/* roulang page: index */
:root {
            --primary-wafer: #0F1F38;
            --primary-dark: #090D16;
            --accent-cyan: #00B4D8;
            --accent-teal: #06D6A0;
            --bg-light: #F8FAFC;
            --text-dark: #1E293B;
            --text-muted: #475569;
            --border-soft: #E2E8F0;
            --card-shadow: 0 10px 30px -10px rgba(15, 31, 56, 0.08);
            --glow-shadow: 0 0 25px rgba(0, 180, 216, 0.15);
        }

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

        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(9, 13, 22, 0.95) 0%, rgba(15, 31, 56, 0.92) 55%, rgba(0, 180, 216, 0.8) 100%);
        }

        .dark-wafer-bg {
            background: radial-gradient(circle at 80% 20%, #162C4E 0%, #090D16 80%);
        }

        .badge-pill {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.85rem;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 9999px;
            background: rgba(0, 180, 216, 0.1);
            color: #0284C7;
            border: 1px solid rgba(0, 180, 216, 0.25);
        }

        .badge-pill-dark {
            background: rgba(6, 214, 160, 0.12);
            color: #06D6A0;
            border: 1px solid rgba(6, 214, 160, 0.3);
        }

        .card-hover-effect {
            transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-hover-effect:hover {
            transform: translateY(-4px);
            box-shadow: 0 18px 36px -10px rgba(15, 31, 56, 0.14);
            border-color: rgba(0, 180, 216, 0.4);
        }

        .glass-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(226, 232, 240, 0.9);
        }

        .glass-card-dark {
            background: rgba(22, 35, 59, 0.85);
            backdrop-filter: blur(14px);
            border: 1px solid rgba(0, 180, 216, 0.2);
        }

        .faq-content {
            transition: max-height 0.3s ease-out, opacity 0.25s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }

        .faq-content.open {
            max-height: 380px;
            opacity: 1;
        }

        /* 隐藏移动抽屉初始状态 */
        #mobile-menu {
            transition: transform 0.3s ease-in-out;
        }
        #mobile-menu.closed {
            transform: translateX(100%);
        }