/* roulang page: index */
:root {
            --primary: #0F172A;
            --primary-night: #0B1120;
            --accent: #10B981;
            --accent-hover: #059669;
            --tech-blue: #2563EB;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #334155;
            --text-sub: #64748B;
            --border-light: #E2E8F0;
            --border-dark: #1E293B;
            --radius-md: 10px;
            --radius-btn: 6px;
        }

        body {
            background-color: var(--bg-light);
            color: var(--text-muted);
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Inter', sans-serif;
            -webkit-font-smoothing: antialiased;
        }

        .code-window {
            background: #090D16;
            border: 1px solid #1E293B;
            border-radius: 8px;
            box-shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.6);
        }

        .glow-border {
            position: relative;
        }
        .glow-border::after {
            content: '';
            position: absolute;
            inset: -1px;
            background: linear-gradient(90deg, #10B981, #2563EB);
            border-radius: inherit;
            z-index: -1;
            opacity: 0.15;
            transition: opacity 0.3s ease;
        }
        .glow-border:hover::after {
            opacity: 0.45;
        }

        .tech-grid-pattern {
            background-size: 32px 32px;
            background-image: 
                linear-gradient(to right, rgba(226, 232, 240, 0.4) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(226, 232, 240, 0.4) 1px, transparent 1px);
        }
        .dark-tech-pattern {
            background-size: 36px 36px;
            background-image: 
                linear-gradient(to right, rgba(30, 41, 59, 0.5) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(30, 41, 59, 0.5) 1px, transparent 1px);
        }

        .tab-btn.active {
            background-color: #10B981;
            color: #FFFFFF;
            border-color: #10B981;
        }

        .accordion-content {
            transition: max-height 0.35s ease-out, opacity 0.25s ease-in-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-content.open {
            opacity: 1;
        }

        .indicator-dot.active {
            background-color: #10B981;
            width: 24px;
        }