body {
            background-color: #f8f9fa;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        .header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 2rem 0;
            margin-bottom: 2rem;
        }

        .coin-table {
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }

        .coin-logo {
            width: 30px;
            height: 30px;
            border-radius: 50%;
        }

        .coin-logo-large {
            width: 64px;
            height: 64px;
            border-radius: 50%;
        }

        .price-positive {
            color: #28a745;
        }

        .price-negative {
            color: #dc3545;
        }

        .loading-spinner {
            display: none;
            text-align: center;
            padding: 2rem;
        }

        .table-hover tbody tr:hover {
            background-color: #f8f9fa;
            transform: translateY(-1px);
            transition: all 0.2s ease;
            cursor: pointer;
        }

        .market-cap,
        .volume {
            font-size: 0.9rem;
        }

        .refresh-btn {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 1000;
        }

        .detail-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
            padding: 2rem;
            margin-bottom: 2rem;
        }

        .chart-container {
            background: white;
            border-radius: 15px;
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
            padding: 1.5rem;
            margin-bottom: 2rem;
        }

        .portfolio-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
            padding: 1.5rem;
            margin-bottom: 1rem;
        }

        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 1050;
            min-width: 300px;
        }

        .back-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            border-radius: 50px;
            padding: 0.5rem 1.5rem;
        }

        .add-to-portfolio-btn {
            background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
            border: none;
            border-radius: 50px;
            padding: 0.75rem 2rem;
        }

        .nav-pills .nav-link.active {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

        @media (max-width: 768px) {
            .table-responsive {
                font-size: 0.85rem;
            }

            .coin-logo {
                width: 25px;
                height: 25px;
            }

            .detail-card,
            .chart-container {
                padding: 1rem;
                margin-bottom: 1rem;
            }
        }

        .hidden {
            display: none !important;
        }

        .portfolio-item {
            border-left: 4px solid #667eea;
            transition: all 0.3s ease;
        }

        .portfolio-item:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
        }

        #priceChart {
            width: 100%;
        }