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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

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

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
    color: #ffeb3b;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-top: 10px;
}

/* 章节样式 */
.section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.section:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0,0,0,0.15);
}

/* 上传区域样式 */
.upload-zone {
    border: 3px dashed #e0e0e0;
    border-radius: 15px;
    padding: 60px 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-zone:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.upload-zone.dragover {
    border-color: #667eea;
    background: #e8f0fe;
    transform: scale(1.02);
}

.upload-icon i {
    font-size: 4rem;
    color: #667eea;
    margin-bottom: 20px;
    display: block;
}

.upload-zone h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: #333;
}

.upload-zone p {
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.upload-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 50px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

/* 预览区域样式 */
.preview-container {
    margin-top: 30px;
}

.preview-container h4 {
    margin-bottom: 20px;
    color: #333;
    font-size: 1.3rem;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.preview-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    aspect-ratio: 1;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.preview-item:hover {
    transform: scale(1.05);
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-item .remove-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(255, 0, 0, 0.8);
    color: white;
    border: none;
    border-radius: 50%;
    width: 25px;
    height: 25px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.preview-item .remove-btn:hover {
    background: rgba(255, 0, 0, 1);
    transform: scale(1.1);
}

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

/* 按钮样式 */
.btn {
    padding: 12px 25px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-secondary {
    background: #f5f5f5;
    color: #333;
    border: 2px solid #e0e0e0;
}

.btn-secondary:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* 加载区域样式 */
.loading-container {
    text-align: center;
    padding: 60px 40px;
}

.loading-spinner {
    display: inline-block;
    margin-bottom: 30px;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-container h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: #333;
}

.loading-container p {
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #f0f0f0;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    transition: width 0.5s ease;
    width: 0%;
}

.progress-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: #667eea;
}

/* 结果区域样式 */
.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

.result-header h3 {
    font-size: 1.8rem;
    color: #333;
    display: flex;
    align-items: center;
    gap: 10px;
}

.result-header i {
    color: #667eea;
}

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

/* 洞察摘要样式 */
.insight-summary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
}

.insight-summary h4 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.insight-summary i {
    color: #ffeb3b;
}

.insight-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

/* 标签页样式 */
.analysis-tabs {
    display: flex;
    border-bottom: 2px solid #f0f0f0;
    margin-bottom: 30px;
    overflow-x: auto;
}

.tab-btn {
    padding: 15px 25px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1rem;
    color: #666;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
    font-weight: 600;
}

.tab-btn:hover {
    color: #667eea;
    background: #f8f9ff;
}

.tab-content {
    min-height: 300px;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 分析结果卡片样式 */
.analysis-card {
    background: #f8f9ff;
    border-left: 4px solid #667eea;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 0 10px 10px 0;
}

.analysis-card h5 {
    color: #667eea;
    font-size: 1.2rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.analysis-card p {
    color: #555;
    line-height: 1.7;
}

.analysis-card h6 {
    color: #667eea;
    font-size: 1rem;
    margin: 15px 0 8px 0;
    font-weight: 600;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.tag {
    background: #667eea;
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

/* 错误提示样式 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #ff5252;
    color: white;
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    transform: translateX(400px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .section {
        padding: 25px 20px;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .upload-zone {
        padding: 40px 20px;
    }
    
    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 10px;
    }
    
    .result-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .analysis-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .upload-actions {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .upload-zone {
        padding: 30px 15px;
    }
    
    .upload-zone h3 {
        font-size: 1.5rem;
    }
    
    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}