/* roulang page: index */
:root {
            --primary: #0F2E5C;
            --accent: #0284C7;
            --gold: #D97706;
            --darkbg: #0A192F;
            --text-main: #334155;
            --text-muted: #64748B;
            --text-title: #0F172A;
            --bg-light: #F8FAFC;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.75;
            letter-spacing: 0;
            overflow-x: hidden;
        }
        .hero-clip-bg {
            clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
        }
        .hero-card-diagonal {
            transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
            transition: transform 0.4s ease;
        }
        .hero-card-diagonal:hover {
            transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
        }
        .card-custom {
            background-color: #FFFFFF;
            border: 1px solid #F1F5F9;
            box-shadow: 0 4px 20px -4px rgba(15, 46, 92, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            box-shadow: 0 12px 30px -6px rgba(15, 46, 92, 0.12);
            transform: translateY(-4px);
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        html {
            scroll-behavior: smooth;
        }