/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* 主要内容区域 */
.main-content {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
    margin-bottom: 30px;
}

/* 上传区域 */
.upload-section {
    padding: 40px;
    text-align: center;
}

.upload-area {
    border: 3px dashed #ddd;
    border-radius: 12px;
    padding: 60px 40px;
    transition: all 0.3s ease;
    cursor: pointer;
    background: #fafafa;
}

.upload-area:hover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: #667eea;
    background: #e8f2ff;
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.6;
}

.upload-area h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: #333;
}

.upload-area p {
    color: #666;
    margin-bottom: 30px;
}

.upload-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

/* 设置区域 */
.settings-section {
    padding: 40px;
    background: #f8f9fa;
    border-top: 1px solid #eee;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.setting-group {
    display: flex;
    flex-direction: column;
}

.setting-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
    font-size: 0.95rem;
}

.setting-group select,
.setting-group input[type="number"] {
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: white;
}

.setting-group select:focus,
.setting-group input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.setting-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.setting-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

/* 操作按钮 */
.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.compress-btn,
.reset-btn,
.download-all-btn {
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 140px;
}

.compress-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.4);
}

.compress-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.6);
}

.reset-btn {
    background: #6c757d;
    color: white;
}

.reset-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.download-all-btn {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.4);
}

.download-all-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.6);
}

/* 文件列表 */
.files-section,
.results-section {
    padding: 40px;
    border-top: 1px solid #eee;
}

.files-section h3,
.results-section h3 {
    margin-bottom: 20px;
    color: #333;
    font-size: 1.3rem;
}

.files-list,
.results-list {
    display: grid;
    gap: 15px;
}

.file-item,
.result-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.file-info {
    flex: 1;
    margin-left: 15px;
}

.file-name {
    font-weight: 600;
    margin-bottom: 5px;
}

.file-details {
    font-size: 0.9rem;
    color: #666;
}

.file-preview {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid #ddd;
}

/* 结果摘要 */
.results-summary {
    background: linear-gradient(135deg, #e8f5e8 0%, #f0f8f0 100%);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid #28a745;
}

.summary-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    text-align: center;
}

.stat-item {
    padding: 10px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #28a745;
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
}

/* 下载按钮 */
.download-btn {
    background: #007bff;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.3s ease;
}

.download-btn:hover {
    background: #0056b3;
}

.download-actions {
    text-align: center;
    margin-top: 20px;
}

/* 进度条 */
.progress-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.progress-container {
    background: white;
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    min-width: 300px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.progress-text {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #333;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-info {
    color: #666;
    font-size: 0.9rem;
}

/* 支持格式 */
.supported-formats {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.supported-formats h3 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
    font-size: 1.3rem;
}

.formats-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 15px;
}

.format-tag {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.formats-note {
    text-align: center;
    color: #666;
    font-size: 0.9rem;
    font-style: italic;
}

/* 页脚 */
.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .settings-section,
    .files-section,
    .results-section {
        padding: 25px;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .compress-btn,
    .reset-btn,
    .download-all-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .file-item,
    .result-item {
        flex-direction: column;
        text-align: center;
    }
    
    .file-info {
        margin-left: 0;
        margin-top: 10px;
    }
    
    .summary-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .upload-area {
        padding: 30px 15px;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .upload-area h3 {
        font-size: 1.2rem;
    }
    
    .progress-container {
        margin: 20px;
        padding: 30px 20px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* 隐藏元素的平滑过渡 */
.hidden {
    display: none !important;
}

.show {
    display: block !important;
    animation: fadeIn 0.5s ease-out;
}

/* 图片预览悬浮窗口 */
.preview-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.preview-container {
    background: white;
    border-radius: 16px;
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: 0 25px 50px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    border-bottom: 1px solid #eee;
    background: #f8f9fa;
}

.preview-header h3 {
    margin: 0;
    color: #333;
    font-size: 1.2rem;
}

.preview-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: #666;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.preview-close:hover {
    background: #e9ecef;
    color: #333;
}

.preview-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    min-height: 300px;
    max-height: 70vh;
    overflow: hidden;
}

.preview-content img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.preview-info {
    padding: 20px 25px;
    background: #f8f9fa;
    border-top: 1px solid #eee;
    color: #666;
    font-size: 0.9rem;
    text-align: center;
}

/* 预览窗口响应式设计 */
@media (max-width: 768px) {
    .preview-container {
        max-width: 95vw;
        max-height: 95vh;
    }
    
    .preview-header {
        padding: 15px 20px;
    }
    
    .preview-header h3 {
        font-size: 1.1rem;
    }
    
    .preview-content {
        padding: 15px;
        min-height: 200px;
        max-height: 60vh;
    }
    
    .preview-info {
        padding: 15px 20px;
    }
}