* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

main {
    padding: 30px;
}

/* 上传区域 */
.upload-section {
    margin-bottom: 30px;
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9ff;
}

.upload-area:hover {
    border-color: #764ba2;
    background: #f0f2ff;
    transform: translateY(-2px);
}

.upload-area.drag-over {
    border-color: #764ba2;
    background: #e8ebff;
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    stroke-width: 2;
    color: #667eea;
}

.upload-text {
    font-size: 1.2em;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.upload-hint {
    color: #666;
    font-size: 0.9em;
}

/* 设置区域 */
.settings-section {
    background: #f8f9ff;
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
}

.settings-section h3 {
    margin-bottom: 15px;
    color: #667eea;
}

.settings-grid {
    display: grid;
    gap: 15px;
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.setting-item label {
    font-weight: 600;
    min-width: 100px;
}

.setting-item input[type="number"],
.setting-item select {
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    width: 100px;
}

.setting-item input[type="range"] {
    flex: 1;
    max-width: 200px;
}

.setting-item input[type="number"]:focus,
.setting-item select:focus {
    outline: none;
    border-color: #667eea;
}

.setting-desc {
    color: #666;
    font-size: 0.85em;
}

/* 文件列表 */
.file-list-section,
.progress-section,
.result-section {
    margin-bottom: 30px;
}

.file-list-section h3,
.progress-section h3,
.result-section h3 {
    margin-bottom: 15px;
    color: #667eea;
}

#fileList {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 15px;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 15px;
    background: #f8f9ff;
    border-radius: 10px;
    margin-bottom: 10px;
    transition: all 0.2s ease;
}

.file-item:hover {
    background: #f0f2ff;
    transform: translateX(5px);
}

.file-name {
    flex: 1;
    font-weight: 500;
    color: #333;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-size {
    color: #666;
    font-size: 0.9em;
    margin: 0 15px;
}

.btn-remove {
    background: #ff4757;
    color: white;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2em;
    transition: all 0.2s ease;
}

.btn-remove:hover {
    background: #ff3838;
    transform: scale(1.1);
}

/* 按钮 */
.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

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

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

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
    transform: translateY(-2px);
}

.btn-small {
    padding: 6px 15px;
    font-size: 0.9em;
}

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 30px;
    background: #e9ecef;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 15px;
}

.progress-text {
    text-align: center;
    color: #666;
    font-weight: 500;
}

/* 结果列表 */
#resultList {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 15px;
}

.result-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    background: #f8f9ff;
    border-radius: 10px;
    margin-bottom: 10px;
    transition: all 0.2s ease;
}

.result-item:hover {
    background: #f0f2ff;
}

.result-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.result-name {
    font-weight: 500;
    color: #333;
}

.result-size {
    color: #666;
    font-size: 0.85em;
}

.result-actions {
    display: flex;
    gap: 10px;
}

/* 页脚 */
footer {
    background: #f8f9ff;
    padding: 20px;
    text-align: center;
    color: #666;
    font-size: 0.9em;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    main {
        padding: 20px;
    }
    
    .upload-area {
        padding: 40px 15px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .file-item,
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .file-size,
    .result-size {
        margin: 0;
    }
}