/* roulang page: index */
:root {
            --primary: #005B5C;
            --accent: #00E599;
            --dark: #0F1722;
            --bg-slate: #F3F5F7;
            --text-dark: #0B131F;
            --text-mid: #3A4659;
            --border-line: rgba(15, 23, 34, 0.08);
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            background-color: var(--bg-slate);
            color: var(--text-dark);
            margin: 0;
            padding: 0;
            line-height: 1.7;
        }
        .container-custom {
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .tech-card {
            background: #ffffff;
            border: 1px solid var(--border-line);
            border-radius: 8px;
            box-shadow: 0 4px 20px -2px rgba(15, 23, 34, 0.05);
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .tech-card:hover {
            transform: translateY(-3px);
            border-color: rgba(0, 91, 92, 0.3);
            box-shadow: 0 10px 25px -4px rgba(0, 91, 92, 0.1);
        }
        .btn-brand-primary {
            background-color: var(--primary);
            color: #ffffff;
            border-radius: 6px;
            transition: all 0.2s ease;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 500;
        }
        .btn-brand-primary:hover {
            background-color: #004445;
            box-shadow: 0 0 12px rgba(0, 229, 153, 0.35);
        }
        .btn-brand-accent {
            background-color: var(--accent);
            color: #0B131F;
            border-radius: 6px;
            transition: all 0.2s ease;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
        }
        .btn-brand-accent:hover {
            background-color: #00c784;
            box-shadow: 0 0 14px rgba(0, 229, 153, 0.55);
        }
        .badge-tag {
            font-size: 12px;
            padding: 2px 10px;
            border-radius: 4px;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        details summary::-webkit-details-marker { display: none; }
        summary { list-style: none; }