/* roulang page: index */
:root {
            --bg-primary: #070B14;
            --bg-secondary: #0C1222;
            --brand-primary: #0066FF;
            --brand-secondary: #00D2FF;
            --brand-neon: #00F0FF;
            --text-main: #FFFFFF;
            --text-secondary: #E2E8F0;
            --text-body: #94A3B8;
            --text-weak: #64748B;
            --border-glow: rgba(0, 210, 255, 0.15);
            --border-subtle: rgba(255, 255, 255, 0.08);
            --card-glass: rgba(15, 23, 42, 0.65);
            --radius-md: 12px;
            --radius-lg: 18px;
            --shadow-neon: 0 0 25px rgba(0, 210, 255, 0.45);
        }

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

        html {
            background-color: var(--bg-primary);
            color: var(--text-body);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.65;
            overflow-x: hidden;
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-body);
            overflow-x: hidden;
            min-height: 100vh;
            selection-background-color: var(--brand-primary);
            selection-color: #ffffff;
        }

        .site-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* Section Padding & Alternating Backgrounds */
        .section-block {
            padding: 96px 0;
            position: relative;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .section-bg-primary {
            background-color: var(--bg-primary);
        }

        .section-bg-secondary {
            background-color: var(--bg-secondary);
        }

        /* Glassmorphism Card System */
        .glass-card {
            background: var(--card-glass);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
            position: relative;
            overflow: hidden;
        }

        .glass-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 210, 255, 0.35), transparent);
            opacity: 0.6;
        }

        .glass-card:hover {
            border-color: rgba(0, 240, 255, 0.45);
            box-shadow: 0 12px 36px -8px rgba(0, 0, 0, 0.65), 0 0 22px rgba(0, 210, 255, 0.18);
            transform: translateY(-4px);
        }

        /* Scenario Lift Card */
        .scenario-card {
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.78) 0%, rgba(7, 11, 20, 0.92) 100%);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(0, 210, 255, 0.15);
            border-radius: var(--radius-lg);
            transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
        }

        .scenario-card:hover {
            transform: translateY(-10px);
            border-color: var(--brand-neon);
            box-shadow: 0 18px 40px rgba(0, 102, 255, 0.25), 0 0 25px rgba(0, 240, 255, 0.35);
        }

        /* Buttons */
        .btn-glow {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            min-height: 48px;
            padding: 12px 28px;
            background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
            color: #FFFFFF;
            font-weight: 600;
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.3s ease;
            cursor: pointer;
            text-decoration: none;
            box-shadow: 0 4px 18px rgba(0, 102, 255, 0.35);
        }

        .btn-glow:hover, .btn-glow:focus {
            box-shadow: var(--shadow-neon);
            border-color: var(--brand-neon);
            transform: translateY(-2px);
            color: #FFFFFF;
        }

        .btn-outline-cyber {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            min-height: 48px;
            padding: 12px 26px;
            background: rgba(0, 210, 255, 0.06);
            color: var(--text-secondary);
            font-weight: 600;
            border-radius: 10px;
            border: 1px solid rgba(0, 210, 255, 0.35);
            transition: all 0.3s ease;
            cursor: pointer;
            text-decoration: none;
        }

        .btn-outline-cyber:hover, .btn-outline-cyber:focus {
            background: rgba(0, 210, 255, 0.16);
            border-color: var(--brand-neon);
            color: #FFFFFF;
            box-shadow: 0 0 20px rgba(0, 210, 255, 0.3);
        }

        /* Gradient Typography */
        .text-gradient-cyan {
            background: linear-gradient(90deg, #FFFFFF 0%, #7CE7FF 50%, #00D2FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .metric-number {
            background: linear-gradient(135deg, #00F0FF 0%, #0066FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 35px rgba(0, 240, 255, 0.35);
        }

        /* Header Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(7, 11, 20, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 210, 255, 0.15);
        }

        .nav-link {
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.25s ease;
            position: relative;
            white-space: nowrap;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--brand-neon);
            background: rgba(0, 210, 255, 0.08);
        }

        /* Voucher / Grant Ticket Styling */
        .voucher-ticket {
            background: linear-gradient(135deg, rgba(0, 102, 255, 0.22) 0%, rgba(15, 23, 42, 0.9) 60%, rgba(0, 210, 255, 0.18) 100%);
            border: 1px solid rgba(0, 240, 255, 0.4);
            border-radius: 16px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5), inset 0 0 25px rgba(0, 210, 255, 0.12);
        }

        .voucher-ticket::after {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.12) 0%, transparent 60%);
            pointer-events: none;
        }

        /* Tech Architecture Tree */
        .arch-node {
            position: relative;
            padding-left: 28px;
            border-left: 2px solid rgba(0, 210, 255, 0.35);
        }

        .arch-node::before {
            content: '';
            position: absolute;
            left: -7px;
            top: 6px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--brand-neon);
            box-shadow: 0 0 12px var(--brand-neon);
        }

        /* Form Controls */
        .cyber-input {
            width: 100%;
            min-height: 48px;
            background: rgba(7, 11, 20, 0.8);
            border: 1px solid rgba(0, 210, 255, 0.22);
            border-radius: 10px;
            padding: 12px 16px;
            color: #FFFFFF;
            font-size: 0.95rem;
            transition: all 0.25s ease;
        }

        .cyber-input:focus {
            outline: none;
            border-color: var(--brand-neon);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
            background: rgba(12, 18, 34, 0.95);
        }

        /* FAQ Accordion */
        .faq-item[open] {
            border-color: rgba(0, 240, 255, 0.45);
            box-shadow: 0 0 25px rgba(0, 210, 255, 0.12);
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .section-block {
                padding: 72px 0;
            }
        }

        @media (max-width: 768px) {
            .section-block {
                padding: 56px 0;
            }
            .site-container {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .section-block {
                padding: 48px 0;
            }
            .btn-glow, .btn-outline-cyber {
                width: 100%;
                padding: 12px 18px;
            }
        }