* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        :root {
            --primary-color: #4b6cb7;
            --secondary-color: #182848;
            --success-color: #28a745;
            --danger-color: #dc3545;
            --warning-color: #ffc107;
            --info-color: #17a2b8;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            padding-top: 70px;
        }
        
        /* 导航栏样式 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            padding: 0.8rem 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            z-index: 1000;
        }
        
        .navbar-brand {
            font-size: 1.5rem;
            font-weight: 700;
            display: flex;
            align-items: center;
        }
        
        .navbar-brand i {
            margin-right: 10px;
            font-size: 1.8rem;
        }
        
        .navbar-nav {
            display: flex;
            align-items: center;
            list-style: none;
        }
        
        .nav-item {
            margin-left: 1.5rem;
        }
        
        .nav-link {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s;
        }
        
        .nav-link:hover {
            opacity: 0.8;
        }
        
        .language-switcher {
            background: rgba(255, 255, 255, 0.2);
            border: none;
            color: white;
            padding: 0.4rem 0.8rem;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 500;
        }
        
        .language-switcher:hover {
            background: rgba(255, 255, 255, 0.3);
        }
        
        .container {
            max-width: 1200px;
            margin: 20px auto;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        
        header {
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            padding: 30px 20px;
            text-align: center;
        }
        
        h1 {
            font-size: 2.2rem;
            margin-bottom: 10px;
        }
        
        .subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
        }
        
        .main-content {
            padding: 30px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        
        @media (max-width: 900px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            
            .navbar {
                padding: 0.8rem 1rem;
            }
            
            .nav-item {
                margin-left: 1rem;
            }
        }
        
        .upload-section {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 10px;
            border: 2px dashed #dae0e6;
        }
        
        .file-list {
            max-height: 300px;
            overflow-y: auto;
            margin-top: 20px;
            border: 1px solid #eee;
            border-radius: 8px;
            padding: 10px;
            background: white;
        }
        
        .file-item {
            display: flex;
            align-items: center;
            padding: 10px;
            border-bottom: 1px solid #f0f0f0;
        }
        
        .file-item:last-child {
            border-bottom: none;
        }
        
        .file-icon {
            width: 40px;
            height: 40px;
            margin-right: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #e9ecef;
            border-radius: 4px;
        }
        
        .file-info {
            flex: 1;
        }
        
        .file-name {
            font-weight: 500;
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 200px;
        }
        
        .file-size {
            font-size: 0.85rem;
            color: var(--gray-color);
        }
        
        .file-status {
            font-size: 0.85rem;
            margin-left: 10px;
            padding: 4px 8px;
            border-radius: 4px;
        }
        
        .status-waiting {
            background: #e2e3e5;
            color: #383d41;
        }
        
        .status-processing {
            background: #d1ecf1;
            color: #0c5460;
        }
        
        .status-completed {
            background: #d4edda;
            color: #155724;
        }
        
        .status-error {
            background: #f8d7da;
            color: #721c24;
        }
        
        .progress-bar {
            height: 6px;
            background: #e9ecef;
            border-radius: 3px;
            margin-top: 5px;
            overflow: hidden;
        }
        
        .progress-fill {
            height: 100%;
            background: var(--primary-color);
            width: 0%;
            transition: width 0.3s ease;
        }
        
        .settings-panel {
            margin: 25px 0;
        }
        
        .setting {
            margin-bottom: 20px;
        }
        
        .setting label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: #444;
        }
        
        .slider-container {
            display: flex;
            align-items: center;
        }
        
        .slider {
            flex: 1;
            height: 5px;
            -webkit-appearance: none;
            background: #dde1e7;
            outline: none;
            border-radius: 5px;
        }
        
        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
        }
        
        .slider-value {
            width: 50px;
            text-align: right;
            margin-left: 15px;
            font-weight: 600;
        }
        
        .select-container {
            position: relative;
        }
        
        .select-container select {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 6px;
            background: white;
            font-size: 1rem;
            appearance: none;
        }
        
        .select-container::after {
            content: "▼";
            font-size: 0.8rem;
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            pointer-events: none;
        }
        
        .button {
            display: inline-block;
            padding: 12px 25px;
            background: var(--primary-color);
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .button:hover {
            background: #3a5999;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        
        .button:active {
            transform: translateY(0);
        }
        
        .button:disabled {
            background: #b0b0b0;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        
        .button-compress {
            width: 100%;
            padding: 15px;
            font-size: 1.1rem;
            margin-top: 10px;
        }
        
        .button-download {
            background: var(--success-color);
            width: 100%;
            padding: 15px;
            font-size: 1.1rem;
            margin-top: 15px;
        }
        
        .button-download:hover {
            background: #218838;
        }
        
        .button-clear {
            background: var(--danger-color);
            width: 100%;
            padding: 15px;
            font-size: 1.1rem;
            margin-top: 15px;
        }
        
        .button-clear:hover {
            background: #c82333;
        }
        
        .file-input {
            display: none;
        }
        
        .file-label {
            display: block;
            padding: 40px 20px;
            background: #eef2f7;
            border: 2px dashed #c3cfe2;
            border-radius: 8px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .file-label:hover {
            background: #e2e8f0;
            border-color: var(--primary-color);
        }
        
        .file-label i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 15px;
            display: block;
        }
        
        .stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 25px;
        }
        
        .stat-card {
            background: #f8f9fa;
            padding: 15px;
            border-radius: 8px;
            text-align: center;
        }
        
        .stat-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin: 10px 0;
        }
        
        .stat-label {
            font-size: 0.9rem;
            color: var(--gray-color);
        }
        
        .compression-ratio {
            color: var(--success-color);
        }
        
        .size-reduction {
            color: var(--danger-color);
        }
        
        footer {
            text-align: center;
            padding: 20px;
            color: var(--gray-color);
            font-size: 0.9rem;
            border-top: 1px solid #eee;
        }
        
        .loading {
            display: none;
            text-align: center;
            padding: 20px;
            background: rgba(255, 255, 255, 0.9);
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border-radius: 10px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            z-index: 1000;
        }
        
        .spinner {
            border: 4px solid #f3f3f3;
            border-top: 4px solid var(--primary-color);
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto 15px;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .error-message {
            color: var(--danger-color);
            padding: 10px;
            margin: 10px 0;
            border-radius: 5px;
            background: #f8d7da;
            display: none;
        }
        
        .library-warning {
            background: #fff3cd;
            color: #856404;
            padding: 10px;
            border-radius: 5px;
            margin: 10px 0;
            display: none;
        }
        
        .batch-info {
            margin-top: 15px;
            text-align: center;
            font-size: 0.9rem;
            color: var(--gray-color);
        }
        
        .preview-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 20px;
            max-height: 600px;
            overflow-y: auto;
        }
        
        .preview-item {
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }
        
        .preview-header {
            padding: 10px;
            background: #f8f9fa;
            font-weight: 500;
            font-size: 0.9rem;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        
        .preview-image {
            height: 150px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #f9f9f9;
            overflow: hidden;
        }
        
        .preview-image img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
        }
        
        .preview-info {
            padding: 10px;
            font-size: 0.85rem;
            border-top: 1px solid #eee;
        }
        
        .preview-original {
            color: var(--gray-color);
        }
        
        .preview-compressed {
            color: var(--success-color);
            font-weight: 500;
        }
        
        .remove-file {
            color: var(--danger-color);
            background: none;
            border: none;
            cursor: pointer;
            margin-left: 10px;
            font-size: 1.2rem;
        }
        
        .format-info {
            font-size: 0.8rem;
            color: var(--gray-color);
            margin-top: 5px;
        }
        
        .format-warning {
            color: var(--danger-color);
            background: #f8d7da;
            padding: 8px;
            border-radius: 4px;
            margin-top: 5px;
            display: none;
        }
        
        .smart-suggestion {
            background: #d1ecf1;
            color: #0c5460;
            padding: 10px;
            border-radius: 5px;
            margin-top: 10px;
            display: none;
        }
        
        .confirmation-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 2000;
            align-items: center;
            justify-content: center;
        }
        
        .modal-content {
            background: white;
            padding: 25px;
            border-radius: 10px;
            width: 90%;
            max-width: 500px;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.2);
        }
        
        .modal-buttons {
            display: flex;
            justify-content: flex-end;
            gap: 15px;
            margin-top: 20px;
        }
        
        .modal-button {
            padding: 10px 20px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 500;
        }
        
        .modal-confirm {
            background: var(--danger-color);
            color: white;
        }
        
        .modal-cancel {
            background: var(--gray-color);
            color: white;
        }
        
        .compression-info {
            background: #e9ecef;
            padding: 15px;
            border-radius: 8px;
            margin-top: 20px;
        }

        .compression-info li {
            list-style: none;
        }
        
        .compression-info h3 {
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        
        .breadcrumb {
            padding: 15px 30px;
            background: #f8f9fa;
            border-bottom: 1px solid #eee;
            font-size: 0.9rem;
        }
        
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .breadcrumb span {
            color: var(--gray-color);
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .navbar-nav {
                flex-direction: column;
                align-items: flex-end;
            }
            
            .nav-item {
                margin: 0.5rem 0;
            }
            
            .main-content {
                padding: 20px;
            }
            
            .upload-section {
                padding: 20px;
            }
        }