/* roulang page: index */
:root {
            --primary: #4338CA;
            --primary-dark: #1E1B4B;
            --accent-cyan: #06B6D4;
            --accent-green: #10B981;
            --accent-amber: #F59E0B;
            --bg-page: #F8FAFC;
            --surface-card: #FFFFFF;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-light: rgba(226, 232, 240, 0.8);
            --shadow-subtle: 0 10px 30px -10px rgba(67, 56, 202, 0.08);
            --shadow-glow: 0 15px 35px -5px rgba(6, 182, 212, 0.2);
            --radius-card: 1.5rem;
        }

        body {
            font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-page);
            color: var(--text-main);
            overflow-x: hidden;
            line-height: 1.7;
        }

        .brand-gradient-text {
            background: linear-gradient(135deg, #06B6D4 0%, #4F46E5 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .brand-gradient-bg {
            background: linear-gradient(135deg, #06B6D4 0%, #4338CA 100%);
        }

        .brand-gradient-border {
            border-image: linear-gradient(135deg, #06B6D4, #4338CA) 1;
        }

        .badge-pill {
            display: inline-flex;
            align-items: center;
            padding: 0.35rem 0.9rem;
            border-radius: 9999px;
            font-size: 0.825rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            border: 1px solid rgba(99, 102, 241, 0.2);
            background: rgba(238, 242, 255, 0.85);
            backdrop-filter: blur(8px);
        }

        .card-custom {
            background-color: var(--surface-card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-subtle);
            transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-custom:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 35px -10px rgba(67, 56, 202, 0.12);
            border-color: rgba(99, 102, 241, 0.35);
        }

        .dark-card-custom {
            background: rgba(30, 41, 59, 0.7);
            border-radius: var(--radius-card);
            border: 1px solid rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(12px);
            transition: all 0.3s ease;
        }

        .dark-card-custom:hover {
            border-color: rgba(6, 182, 212, 0.5);
            box-shadow: 0 10px 30px -10px rgba(6, 182, 212, 0.25);
        }

        /* 终端代码模拟框 */
        .terminal-header {
            background: #1e293b;
            border-top-left-radius: 1rem;
            border-top-right-radius: 1rem;
            padding: 0.75rem 1.25rem;
            display: flex;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .terminal-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            margin-right: 8px;
            display: inline-block;
        }

        /* 手风琴平滑动效 */
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, opacity 0.3s ease;
            opacity: 0;
        }

        .faq-item.active .faq-content {
            max-height: 500px;
            opacity: 1;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: #4F46E5;
        }

        /* 自定义滚动条 */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #f1f5f9;
        }
        ::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #94a3b8;
        }