var(--spacing-section) 0;
            background: var(--bg-primary);
        }

        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }

        .accordion {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .accordion-item {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
            border: 1px solid var(--glass-border) !important;
            border-radius: var(--radius-md) !important;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .accordion-item:hover {
            border-color: rgba(255, 255, 255, 0.2);
        }

        .accordion-item:has(.accordion-button:not(.collapsed)) {
            border-color: rgba(0, 229, 160, 0.4) !important;
        }

        .accordion-header {
            margin: 0;
        }

        .accordion-button {
            background: transparent;
            color: var(--text-primary) !important;
            font-size: 16px;
            font-weight: 600;
            padding: 18px 20px;
            box-shadow: none !important;
            border-radius: var(--radius-md) !important;
            transition: color 0.25s ease;
            position: relative;
        }

        .accordion-button::after {
            content: '+';
            background: none !important;
            font-family: var(--font-primary);
            font-size: 20px;
            font-weight: 400;
            color: var(--text-secondary);
            width: auto;
            height: auto;
            margin-left: auto;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.3s ease, color 0.3s ease;
        }

        .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
            color: var(--accent);
        }

        .accordion-button:not(.collapsed) {
            background: rgba(0, 229, 160, 0.05);
            color: var(--accent) !important;
        }

        .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(0, 229, 160, 0.15) !important;
            border-radius: var(--radius-md);
        }

        .accordion-body {
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            margin-top: 4px;
        }

        /* ========== CTA ========== */
        .cta-section {
            padding: 72px 0 96px;
            background: var(--bg-primary);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 700px;
            height: 400px;
            background: radial-gradient(ellipse at center, rgba(0, 229, 160, 0.25), transparent 70%);
            pointer-events: none;
        }

        .cta-card {
            position: relative;
            max-width: 720px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(0, 229, 160, 0.3);
            border-radius: 24px;
            padding: 52px 48px;
            text-align: center;
            box-shadow: 0 0 40px rgba(0, 229, 160, 0.12), var(--shadow-card);
        }

        .cta-card h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .cta-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 28px;
        }

        .cta-card .btn-cta-large {
            background: var(--accent);
            color: var(--bg-primary);
            font-size: 16px;
            font-weight: 600;
            padding: 14px 40px;
            border-radius: var(--radius-sm);
            border: none;
            transition: all 0.25s ease;
            box-shadow: 0 0 24px rgba(0, 229, 160, 0.35);
            display: inline-block;
        }

        .cta-card .btn-cta-large:hover {
            background: var(--accent-hover);
            box-shadow: 0 0 40px rgba(0, 229, 160, 0.5);
            transform: translateY(-2px);
        }

        .cta-card .btn-cta-large:active {
            transform: scale(0.98);
        }

        .cta-card .cta-note {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 18px;
            margin-bottom: 0;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: #081119;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 52px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.8fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            display: inline-block;
        }

        .footer-brand .footer-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 320px;
            margin: 0;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 18px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color 0.25s ease;
        }

        .footer-col ul li a:hover {
            color: var(--accent);
        }

        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-contact-item {
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-contact-item i {
            color: var(--accent);
            font-size: 13px;
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 20px 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer-bottom .copyright {
            font-size: 13px;
            color: var(--text-muted);
        }

        .footer-bottom .footer-icp {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1199px) {
            .resource-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .search-box {
                display: none;
            }
            .navbar-collapse {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--bg-secondary);
                border-bottom: 1px solid var(--glass-border);
                padding: 16px 24px;
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
                box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
            }
            .navbar-nav {
                flex-direction: column;
                width: 100%;
                align-items: flex-start;
                gap: 4px;
            }
            .nav-link {
                display: block;
                width: 100%;
                padding: 10px 12px !important;
            }
            .nav-right {
                width: 100%;
                margin-left: 0;
                justify-content: flex-start;
                gap: 12px;
                margin-top: 8px;
            }
            .nav-cta {
                margin-left: 0;
            }
        }

        @media (max-width: 767px) {
            :root {
                --spacing-section: var(--spacing-section-mobile);
            }
            .category-banner {
                padding: 120px 0 52px;
            }
            .category-banner h1 {
                font-size: 30px;
            }
            .category-banner .banner-desc {
                font-size: 14px;
            }
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .intro-media img {
                height: 220px;
            }
            .resource-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .stat-item {
                padding: 20px 14px;
            }
            .stat-item .stat-num {
                font-size: 32px;
            }
            .cta-card {
                padding: 36px 20px;
                border-radius: 18px;
            }
            .cta-card h2 {
                font-size: 26px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .navbar-logo {
                font-size: 17px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .resource-section .container,
            .category-intro .container,
            .faq-section .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ========== Utility ========== */
        .text-accent {
            color: var(--accent);
        }
        .text-secondary-color {
            color: var(--text-secondary);
        }
        .focus-ring {
            outline: none;
        }
        .focus-ring:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

/* roulang page: category3 */
:root {
            --bg-dark: #0A1520;
            --bg-level2: #0D1B2A;
            --bg-level3: #112030;
            --primary: #0D1B2A;
            --accent: #00E5A0;
            --accent-bright: #2BF2B3;
            --hot: #FF7A45;
            --text-main: #E4EDF5;
            --text-secondary: #8AA3B8;
            --text-muted: #5B7389;
            --glass-bg: rgba(255,255,255,0.05);
            --glass-border: rgba(255,255,255,0.12);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 10px;
            --shadow: 0 8px 32px rgba(0,0,0,0.35);
            --shadow-hover: 0 16px 48px rgba(0,0,0,0.45);
            --transition: 0.25s ease;
            --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--bg-dark);
            color: var(--text-main);
            font-size: 16px;
            line-height: 1.7;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
        }

        a {
            text-decoration: none;
            transition: color 0.25s ease;
        }

        button {
            font-family: inherit;
        }

        .container {
            max-width: 1280px;
            padding-left: 24px;
            padding-right: 24px;
        }

        @media (max-width: 767.98px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        a:focus-visible,
        button:focus-visible,
        .nav-link:focus-visible,
        .accordion-button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 6px;
        }

        /* 公共按钮 */
        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent);
            color: #0A1520 !important;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border: none;
            box-shadow: 0 0 24px rgba(0, 229, 160, 0.35);
            transition: all 0.25s ease;
            cursor: pointer;
            line-height: 1.4;
            gap: 8px;
        }
        .btn-hero-primary:hover {
            background: var(--accent-bright);
            box-shadow: 0 0 36px rgba(0, 229, 160, 0.55);
            color: #0A1520;
            transform: translateY(-1px);
        }
        .btn-hero-primary:active {
            transform: scale(0.98);
        }

        .btn-hero-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: rgba(255,255,255,0.04);
            color: var(--text-main) !important;
            border: 1px solid rgba(255,255,255,0.35);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            transition: all 0.25s ease;
            cursor: pointer;
            line-height: 1.4;
            gap: 8px;
        }
        .btn-hero-secondary:hover {
            background: rgba(255,255,255,0.12);
            border-color: var(--accent);
            color: var(--accent) !important;
            transform: translateY(-1px);
        }
        .btn-hero-secondary:active {
            transform: scale(0.98);
        }

        .btn-lg {
            padding: 16px 42px;
            font-size: 16px;
            border-radius: 12px;
        }

        /* ========== 顶部导航 ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 21, 32, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background 0.3s ease, box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            background: rgba(10, 21, 32, 0.92);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
        }

        .navbar {
            padding: 0;
            min-height: 64px;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: nowrap;
        }

        .navbar-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            text-decoration: none;
            letter-spacing: 0.02em;
            display: flex;
            align-items: center;
            gap: 2px;
            white-space: nowrap;
        }
        .navbar-logo .logo-dot {
            color: var(--accent);
            font-weight: 900;
            margin: 0 3px;
        }
        .navbar-logo:hover {
            color: var(--accent);
        }

        .navbar-toggler {
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 8px;
            padding: 6px 12px;
            color: var(--text-secondary);
            background: rgba(255,255,255,0.05);
            font-size: 16px;
            line-height: 1;
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(0, 229, 160, 0.15);
        }

        .navbar-collapse {
            flex-grow: 0;
        }

        .navbar-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            font-size: 15px;
            padding: 8px 18px !important;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--accent) !important;
            background: rgba(0, 229, 160, 0.08);
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-left: 16px;
        }

        .search-box {
            position: relative;
            width: 200px;
        }
        .search-box input {
            width: 100%;
            height: 36px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.10);
            border-radius: 10px;
            padding: 0 40px 0 32px;
            color: var(--text-main);
            font-size: 13px;
            font-family: var(--font-main);
            outline: none;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .search-box input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 229, 160, 0.15);
        }
        .search-box .fa-search {
            position: absolute;
            left: 12px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 12px;
            color: var(--text-muted);
            pointer-events: none;
        }
        .search-box kbd {
            position: absolute;
            right: 8px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255,255,255,0.08);
            border-radius: 4px;
            font-size: 11px;
            font-family: var(--font-main);
            padding: 2px 6px;
            color: var(--text-secondary);
            pointer-events: none;
        }

        .nav-cta {
            padding: 9px 20px;
            font-size: 14px;
        }

        @media (max-width: 991.98px) {
            .nav-wrapper {
                flex-wrap: wrap;
            }
            .navbar-collapse {
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(10, 21, 32, 0.96);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                padding: 20px 24px;
                border-bottom: 1px solid rgba(255,255,255,0.06);
                box-shadow: 0 16px 48px rgba(0,0,0,0.45);
            }
            .navbar-nav {
                flex-direction: column !important;
                align-items: flex-start;
                gap: 4px;
                width: 100%;
            }
            .nav-link {
                display: block;
                width: 100%;
                padding: 10px 12px !important;
            }
            .nav-right {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
                margin-left: 0;
                margin-top: 14px;
                width: 100%;
            }
            .search-box {
                width: 100%;
            }
            .nav-cta {
                width: 100%;
            }
        }

        @media (max-width: 767.98px) {
            .navbar-logo {
                font-size: 17px;
            }
        }

        /* ========== Hero / 页面横幅 ========== */
        .page-hero {
            position: relative;
            padding: 140px 0 80px;
            background: linear-gradient(135deg, #0D1B2A 0%, #122C42 100%);
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.28;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10,21,32,0.4) 0%, rgba(10,21,32,0.85) 100%);
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
        }

        .hero-grid-overlay {
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
            background-size: 48px 48px;
            z-index: 0;
            pointer-events: none;
        }
        .page-hero .container {
            z-index: 2;
        }

        .breadcrumb-hero {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .breadcrumb-hero a {
            color: var(--text-secondary);
        }
        .breadcrumb-hero a:hover {
            color: var(--accent);
        }

        .page-title {
            font-size: 46px;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.2;
            margin-bottom: 16px;
            max-width: 860px;
            letter-spacing: 0.01em;
        }
        .page-title .highlight {
            color: var(--accent);
        }
        .hero-line {
            display: inline-block;
            width: 40px;
            height: 4px;
            background: var(--accent);
            border-radius: 2px;
            margin-bottom: 20px;
        }
        .page-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        @media (max-width: 767.98px) {
            .page-hero {
                padding: 110px 0 56px;
            }
            .page-title {
                font-size: 30px;
            }
            .page-subtitle {
                font-size: 16px;
            }
            .hero-actions .btn {
                width: 100%;
            }
        }

        /* ========== 区块通用 ========== */
        .section {
            padding: 96px 0;
        }
        @media (max-width: 991.98px) {
            .section {
                padding: 72px 0;
            }
        }
        @media (max-width: 767.98px) {
            .section {
                padding: 48px 0;
            }
        }

        .section-header {
            margin-bottom: 48px;
        }
        .section-header.text-center {
            text-align: center;
        }
        .section-tag {
            display: inline-block;
            background: rgba(0, 229, 160, 0.12);
            color: var(--accent);
            font-size: 12px;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 999px;
            letter-spacing: 0.04em;
            margin-bottom: 16px;
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }
        .section-header.text-center .section-desc {
            margin: 0 auto;
        }

        @media (max-width: 767.98px) {
            .section-title {
                font-size: 24px;
            }
            .section-desc {
                font-size: 15px;
            }
        }

        /* ========== 分类导语区 ========== */
        .section-intro {
            background: var(--bg-level2);
        }
        .intro-grid {
            align-items: center;
            row-gap: 32px;
        }
        .intro-media {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: var(--bg-level3);
        }
        .intro-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            min-height: 320px;
        }
        .intro-media::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 55%, rgba(10,21,32,0.5));
        }
        .intro-media-badge {
            position: absolute;
            left: 16px;
            bottom: 16px;
            z-index: 2;
            background: rgba(0, 229, 160, 0.92);
            color: #0A1520;
            font-size: 13px;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 999px;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
        }

        .intro-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .intro-item {
            display: flex;
            gap: 18px;
            padding: 22px 24px;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
        }
        .intro-item:hover {
            border-color: rgba(0, 229, 160, 0.5);
            background: rgba(255,255,255,0.07);
            transform: translateY(-2px);
        }
        .intro-item > i {
            font-size: 22px;
            color: var(--accent);
            margin-top: 3px;
            flex-shrink: 0;
        }
        .intro-item h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 6px;
        }
        .intro-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        /* ========== 核心功能卡 ========== */
        .section-functions {
            background: var(--bg-dark);
        }
        .function-grid {
            row-gap: 24px;
        }
        .function-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 4px 20px rgba(0,0,0,0.2);
        }
        .function-card:hover {
            transform: translateY(-6px);
            border-color: rgba(0, 229, 160, 0.4);
            box-shadow: var(--shadow-hover);
        }
        .function-card-cover {
            position: relative;
            height: 170px;
            overflow: hidden;
            flex-shrink: 0;
        }
        .function-card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform 0.5s ease;
        }
        .function-card:hover .function-card-cover img {
            transform: scale(1.04);
        }
        .function-card-cover::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10,21,32,0) 40%, rgba(10,21,32,0.55) 100%);
        }
        .badge-tag {
            position: absolute;
            top: 14px;
            right: 14px;
            background: rgba(0, 229, 160, 0.92);
            color: #0A1520;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            z-index: 2;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
        }
        .function-card-body {
            padding: 24px;
            flex: 1;
        }
        .function-card-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .function-card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        @media (max-width: 767.98px) {
            .function-card-cover {
                height: 150px;
            }
            .function-card-body {
                padding: 18px;
            }
        }

        /* ========== 优势对比条 ========== */
        .section-advantages {
            background: var(--bg-level2);
            border-top: 1px solid rgba(255,255,255,0.04);
            border-bottom: 1px solid rgba(255,255,255,0.04);
        }
        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .advantage-item {
            text-align: center;
            padding: 32px 16px;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            transition: border-color 0.3s ease, transform 0.3s ease;
        }
        .advantage-item:hover {
            border-color: rgba(0, 229, 160, 0.35);
            transform: translateY(-3px);
        }
        .advantage-number {
            font-size: 40px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 6px;
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        .advantage-label {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 4px;
        }
        .advantage-desc {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        @media (max-width: 1199.98px) {
            .advantage-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 575.98px) {
            .advantage-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== FAQ ========== */
        .section-faq {
            background: var(--bg-dark);
        }
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }
        .accordion-item {
            background: var(--glass-bg) !important;
            border: 1px solid var(--glass-border) !important;
            border-radius: var(--radius-md) !important;
            margin-bottom: 12px;
            overflow: hidden;
        }
        .accordion-button {
            background: transparent !important;
            color: var(--text-main) !important;
            box-shadow: none !important;
            font-size: 15px;
            font-weight: 600;
            padding: 18px 22px;
            transition: color 0.25s ease, background 0.25s ease;
        }
        .accordion-button::after {
            filter: brightness(0) invert(1) opacity(0.6);
            transition: transform 0.3s ease, filter 0.3s ease;
        }
        .accordion-button:not(.collapsed) {
            background: rgba(0, 229, 160, 0.06) !important;
            color: var(--accent) !important;
            border-bottom: 1px solid rgba(0, 229, 160, 0.15) !important;
        }
        .accordion-button:not(.collapsed)::after {
            filter: brightness(0) invert(1) sepia(1) saturate(5) hue-rotate(90deg);
            transform: rotate(180deg);
        }
        .accordion-button:hover {
            color: var(--accent) !important;
        }
        .accordion-body {
            padding: 18px 22px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.8;
            background: transparent;
        }

        @media (max-width: 767.98px) {
            .accordion-button {
                font-size: 14px;
                padding: 16px 18px;
            }
            .accordion-body {
                padding: 14px 18px;
                font-size: 13px;
            }
        }

        /* ========== CTA ========== */
        .section-cta {
            position: relative;
            background: var(--bg-level2);
            overflow: hidden;
        }
        .section-cta::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 50%;
            width: 70%;
            height: 300px;
            transform: translate(-50%, -50%);
            background: radial-gradient(ellipse, rgba(0, 229, 160, 0.14) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-card {
            position: relative;
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(0, 229, 160, 0.30);
            border-radius: 24px;
            padding: 64px 48px;
            text-align: center;
            box-shadow: 0 0 48px rgba(0, 229, 160, 0.08);
        }
        .cta-card h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .cta-card > p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.8;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        .cta-note {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 0 !important;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .cta-note i {
            color: var(--accent);
        }

        @media (max-width: 767.98px) {
            .cta-card {
                padding: 40px 20px;
                border-radius: 16px;
            }
            .cta-card h2 {
                font-size: 24px;
            }
            .cta-card > p {
                font-size: 15px;
            }
            .cta-buttons .btn {
                width: 100%;
            }
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: #081119;
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 64px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            padding-bottom: 48px;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 2px;
            margin-bottom: 16px;
        }
        .footer-logo .logo-dot {
            color: var(--accent);
            font-weight: 900;
            margin: 0 3px;
        }
        .footer-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 360px;
            margin: 0;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 20px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul a {
            color: var(--text-secondary);
            font-size: 14px;
            transition: color 0.25s ease, padding-left 0.25s ease;
        }
        .footer-col ul a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.6;
        }
        .footer-contact-item i {
            color: var(--accent);
            font-size: 14px;
            width: 16px;
            text-align: center;
            flex-shrink: 0;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }
        .copyright {
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-icp {
            font-size: 12px;
            color: var(--text-muted);
        }

        @media (max-width: 991.98px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 575.98px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }