body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #cbeaed;
        }
        .header {
            background-color: #e5f9ff;
            padding: 10px 20px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        .search-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .search-bar input, .search-bar select {
            padding: 8px;
            margin-right: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
            margin-bottom: 10px;
        }
        .search-bar button {
            padding: 8px 15px;
            background-color: #d32f2f;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }
        .breadcrumb {
            color: #666;
            font-size: 14px;
            margin-bottom: 10px;
        }
        .container {
            display: flex;
            padding: 20px;
            gap: 20px;
        }
        .sidebar {
            width: 200px;
            flex-shrink: 0;
        }
        .sidebar h3, .sidebar h4 {
            margin-top: 0;
        }
        .sidebar label {
            display: block;
            margin: 5px 0;
        }
        .sidebar input[type="number"] {
            width: 80px;
            padding: 5px;
            margin: 5px 0;
        }
        .main-content {
            flex: 1;
        }
        .tour-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        .tour-card {
            background-color: #fff;
            border: 1px solid #ddd;
            border-radius: 4px;
            padding: 10px;
            width: calc(33.33% - 10px);
            box-sizing: border-box;
            margin-bottom: 15px;
        }
        .tour-card img {
            width: 100%;
            height: 43%;
            object-fit: cover;
            margin-right: 10px;
        }
        .tour-details {
            flex: 1;
        }
        .tour-details h4 {
            margin: 0;
            color: #d32f2f;
            font-size: 16px;
        }
        .tour-details p {
            margin: 5px 0;
            font-size: 14px;
        }
        .price {
            text-align: right;
        }
        .price .original {
            text-decoration: line-through;
            color: #999;
        }
        .price .discounted {
            color: #d32f2f;
            font-weight: bold;
        }
        .tour-card button {
            padding: 5px 10px;
            background-color: #d32f2f;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            margin-left: 5px;
        }
        .filters {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }
        .filters select {
            padding: 5px;
            border: 1px solid #ccc;
            border-radius: 4px;
            margin-right: 10px;
        }
        .hidden {
            display: none;
        }
        .no-results {
            color: #d32f2f;
            font-style: italic;
        }
        /* Responsive adjustments */
        @media (max-width: 1024px) {
            .tour-card {
                width: 100%;
            }
        }
        @media (max-width: 768px) {
            .container {
                overflow-x: auto;
                min-width: 600px; /* Đảm bảo nội dung không bị co quá nhỏ */
            }
            .sidebar {
                width: 150px;
            }
            .tour-card {
                width: 100%;
            }
            .tour-card img {
                width: 100%;
                height: auto;
            }
            .tour-details h4 {
                font-size: 14px;
            }
            .tour-details p {
                font-size: 12px;
            }
            .price .original, .price .discounted {
                font-size: 12px;
            }
            .tour-card button {
                padding: 4px 8px;
                font-size: 12px;
            }
        }
        @media (max-width: 550px) {
            .container {
                min-width: 500px;
                padding: 10px;
                gap: 10px;
            }
            .sidebar {
                width: 120px;
            }
            .sidebar h3, .sidebar h4 {
                font-size: 14px;
            }
            .sidebar label {
                font-size: 12px;
            }
            .sidebar input[type="number"] {
                width: 60px;
                padding: 3px;
            }
            .tour-card {
                padding: 8px;
            }
            .tour-card img {
                width: 100%;
                height: auto;
                margin-right: 8px;
            }
            .tour-details h4 {
                font-size: 13px;
            }
            .tour-details p {
                font-size: 11px;
                margin: 3px 0;
            }
            .price .original, .price .discounted {
                font-size: 11px;
            }
            .tour-card button {
                padding: 3px 6px;
                font-size: 11px;
                margin-left: 3px;
            }
            .filters select, .filters button {
                padding: 4px;
                font-size: 12px;
            }
        }