.clocks-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin: 20px 0;
        }
        .clock-card {
            background: #f8f9fa;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
        }
        .city-name {
            font-size: 1.2rem;
            font-weight: bold;
            color: #495057;
            margin-bottom: 10px;
        }
        .time-display {
            font-family: 'Courier New', monospace;
            font-size: 2rem;
            font-weight: bold;
            color: #007acc;
            margin: 10px 0;
        }
        .date-display {
            font-size: 0.9rem;
            color: #6c757d;
            margin-bottom: 5px;
        }
        .timezone-display {
            font-size: 0.8rem;
            color: #6c757d;
        }
        .add-timezone {
            background: #f8f9fa;
            border: 2px dashed #e9ecef;
            border-radius: 8px;
            padding: 40px 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .add-timezone:hover {
            border-color: #007acc;
            background: #e3f2fd;
        }
        .add-timezone-text {
            color: #6c757d;
            font-size: 1.1rem;
        }
        select {
            padding: 8px 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
            margin: 10px;
            width: 250px;
        }
        .remove-btn {
            background: #dc3545;
            color: white;
            border: none;
            border-radius: 4px;
            padding: 4px 8px;
            cursor: pointer;
            font-size: 12px;
            margin-top: 10px;
        }
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
        }
        .modal-content {
            background: white;
            margin: 10% auto;
            padding: 20px;
            border-radius: 8px;
            width: 90%;
            max-width: 400px;
        }
        .modal-header {
            font-size: 1.2rem;
            font-weight: bold;
            margin-bottom: 20px;
        }
        .modal-buttons {
            display: flex;
            gap: 10px;
            justify-content: flex-end;
            margin-top: 20px;
        }
        .btn {
            padding: 8px 16px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }
        .btn-primary {
            background: #007acc;
            color: white;
        }
        .btn-secondary {
            background: #6c757d;
            color: white;
        }