/* roulang page: index */
:root {
            --color-primary: #4F46E5;
            --color-primary-hover: #4338CA;
            --color-accent: #F59E0B;
            --color-bg-base: #FFFFFF;
            --color-bg-alt: #F8FAFC;
            --color-slate-dark: #0F172A;
            --color-text-main: #1E293B;
            --color-text-sub: #64748B;
            --color-border: #E2E8F0;
            --radius-md: 0.75rem;
            --radius-lg: 1.25rem;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-elevated: 0 12px 32px -4px rgba(79, 70, 229, 0.12);
        }

        body {
            font-family: var(--font-sans, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif);
            color: var(--color-text-main);
            background-color: var(--color-bg-base);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        .hero-gradient-overlay {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.94) 0%, rgba(248, 250, 252, 0.88) 100%);
        }

        .dark-mesh-pattern {
            background-color: #0F172A;
            background-image: radial-gradient(rgba(99, 102, 241, 0.15) 1px, transparent 1px);
            background-size: 28px 28px;
        }

        .card-sheen {
            position: relative;
            overflow: hidden;
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .card-sheen:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 36px -6px rgba(15, 23, 42, 0.1);
        }

        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.25s ease-in-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-item.active .faq-content {
            max-height: 380px;
            opacity: 1;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        /* 移动端安全点击区域 */
        button, a {
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }