@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Nunito:wght@300;400;500;600;700&display=swap');

/* =============================================
   CSS 变量 & 基础
   ============================================= */
:root {
  --c-primary: #5cc6b0;
  --c-primary-dark: #3da891;
  --c-aux: #d4c4a8;
  --c-aux-light: #ede4d3;
  --c-ink: #172623;
  --c-ink-soft: #2e4740;
  --c-ink-muted: #5a6e68;
  --c-bg: #f7f2ea;
  --c-bg-warm: #ede4d3;
  --c-bg-card: #faf7f2;
  --c-terracotta: #c67b5c;
  --c-sand: #b8a88a;
  --c-white: #fff;
  --c-border: #d9cebf;

  --font-head: 'Fredoka', 'Nunito', system-ui, sans-serif;
  --font-body: 'Nunito', system-ui, sans-serif;

  --nav-width: 220px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  --shadow-card: 0 2px 12px rgba(23,38,35,0.10), 0 1px 3px rgba(23,38,35,0.06);
  --shadow-hover: 0 6px 24px rgba(23,38,35,0.14), 0 2px 6px rgba(23,38,35,0.08);
  --shadow-nav: 2px 0 16px rgba(23,38,35,0.08);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.25s var(--ease-out);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-ink);
  background: var(--c-bg);
  overflow-x: hidden;
}

/* =============================================
   粒纹质感叠层
   ============================================= */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.4;
}

/* =============================================
   布局骨架：左侧固定导航 + 右侧内容
   ============================================= */
.site-wrap {
  display: flex;
  min-height: 100vh;
  flex-direction: row;
}

.site-header {
  position: fixed;
  top: 0; left: 0;
  width: var(--nav-width);
  height: 100vh;
  background: var(--c-ink);
  display: flex;
  flex-direction: column;
  gap: 0;
  z-index: 200;
  box-shadow: var(--shadow-nav);
  overflow-y: auto;
  overflow-x: hidden;
}

.site-header__brand {
  padding: 28px 20px 20px;
  border-bottom: 1px solid rgba(212,196,168,0.15);
}

.brand-logo {
  display: block;
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
}

.brand-name {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-primary);
  text-decoration: none;
  display: block;
  line-height: 1.2;
  letter-spacing: 0.01em;
}
.brand-name:hover { color: var(--c-aux); }

.brand-tagline {
  font-size: 0.72rem;
  color: rgba(212,196,168,0.6);
  display: block;
  margin-top: 4px;
  line-height: 1.4;
}

.site-header__search {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(212,196,168,0.1);
}

.search-form {
  display: flex;
  gap: 4px;
}

.search-form__input {
  flex: 1;
  background: rgba(212,196,168,0.1);
  border: 1px solid rgba(212,196,168,0.2);
  border-radius: var(--radius-pill);
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--c-aux);
  outline: none;
  min-width: 0;
  transition: border-color var(--transition);
}
.search-form__input::placeholder { color: rgba(212,196,168,0.4); }
.search-form__input:focus { border-color: var(--c-primary); }

.search-form__btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  min-width: 40px;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.search-form__btn:hover { background: rgba(92,198,176,0.15); }

.site-nav {
  display: flex;
  flex-direction: column;
  padding: 12px 0 24px;
  flex: 1;
}

.nav-link {
  display: block;
  padding: 11px 20px;
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(212,196,168,0.82);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  line-height: 1.4;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.nav-link:hover {
  color: var(--c-primary);
  background: rgba(92,198,176,0.07);
  border-left-color: var(--c-primary);
}
.nav-link--active {
  color: var(--c-primary);
  background: rgba(92,198,176,0.12);
  border-left-color: var(--c-primary);
  font-weight: 600;
}

.page-body {
  margin-left: var(--nav-width);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: 0;
}

/* =============================================
   Hero — 首页
   ============================================= */
.hero--home {
  min-height: 45vh;
  background: var(--c-ink);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  position: relative;
  overflow: hidden;
  padding: 48px 56px 80px 40px;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.hero--home::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(92,198,176,0.12) 0%, rgba(23,38,35,0.0) 60%);
}

.hero__text {
  position: relative;
  z-index: 2;
  text-align: right;
  max-width: 560px;
}

.hero__h1 {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.2;
  margin-bottom: 14px;
  letter-spacing: 0.01em;
}

.hero__lead {
  font-size: 1rem;
  color: rgba(212,196,168,0.85);
  margin-bottom: 24px;
  line-height: 1.6;
}

.hero__btn {
  display: inline-block;
  background: var(--c-primary);
  color: var(--c-ink);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.hero__btn:hover {
  background: var(--c-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(92,198,176,0.3);
}

.hero__media {
  position: absolute;
  left: 40px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  opacity: 0.18;
}
.hero__media--empty { display: none; }
.hero__img {
  max-width: 280px;
  height: auto;
  border-radius: var(--radius-lg);
}

.hero__divider {
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 40px;
  background: var(--c-bg);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

/* =============================================
   Topic Hero
   ============================================= */
.topic-hero {
  background: linear-gradient(120deg, var(--c-ink) 60%, var(--c-ink-soft) 100%);
  padding: 52px 56px 52px 52px;
  position: relative;
  overflow: hidden;
}
.topic-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 32px;
  background: var(--c-bg);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}
.topic-hero__inner { position: relative; z-index: 1; max-width: 680px; }
.topic-hero__h1 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.25;
  margin: 8px 0 12px;
}
.topic-hero__desc {
  color: rgba(212,196,168,0.8);
  font-size: 1rem;
}

/* =============================================
   文章页头
   ============================================= */
.article-page {
  padding: 0;
}

.breadcrumb {
  padding: 16px 52px;
  font-size: 0.82rem;
  color: var(--c-ink-muted);
  background: var(--c-bg-warm);
  border-bottom: 1px solid var(--c-border);
}
.breadcrumb a {
  color: var(--c-ink-muted);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--c-primary); }

.article-header {
  background: var(--c-ink);
  padding: 48px 52px 52px;
  position: relative;
  overflow: hidden;
}
.article-hero {
  margin-bottom: 24px;
}
.article-hero__img {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
  border-radius: var(--radius-md);
  display: block;
}
.article-title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.25;
  margin-top: 10px;
  margin-bottom: 12px;
}
.article-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.article-meta__date,
.article-meta__mod {
  font-size: 0.82rem;
  color: rgba(212,196,168,0.65);
}

/* =============================================
   About / Privacy 页头
   ============================================= */
.about-header, .privacy-header {
  background: var(--c-ink);
  padding: 48px 52px 52px;
}
.about-title, .privacy-title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.25;
  margin-top: 8px;
  margin-bottom: 10px;
}
.about-lead {
  color: rgba(212,196,168,0.75);
  font-size: 1rem;
}
.privacy-update {
  color: rgba(212,196,168,0.6);
  font-size: 0.85rem;
}

/* =============================================
   内容区通用
   ============================================= */
.content-block {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 52px;
}

.content-block h2 {
  font-family: var(--font-head);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--c-ink);
  margin: 2em 0 0.6em;
  line-height: 1.3;
}
.content-block h3 {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--c-ink-soft);
  margin: 1.6em 0 0.5em;
}
.content-block p {
  margin-bottom: 1.1em;
  color: var(--c-ink);
}
.content-block a {
  color: var(--c-primary-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}
.content-block a:hover { color: var(--c-terracotta); }
.content-block ul, .content-block ol {
  padding-left: 1.5em;
  margin-bottom: 1.1em;
}
.content-block li { margin-bottom: 0.4em; }
.content-block strong { font-weight: 600; color: var(--c-ink); }
.content-block blockquote {
  border-left: 4px solid var(--c-primary);
  background: var(--c-aux-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5em 0;
  color: var(--c-ink-soft);
  font-style: italic;
}
.content-block img {
  max-width: 100%;
  border-radius: var(--radius-md);
  display: block;
  margin: 1.5em auto;
}
.content-block hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 2em 0;
}

/* =============================================
   眉题 & Section 标题
   ============================================= */
.eyebrow-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-primary);
  background: rgba(92,198,176,0.12);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--c-ink);
  margin-bottom: 24px;
  line-height: 1.3;
}

/* =============================================
   首页专区网格
   ============================================= */
.home-topics {
  padding: 40px 52px 0;
  max-width: 860px;
  margin: 0 auto;
}

.topic-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.topic-card {
  border-radius: var(--radius-md);
  overflow: hidden;
}
.topic-card__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-card);
  height: 100%;
}
.topic-card__link:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  border-color: var(--c-primary);
}
.topic-card__title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.35;
}
.topic-card__desc {
  font-size: 0.82rem;
  color: var(--c-ink-muted);
  line-height: 1.5;
  flex: 1;
}
.topic-card__cta {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-primary);
  margin-top: 4px;
}

/* =============================================
   首页文章卡片
   ============================================= */
.home-latest {
  padding: 0 52px 60px;
  max-width: 860px;
  margin: 0 auto;
}

.card-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  border-radius: var(--radius-md);
  overflow: hidden;
}
.card__inner {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-card);
  height: 100%;
}
.card__inner:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  border-color: var(--c-primary);
}
.card__eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--c-primary);
  letter-spacing: 0.06em;
}
.card__title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.35;
  display: block;
}
.card__desc {
  font-size: 0.82rem;
  color: var(--c-ink-muted);
  line-height: 1.5;
  flex: 1;
  display: block;
}
.card__date {
  font-size: 0.76rem;
  color: var(--c-sand);
  display: block;
}
.card__arrow {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-primary-dark);
  margin-top: 6px;
  display: block;
}

/* =============================================
   Topic 子页列表
   ============================================= */
.topic-children {
  max-width: 760px;
  margin: 0 auto;
  padding: 8px 52px 56px;
}

.topic-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.topic-item {
  border-radius: var(--radius-md);
  overflow: hidden;
}
.topic-item__link {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 20px;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-card);
}
.topic-item__link:hover {
  box-shadow: var(--shadow-hover);
  transform: translateX(4px);
  border-color: var(--c-primary);
}
.topic-item__num {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-aux);
  min-width: 44px;
  text-align: center;
  opacity: 0.6;
}
.topic-item__thumb {
  width: 80px;
  flex-shrink: 0;
}
.topic-item__img {
  width: 80px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  display: block;
}
.topic-item__body {
  flex: 1;
  min-width: 0;
}
.topic-item__title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ink);
  display: block;
  margin-bottom: 4px;
  line-height: 1.35;
}
.topic-item__desc {
  font-size: 0.82rem;
  color: var(--c-ink-muted);
  display: block;
  line-height: 1.45;
}
.topic-item__body time {
  display: block;
  font-size: 0.76rem;
  color: var(--c-sand);
  margin-top: 4px;
}

/* =============================================
   相关文章
   ============================================= */
.article-related {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 52px 40px;
  border-top: 1px solid var(--c-border);
}
.article-related .section-title { margin-top: 32px; }

.related-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.related-item a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 18px;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: box-shadow var(--transition), border-color var(--transition);
  box-shadow: 0 1px 4px rgba(23,38,35,0.06);
}
.related-item a:hover {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-hover);
}
.related-item__title {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-ink);
}
.related-item small {
  font-size: 0.78rem;
  color: var(--c-ink-muted);
}

/* =============================================
   返回链接 / About/Privacy 导航
   ============================================= */
.article-back,
.about-nav-links,
.privacy-nav-links {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 52px 56px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-primary-dark);
  text-decoration: none;
  padding: 8px 0;
  transition: color var(--transition);
}
.back-link:hover { color: var(--c-terracotta); }

/* =============================================
   About / Privacy 区块
   ============================================= */
.about-body, .privacy-body {
  padding-top: 40px;
}

/* =============================================
   Topic 简介
   ============================================= */
.topic-intro {
  padding-bottom: 24px;
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--c-ink);
  color: rgba(212,196,168,0.75);
  margin-left: 0;
}

.footer-top {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  flex-wrap: wrap;
  padding: 40px 52px 32px;
  border-bottom: 1px solid rgba(212,196,168,0.1);
  max-width: 900px;
}

.footer-brand {
  flex: 1;
  min-width: 180px;
}
.footer-brand strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.05rem;
  color: var(--c-primary);
  margin-bottom: 6px;
}
.footer-brand p {
  font-size: 0.82rem;
  line-height: 1.5;
}

.footer-subscribe {
  flex: 1;
  min-width: 220px;
}
.footer-subscribe__label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 10px;
  color: rgba(212,196,168,0.8);
}
.footer-subscribe__row {
  display: flex;
  gap: 8px;
}
.footer-subscribe__input {
  flex: 1;
  background: rgba(212,196,168,0.08);
  border: 1px solid rgba(212,196,168,0.2);
  border-radius: var(--radius-pill);
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--c-aux);
  outline: none;
  min-height: 42px;
  transition: border-color var(--transition);
}
.footer-subscribe__input::placeholder { color: rgba(212,196,168,0.35); }
.footer-subscribe__input:focus { border-color: var(--c-primary); }
.footer-subscribe__btn {
  background: var(--c-primary);
  color: var(--c-ink);
  border: none;
  border-radius: var(--radius-pill);
  padding: 10px 20px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  min-height: 42px;
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}
.footer-subscribe__btn:hover {
  background: var(--c-primary-dark);
  transform: scale(1.03);
}

.footer-cols {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  padding: 28px 52px 28px;
  border-bottom: 1px solid rgba(212,196,168,0.08);
  max-width: 900px;
}

.footer-dl {
  flex: 1;
  min-width: 130px;
}
.footer-dl dt {
  font-family: var(--font-head);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--c-primary);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  text-transform: uppercase;
}
.footer-dl dd {
  font-size: 0.82rem;
  margin-bottom: 6px;
  color: rgba(212,196,168,0.6);
}
.footer-dl dd a {
  color: rgba(212,196,168,0.6);
  text-decoration: none;
  transition: color var(--transition);
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 4px 0;
}
.footer-dl dd a:hover { color: var(--c-primary); }

.footer-bottom {
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
  padding: 16px 52px;
  font-size: 0.78rem;
  color: rgba(212,196,168,0.35);
}
.footer-bottom a {
  color: rgba(212,196,168,0.4);
  text-decoration: none;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition);
}
.footer-bottom a:hover { color: var(--c-primary); }

/* =============================================
   Scroll Reveal 动效
   ============================================= */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* =============================================
   移动端响应式
   ============================================= */
@media (max-width: 820px) {
  :root { --nav-width: 0px; }

  .site-wrap { flex-direction: column; }

  .site-header {
    position: static;
    width: 100%;
    height: auto;
    flex-direction: column;
    overflow: visible;
  }

  .site-header__brand { padding: 20px 18px 14px; }

  .site-nav {
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0 8px 10px;
    gap: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .nav-link {
    font-size: 0.82rem;
    padding: 10px 14px;
    border-left: none;
    border-bottom: 2px solid transparent;
    min-height: 44px;
    white-space: nowrap;
  }
  .nav-link--active {
    border-left: none;
    border-bottom-color: var(--c-primary);
  }
  .nav-link:hover {
    border-left: none;
    border-bottom-color: var(--c-primary);
  }

  .page-body { margin-left: 0; }

  .hero--home {
    padding: 36px 24px 64px;
    justify-content: center;
    min-height: 42vh;
  }
  .hero__text { text-align: center; max-width: 100%; }
  .hero__media { display: none; }

  .topic-hero { padding: 36px 24px 44px; }
  .article-header { padding: 32px 24px 40px; }
  .about-header, .privacy-header { padding: 32px 24px 40px; }
  .breadcrumb { padding: 12px 20px; }

  .content-block { padding: 32px 24px; }

  .home-topics { padding: 32px 20px 0; }
  .home-latest { padding: 0 20px 48px; }
  .topic-children { padding: 8px 20px 48px; }

  .article-related { padding: 0 20px 32px; }
  .article-back,
  .about-nav-links,
  .privacy-nav-links { padding: 20px 20px 40px; }

  .footer-top { padding: 32px 20px 24px; flex-direction: column; }
  .footer-cols { padding: 20px 20px 20px; }
  .footer-bottom { padding: 14px 20px; }

  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .card-grid { grid-template-columns: 1fr; }

  .footer-dl dd a { min-height: 40px; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .hero__h1 { font-size: 1.6rem; }
  .topic-hero__h1 { font-size: 1.5rem; }
  .topic-grid { grid-template-columns: 1fr; }
  .footer-cols { flex-direction: column; }
  .footer-subscribe__row { flex-direction: column; }
  .footer-subscribe__btn { width: 100%; justify-content: center; }
  .topic-item__link { flex-wrap: wrap; }
}

/* =============================================
   工具
   ============================================= */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}