/* AI Agent 落地指南 - 清爽调研报告风格 v2.2.0 */

:root {
    /* 主色调 */
    --color-success: #059669;
    --color-success-light: #10B981;
    --color-success-dark: #047857;
    --color-danger: #E11D48;
    --color-danger-light: #FF7B72;
    --color-warning: #D97706;
    --color-warning-dark: #B45309;
    --color-info: #2563EB;
    --color-info-light: #54AEFF;
    --color-purple: #7C3AED;
    
    /* 中性色 */
    --color-text-primary: #1C1917;
    --color-text-secondary: #57534E;
    --color-text-muted: #78716C;
    --color-border: #E7E5E4;
    --color-border-light: #F5F5F4;
    --color-bg: #F8FAFB;
    --color-bg-card: #FFFFFF;
    --color-bg-table-header: #FAFAF9;
    
    /* 渐变色 */
    --gradient-success: linear-gradient(135deg, #059669 0%, #10B981 100%);
    --gradient-badge: linear-gradient(135deg, #E6F7ED 0%, #E1F0F8 100%);
    --gradient-hero: linear-gradient(135deg, rgba(5, 150, 105, 0.06) 0%, rgba(37, 99, 235, 0.04) 100%);
    
    /* 阴影 */
    --shadow-xs: 0 1px 2px rgba(31, 35, 40, 0.04);
    --shadow-sm: 0 1px 3px rgba(31, 35, 40, 0.06), 0 1px 2px rgba(31, 35, 40, 0.04);
    --shadow-card: 0 2px 8px rgba(31, 35, 40, 0.06), 0 1px 2px rgba(31, 35, 40, 0.04);
    --shadow-md: 0 4px 12px rgba(31, 35, 40, 0.08), 0 2px 4px rgba(31, 35, 40, 0.04);
    --shadow-lg: 0 8px 24px rgba(31, 35, 40, 0.12), 0 4px 8px rgba(31, 35, 40, 0.06);
    --shadow-hover: 0 6px 16px rgba(5, 150, 105, 0.15), 0 2px 6px rgba(5, 150, 105, 0.1);
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 40px;
    --spacing-3xl: 48px;
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --radius-full: 999px;
    
    /* 字体 */
    --font-family: -apple-system, "system-ui", "Segoe UI", "Noto Sans SC", Helvetica, Arial, sans-serif;
    --heading-1: 30px;
    --heading-2: 20px;
    --heading-3: 16px;
    --heading-4: 14px;
    --body-text: 15px;
    --body-small: 14px;
    --caption: 12px;
    
    /* 动画 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 内容宽度 */
    --content-max-width: 980px;
}

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

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.65;
    font-size: var(--body-text);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-3xl);
}

/* ============ 页面头部 ============ */
.header {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-hero);
    border-radius: var(--radius-lg);
}

.header-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) 12px;
    background: var(--gradient-badge);
    color: var(--color-info);
    border-radius: var(--radius-full);
    font-size: var(--caption);
    font-weight: 500;
    letter-spacing: 0.02em;
    margin-bottom: 20px;
    border: 1px solid rgba(37, 99, 235, 0.15);
}

.header-title {
    font-size: var(--heading-1);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-success-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-subtitle {
    font-size: var(--body-text);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.header-meta {
    margin-top: var(--spacing-md);
    font-size: var(--caption);
    color: var(--color-text-muted);
}

/* ============ 核心洞察区域 ============ */
.summary-box {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    position: relative;
    overflow: hidden;
    border-left: 4px solid var(--color-success);
}

.summary-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--caption);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-success);
    margin-bottom: 12px;
}

.summary-label::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
}

.summary-title {
    font-size: var(--heading-2);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

.summary-title em {
    color: var(--color-success);
    font-style: normal;
    font-weight: 700;
}

.summary-text {
    color: var(--color-text-secondary);
    font-size: var(--body-text);
    line-height: 1.7;
}

/* ============ 统计卡片 ============ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

.stat-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-success);
    opacity: 0;
    transition: var(--transition-normal);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-success);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-icon {
    font-size: 28px;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.stat-value.green { color: var(--color-success); }
.stat-value.red { color: var(--color-danger); }
.stat-value.orange { color: var(--color-warning); }
.stat-value.blue { color: var(--color-info); }
.stat-value.purple { color: var(--color-purple); }

.stat-label {
    font-size: var(--caption);
    color: var(--color-text-muted);
    font-weight: 500;
}

/* ============ Tab导航 ============ */
.tab-nav {
    display: flex;
    flex-wrap: nowrap;
    gap: 4px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 6px;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    position: sticky;
    top: 12px;
    z-index: 100;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
}

.tab-btn:hover {
    background: var(--color-bg-table-header);
    color: var(--color-text-secondary);
}

.tab-btn.active {
    background: var(--gradient-success);
    color: #fff;
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.25);
}

.tab-btn-num {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.06);
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
}

.tab-btn.active .tab-btn-num {
    background: rgba(255,255,255,0.2);
}

/* ============ 章节卡片 ============ */
.section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-card);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
}

.section-number {
    width: 32px;
    height: 32px;
    background: var(--gradient-success);
    color: #fff;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(5, 150, 105, 0.25);
}

.section-title {
    font-size: var(--heading-2);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.subsection-title {
    font-size: var(--heading-3);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.subsection-title::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--gradient-success);
    border-radius: 2px;
}

/* ============ 章节概览图 ============ */
.section-overview {
    background: linear-gradient(135deg, #F8FAF9 0%, #F3F7F5 100%);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.section-overview-label {
    position: absolute;
    top: 12px;
    left: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(5, 150, 105, 0.1);
    color: var(--color-success);
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.section-overview-label::before {
    content: '📊';
    font-size: 12px;
}

.section-overview-content {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 160px;
    padding-top: 24px;
}

.section-overview svg {
    max-width: 100%;
    height: auto;
}

.section-overview-caption {
    text-align: center;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
    font-style: italic;
}

/* ============ 内容卡片网格 ============ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--color-bg-table-header);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--color-success);
    box-shadow: var(--shadow-sm);
}

.card-icon {
    font-size: 32px;
    margin-bottom: var(--spacing-sm);
}

.card-title {
    font-size: var(--heading-4);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.card-desc {
    font-size: var(--body-small);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============ 流程步骤 ============ */
.steps {
    display: flex;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 200px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    position: relative;
}

.step-number {
    width: 28px;
    height: 28px;
    background: var(--gradient-success);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--caption);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.step-title {
    font-size: var(--heading-4);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.step-desc {
    font-size: var(--body-small);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.step-arrow {
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-success);
    font-size: 20px;
    font-weight: bold;
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
    }
    .step-arrow {
        display: none;
    }
}

/* ============ 表格 ============ */
.table-wrap {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--body-small);
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: middle;
}

th {
    background: var(--color-bg-table-header);
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: var(--heading-4);
    letter-spacing: 0.02em;
    white-space: nowrap;
}

tbody tr {
    transition: background var(--transition-fast);
}

tbody tr:hover td { 
    background: rgba(5, 150, 105, 0.02); 
}

td:first-child { 
    font-weight: 500;
    color: var(--color-text-primary);
}

tr:last-child td { 
    border-bottom: none; 
}

/* ============ 标签 ============ */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--caption);
    font-weight: 500;
    white-space: nowrap;
    line-height: 1.5;
}

.tag-green { 
    background: rgba(5, 150, 105, 0.12); 
    color: var(--color-success);
}

.tag-orange { 
    background: rgba(217, 119, 6, 0.12); 
    color: var(--color-warning-dark);
}

.tag-red { 
    background: rgba(225, 29, 72, 0.12); 
    color: var(--color-danger);
}

.tag-blue { 
    background: rgba(37, 99, 235, 0.12); 
    color: var(--color-info);
}

.tag-purple {
    background: rgba(124, 58, 237, 0.12);
    color: var(--color-purple);
}

/* ============ 引用框 ============ */
.quote {
    background: var(--color-bg-table-header);
    border-left: 4px solid var(--color-info);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: var(--spacing-md) 20px;
    margin: 20px 0;
}

.quote-text {
    font-size: var(--body-text);
    font-style: italic;
    color: var(--color-text-primary);
    line-height: 1.7;
}

.quote-author {
    font-size: var(--caption);
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
    font-weight: 500;
}

/* ============ 洞察框 ============ */
.insight-box {
    border-left: 4px solid var(--color-warning);
    background: rgba(217, 119, 6, 0.06);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: var(--spacing-md) 20px;
    margin: var(--spacing-lg) 0;
}

.insight-title {
    font-size: var(--heading-4);
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--color-warning-dark);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.insight-title::before {
    content: '💡';
    font-size: 16px;
}

.insight-text {
    color: var(--color-text-secondary);
    font-size: var(--body-text);
    line-height: 1.7;
}

/* ============ 对比框 ============ */
.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

@media (max-width: 768px) {
    .compare-grid {
        grid-template-columns: 1fr;
    }
}

.compare-box {
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.compare-box.negative {
    background: rgba(225, 29, 72, 0.04);
    border: 1px solid rgba(225, 29, 72, 0.15);
}

.compare-box.positive {
    background: rgba(5, 150, 105, 0.04);
    border: 1px solid rgba(5, 150, 105, 0.15);
}

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

.compare-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #fff;
}

.compare-box.negative .compare-icon {
    background: var(--color-danger);
}

.compare-box.positive .compare-icon {
    background: var(--color-success);
}

.compare-title {
    font-size: var(--heading-4);
    font-weight: 600;
}

.compare-box.negative .compare-title {
    color: var(--color-danger);
}

.compare-box.positive .compare-title {
    color: var(--color-success);
}

.compare-list {
    list-style: none;
}

.compare-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--body-small);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    line-height: 1.6;
}

.compare-list li::before {
    content: '•';
    color: var(--color-text-muted);
    font-weight: bold;
}

/* ============ 时间线 ============ */
.timeline {
    position: relative;
    padding-left: 30px;
    margin: var(--spacing-lg) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 4px;
    width: 12px;
    height: 12px;
    background: var(--color-success);
    border-radius: 50%;
    border: 3px solid var(--color-bg);
}

.timeline-title {
    font-size: var(--heading-4);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-time {
    font-size: var(--caption);
    color: var(--color-success);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.timeline-desc {
    font-size: var(--body-small);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============ 页脚 ============ */
.footer {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--color-border-light);
    margin-top: var(--spacing-2xl);
}

.footer-text {
    font-size: var(--caption);
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.footer-link {
    color: var(--color-info);
    text-decoration: none;
    font-size: var(--body-small);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-success);
}

/* ============ 列表样式 ============ */
.content-list {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.content-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.content-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 600;
}

/* ============ 特色卡片 ============ */
.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-success);
    opacity: 0;
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-success);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 40px;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: var(--heading-3);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    font-size: var(--body-small);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============ 数字高亮 ============ */
.highlight-number {
    font-size: 48px;
    font-weight: 800;
    background: var(--gradient-success);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

/* ============ 响应式 ============ */
@media (max-width: 768px) {
    .header-title {
        font-size: 24px;
    }
    
    .section-overview-content {
        overflow-x: auto;
    }
    
    .section-overview svg {
        transform: scale(0.9);
        transform-origin: center;
    }
}

@media (max-width: 480px) {
    .header-title {
        font-size: 20px;
    }
    
    .section-overview svg {
        transform: scale(0.75);
    }
    
    .tab-btn {
        padding: 8px 12px;
        font-size: 12px;
    }
}

/* ============ 打印样式 ============ */
@media print {
    .tab-nav {
        display: none;
    }
    
    .section {
        break-inside: avoid;
    }
}