/* roulang page: index */
:root {
            --primary: #FF5500;
            --primary-dark: #E04B00;
            --accent-green: #00C07F;
            --bg-dark: #121417;
            --bg-darker: #0B0D0F;
            --bg-light: #F4F6F9;
            --text-main: #2D3748;
            --text-muted: #718096;
            --border-color: #E2E8F0;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }

        .scroll-smooth {
            scroll-behavior: smooth;
        }

        .section-py {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }

        @media (max-width: 768px) {
            .section-py {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }

        .card-shadow {
            box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 35px -5px rgba(255, 85, 0, 0.08), 0 10px 15px -3px rgba(0, 0, 0, 0.04);
        }

        .hero-pattern {
            background-image: linear-gradient(135deg, rgba(18, 20, 23, 0.94) 0%, rgba(11, 13, 15, 0.96) 100%), url('/assets/images/f59d39a3afcc9c0f.webp');
            background-size: cover;
            background-position: center;
        }

        .dark-section-pattern {
            background-image: linear-gradient(180deg, rgba(18, 20, 23, 0.98) 0%, rgba(11, 13, 15, 0.98) 100%), url('/assets/images/ee5143765af49577.webp');
            background-size: cover;
            background-position: center;
        }

        /* 手风琴平滑展开 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details summary {
            list-style: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }