/* roulang page: index */
:root {
            --bg-night: #0B0E14;
            --bg-surface: #111622;
            --accent-green: #00FF87;
            --accent-orange: #FF6B00;
            --text-main: #FFFFFF;
            --text-sub: #94A3B8;
            --border-subtle: rgba(255, 255, 255, 0.08);
        }
        body {
            background-color: var(--bg-night);
            color: var(--text-main);
            font-family: PingFang SC, "Microsoft YaHei", "Noto Sans SC", sans-serif;
            line-height: 1.8;
            overflow-x: hidden;
        }
        .glow-button {
            background: linear-gradient(135deg, #00FF87 0%, #00CC6A 100%);
            color: #0B0E14;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 4px 20px rgba(0, 255, 135, 0.3);
        }
        .glow-button:hover {
            box-shadow: 0 6px 28px rgba(0, 255, 135, 0.5);
            transform: translateY(-2px);
        }
        .orange-button {
            background: linear-gradient(135deg, #FF6B00 0%, #E05300 100%);
            box-shadow: 0 4px 18px rgba(255, 107, 0, 0.3);
        }
        .orange-button:hover {
            box-shadow: 0 6px 26px rgba(255, 107, 0, 0.5);
            transform: translateY(-2px);
        }
        .card-surface {
            background: #111622;
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.3s ease;
        }
        .card-surface:hover {
            border-color: rgba(0, 255, 135, 0.3);
            transform: translateY(-4px);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 200px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
            color: #00FF87;
        }
        .diagonal-hero {
            clip-path: polygon(0 0, 100% 0, 100% 96%, 0 100%);
        }