/* roulang page: index */
:root {
            --bg-base: #0B0E14;
            --bg-surface: #12161F;
            --bg-surface-elevated: #1A202C;
            --gold-primary: #E5B869;
            --gold-secondary: #D49A3D;
            --gold-glow: rgba(229, 184, 105, 0.25);
            --steel-blue: #4C627A;
            --text-pure: #FFFFFF;
            --text-body: #E2E8F0;
            --text-muted: #8A96A6;
            --border-dim: rgba(255, 255, 255, 0.08);
            --border-highlight: rgba(229, 184, 105, 0.4);
            --radius-sm: 4px;
            --radius-md: 6px;
            --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Inter", sans-serif;
            --font-mono: "Oswald", "Consolas", monospace;
        }

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

        body {
            background-color: var(--bg-base);
            color: var(--text-body);
            font-family: var(--font-stack);
            font-size: 15px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            padding-bottom: 70px;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-pure);
            font-weight: 700;
            letter-spacing: -0.5px;
            line-height: 1.25;
        }

        a {
            color: var(--gold-primary);
            text-decoration: none;
            transition: all 0.2s ease-in-out;
        }
        a:hover {
            color: #ffcf78;
        }

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

        /* Top Utility Bar */
        .utility-bar {
            background-color: #06080B;
            border-bottom: 1px solid var(--border-dim);
            font-size: 12px;
            color: var(--text-muted);
            padding: 6px 0;
        }

        /* Custom Main Navbar */
        .navbar-custom {
            background-color: rgba(11, 14, 20, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-dim);
            padding: 12px 0;
        }
        .navbar-brand {
            font-size: 18px;
            font-weight: 800;
            color: var(--text-pure) !important;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: 0.5px;
        }
        .navbar-brand i {
            color: var(--gold-primary);
            font-size: 20px;
        }
        .nav-link {
            color: var(--text-body) !important;
            font-weight: 500;
            font-size: 14px;
            padding: 8px 14px !important;
            transition: color 0.2s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--gold-primary) !important;
        }

        /* Custom Buttons */
        .btn-gold {
            background-color: var(--gold-primary);
            color: #0B0E14 !important;
            font-weight: 700;
            font-size: 14px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--gold-primary);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn-gold:hover {
            background-color: var(--gold-secondary);
            border-color: var(--gold-secondary);
            box-shadow: 0 0 16px var(--gold-glow);
            transform: translateY(-1px);
        }
        .btn-outline-gold {
            background-color: transparent;
            color: var(--gold-primary) !important;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--gold-primary);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn-outline-gold:hover {
            background-color: rgba(229, 184, 105, 0.1);
            color: #fff !important;
            border-color: #ffcf78;
        }

        /* Section Layouts */
        .section-padding {
            padding: 84px 0;
            border-bottom: 1px solid var(--border-dim);
            position: relative;
        }
        .section-alt {
            background-color: var(--bg-surface);
        }
        .section-header {
            margin-bottom: 48px;
        }
        .badge-sub {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            color: var(--gold-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
            padding: 3px 8px;
            background: rgba(229, 184, 105, 0.12);
            border: 1px solid rgba(229, 184, 105, 0.3);
            border-radius: var(--radius-sm);
        }

        /* Cards */
        .system-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 24px;
            height: 100%;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            position: relative;
            overflow: hidden;
        }
        .system-card:hover {
            border-color: var(--border-highlight);
            transform: translateY(-3px);
            box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
        }
        .system-card .card-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: rgba(229, 184, 105, 0.1);
            color: var(--gold-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 16px;
        }

        /* Hero */
        .hero-banner {
            padding: 100px 0 80px;
            background: radial-gradient(circle at 75% 30%, rgba(229, 184, 105, 0.08) 0%, rgba(11, 14, 20, 0.98) 70%), url('/assets/images/930f7574b9fc42bb.webp') center/cover no-repeat;
            border-bottom: 1px solid var(--border-dim);
            position: relative;
        }
        .hero-title {
            font-size: 46px;
            font-weight: 800;
            line-height: 1.18;
            margin-bottom: 20px;
        }
        .hero-meta-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(76, 98, 122, 0.25);
            border: 1px solid var(--steel-blue);
            color: #A3BFDB;
            padding: 4px 12px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            margin-bottom: 18px;
        }

        /* Metrics */
        .metric-block {
            border-right: 1px solid var(--border-dim);
            padding: 20px 24px;
            text-align: left;
        }
        .metric-block:last-child {
            border-right: none;
        }
        .metric-num {
            font-family: var(--font-mono);
            font-size: 42px;
            font-weight: 700;
            color: var(--gold-primary);
            line-height: 1;
            margin-bottom: 6px;
        }

        /* Comparison Table */
        .comparison-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-surface);
        }
        .comparison-table th, .comparison-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-dim);
            font-size: 14px;
        }
        .comparison-table th {
            background-color: #0E1219;
            color: var(--text-pure);
            font-weight: 700;
        }
        .comparison-table tr:last-child td {
            border-bottom: none;
        }
        .comparison-table .highlight-col {
            background: rgba(229, 184, 105, 0.05);
            color: var(--gold-primary);
            font-weight: 600;
            border-left: 1px solid rgba(229, 184, 105, 0.2);
            border-right: 1px solid rgba(229, 184, 105, 0.2);
        }

        /* Accordion */
        .accordion-item {
            background-color: var(--bg-surface);
            border: 1px solid var(--border-dim);
            margin-bottom: 10px;
            border-radius: var(--radius-sm) !important;
            overflow: hidden;
        }
        .accordion-button {
            background-color: var(--bg-surface);
            color: var(--text-pure);
            font-weight: 600;
            padding: 18px 24px;
            box-shadow: none !important;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(229, 184, 105, 0.08);
            color: var(--gold-primary);
            border-bottom: 1px solid var(--border-dim);
        }
        .accordion-button::after {
            filter: invert(0.8);
        }
        .accordion-body {
            background-color: #10141D;
            color: var(--text-body);
            padding: 20px 24px;
            font-size: 14px;
            line-height: 1.8;
        }

        /* Form Controls */
        .form-control, .form-select {
            background-color: #0E121A;
            border: 1px solid var(--border-dim);
            color: #fff;
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            font-size: 14px;
        }
        .form-control:focus, .form-select:focus {
            background-color: #0E121A;
            border-color: var(--gold-primary);
            color: #fff;
            box-shadow: 0 0 0 3px rgba(229, 184, 105, 0.15);
        }

        /* Sticky Conversion Bar */
        .sticky-action-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: rgba(14, 18, 25, 0.98);
            backdrop-filter: blur(8px);
            border-top: 1px solid rgba(229, 184, 105, 0.3);
            z-index: 1040;
            padding: 12px 0;
            box-shadow: 0 -8px 20px rgba(0,0,0,0.4);
        }

        /* Footer */
        .site-footer {
            background-color: #06080B;
            border-top: 1px solid var(--border-dim);
            padding: 60px 0 30px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .site-footer h5 {
            font-size: 15px;
            margin-bottom: 18px;
            color: var(--text-pure);
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
        }
        .site-footer ul li {
            margin-bottom: 8px;
        }
        .site-footer ul li a {
            color: var(--text-muted);
        }
        .site-footer ul li a:hover {
            color: var(--gold-primary);
        }

        @media (max-width: 991px) {
            .hero-title { font-size: 34px; }
            .metric-block { border-right: none; border-bottom: 1px solid var(--border-dim); }
            .metric-block:last-child { border-bottom: none; }
            .section-padding { padding: 56px 0; }
        }