/* roulang page: index */
:root {
            --bg-base: #080C16;
            --bg-card: rgba(18, 26, 47, 0.72);
            --bg-card-hover: rgba(24, 35, 62, 0.88);
            --border-glow: rgba(0, 210, 255, 0.18);
            --border-highlight: rgba(0, 245, 212, 0.45);
            --primary-blue: #0066FF;
            --electric-cyan: #00D2FF;
            --neon-green: #00F5D4;
            --text-main: #FFFFFF;
            --text-muted: #8F9CA9;
            --text-sub: #BAC7D5;
            --radius-lg: 16px;
            --radius-sm: 8px;
            --glow-shadow: 0 0 25px rgba(0, 102, 255, 0.35);
        }

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

        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.65;
            letter-spacing: 0.3px;
            overflow-x: hidden;
            background-image: 
                radial-gradient(circle at 15% 15%, rgba(11, 19, 43, 0.8) 0%, transparent 45%),
                radial-gradient(circle at 85% 65%, rgba(28, 37, 65, 0.6) 0%, transparent 50%);
            background-attachment: fixed;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        /* Top Bar & Navigation */
        .top-meta-bar {
            background: rgba(8, 12, 22, 0.95);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 13px;
            color: var(--text-muted);
            padding: 6px 0;
        }

        .main-header {
            background: rgba(11, 19, 43, 0.85);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-glow);
            position: sticky;
            top: 0;
            z-index: 1020;
        }

        .navbar-brand {
            font-weight: 700;
            font-size: 22px;
            color: #fff !important;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .brand-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--primary-blue), var(--electric-cyan));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            box-shadow: 0 0 12px rgba(0, 210, 255, 0.5);
        }

        .nav-link {
            color: var(--text-sub) !important;
            font-size: 15px;
            font-weight: 500;
            padding: 8px 16px !important;
            transition: color 0.25s ease;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--electric-cyan) !important;
        }

        /* Breadcrumb Enhanced Bar */
        .nav-breadcrumb-strip {
            background: rgba(18, 26, 47, 0.5);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            padding: 6px 0;
            font-size: 13px;
        }

        /* Buttons & Badges */
        .btn-glow {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--electric-cyan) 100%);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            padding: 10px 24px;
            font-weight: 600;
            box-shadow: 0 0 15px rgba(0, 102, 255, 0.4);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-glow:hover {
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 0 25px rgba(0, 210, 255, 0.75);
        }

        .btn-outline-glow {
            background: transparent;
            color: var(--electric-cyan);
            border: 1px solid var(--electric-cyan);
            border-radius: var(--radius-sm);
            padding: 10px 24px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .btn-outline-glow:hover {
            background: rgba(0, 210, 255, 0.12);
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 210, 255, 0.4);
            transform: translateY(-2px);
        }

        .badge-cyan {
            background: rgba(0, 245, 212, 0.12);
            border: 1px solid var(--neon-green);
            color: var(--neon-green);
            padding: 4px 10px;
            font-size: 12px;
            border-radius: 4px;
            font-weight: 500;
        }

        /* Card System (Glassmorphic) */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            border: 1px solid var(--border-glow);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-lg);
            padding: 28px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            height: 100%;
            position: relative;
            overflow: hidden;
        }

        .glass-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 210, 255, 0.4);
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.15);
        }

        .glass-card.highlight {
            border: 1px solid var(--border-highlight);
            box-shadow: 0 0 20px rgba(0, 245, 212, 0.15);
        }

        /* Section Commons */
        .section-block {
            padding: 85px 0;
            position: relative;
        }

        .section-block.alt-bg {
            background: rgba(14, 22, 40, 0.55);
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .section-header {
            margin-bottom: 45px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .section-lead {
            font-size: 16px;
            color: var(--text-sub);
            max-width: 820px;
            line-height: 1.7;
        }

        /* Hero */
        .hero-section {
            padding: 80px 0 100px;
            background: linear-gradient(180deg, rgba(8, 12, 22, 0.4) 0%, rgba(8, 12, 22, 0.95) 100%),
                        url('/assets/images/b7c0f64c90265806.jpg') center/cover no-repeat;
            position: relative;
        }

        .hero-title {
            font-size: 46px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 24px;
            background: linear-gradient(120deg, #FFFFFF 60%, var(--electric-cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 17px;
            color: var(--text-sub);
            margin-bottom: 32px;
            line-height: 1.75;
        }

        .hero-stat-card {
            background: rgba(11, 19, 43, 0.75);
            border: 1px solid var(--border-glow);
            backdrop-filter: blur(12px);
            border-radius: var(--radius-lg);
            padding: 24px;
        }

        /* Metric Bar */
        .metric-banner {
            background: rgba(18, 26, 47, 0.85);
            border-top: 1px solid var(--border-glow);
            border-bottom: 1px solid var(--border-glow);
            padding: 40px 0;
        }

        .metric-num {
            font-size: 38px;
            font-weight: 800;
            color: var(--electric-cyan);
            font-family: Arial, sans-serif;
            margin-bottom: 4px;
        }

        /* Accordion Custom */
        .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            margin-bottom: 16px;
            border-radius: var(--radius-sm) !important;
            overflow: hidden;
        }

        .accordion-button {
            background: var(--bg-card);
            color: #fff;
            font-size: 17px;
            font-weight: 600;
            box-shadow: none !important;
            padding: 20px 24px;
        }

        .accordion-button:not(.collapsed) {
            background: rgba(0, 102, 255, 0.15);
            color: var(--electric-cyan);
        }

        .accordion-button::after {
            filter: invert(1);
        }

        .accordion-body {
            background: rgba(11, 19, 43, 0.6);
            color: var(--text-sub);
            padding: 20px 24px;
            font-size: 15px;
            line-height: 1.75;
        }

        /* Partner Grid */
        .partner-box {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: var(--radius-sm);
            padding: 20px;
            text-align: center;
            font-weight: 500;
            color: var(--text-muted);
            transition: all 0.3s;
        }

        .partner-box:hover {
            border-color: var(--electric-cyan);
            color: #fff;
            background: rgba(0, 210, 255, 0.05);
        }

        /* CTA Box */
        .cta-container-card {
            background: radial-gradient(circle at top right, rgba(0, 210, 255, 0.25), transparent 70%),
                        linear-gradient(135deg, rgba(18, 26, 47, 0.95), rgba(8, 12, 22, 0.98));
            border: 1px solid var(--border-highlight);
            border-radius: 20px;
            padding: 50px 40px;
            box-shadow: 0 0 35px rgba(0, 102, 255, 0.25);
        }

        /* Footer */
        footer {
            background: #04060B;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 60px 0 30px;
            color: var(--text-muted);
            font-size: 14px;
        }

        footer h5 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        footer ul {
            list-style: none;
            padding-left: 0;
        }

        footer ul li {
            margin-bottom: 10px;
        }

        footer ul li a:hover {
            color: var(--electric-cyan);
        }

        @media (max-width: 991px) {
            .hero-title { font-size: 34px; }
            .section-title { font-size: 26px; }
            .section-block { padding: 60px 0; }
        }