:root {
            --primary: #3b82f6;
            --accent: #f59e0b; 
            --bg: #f8fafc;
            --card: #ffffff;
            --text: #1e293b;
            --muted: #64748b;
            --border: #e2e8f0;
            --radius: 12px;
        }

        * { box-sizing: border-box; }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            margin: 0;
            display: flex;
            justify-content: center;
            padding: 20px;
        }

        .container {
            width: 100%;
            max-width: 600px;
            background: var(--card);
            padding: 24px;
            border-radius: var(--radius);
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
            border: 1px solid var(--border);
            margin-top: 100px;
        }

        h1 { margin-top: 0; font-size: 1.5rem; text-align: center; color: var(--text); }

        /* TABS CSS */
        .tabs {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            padding-bottom: 12px;
            margin-bottom: 20px;
            border-bottom: 1px solid var(--border);
        }

        .tab {
            padding: 8px 16px;
            border: 1px solid var(--border);
            background: #fff;
            border-radius: 20px;
            cursor: pointer;
            white-space: nowrap;
            font-weight: 500;
            transition: all 0.2s;
            color: var(--muted);
        }

        .tab.active {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }

        /* SCHEDULE CSS */
        .schedule {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .period {
            padding: 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.2s;
            cursor: pointer;
        }

        .period:hover {
            border-color: var(--primary);
            background: #f1f5f9;
        }

        /* HIGHLIGHT CSS */
        .period.highlight {
            border-color: var(--accent);
            background: #fffbeb;
            transform: scale(1.02);
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.1);
        }

        .period-info h3 { margin: 0; font-size: 1rem; }
        .period-info p { margin: 4px 0 0; font-size: 0.85rem; color: var(--muted); }
        .period-time {
            font-weight: 600;
            font-size: 0.85rem;
            background: #f1f5f9;
            padding: 4px 8px;
            border-radius: 6px;
        }

        @media (max-width: 480px) {
            .tabs { justify-content: flex-start; }
        }