/* roulang page: index */
:root {
            --bg-main: #0B1120;
            --bg-card: rgba(30, 41, 59, 0.72);
            --primary: #0EA5E9;
            --secondary: #38BDF8;
            --accent: #10B981;
            --text-main: #F8FAFC;
            --text-muted: #94A3B8;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            overflow-x: hidden;
        }

        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-panel:hover {
            border-color: rgba(56, 189, 248, 0.35);
            box-shadow: 0 10px 30px -10px rgba(14, 165, 233, 0.2);
        }

        .glow-btn {
            background: linear-gradient(135deg, #0284C7, #0EA5E9);
            box-shadow: 0 0 20px rgba(14, 165, 233, 0.4);
            transition: all 0.25s ease;
        }

        .glow-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 28px rgba(14, 165, 233, 0.65);
        }

        .glow-border {
            position: relative;
        }
        
        .glow-border::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: inherit;
            padding: 1px;
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.4), transparent, rgba(16, 185, 129, 0.3));
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
        }

        .accordion-content {
            transition: max-height 0.35s ease-out, opacity 0.3s ease;
        }