/**
 * AI × 研发效能报告 - 清爽调研报告风格
 * 基于 qingshuang-research-style v1.2.0
 */

/* ==================== CSS 变量定义 ==================== */
:root {
    /* 主色调 */
    --color-success: #1A7F37;
    --color-success-light: #2DA44E;
    --color-danger: #CF222E;
    --color-danger-light: #FF7B72;
    --color-warning: #BF8700;
    --color-warning-dark: #9A6700;
    --color-info: #0969DA;
    --color-info-light: #54AEFF;
    
    /* 中性色 */
    --color-text-primary: #24292F;
    --color-text-secondary: #57606A;
    --color-text-muted: #6E7781;
    --color-border: #D0D7DE;
    --color-border-light: #EAEEF2;
    --color-bg: #FAFBFC;
    --color-bg-card: #FFFFFF;
    --color-bg-table-header: #F6F8FA;
    
    /* 渐变色 */
    --gradient-success: linear-gradient(135deg, #1A7F37 0%, #2DA44E 100%);
    --gradient-badge: linear-gradient(135deg, #DDF4FF 0%, #D4F8E8 100%);
    
    /* 阴影 */
    --shadow-card: rgba(31, 35, 40, 0.04) 0px 1px 3px 0px, rgba(31, 35, 40, 0.04) 0px 3px 8px 0px;
    --shadow-card-light: rgba(31, 35, 40, 0.04) 0px 1px 0px 0px;
    --shadow-lg: 0 8px 24px rgba(140,149,159,0.2);
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 20px;
    
    /* 字体 */
    --font-family: -apple-system, "system-ui", "Segoe UI", "Noto Sans SC", Helvetica, Arial, sans-serif;
    
    /* 字体层级体系 */
    --heading-1: 28px;
    --heading-2: 18px;
    --heading-3: 15px;
    --heading-4: 13px;
    --body-text: 14px;
    --body-small: 13px;
    --caption: 12px;
    
    /* 动画 */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== 基础重置 ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--body-text);
    line-height: 1.7;
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
}

/* ==================== 容器布局 ==================== */
.container {
    max-width: 980px;
    margin: 0 auto;
    padding: var(--spacing-lg) 16px 80px;
    box-sizing: border-box;
}

/* ==================== Hero区域 ==================== */
.hero {
    background: var(--gradient-badge);
    padding: 40px 0 36px;
    margin-bottom: 20px;
    text-align: center;
}

.hero-content {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.8);
    color: var(--color-info);
    padding: var(--spacing-xs) 12px;
    border-radius: var(--radius-full);
    font-size: var(--caption);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(9, 105, 218, 0.15);
}

.hero-title {
    font-size: var(--heading-1);
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

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

/* ==================== Tab导航 ==================== */
.tab-nav {
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    gap: 6px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 8px;
    margin-bottom: var(--spacing-md);
    position: sticky;
    top: 12px;
    z-index: 100;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: var(--shadow-card);
    max-width: 948px; /* 与核心洞察和正文对齐 */
    margin-left: auto;
    margin-right: auto;
    box-sizing: border-box;
}

.tab-btn {
    flex: 1 1 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 14px;
    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;
    min-width: 0;
}

.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(26, 127, 55, 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);
}

.tab-btn-text {
    display: none;
}

@media (min-width: 640px) {
    .tab-btn-text {
        display: inline;
    }
}

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

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

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

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

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

.section-number {
    background: var(--gradient-success);
    color: white;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(26, 127, 55, 0.2);
}

.section-title {
    font-size: var(--heading-2);
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.section-intro {
    font-size: var(--body-text);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.subsection-title {
    font-size: var(--heading-3);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 20px 0 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ==================== 图表容器 ==================== */
.chart-container {
    background: var(--color-bg-table-header);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.chart-title {
    font-size: var(--heading-4);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.chart-title::before,
.chart-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border-light);
    max-width: 100px;
}

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

/* ==================== 统计卡片 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: var(--spacing-md);
}

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

.stat-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    padding: 16px;
    text-align: center;
    position: relative;
    cursor: help;
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

.stat-card:hover .stat-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.stat-value {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.stat-value.success { color: var(--color-success); }
.stat-value.info { color: var(--color-info); }
.stat-value.warning { color: var(--color-warning); }
.stat-value.danger { color: var(--color-danger); }

.stat-label {
    font-size: var(--caption);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* ==================== Tooltip ==================== */
.stat-tooltip {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--color-text-primary);
    color: #fff;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    width: 280px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 100;
    pointer-events: none;
    text-align: left;
}

.stat-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: var(--color-text-primary);
}

.stat-tooltip-title {
    font-weight: 600;
    margin-bottom: 6px;
    color: #fff;
    font-size: var(--body-small);
}

.stat-tooltip-desc {
    color: rgba(255,255,255,0.85);
    font-size: var(--caption);
    line-height: 1.5;
}

/* ==================== 表格样式 ==================== */
.table-wrap {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    -webkit-overflow-scrolling: touch;
}

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

th {
    background: var(--color-bg-table-header);
    color: var(--color-text-secondary);
    padding: 12px 16px;
    font-weight: 600;
    font-size: var(--heading-4);
    text-align: left;
    letter-spacing: 0.02em;
    white-space: nowrap;
    border-bottom: 1px solid var(--color-border);
}

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

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

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

tbody tr:hover td {
    background: rgba(0, 0, 0, 0.02);
}

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

/* 表格状态颜色 */
.status-good { color: var(--color-success); }
.status-warn { color: var(--color-warning); }
.status-bad { color: var(--color-danger); }

/* ==================== 标签样式 ==================== */
.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;
}

.tag-green {
    background: rgba(26, 127, 55, 0.12);
    color: var(--color-success);
}

.tag-orange {
    background: rgba(191, 135, 0, 0.12);
    color: var(--color-warning-dark);
}

.tag-red {
    background: rgba(207, 34, 46, 0.12);
    color: var(--color-danger);
}

.tag-blue {
    background: rgba(9, 105, 218, 0.12);
    color: var(--color-info);
}

/* ==================== 两列布局 ==================== */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

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

.col-box {
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-table-header);
}

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

.col-box-title.red { color: var(--color-danger); }
.col-box-title.green { color: var(--color-success); }
.col-box-title.blue { color: var(--color-info); }

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

.col-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--body-text);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    line-height: 1.7;
}

.col-list li::before {
    content: '•';
    color: var(--color-text-muted);
    flex-shrink: 0;
    font-weight: bold;
}

/* ==================== 引用框 ==================== */
.quote {
    background: var(--color-bg-table-header);
    border-left: 3px solid var(--color-info);
    padding: 14px 18px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: var(--spacing-md) 0;
    transition: all var(--transition-fast);
}

.quote:hover {
    border-left-width: 4px;
    background: rgba(9, 105, 218, 0.04);
}

.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: 3px solid var(--color-warning);
    background: rgba(191, 135, 0, 0.05);
    padding: 14px 18px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: var(--spacing-md) 0;
    transition: all var(--transition-fast);
}

.insight-box:hover {
    border-left-width: 4px;
    background: rgba(191, 135, 0, 0.08);
}

.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: '';
    width: 8px;
    height: 8px;
    background: var(--color-warning);
    border-radius: 50%;
}

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

.insight-content strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.insight-content ul {
    margin: 12px 0;
    padding-left: 20px;
}

.insight-content ul li {
    margin-bottom: 6px;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-md);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -26px;
    top: 4px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-info);
    border: 2px solid var(--color-bg-card);
    box-shadow: 0 0 0 2px var(--color-info);
}

.timeline-dot.success {
    background: var(--color-success);
    box-shadow: 0 0 0 2px var(--color-success);
}

.timeline-dot.warning {
    background: var(--color-warning);
    box-shadow: 0 0 0 2px var(--color-warning);
}

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

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

/* ==================== 步骤卡片 ==================== */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin: var(--spacing-md) 0;
}

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

.step-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    transition: all var(--transition-fast);
}

.step-card:hover {
    border-color: var(--color-success);
    box-shadow: 0 4px 12px rgba(26, 127, 55, 0.1);
}

.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: 12px;
    font-weight: 600;
    margin: 0 auto 12px;
}

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

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

/* ==================== 法则卡片（正文内部使用） ==================== */
section:not(.core-findings) .laws-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

@media (max-width: 768px) {
    section:not(.core-findings) .laws-grid {
        grid-template-columns: 1fr;
    }
}

section:not(.core-findings) .law-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

section:not(.core-findings) .law-card:hover {
    border-color: var(--color-info);
    box-shadow: 0 4px 12px rgba(9, 105, 218, 0.1);
}

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

section:not(.core-findings) .law-number {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, #0969da 0%, #1a7f37 100%);
    color: #fff;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--caption);
    font-weight: 600;
}

section:not(.core-findings) .law-title {
    font-size: var(--heading-3);
    font-weight: 600;
    color: var(--color-text-primary);
}

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

/* ==================== 公司卡片 ==================== */
.company-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

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

.company-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.company-name {
    font-size: var(--heading-3);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.company-desc {
    font-size: var(--body-text);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.company-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.company-feature {
    background: var(--color-bg-table-header);
    color: var(--color-text-secondary);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: var(--caption);
    font-weight: 500;
}

/* ==================== 特性列表 ==================== */
.feature-list {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.feature-list li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
    font-size: var(--body-text);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li a {
    color: var(--color-info);
    text-decoration: none;
}

.feature-list li a:hover {
    text-decoration: underline;
}

/* ==================== 免责声明 ==================== */
.disclaimer {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--color-bg-table-header);
    border-radius: var(--radius-md);
}

.disclaimer-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
}

.disclaimer-icon svg {
    width: 100%;
    height: 100%;
}

.disclaimer-text {
    font-size: var(--caption);
    color: var(--color-text-muted);
    line-height: 1.6;
}

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

.footer-quote {
    font-size: var(--body-text);
    font-style: italic;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto var(--spacing-md);
    line-height: 1.6;
}

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