/* ================================================================
 * SPSSzero 帮助手册 · 样式
 *
 * 设计原则：
 *  - 独立于主站 app.min.js，不共享任何 CSS 变量
 *  - 现代 CSS Grid + Flexbox（不依赖 Bootstrap）
 *  - 以学术内容为本：Inter + 思源宋体回退，克制配色
 * ================================================================ */

:root {
  --hb-bg: #fafafa;
  --hb-surface: #ffffff;
  --hb-surface-hover: #f5f7fa;
  --hb-border: #e5e7eb;
  --hb-border-strong: #d1d5db;
  --hb-text: #1f2937;
  --hb-text-sub: #6b7280;
  --hb-text-muted: #9ca3af;
  --hb-primary: #2563eb;
  --hb-primary-hover: #1d4ed8;
  --hb-primary-soft: #eff6ff;
  --hb-accent: #6366f1;
  --hb-success: #10b981;
  --hb-radius: 10px;
  --hb-radius-lg: 14px;
  --hb-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --hb-shadow-md: 0 2px 8px rgba(15, 23, 42, 0.06);
  --hb-shadow-lg: 0 6px 20px rgba(15, 23, 42, 0.08);
  --hb-font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --hb-font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC",
    "SimSun", serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: var(--hb-font-sans);
  color: var(--hb-text);
  background: var(--hb-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.help-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--hb-primary);
  text-decoration: none;
}
a:hover {
  color: var(--hb-primary-hover);
}

svg {
  flex-shrink: 0;
  vertical-align: middle;
}

/* ================================================================
 * Header
 * ================================================================ */
.help-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--hb-border);
}

.help-header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.help-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--hb-text);
  font-weight: 600;
}

.help-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--hb-primary), var(--hb-accent));
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: -0.02em;
}

.help-logo-text {
  font-size: 17px;
  letter-spacing: -0.01em;
}

.help-topnav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.help-topnav a {
  color: var(--hb-text-sub);
  font-size: 14px;
  padding: 6px 14px;
  border-radius: 6px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.help-topnav a:hover {
  background: var(--hb-surface-hover);
  color: var(--hb-text);
}

.help-topnav a.active {
  color: var(--hb-primary);
  background: var(--hb-primary-soft);
}

/* ================================================================
 * Hero + Search
 * ================================================================ */
.help-hero {
  background: linear-gradient(180deg, #ffffff 0%, #f5f7fb 100%);
  border-bottom: 1px solid var(--hb-border);
  padding: 64px 24px 72px;
}

.help-hero-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.help-hero-title {
  font-size: 38px;
  font-weight: 700;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
  color: var(--hb-text);
  font-family: var(--hb-font-sans);
}

.help-hero-sub {
  font-size: 15px;
  color: var(--hb-text-sub);
  margin: 0 0 32px;
}

.help-search {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border-strong);
  border-radius: 999px;
  padding: 4px 4px 4px 20px;
  box-shadow: var(--hb-shadow-md);
  transition: box-shadow 0.15s, border-color 0.15s;
}

.help-search:focus-within {
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1), var(--hb-shadow-md);
  border-color: var(--hb-primary);
}

.help-search-icon {
  color: var(--hb-text-muted);
  display: inline-flex;
}

.help-search input {
  flex: 1;
  border: none;
  outline: none;
  font: inherit;
  font-size: 15px;
  background: transparent;
  padding: 14px 12px;
  color: var(--hb-text);
}

.help-search input::placeholder {
  color: var(--hb-text-muted);
}

.help-search-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: var(--hb-radius-lg);
  box-shadow: var(--hb-shadow-lg);
  max-height: 420px;
  overflow-y: auto;
  z-index: 10;
  text-align: left;
}

.help-search-dropdown a {
  display: block;
  padding: 10px 16px;
  color: var(--hb-text);
  border-bottom: 1px solid var(--hb-border);
  transition: background 0.1s;
}

.help-search-dropdown a:last-child {
  border-bottom: none;
}

.help-search-dropdown a:hover,
.help-search-dropdown a.active {
  background: var(--hb-primary-soft);
}

.help-search-dropdown .hb-result-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--hb-text);
}

.help-search-dropdown .hb-result-meta {
  font-size: 12px;
  color: var(--hb-text-muted);
  margin-top: 2px;
}

.help-search-dropdown .hb-result-preview {
  font-size: 12px;
  color: var(--hb-text-sub);
  margin-top: 4px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.help-search-dropdown mark {
  background: #fef08a;
  color: #854d0e;
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 600;
}

.help-article-content mark {
  background: #fef08a;
  color: #854d0e;
  padding: 0 2px;
  border-radius: 2px;
}

/* KaTeX 渲染容器 */
.help-formula-block {
  display: block;
  margin: 20px auto;
  text-align: center;
  font-size: 1.05em;
  overflow-x: auto;
}

.help-formula:not(.help-formula-block) {
  display: inline-block;
  vertical-align: middle;
}

/* KaTeX 加载失败时的 fallback（span 还空着）*/
.help-formula:empty::before {
  content: attr(data-latex);
  font-family: "JetBrains Mono", Menlo, Consolas, monospace;
  color: var(--hb-text-sub);
  font-size: 0.9em;
}

/* 案例数据下载 tile */
.help-ds-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
  margin: 16px 0;
}
.help-ds-tile {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: 8px;
  color: var(--hb-text);
  font-size: 13px;
  transition: all 0.15s;
}
.help-ds-tile:hover {
  border-color: var(--hb-primary);
  background: var(--hb-primary-soft);
  color: var(--hb-primary);
}
.help-ds-lbl { font-weight: 500; }
.help-ds-fn {
  font-size: 11px;
  color: var(--hb-text-muted);
  font-family: "JetBrains Mono", Menlo, Consolas, monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.help-ds-tile:hover .help-ds-fn {
  color: var(--hb-primary);
  opacity: 0.7;
}

/* 数据格式说明页 */
.help-df-cat {
  padding: 20px 0;
  border-bottom: 1px solid var(--hb-border);
}
.help-df-cat:last-child { border-bottom: none; }
.help-df-cat h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 600;
}
.help-df-list {
  list-style: none;
  padding: 0;
  margin: 0 0 10px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 6px 20px;
}
.help-df-list li {
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.help-df-list a {
  color: var(--hb-text-sub);
  transition: color 0.1s;
}
.help-df-list a:hover {
  color: var(--hb-primary);
  text-decoration: underline;
}

.help-search-dropdown .hb-empty {
  padding: 24px;
  text-align: center;
  color: var(--hb-text-muted);
  font-size: 13px;
}

.help-search-hot {
  margin-top: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
}

.help-search-hot-label {
  color: var(--hb-text-muted);
}

.help-hot-tag {
  color: var(--hb-text-sub);
  padding: 4px 12px;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: 999px;
  transition: all 0.15s;
}

.help-hot-tag:hover {
  background: var(--hb-primary-soft);
  color: var(--hb-primary);
  border-color: var(--hb-primary);
}

/* ================================================================
 * Breadcrumb
 * ================================================================ */
.help-breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px 0;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--hb-text-muted);
}

.help-breadcrumb a {
  color: var(--hb-text-sub);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.help-breadcrumb a:hover {
  color: var(--hb-primary);
}

.help-breadcrumb .hb-current {
  color: var(--hb-text);
  font-weight: 500;
}

/* ================================================================
 * Main content sections
 * ================================================================ */
.help-main {
  flex: 1;
}

.help-section {
  padding: 48px 24px;
}

.help-section-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.help-section-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  color: var(--hb-text);
}

/* ================================================================
 * Quick-start 5 卡片
 * ================================================================ */
.help-quick-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.help-quick-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 16px;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: var(--hb-radius);
  color: var(--hb-text);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  text-align: center;
}

.help-quick-card:hover {
  transform: translateY(-2px);
  border-color: var(--hb-primary);
  box-shadow: var(--hb-shadow-md);
  color: var(--hb-text);
}

.help-quick-icon {
  color: var(--hb-primary);
  display: inline-flex;
}

.help-quick-title {
  font-size: 14px;
  font-weight: 500;
}

/* ================================================================
 * 12 卡片栅格
 * ================================================================ */
.help-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.help-card {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: var(--hb-radius-lg);
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
  min-height: 180px;
}

.help-card:hover {
  border-color: var(--hb-primary);
  box-shadow: var(--hb-shadow-md);
  transform: translateY(-2px);
}

.help-card-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--hb-primary);
  background: var(--hb-primary-soft);
  border-radius: 10px;
}

.help-card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.help-card-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--hb-text);
}

.help-card-list {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
  flex: 1;
}

.help-card-list li {
  margin-bottom: 6px;
}

.help-card-list a {
  font-size: 13px;
  color: var(--hb-text-sub);
  line-height: 1.5;
  transition: color 0.1s;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.help-card-list a:hover {
  color: var(--hb-primary);
}

.help-card-list .help-card-empty {
  font-size: 13px;
  color: var(--hb-text-muted);
  font-style: italic;
}

.help-card-more {
  font-size: 13px;
  color: var(--hb-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: auto;
  font-weight: 500;
}

.help-card-more:hover {
  color: var(--hb-primary-hover);
  gap: 6px;
}

/* ================================================================
 * 分类页
 * ================================================================ */
.help-cat-hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.help-cat-icon {
  width: 72px;
  height: 72px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--hb-primary);
  background: var(--hb-primary-soft);
  border-radius: 14px;
}

.help-cat-title {
  font-size: 32px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
}

.help-cat-sub {
  color: var(--hb-text-muted);
  margin: 4px 0 0;
  font-size: 14px;
}

.help-cat-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.help-cat-list li {
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: 8px;
  transition: all 0.15s;
}

.help-cat-list li:hover {
  border-color: var(--hb-primary);
  background: var(--hb-primary-soft);
}

.help-cat-list a {
  display: block;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--hb-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.help-cat-list a:hover {
  color: var(--hb-primary);
}

/* ================================================================
 * 文章页
 * ================================================================ */
.help-article {
  padding: 32px 24px 64px;
}

.help-article-inner {
  max-width: 820px;
  margin: 0 auto;
}

.help-article-header {
  padding-bottom: 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--hb-border);
}

.help-article-cat {
  display: inline-block;
  font-size: 12px;
  color: var(--hb-primary);
  background: var(--hb-primary-soft);
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 500;
  margin-bottom: 12px;
}

.help-article-title {
  font-size: 32px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--hb-text);
}

/* 文章正文 */
.help-article-content {
  font-size: 15px;
  color: var(--hb-text);
  line-height: 1.8;
}

.help-article-content h1,
.help-article-content h2,
.help-article-content h3,
.help-article-content h4 {
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2em 0 0.8em;
  line-height: 1.3;
}
.help-article-content h1 { font-size: 24px; }
.help-article-content h2 { font-size: 20px; border-bottom: 1px solid var(--hb-border); padding-bottom: 8px; }
.help-article-content h3 { font-size: 17px; color: var(--hb-text); }
.help-article-content h4 { font-size: 15px; color: var(--hb-text-sub); }

.help-article-content p {
  margin: 0 0 1em;
}

.help-article-content ul,
.help-article-content ol {
  padding-left: 1.6em;
  margin: 0 0 1em;
}

.help-article-content li {
  margin-bottom: 0.3em;
}

.help-article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 14px;
}

.help-article-content table th,
.help-article-content table td {
  padding: 10px 14px;
  border: 1px solid var(--hb-border);
  text-align: left;
}

.help-article-content table th {
  background: var(--hb-surface-hover);
  font-weight: 600;
}

.help-article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 12px 0;
  border: 1px solid var(--hb-border);
}

.help-article-content code {
  font-family: "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  background: var(--hb-surface-hover);
  padding: 2px 6px;
  border-radius: 4px;
  color: #c2410c;
}

.help-article-content pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1em 0;
  font-size: 13px;
  line-height: 1.6;
}

.help-article-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.help-article-content blockquote {
  border-left: 3px solid var(--hb-primary);
  background: var(--hb-primary-soft);
  padding: 12px 16px;
  margin: 1em 0;
  color: var(--hb-text);
  border-radius: 0 8px 8px 0;
}

.help-article-content blockquote p:last-child {
  margin-bottom: 0;
}

/* ================================================================
 * 文章页：TOC 侧栏 + 上下篇
 * ================================================================ */
.help-article-wrapper {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 40px;
  align-items: start;
}

.help-article-wrapper .help-article {
  padding: 0;
  min-width: 0;
}

.help-article-wrapper .help-article-inner {
  max-width: none;
  padding-top: 32px;
}

.help-toc {
  position: sticky;
  top: 80px;
  margin-top: 32px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding: 16px 18px;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: 10px;
  font-size: 13px;
}

.help-toc-title {
  font-weight: 600;
  color: var(--hb-text);
  padding-bottom: 8px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--hb-border);
  font-size: 13px;
}

.help-toc-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.help-toc-nav a {
  color: var(--hb-text-sub);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
  line-height: 1.5;
  border-left: 2px solid transparent;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: all 0.1s;
}

.help-toc-nav a.help-toc-l2 { padding-left: 8px; font-weight: 500; color: var(--hb-text); }
.help-toc-nav a.help-toc-l3 { padding-left: 20px; }
.help-toc-nav a.help-toc-l4 { padding-left: 32px; font-size: 12px; color: var(--hb-text-muted); }

.help-toc-nav a:hover,
.help-toc-nav a.active {
  background: var(--hb-primary-soft);
  color: var(--hb-primary);
  border-left-color: var(--hb-primary);
}

/* 上下篇导航 */
.help-pn {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--hb-border);
}

.help-pn-prev,
.help-pn-next {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  background: var(--hb-surface);
  border: 1px solid var(--hb-border);
  border-radius: 10px;
  color: var(--hb-text);
  transition: all 0.15s;
  overflow: hidden;
}

.help-pn-next {
  text-align: right;
}

.help-pn-prev:hover,
.help-pn-next:hover {
  border-color: var(--hb-primary);
  background: var(--hb-primary-soft);
  color: var(--hb-primary);
}

.help-pn-arrow {
  font-size: 12px;
  color: var(--hb-text-muted);
}

.help-pn-prev:hover .help-pn-arrow,
.help-pn-next:hover .help-pn-arrow {
  color: var(--hb-primary);
}

.help-pn-title {
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.help-pn-placeholder {
  /* 空占位：上一篇或下一篇不存在时占一格 */
  visibility: hidden;
}

/* 锚点跳转偏移（避免被 sticky header 遮挡）*/
.help-article-content h2[id],
.help-article-content h3[id],
.help-article-content h4[id] {
  scroll-margin-top: 80px;
}

/* 窄屏：TOC 移到文章上方 */
@media (max-width: 1024px) {
  .help-article-wrapper {
    grid-template-columns: 1fr;
  }
  .help-toc {
    position: static;
    max-height: none;
    order: -1;
    margin-top: 24px;
  }
}

/* ChatBI 提示 */
.help-ai-hint {
  max-width: 820px;
  margin: 48px auto 0;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  background: linear-gradient(135deg, #eef2ff, #eff6ff);
  border: 1px solid #c7d2fe;
  border-radius: var(--hb-radius-lg);
}

.help-ai-icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--hb-primary), var(--hb-accent));
  color: #fff;
  border-radius: 12px;
  flex-shrink: 0;
}

.help-ai-body {
  flex: 1;
  min-width: 0;
}

.help-ai-title {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 2px;
}

.help-ai-desc {
  font-size: 13px;
  color: var(--hb-text-sub);
}

.help-ai-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  background: var(--hb-primary);
  color: #fff;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  flex-shrink: 0;
}

.help-ai-btn:hover {
  background: var(--hb-primary-hover);
  color: #fff;
}

/* ================================================================
 * Footer
 * ================================================================ */
.help-footer {
  border-top: 1px solid var(--hb-border);
  margin-top: 48px;
  padding: 24px;
  background: var(--hb-surface);
}

.help-footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--hb-text-muted);
}

.help-footer-inner a {
  color: var(--hb-text-muted);
}

.help-footer-inner a:hover {
  color: var(--hb-primary);
}

/* ================================================================
 * 响应式
 * ================================================================ */
@media (max-width: 1100px) {
  .help-cards-grid { grid-template-columns: repeat(3, 1fr); }
  .help-quick-grid { grid-template-columns: repeat(5, 1fr); }
}

@media (max-width: 900px) {
  .help-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .help-cat-list { grid-template-columns: repeat(2, 1fr); }
  .help-hero-title { font-size: 28px; }
  .help-hero { padding: 40px 20px 48px; }
}

@media (max-width: 640px) {
  .help-cards-grid { grid-template-columns: 1fr; }
  .help-quick-grid { grid-template-columns: repeat(2, 1fr); }
  .help-cat-list { grid-template-columns: 1fr; }
  .help-header-inner { gap: 16px; padding: 0 16px; }
  .help-topnav a { padding: 6px 10px; font-size: 13px; }
  .help-section { padding: 32px 20px; }
  .help-hero-title { font-size: 24px; }
  .help-cat-hero { flex-direction: column; text-align: center; align-items: center; padding: 32px 20px; }
  .help-article-title { font-size: 24px; }
  .help-ai-hint { flex-direction: column; align-items: flex-start; }
}