/**
 * AI内容格式转换工具 - 主样式文件
 * 
 * @description 现代化、响应式的UI样式
 * @version 1.0.0
 * @author AI Content Converter Team
 */

/* 导入现代字体 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* CSS变量定义 */
:root {
    /* 主色调 - 升级版 */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-color: #f59e0b;
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-color: #10b981;
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;

    /* 新增渐变色彩 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gradient-cool: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    --gradient-dark: linear-gradient(135deg, #667db6 0%, #0082c8 100%);
    
    /* 文本颜色 */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --text-white: #ffffff;
    
    /* 背景颜色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-dark: #111827;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* 边框颜色 */
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    --border-focus: var(--primary-color);
    
    /* 阴影 - 升级版 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    --shadow-colored: 0 10px 25px -5px rgba(99, 102, 241, 0.2);

    /* 动画变量 */
    --transition-fast: 0.15s ease-out;
    --transition-normal: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
    --animation-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --animation-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 动画 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease-out;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 - 升级版 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--gradient-primary);
    background-attachment: fixed;
    min-height: 100vh;
    padding: var(--spacing-md);
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 动态背景效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
    animation: backgroundShift 20s ease-in-out infinite;
}

@keyframes backgroundShift {
    0%, 100% {
        transform: scale(1) rotate(0deg);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.1) rotate(1deg);
        opacity: 0.8;
    }
}

/* 主容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
}

/* 头部区域 */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    padding: var(--spacing-2xl) var(--spacing-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.1;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.header .subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    font-weight: 400;
    position: relative;
    z-index: 1;
    margin-bottom: var(--spacing-md);
}

.version-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

/* 主要内容区域 */
.main-content {
    padding: var(--spacing-xl);
}

/* 卡片样式 */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* 章节标题 */
.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 1.5rem;
    background: var(--primary-color);
    border-radius: 2px;
}

/* 文本区域样式 */
.textarea-container {
    position: relative;
    margin-bottom: var(--spacing-md);
}

textarea {
    width: 100%;
    min-height: 300px;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: vertical;
    transition: var(--transition);
    background: var(--bg-secondary);
}

textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: var(--bg-primary);
}

textarea::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

/* 文件拖拽区域 */
.file-drop-zone {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    background: rgba(99, 102, 241, 0.05);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.file-drop-zone.active {
    display: flex;
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.drop-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.drop-text {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* 格式提示 */
.format-hint {
    margin-top: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.format-hint::before {
    content: '💡';
    font-size: 1rem;
}

/* 输入统计 - 升级版 */
.input-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.stats-group {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    cursor: default;
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    font-size: 1rem;
    opacity: 0.8;
}

.stat-value {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9rem;
    min-width: 20px;
    text-align: center;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.quick-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.quick-btn {
    width: 36px;
    height: 36px;
    min-width: auto;
    padding: 0;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.quick-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.quick-btn:hover .btn-icon {
    filter: brightness(0) invert(1);
    transform: scale(1.1);
}

.btn-icon {
    font-size: 1rem;
    transition: all var(--transition-normal);
}

/* 智能检测结果面板 */
.detection-result-panel {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    animation: slideInDown 0.5s ease-out;
}

.detection-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.detection-icon {
    font-size: 1.2rem;
    animation: pulse 2s infinite;
}

.detection-title {
    font-weight: 600;
    color: var(--primary-color);
    flex: 1;
}

.detection-confidence {
    background: var(--success-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
}

.detection-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.detected-type {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.detection-features {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* 高级选项 */
.advanced-options {
    grid-column: 1 / -1;
}

.advanced-toggle {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.advanced-toggle:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
    color: var(--text-primary);
}

.toggle-icon {
    font-size: 1rem;
}

.toggle-text {
    flex: 1;
    text-align: left;
}

.toggle-arrow {
    transition: transform var(--transition-normal);
}

.advanced-toggle.active .toggle-arrow {
    transform: rotate(180deg);
}

.advanced-content {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}

.advanced-option {
    margin-bottom: var(--spacing-md);
}

.advanced-option:last-child {
    margin-bottom: 0;
}

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* 策略信息样式 */
.strategy-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(99, 102, 241, 0.05);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary-color);
}

.strategy-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.strategy-icon {
    font-size: 1rem;
}

.strategy-name {
    font-weight: 600;
    color: var(--primary-color);
    flex: 1;
}

.strategy-confidence {
    background: var(--primary-color);
    color: white;
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-xs);
    font-size: 0.75rem;
    font-weight: 600;
}

.strategy-reasons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.reason-tag {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-xs);
    font-size: 0.75rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* 推荐面板样式 */
.recommendation-panel {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(99, 102, 241, 0.05) 100%);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.recommendation-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.rec-icon {
    font-size: 1.2rem;
}

.rec-title {
    font-weight: 600;
    color: var(--success-color);
    font-size: 1rem;
}

.recommendation-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.rec-item {
    background: white;
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.rec-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.rec-item.primary {
    border-color: var(--success-color);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.02) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.rec-item.secondary {
    border-color: var(--warning-color);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.02) 0%, rgba(245, 158, 11, 0.05) 100%);
}

.rec-badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-xs);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.rec-item.primary .rec-badge {
    background: var(--success-color);
    color: white;
}

.rec-item.secondary .rec-badge {
    background: var(--warning-color);
    color: white;
}

.rec-format {
    font-weight: 600;
    color: var(--text-primary);
    margin-left: var(--spacing-sm);
}

.rec-confidence {
    float: right;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-xs);
    font-size: 0.75rem;
}

.rec-reason {
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.4;
}

/* 预览区域样式 */
.preview-area {
    margin-top: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-light);
}

.preview-header {
    margin-bottom: var(--spacing-md);
}

.preview-header h3 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.preview-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.meta-item {
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
}

.preview-stats {
    margin-bottom: var(--spacing-md);
}

.feature-tag {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.preview-description p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.5;
}

.preview-note {
    background: rgba(16, 185, 129, 0.1);
    border-left: 3px solid var(--success-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.9rem;
}

/* 选项网格 */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.option-group {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.option-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: block;
}

select, input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    transition: var(--transition);
    background: var(--bg-primary);
}

select:focus, input[type="text"]:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* 按钮样式 */
.btn-group {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

button {
    flex: 1;
    min-width: 150px;
    padding: 0.875rem var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    backdrop-filter: blur(10px);
    transform: translateZ(0);
}

/* 按钮悬浮光效 */
button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

button:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--shadow-colored);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-secondary);
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: inherit;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-glow), var(--shadow-xl);
}

.btn-primary:hover::after {
    opacity: 0.1;
}

.btn-primary:active {
    transform: translateY(-1px) scale(1.01);
    transition: transform var(--transition-fast);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

/* 加载动画 */
.loading {
    display: none;
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-text {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    width: 0%;
    transition: width 0.3s ease;
}

/* 预览区域 */
.preview-section {
    border: 2px solid var(--primary-light);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.preview-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-sm);
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.875rem;
    min-width: auto;
    flex: none;
}

.tab-btn.active {
    background: var(--primary-color);
    color: var(--text-white);
}

.tab-btn:hover:not(.active) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.preview-content {
    min-height: 200px;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

/* 结果区域 */
.result-section {
    border: 2px solid var(--success-color);
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.download-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--success-color);
    color: var(--text-white);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.download-btn:hover {
    background: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 示例区域 */
.examples {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    border: 1px solid var(--border-light);
}

.examples h3 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.examples h3::before {
    content: '📚';
    font-size: 1.25rem;
}

.example-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.example-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.875rem;
    min-width: auto;
    flex: none;
}

.example-tab.active {
    background: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
}

.example-tab:hover:not(.active) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--primary-light);
}

.example-content {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.example-item {
    margin-bottom: var(--spacing-lg);
}

.example-item:last-child {
    margin-bottom: 0;
}

.example-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.8rem;
    overflow-x: auto;
    line-height: 1.5;
    color: var(--text-primary);
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-2xl) var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-white);
}

.footer-section p {
    color: #9ca3af;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: #9ca3af;
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--text-white);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-links a {
    display: inline-block;
    font-size: 1.5rem;
    text-decoration: none;
    transition: var(--transition-fast);
    opacity: 0.7;
}

.social-links a:hover {
    opacity: 1;
    transform: scale(1.1);
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding: var(--spacing-md) var(--spacing-xl);
    text-align: center;
    color: #9ca3af;
    font-size: 0.875rem;
}

/* 预览功能样式 */
.preview-section {
    margin-top: 2rem;
}

.preview-tabs {
    display: flex;
    border-bottom: 2px solid #e2e8f0;
    margin-bottom: 1rem;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    color: #64748b;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

.tab-btn.active {
    color: #3b82f6;
    border-bottom-color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

.preview-content {
    min-height: 200px;
    padding: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    background: #f8fafc;
    /* 确保内容可见 */
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.detection-info {
    background: #e0f2fe;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid #0284c7;
}

.detection-info h4 {
    margin: 0 0 0.5rem 0;
    color: #0284c7;
}

.detection-info p {
    margin: 0.25rem 0;
    color: #0369a1;
}

.table-preview {
    margin-top: 1rem;
}

.table-item {
    margin-bottom: 1.5rem;
}

.table-item h5 {
    margin: 0 0 0.5rem 0;
    color: #374151;
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.preview-table th,
.preview-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.preview-table th {
    background: #f1f5f9;
    font-weight: 600;
    color: #374151;
}

.preview-table tr:hover {
    background: #f8fafc;
}

.word-preview .document-preview {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    font-family: 'Times New Roman', serif;
}

.doc-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e2e8f0;
}

.doc-header h3 {
    margin: 0;
    color: #1f2937;
    font-size: 1.5rem;
}

.doc-meta {
    margin: 0.5rem 0 0 0;
    color: #6b7280;
    font-size: 0.9rem;
}

.excel-preview .worksheet-preview {
    margin-bottom: 1.5rem;
}

.sheet-tab {
    background: #f1f5f9;
    padding: 0.5rem 1rem;
    border-radius: 8px 8px 0 0;
    font-weight: 600;
    color: #374151;
    border: 1px solid #e2e8f0;
    border-bottom: none;
    display: inline-block;
}

.excel-table {
    border: 1px solid #e2e8f0;
    border-radius: 0 8px 8px 8px;
    overflow: hidden;
    background: white;
}

.excel-grid {
    width: 100%;
    border-collapse: collapse;
}

.excel-header {
    background: #f1f5f9;
    padding: 0.5rem;
    text-align: center;
    font-weight: 600;
    color: #374151;
    border: 1px solid #d1d5db;
    min-width: 60px;
}

.excel-cell {
    padding: 0.5rem;
    border: 1px solid #d1d5db;
    background: white;
}

.header-cell {
    background: #f9fafb;
    font-weight: 600;
}

.no-tables {
    text-align: center;
    color: #6b7280;
    font-style: italic;
    padding: 2rem;
}

.preview-text {
    line-height: 1.6;
    color: #374151;
}

.preview-text h1,
.preview-text h2,
.preview-text h3 {
    color: #1f2937;
    margin: 1rem 0 0.5rem 0;
}

.preview-text code {
    background: #f1f5f9;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: #dc2626;
}

/* 文件处理进度条样式 */
.file-progress-container {
    margin: 15px 0;
    padding: 20px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: none;
}

.file-progress-content {
    text-align: center;
}

.file-progress-text {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 15px;
}

.file-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
    position: relative;
}

.file-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
}

.file-progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: progress-shine 2s infinite;
}

@keyframes progress-shine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.file-progress-details {
    font-size: 14px;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

/* 移动端触控优化 */
@media (hover: none) and (pointer: coarse) {
    /* 触控设备专用样式 */
    button, .btn, .tab-button, .example-tab {
        min-height: 44px; /* iOS人机界面指南推荐的最小触控目标 */
        min-width: 44px;
        padding: 12px 20px;
        font-size: 16px; /* 防止iOS缩放 */
    }

    /* 增大可点击区域 */
    .theme-toggle, .help-button {
        padding: 12px;
        min-height: 44px;
        min-width: 44px;
    }

    /* 触控反馈增强 */
    button:active, .btn:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }

    /* 移除hover效果，避免触控设备的粘滞状态 */
    button:hover, .btn:hover {
        transform: none;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
        /* 防止横向滚动 */
        overflow-x: hidden;
    }

    .header {
        padding: var(--spacing-xl) var(--spacing-md);
        /* 移动端头部优化 */
        position: sticky;
        top: 0;
        z-index: 100;
        background: var(--background-color);
        backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--border-color);
    }

    .header h1 {
        font-size: 2rem;
        line-height: 1.2;
    }

    .main-content {
        padding: var(--spacing-md);
        /* 改善滚动性能 */
        -webkit-overflow-scrolling: touch;
    }

    .options-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .btn-group {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    button {
        min-width: auto;
        width: 100%;
        /* 触控优化 */
        min-height: 48px;
        font-size: 16px; /* 防止iOS自动缩放 */
        -webkit-tap-highlight-color: transparent;
    }

    textarea {
        min-height: 250px;
        font-size: 16px; /* 防止iOS自动缩放 */
        /* 改善移动端输入体验 */
        -webkit-appearance: none;
        border-radius: 8px;
        resize: vertical;
    }

    /* 虚拟键盘适配 */
    textarea:focus {
        /* 确保输入框在虚拟键盘弹出时可见 */
        transform: translateY(0);
        transition: transform 0.3s ease;
    }

    .example-tabs {
        justify-content: center;
        /* 移动端标签页优化 */
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .example-tabs::-webkit-scrollbar {
        display: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    /* 文件上传区域移动端优化 */
    .file-upload-area {
        padding: var(--spacing-xl);
        min-height: 120px;
        /* 增大触控区域 */
        border-width: 2px;
        border-style: dashed;
    }

    /* 进度条移动端优化 */
    .file-progress-container {
        margin: 10px 0;
        padding: 15px;
    }

    .file-progress-details {
        font-size: 12px;
        word-break: break-all;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-sm);
    }

    .header .subtitle {
        font-size: 1rem;
        line-height: 1.4;
    }

    .card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
        /* 小屏幕优化 */
        border-radius: 6px;
    }

    .section-title {
        font-size: 1.125rem;
        margin-bottom: var(--spacing-md);
    }

    .download-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* 小屏幕专用优化 */
    .main-content {
        padding: var(--spacing-sm);
    }

    .options-grid {
        gap: var(--spacing-sm);
    }

    /* 输入区域优化 */
    textarea {
        min-height: 200px;
        padding: var(--spacing-md);
    }

    /* 按钮组优化 */
    .btn-group {
        gap: var(--spacing-xs);
    }

    button {
        padding: 14px 20px;
        font-size: 15px;
        min-height: 50px;
    }

    /* 统计信息优化 */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .stat-item {
        padding: var(--spacing-sm);
        text-align: center;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .stat-label {
        font-size: 0.75rem;
    }

    /* 示例内容优化 */
    .example-content {
        font-size: 14px;
        padding: var(--spacing-sm);
    }

    /* 消息提示优化 */
    .message {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 14px;
        border-radius: 6px;
    }
}

/* 移动端专用样式 */
.mobile-device {
    /* 减少动画复杂度以提升性能 */
    --transition-duration: 0.2s;
}

.mobile-device * {
    /* 优化触控滚动 */
    -webkit-overflow-scrolling: touch;
}

/* 虚拟键盘弹出时的样式调整 */
.keyboard-open {
    /* 防止页面跳动 */
    position: fixed;
    width: 100%;
}

.keyboard-open .header {
    /* 键盘弹出时隐藏头部以节省空间 */
    transform: translateY(-100%);
    transition: transform 0.3s ease;
}

.keyboard-open .footer {
    /* 键盘弹出时隐藏底部 */
    display: none;
}

/* 触控设备专用交互样式 */
@media (hover: none) and (pointer: coarse) {
    /* 移除所有hover效果，避免触控设备的粘滞状态 */
    *:hover {
        /* 重置所有hover样式 */
    }

    /* 增强触控反馈 */
    button:active, .btn:active, .tab-button:active {
        background-color: var(--primary-color-dark);
        transform: scale(0.98);
    }

    /* 优化选择框在触控设备上的表现 */
    select {
        font-size: 16px; /* 防止iOS缩放 */
        padding: 12px;
        min-height: 44px;
    }

    /* 优化输入框 */
    input, textarea {
        font-size: 16px; /* 防止iOS缩放 */
        -webkit-appearance: none;
        border-radius: 8px;
    }
}

/* 横屏模式优化 */
@media screen and (orientation: landscape) and (max-height: 500px) {
    .header {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .header h1 {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-xs);
    }

    .header .subtitle {
        font-size: 0.9rem;
    }

    .main-content {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    textarea {
        min-height: 150px;
    }

    .card {
        padding: var(--spacing-sm);
    }
}

/* 增强的错误处理样式 */
.error-message {
    margin: 15px 0;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    animation: slideInFromTop 0.3s ease-out;
    max-width: 600px;
}

.error-message.error-info {
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    border-left: 4px solid #2196F3;
}

.error-message.error-warning {
    background: linear-gradient(135deg, #fff3e0, #ffcc02);
    border-left: 4px solid #ff9800;
}

.error-message.error-error {
    background: linear-gradient(135deg, #ffebee, #ffcdd2);
    border-left: 4px solid #f44336;
}

.error-message.error-critical {
    background: linear-gradient(135deg, #fce4ec, #f8bbd9);
    border-left: 4px solid #e91e63;
    animation: pulse 2s infinite;
}

.error-header {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.error-icon {
    font-size: 20px;
    margin-right: 10px;
}

.error-title {
    flex: 1;
    font-weight: 600;
    font-size: 16px;
    color: var(--text-color);
}

.error-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 5px;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.error-close:hover {
    background: rgba(0, 0, 0, 0.1);
}

.error-content {
    padding: 15px 20px;
}

.error-message-text {
    margin: 0 0 15px 0;
    color: var(--text-color);
    line-height: 1.5;
}

.error-suggestions {
    margin: 15px 0;
    padding: 15px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 6px;
}

.suggestions-title {
    margin: 0 0 10px 0;
    font-weight: 600;
    color: var(--text-color);
    font-size: 14px;
}

.suggestions-list {
    margin: 0;
    padding-left: 20px;
}

.suggestions-list li {
    margin: 5px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.error-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.error-action-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.retry-btn {
    background: #4CAF50;
    color: white;
}

.retry-btn:hover {
    background: #45a049;
    transform: translateY(-1px);
}

.fallback-btn {
    background: #2196F3;
    color: white;
}

.fallback-btn:hover {
    background: #1976D2;
    transform: translateY(-1px);
}

.reload-btn {
    background: #ff9800;
    color: white;
}

.reload-btn:hover {
    background: #f57c00;
    transform: translateY(-1px);
}

.help-btn {
    background: #9c27b0;
    color: white;
}

.help-btn:hover {
    background: #7b1fa2;
    transform: translateY(-1px);
}

.error-details {
    padding: 15px 20px;
    background: rgba(0, 0, 0, 0.05);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    font-family: 'Courier New', monospace;
    font-size: 12px;
    color: var(--text-secondary);
}

.error-toggle-details {
    width: 100%;
    padding: 10px;
    background: rgba(0, 0, 0, 0.05);
    border: none;
    cursor: pointer;
    font-size: 12px;
    color: var(--text-secondary);
    transition: background 0.2s ease;
}

.error-toggle-details:hover {
    background: rgba(0, 0, 0, 0.1);
}

/* 帮助对话框样式 */
.help-dialog {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease;
}

.help-dialog-content {
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    animation: slideInFromTop 0.3s ease-out;
}

.help-dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--primary-color);
    color: white;
}

.help-dialog-header h3 {
    margin: 0;
    font-size: 18px;
}

.help-dialog-close {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.help-dialog-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.help-dialog-body {
    padding: 20px;
    overflow-y: auto;
    max-height: 60vh;
}

.help-dialog-body h4 {
    margin: 0 0 15px 0;
    color: var(--primary-color);
}

.help-dialog-body ul {
    margin: 0;
    padding-left: 20px;
}

.help-dialog-body li {
    margin: 8px 0;
    line-height: 1.5;
}

.help-dialog-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    text-align: right;
}

.help-dialog-btn {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}

.help-dialog-btn:hover {
    background: var(--primary-color-dark);
}

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

@keyframes slideInFromTop {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.card {
    animation: fadeIn 0.6s ease-out;
}

.loading.show {
    animation: slideIn 0.3s ease-out;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
    transition: var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* 选择文本样式 */
::selection {
    background: rgba(99, 102, 241, 0.2);
    color: var(--text-primary);
}

/* 焦点可见性 */
button:focus-visible,
select:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 禁用状态 */
button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* 工具提示 */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-fast);
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
}