/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 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;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

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

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

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 40px;
    text-align: center;
    background: #f8f9ff;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: #5a67d8;
    background: #f0f4ff;
}

.upload-area.dragover {
    border-color: #4c51bf;
    background: #e6fffa;
    transform: scale(1.02);
}

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

.upload-area h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #4a5568;
}

.upload-area p {
    color: #718096;
    margin-bottom: 20px;
}

/* 按钮样式 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a67d8;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #e2e8f0;
    color: #4a5568;
}

.btn-secondary:hover {
    background: #cbd5e0;
}

/* 文件信息区域 */
.file-info-section {
    margin-bottom: 30px;
}

.file-info {
    background: #f7fafc;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
}

.file-info h3 {
    margin-bottom: 20px;
    color: #2d3748;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: white;
    border-radius: 8px;
}

.label {
    font-weight: 600;
    color: #4a5568;
}

/* 处理选项 */
.processing-options {
    background: #f7fafc;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
}

.processing-options h3 {
    margin-bottom: 20px;
    color: #2d3748;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.option-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 15px;
    background: white;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.option-item:hover {
    background: #edf2f7;
}

.option-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e0;
    border-radius: 4px;
    margin-right: 12px;
    position: relative;
    transition: all 0.3s ease;
}

.option-item input[type="checkbox"]:checked + .checkmark {
    background: #667eea;
    border-color: #667eea;
}

.option-item input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: -2px;
    left: 3px;
    color: white;
    font-weight: bold;
}

.password-input {
    background: white;
    border-radius: 8px;
    padding: 20px;
}

.password-input label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #4a5568;
}

.password-input input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.password-input input:focus {
    outline: none;
    border-color: #667eea;
}

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

/* 进度区域 */
.progress-section {
    margin-bottom: 30px;
}

.progress-container {
    background: #f7fafc;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
}

.progress-container h3 {
    margin-bottom: 25px;
    color: #2d3748;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: #e2e8f0;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 6px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: #4a5568;
}

/* 结果区域 */
.result-section {
    margin-bottom: 30px;
}

.result-container {
    background: #f7fafc;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.result-container h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #2d3748;
}

.result-container p {
    color: #718096;
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.result-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 功能特点 */
.features {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.features h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #2d3748;
    font-size: 2rem;
}

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

.feature-item {
    text-align: center;
    padding: 30px 20px;
    border-radius: 15px;
    background: #f8f9ff;
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-item h4 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2d3748;
}

.feature-item p {
    color: #718096;
    line-height: 1.6;
}

/* 使用说明 */
.instructions {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.instructions h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #2d3748;
    font-size: 2rem;
}

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

.step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.step-number {
    width: 50px;
    height: 50px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content h4 {
    margin-bottom: 10px;
    color: #2d3748;
    font-size: 1.2rem;
}

.step-content p {
    color: #718096;
    line-height: 1.6;
}

/* 安全说明 */
.security-note {
    background: white;
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.security-note h3 {
    margin-bottom: 15px;
    color: #2d3748;
    font-size: 1.5rem;
}

.security-note p {
    color: #718096;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}

/* 加载动画 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255,255,255,0.3);
    border-top: 5px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 25px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .info-grid,
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons,
    .result-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .features-grid,
    .steps {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
    
    .step-number {
        margin: 0 auto 15px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .upload-area {
        padding: 30px 15px;
    }
    
    .file-info,
    .processing-options,
    .progress-container,
    .result-container {
        padding: 20px;
    }
    
    .features,
    .instructions,
    .security-note {
        padding: 25px;
    }
}

/* 状态指示器 */
.status-indicator {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.status-yes {
    background: #fed7d7;
    color: #c53030;
}

.status-no {
    background: #c6f6d5;
    color: #38a169;
}

.status-unknown {
    background: #faf089;
    color: #d69e2e;
}

/* 动画效果 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}