/* roulang page: index */
:root {
            --primary: #1e40af;
            --primary-hover: #3b82f6;
            --accent: #10b981;
            --bg-base: #f8fafc;
            --text-main: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
        }
        body {
            font-family: var(--font-sans, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif);
            background-color: var(--bg-base);
            color: var(--text-main);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .hero-diagonal {
            clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
        }
        @media (max-width: 768px) {
            .hero-diagonal {
                clip-path: none;
            }
        }
        .card-hover {
            transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 30px -10px rgba(15, 23, 42, 0.12);
        }