/* roulang page: index */
:root {
            --primary: #0F172A;
            --accent-start: #0EA5E9;
            --accent-end: #10B981;
            --bg-light: #F8FAFC;
            --text-main: #334155;
            --radius-card: 1rem;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            overflow-x: hidden;
        }
        .text-gradient {
            background: linear-gradient(135deg, #0EA5E9 0%, #10B981 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .btn-gradient {
            background: linear-gradient(135deg, #0EA5E9 0%, #10B981 100%);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .btn-gradient:hover {
            opacity: 0.95;
            transform: translateY(-2px);
            box-shadow: 0 10px 25px -5px rgba(14, 165, 233, 0.4);
        }
        .border-glow {
            border: 1px solid rgba(14, 165, 233, 0.2);
        }
        .border-glow:hover {
            border-color: rgba(14, 165, 233, 0.5);
        }
        .accordion-content {
            transition: max-height 0.35s ease-out, opacity 0.25s ease-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .accordion-content.open {
            max-height: 280px;
            opacity: 1;
        }