/* roulang page: index */
:root {
            --primary: #00E599;
            --primary-hover: #00C885;
            --accent: #10B981;
            --alert: #FF5722;
            --bg-light: #F8FAFC;
            --bg-dark: #0F172A;
            --bg-darker: #090D16;
            --text-main: #0F172A;
            --text-muted: #475569;
            --text-sub: #94A3B8;
            --border-light: rgba(15, 23, 42, 0.08);
            --border-dark: rgba(255, 255, 255, 0.1);
            --radius-card: 12px;
            --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.05);
            --shadow-hover: 0 12px 24px -4px rgba(0, 229, 153, 0.14);
        }

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

        .section-padding {
            padding-top: 5.5rem;
            padding-bottom: 5.5rem;
        }

        @media (min-width: 1024px) {
            .section-padding {
                padding-top: 7rem;
                padding-bottom: 7rem;
            }
        }

        .card-interaction {
            transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
        }
        .card-interaction:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(0, 229, 153, 0.4);
        }

        .glass-nav {
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .dark-grid-bg {
            background-color: var(--bg-darker);
            background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                              linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        details summary::-webkit-details-marker {
            display: none;
        }

        details[open] summary svg {
            transform: rotate(180deg);
        }