/* roulang page: index */
:root {
            --primary-cyan: #00E5FF;
            --accent-gold: #F0B90B;
            --bg-deep: #0B0E17;
            --surface-glass: rgba(18, 25, 40, 0.75);
            --text-primary: #FFFFFF;
            --text-secondary: #B0C4DE;
            --text-muted: #6B7B8D;
            --border-glow: rgba(0, 229, 255, 0.15);
            --radius-lg: 20px;
            --radius-btn: 50px;
            --shadow-glow: 0 0 18px rgba(0, 229, 255, 0.6);
            --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            background-color: var(--bg-deep);
            color: var(--text-secondary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            letter-spacing: 0.01em;
        }

        /* 自定义玻璃拟态卡片 */
        .glass-card {
            background: var(--surface-glass);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
            transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
        }

        .glass-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 229, 255, 0.4);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
        }

        /* 发光按钮 */
        .btn-glow {
            background: var(--primary-cyan);
            color: #0B0E17;
            font-weight: 600;
            border-radius: var(--radius-btn);
            padding: 0.875rem 2.25rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-smooth);
            box-shadow: 0 4px 15px rgba(0, 229, 255, 0.3);
            border: none;
            cursor: pointer;
            letter-spacing: 0.02em;
        }

        .btn-glow:hover {
            background: #00f0ff;
            box-shadow: var(--shadow-glow);
            transform: scale(1.02);
            color: #000;
        }

        .btn-outline-glow {
            background: transparent;
            border: 1.5px solid var(--primary-cyan);
            color: var(--primary-cyan);
            font-weight: 600;
            border-radius: var(--radius-btn);
            padding: 0.875rem 2.25rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-smooth);
            cursor: pointer;
            letter-spacing: 0.02em;
        }

        .btn-outline-glow:hover {
            background: rgba(0, 229, 255, 0.15);
            border-color: #00f0ff;
            color: #fff;
            box-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
        }

        /* 搜索框样式 */
        .search-input {
            background: rgba(18, 25, 40, 0.75);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(0, 229, 255, 0.2);
            border-radius: 40px;
            padding: 0.75rem 1.25rem 0.75rem 3rem;
            color: #fff;
            width: 100%;
            transition: all var(--transition-smooth);
            outline: none;
        }

        .search-input::placeholder {
            color: var(--text-muted);
            font-weight: 300;
        }

        .search-input:focus {
            border-color: var(--primary-cyan);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
            background: rgba(20, 28, 45, 0.9);
        }

        .search-icon {
            position: absolute;
            left: 1.25rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--primary-cyan);
            font-size: 1.2rem;
        }

        /* 手风琴动画 */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease-in-out, padding 0.3s;
            padding: 0 1.5rem;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 1rem 1.5rem 1.5rem;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        .faq-icon {
            transition: transform 0.3s ease;
            font-size: 1.5rem;
            color: var(--primary-cyan);
        }

        /* 导航链接 */
        .nav-link {
            color: var(--text-secondary);
            transition: color var(--transition-smooth);
            font-weight: 500;
            position: relative;
        }

        .nav-link:hover {
            color: var(--primary-cyan);
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-cyan);
            transition: width var(--transition-smooth);
        }

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

        /* 自定义滚动条 */
        ::-webkit-scrollbar {
            width: 8px;
        }

        ::-webkit-scrollbar-track {
            background: #0a0d14;
        }

        ::-webkit-scrollbar-thumb {
            background: #2a3548;
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary-cyan);
        }

        /* 汉堡菜单动画 */
        .mobile-menu {
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        @media (max-width: 768px) {
            .glass-card {
                border-radius: 16px;
            }
            h1 {
                font-size: 2.25rem !important;
            }
            h2 {
                font-size: 1.8rem !important;
            }
        }