/* roulang page: index */
:root {
            --primary: #0052FF;
            --primary-hover: #0041CC;
            --accent: #00E599;
            --dark-surface: #0A0D14;
            --dark-card: #121824;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-color: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #F8FAFC;
            line-height: 1.75;
            scroll-behavior: smooth;
        }
        .text-gradient {
            background: linear-gradient(135deg, #0052FF 0%, #00C6FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-bg {
            background: linear-gradient(rgba(10, 13, 20, 0.88), rgba(10, 13, 20, 0.94)), url('/assets/images/ff48f7c3f7ccd68f.webp') center/cover no-repeat;
        }
        .card-hover-effect {
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-hover-effect:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(0, 82, 255, 0.12);
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary .faq-icon {
            transform: rotate(45deg);
        }