/* نفس الـ CSS السابق - يمكن وضعه في ملف منفصل */
        :root {
            --primary-color: #3498db;
            --secondary-color: #2ecc71;
            --accent-color: #e74c3c;
            --light-color: #f9f9f9;
            --dark-color: #2c3e50;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f5f7fa;
            color: var(--dark-color);
            line-height: 1.6;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 20px 0;
            border-radius: 10px;
            margin-bottom: 30px;
            box-shadow: var(--shadow);
            text-align: center;
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }

        .subtitle {
            font-size: 1.2rem;
            opacity: 0.9;
        }

        .dashboard {
            display: grid;
            grid-template-columns: 1fr 3fr;
            gap: 20px;
            margin-bottom: 30px;
        }

        .controls {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }

        .tabs {
            display: flex;
            margin-bottom: 20px;
            border-bottom: 1px solid #eee;
        }

        .tab {
            padding: 10px 15px;
            cursor: pointer;
            border-bottom: 3px solid transparent;
        }

        .tab.active {
            border-bottom: 3px solid var(--primary-color);
            color: var(--primary-color);
            font-weight: 600;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        .form-group {
            margin-bottom: 15px;
        }

        label {
            display: block;
            margin-bottom: 5px;
            font-weight: 600;
        }

        input, select, button {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
        }

        button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s;
            font-weight: 600;
        }

        button:hover {
            background-color: #2980b9;
        }

        .timetable-container {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            overflow-x: auto;
        }

        .class-selector {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding: 15px;
            background-color: #f8f9fa;
            border-radius: 8px;
        }

        .week-navigation {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .week-navigation button {
            width: auto;
            padding: 8px 15px;
        }

        .timetable {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }

        .timetable th, .timetable td {
            padding: 12px 15px;
            text-align: center;
            border: 1px solid #e1e1e1;
        }

        .timetable th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 600;
        }

        .timetable tr:nth-child(even) {
            background-color: #f8f9fa;
        }

        .timetable tr:hover {
            background-color: #e9f7fe;
        }

        .subject {
            padding: 8px;
            border-radius: 5px;
            color: white;
            font-weight: 500;
            margin: 2px 0;
        }

        .stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .stat-card {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            text-align: center;
        }

        .stat-card h3 {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .stat-card p {
            color: var(--dark-color);
            font-weight: 600;
        }

        footer {
            text-align: center;
            margin-top: 40px;
            padding: 20px;
            color: #7f8c8d;
            font-size: 0.9rem;
        }

        .today-classes {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }

        .today-classes h2 {
            color: var(--primary-color);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .class-item {
            display: flex;
            justify-content: space-between;
            padding: 10px;
            border-bottom: 1px solid #eee;
        }

        .class-item:last-child {
            border-bottom: none;
        }

        .loading {
            text-align: center;
            padding: 20px;
            color: var(--primary-color);
        }

        @media (max-width: 768px) {
            .dashboard {
                grid-template-columns: 1fr;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            .class-selector {
                flex-direction: column;
                gap: 15px;
            }
        }