/* roulang page: index */
:root {
            --primary: #1865F2;
            --primary-deep: #0B2545;
            --accent: #FF6B00;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, sans-serif;
            background-color: var(--bg-light);
            color: #334155;
            scroll-behavior: smooth;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(11, 37, 69, 0.88), rgba(15, 23, 42, 0.94)), url('/assets/images/96adbb9a3f98346c.jpg');
            background-size: cover;
            background-position: center;
        }
        .deep-band {
            background-image: linear-gradient(rgba(11, 37, 69, 0.95), rgba(15, 23, 42, 0.98)), url('/assets/images/525bd33a31a6f02f.webp');
            background-size: cover;
            background-position: center;
        }
        .card-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(24, 101, 242, 0.12);
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }