@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,600;0,700;0,800;1,400&display=swap');

/* =====================
   CSS 自定义属性
   ===================== */
:root {
  --clr-primary: #56228b;
  --clr-secondary: #8b4513;
  --clr-bg: #1f1726;
  --clr-bg2: #2a1e35;
  --clr-bg3: #261920;
  --clr-surface: #2e2040;
  --clr-surface2: #352430;
  --clr-border: rgba(86,34,139,0.25);
  --clr-border2: rgba(139,69,19,0.2);
  --clr-text: #e8ddf5;
  --clr-text-muted: #b09ec8;
  --clr-text-dim: #8a7aa0;
  --clr-accent-light: #a06cd5;
  --clr-warm-light: #c47a3a;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-soft: 0 4px 24px rgba(86,34,139,0.18), 0 1px 6px rgba(0,0,0,0.25);
  --shadow-card: 0 6px 32px rgba(86,34,139,0.22), 0 2px 8px rgba(0,0,0,0.3);
  --font-main: 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --max-w: 1140px;
  --nav-h: 64px;
  --anchor-h: 44px;
  --transition: 0.22s ease;
}

/* =====================
   Reset & Base
   ===================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.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;
}

a { color: var(--clr-accent-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--clr-warm-light); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }

/* =====================
   Site Wrapper
   ===================== */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =====================
   Header / Nav
   ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(31,23,38,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  height: var(--nav-h);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-mark { width: 32px; height: 32px; border-radius: 8px; }

.brand-name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--clr-text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.primary-nav::-webkit-scrollbar { display: none; }

.nav-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover,
.nav-link.active {
  background: rgba(86,34,139,0.18);
  color: var(--clr-accent-light);
}

.nav-search { flex-shrink: 0; }

.search-input {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  color: var(--clr-text);
  font-family: var(--font-main);
  font-size: 0.82rem;
  padding: 8px 16px;
  width: 180px;
  outline: none;
  transition: border-color var(--transition), width var(--transition);
}
.search-input:focus {
  border-color: var(--clr-primary);
  width: 220px;
}
.search-input::placeholder { color: var(--clr-text-dim); }

/* =====================
   Sticky Anchor Bar
   ===================== */
.sticky-anchor-bar {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: rgba(42,30,53,0.97);
  border-bottom: 1px solid var(--clr-border2);
  backdrop-filter: blur(8px);
}

.anchor-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--anchor-h);
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.anchor-inner::-webkit-scrollbar { display: none; }

.anchor-label {
  font-size: 0.78rem;
  color: var(--clr-text-dim);
  flex-shrink: 0;
  font-weight: 600;
}

.anchor-link {
  font-size: 0.78rem;
  color: var(--clr-text-muted);
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid var(--clr-border);
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--transition);
}
.anchor-link:hover {
  background: rgba(86,34,139,0.2);
  border-color: var(--clr-primary);
  color: var(--clr-accent-light);
}

/* =====================
   Buttons
   ===================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--clr-primary), #7b3ab0);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 28px;
  border-radius: var(--radius-lg);
  min-height: 44px;
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(86,34,139,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(86,34,139,0.55);
  color: #fff;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--clr-text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 11px 24px;
  border-radius: var(--radius-lg);
  min-height: 44px;
  border: 1.5px solid var(--clr-border);
  transition: all var(--transition);
  text-decoration: none;
}
.btn-ghost:hover {
  border-color: var(--clr-accent-light);
  color: var(--clr-accent-light);
  background: rgba(86,34,139,0.1);
}

/* =====================
   Hero Section (Home)
   ===================== */
.hero-section {
  position: relative;
  overflow: hidden;
  min-height: 45vh;
  display: flex;
  align-items: center;
  background: var(--clr-bg);
}

.hero-arc-bg {
  width: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-blob {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 72px 24px 96px;
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: rgba(86,34,139,0.3);
  border: 1px solid rgba(86,34,139,0.5);
  color: var(--clr-accent-light);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-content h1 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--clr-text-muted);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* =====================
   Sections general
   ===================== */
.content-section,
.topics-section,
.recent-section,
.intro-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px 24px;
  width: 100%;
}

.section-sub {
  color: var(--clr-text-muted);
  margin-bottom: 32px;
  font-size: 0.98rem;
}

h2 { font-size: 1.45rem; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }

h2 > span, h3 > span { color: inherit; }

/* =====================
   Intro div (Home)
   ===================== */
.intro-section {
  display: grid;
  grid-template-columns: 120px 220px 1fr;
  gap: 32px;
  align-items: start;
}

.section-deco, .intro-aside, .intro-body { }

.intro-aside {
  padding: 24px;
  background: var(--clr-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
}

.aside-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-accent-light);
  margin-top: 10px;
}

.intro-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--clr-text);
}

/* =====================
   Topics Grid (Home)
   ===================== */
.topics-section { text-align: center; }

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 32px;
  text-align: left;
}

.topic-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}
.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(86,34,139,0.3);
}

.topic-card h3 { color: var(--clr-accent-light); margin-bottom: 8px; }
.topic-card p { font-size: 0.88rem; color: var(--clr-text-muted); margin-bottom: 12px; line-height: 1.6; }
.topic-card small { font-size: 0.76rem; color: var(--clr-text-dim); display: block; margin-top: 8px; }

.card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-warm-light);
}
.card-link:hover { color: var(--clr-secondary); }

/* =====================
   Recent div (Home)
   ===================== */
.recent-section {
  display: grid;
  grid-template-columns: 220px 80px 1fr;
  gap: 32px;
  align-items: start;
  background: var(--clr-bg2);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  max-width: var(--max-w);
  margin: 0 auto 40px;
}

.recent-aside h2 { margin-bottom: 10px; }
.recent-aside p { font-size: 0.88rem; color: var(--clr-text-muted); margin-bottom: 14px; }

.recent-list { width: 100%; }

.article-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--clr-border);
}
.article-item:last-child { border-bottom: none; }
.article-item a { font-size: 0.95rem; font-weight: 600; color: var(--clr-text); flex: 1; }
.article-item a:hover { color: var(--clr-accent-light); }
.article-item small { font-size: 0.78rem; color: var(--clr-text-dim); white-space: nowrap; flex-shrink: 0; }

/* =====================
   Topic Layout
   ===================== */
.topic-layout,
.article-layout,
.about-layout,
.privacy-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  flex: 1;
}

/* =====================
   Sidebar (left)
   ===================== */
.topic-sidebar,
.article-sidebar,
.about-sidebar,
.privacy-sidebar {
  padding: 32px 0 32px;
  border-right: 1px solid var(--clr-border);
  padding-right: 24px;
  position: sticky;
  top: calc(var(--nav-h) + var(--anchor-h, 0px));
  align-self: start;
  max-height: calc(100vh - var(--nav-h) - 60px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--clr-border) transparent;
}

.about-sidebar,
.privacy-sidebar {
  top: var(--nav-h);
}

.sidebar-block {
  margin-bottom: 28px;
}

.sidebar-block h2,
.sidebar-block h3 {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  font-weight: 700;
  margin-bottom: 12px;
}

.sidebar-links { display: flex; flex-direction: column; gap: 4px; }

.sidebar-links li a {
  font-size: 0.87rem;
  color: var(--clr-text-muted);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  display: block;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: all var(--transition);
  line-height: 1.4;
}
.sidebar-links li a:hover,
.sidebar-links li a.active {
  background: rgba(86,34,139,0.15);
  color: var(--clr-accent-light);
}

.parent-link {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--clr-warm-light);
  display: block;
  margin-bottom: 12px;
}

.sidebar-meta { font-size: 0.82rem; color: var(--clr-text-dim); }

.sidebar-brand-block p { font-size: 0.85rem; color: var(--clr-text-muted); line-height: 1.6; }

/* =====================
   Topic Main
   ===================== */
.topic-main,
.article-main,
.about-main,
.privacy-main {
  padding: 32px 0 32px 32px;
  min-width: 0;
}

.topic-eyebrow,
.about-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-warm-light);
  margin-bottom: 10px;
}

.topic-hero-section,
.about-header-section,
.privacy-header-section,
.article-header-section {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--clr-border);
}

.topic-hero-section h1,
.about-header-section h1,
.privacy-header-section h1,
.article-header-section h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  margin-bottom: 10px;
}

.page-date {
  font-size: 0.82rem;
  color: var(--clr-text-dim);
  display: block;
  margin-top: 8px;
}

.topic-deco,
.about-deco,
.privacy-deco,
.article-deco,
.section-deco,
.body-deco,
.content-deco,
.nav-deco,
.recent-deco,
.content-flow-deco,
.privacy-side-deco {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
  opacity: 0.8;
}

/* =====================
   Topic Content Section
   ===================== */
.topic-content-section,
.about-content-section,
.privacy-content-section,
.article-body-section {
  display: grid;
  grid-template-columns: 180px 50px 1fr;
  gap: 24px;
  align-items: start;
  margin-bottom: 40px;
}

.content-aside,
.about-stat-aside,
.privacy-toc-aside,
.toc-aside {
  background: var(--clr-surface2);
  border-radius: var(--radius-md);
  padding: 18px;
  border: 1px solid var(--clr-border2);
}

.content-aside h3,
.about-stat-aside h3,
.privacy-toc-aside h3,
.toc-aside h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-text-dim);
  margin-bottom: 8px;
}
.content-aside p,
.toc-aside .toc-desc { font-size: 0.85rem; color: var(--clr-text-muted); }

.stat-list { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.stat-list li { display: flex; flex-direction: column; }
.stat-list li strong { font-size: 1.6rem; font-weight: 800; color: var(--clr-accent-light); line-height: 1; }
.stat-list li span { font-size: 0.78rem; color: var(--clr-text-dim); }

.topic-body,
.about-body,
.privacy-body,
.article-content {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--clr-text);
  min-width: 0;
}

.topic-body p,
.about-body p,
.privacy-body p,
.article-content p { margin-bottom: 18px; }

.topic-body h2,
.about-body h2,
.privacy-body h2,
.article-content h2 {
  font-size: 1.3rem;
  margin: 32px 0 12px;
  color: var(--clr-accent-light);
}

.topic-body h3,
.about-body h3,
.privacy-body h3,
.article-content h3 {
  font-size: 1.1rem;
  margin: 24px 0 10px;
  color: var(--clr-warm-light);
}

.topic-body ul,
.about-body ul,
.privacy-body ul,
.article-content ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 16px;
}
.topic-body ul li,
.about-body ul li,
.privacy-body ul li,
.article-content ul li { margin-bottom: 6px; }

.topic-body ol,
.about-body ol,
.privacy-body ol,
.article-content ol {
  list-style: decimal;
  padding-left: 20px;
  margin-bottom: 16px;
}

/* =====================
   Child Articles (Topic)
   ===================== */
.child-articles-section {
  margin-top: 8px;
}
.child-articles-section h2 { margin-bottom: 20px; }

.child-list { display: flex; flex-direction: column; gap: 12px; }

.child-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: all var(--transition);
}
.child-item:hover { border-color: var(--clr-primary); transform: translateX(4px); }

.child-num {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--clr-primary);
  opacity: 0.6;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.child-info { flex: 1; min-width: 0; }
.child-info a { font-size: 1rem; font-weight: 700; color: var(--clr-text); display: block; margin-bottom: 4px; }
.child-info a:hover { color: var(--clr-accent-light); }
.child-info small { font-size: 0.82rem; color: var(--clr-text-dim); line-height: 1.5; display: block; }

/* =====================
   Article Layout specifics
   ===================== */
.article-meta-aside {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--clr-text-dim);
  margin-bottom: 12px;
}

.breadcrumb-link { color: var(--clr-warm-light); font-weight: 600; }
.meta-sep { opacity: 0.4; }
.meta-current { color: var(--clr-text-dim); }

.article-meta {
  display: flex;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--clr-text-dim);
  margin-top: 8px;
  flex-wrap: wrap;
}

.toc-related { margin-top: 12px; }
.toc-related strong { font-size: 0.78rem; color: var(--clr-text-dim); display: block; margin-bottom: 6px; }
.toc-related ul { display: flex; flex-direction: column; gap: 4px; }
.toc-related ul li a { font-size: 0.82rem; color: var(--clr-text-muted); }
.toc-related ul li a:hover { color: var(--clr-accent-light); }

/* =====================
   Article nav (pager)
   ===================== */
.article-nav-section {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--clr-border);
}

.pager-aside {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.pager-btn {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  padding: 10px 16px;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: all var(--transition);
  max-width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pager-btn:hover { border-color: var(--clr-primary); color: var(--clr-accent-light); background: rgba(86,34,139,0.1); }

/* =====================
   About topics list
   ===================== */
.about-topics-section { margin-top: 8px; }
.about-topics-section h2 { margin-bottom: 20px; }

.about-topic-list { display: flex; flex-direction: column; gap: 12px; }
.about-topic-list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.about-topic-list li:hover { border-color: var(--clr-primary); }
.about-topic-list li a { font-size: 1rem; font-weight: 700; color: var(--clr-text); }
.about-topic-list li a:hover { color: var(--clr-accent-light); }
.about-topic-list li small { font-size: 0.83rem; color: var(--clr-text-dim); }

/* =====================
   Footer
   ===================== */
.site-footer {
  margin-top: auto;
  background: var(--clr-bg);
  border-top: 1px solid var(--clr-border);
}

.footer-cta {
  background: linear-gradient(135deg, var(--clr-bg2), var(--clr-bg3));
  text-align: center;
  padding: 56px 24px;
  border-bottom: 1px solid var(--clr-border);
}

.footer-cta h2 {
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 12px;
}

.footer-cta p {
  color: var(--clr-text-muted);
  margin-bottom: 24px;
  font-size: 0.98rem;
}

.footer-nav-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px;
}

.footer-dl {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 32px;
  align-items: baseline;
}

.footer-dl dt {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  width: 100%;
  margin-top: 16px;
}
.footer-dl dt:first-child { margin-top: 0; }

.footer-dl dd a {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  padding: 6px 0;
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  transition: color var(--transition);
}
.footer-dl dd a:hover { color: var(--clr-accent-light); }

.footer-copy {
  border-top: 1px solid var(--clr-border);
  padding: 18px 24px;
  text-align: center;
}
.footer-copy p { font-size: 0.82rem; color: var(--clr-text-dim); }

/* =====================
   Organic decorative blobs
   ===================== */
.section-deco svg,
.topic-deco svg,
.about-deco svg,
.privacy-deco svg,
.article-deco svg,
.body-deco svg,
.content-deco svg,
.nav-deco svg,
.recent-deco svg,
.content-flow-deco svg,
.privacy-side-deco svg {
  pointer-events: none;
  user-select: none;
}

/* =====================
   Scrollbar (sidebar)
   ===================== */
.topic-sidebar::-webkit-scrollbar,
.article-sidebar::-webkit-scrollbar,
.about-sidebar::-webkit-scrollbar,
.privacy-sidebar::-webkit-scrollbar {
  width: 4px;
}
.topic-sidebar::-webkit-scrollbar-track,
.article-sidebar::-webkit-scrollbar-track,
.about-sidebar::-webkit-scrollbar-track,
.privacy-sidebar::-webkit-scrollbar-track {
  background: transparent;
}
.topic-sidebar::-webkit-scrollbar-thumb,
.article-sidebar::-webkit-scrollbar-thumb,
.about-sidebar::-webkit-scrollbar-thumb,
.privacy-sidebar::-webkit-scrollbar-thumb {
  background: var(--clr-border);
  border-radius: 4px;
}

/* =====================
   Privacy specific
   ===================== */
.privacy-notice-aside {
  background: rgba(139,69,19,0.12);
  border: 1px solid rgba(139,69,19,0.25);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--clr-warm-light);
  margin-bottom: 16px;
}

/* =====================
   Animations / Hover micro-interactions
   ===================== */
@media (prefers-reduced-motion: no-preference) {
  .topic-card {
    animation: fadeUp 0.5s ease both;
  }
  .child-item {
    animation: fadeUp 0.4s ease both;
  }
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* =====================
   Responsive — Tablet 768px
   ===================== */
@media (max-width: 900px) {
  .intro-section {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .section-deco { display: none; }

  .recent-section {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .recent-deco { display: none; }

  .topic-layout,
  .article-layout,
  .about-layout,
  .privacy-layout {
    grid-template-columns: 1fr;
    padding: 0 16px;
  }

  .topic-sidebar,
  .article-sidebar,
  .about-sidebar,
  .privacy-sidebar {
    position: static;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--clr-border);
    padding-right: 0;
    padding-bottom: 20px;
  }

  .topic-main,
  .article-main,
  .about-main,
  .privacy-main {
    padding-left: 0;
  }

  .topic-content-section,
  .about-content-section,
  .privacy-content-section,
  .article-body-section {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .content-deco,
  .body-deco,
  .content-flow-deco,
  .privacy-side-deco { display: none; }

  .footer-dl { flex-direction: column; gap: 0; }
}

/* =====================
   Responsive — Mobile 375px
   ===================== */
@media (max-width: 600px) {
  html { font-size: 16px; }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .primary-nav { gap: 2px; }

  .nav-link {
    font-size: 0.75rem;
    padding: 8px 8px;
  }

  .brand-name { font-size: 0.85rem; }

  .search-input { width: 120px; }
  .search-input:focus { width: 150px; }

  .hero-content { padding: 48px 16px 72px; }
  .hero-content h1 { font-size: 1.6rem; }

  .topics-grid { grid-template-columns: 1fr; }

  .content-section,
  .topics-section,
  .recent-section {
    padding: 32px 16px;
  }

  .recent-section { margin: 0 16px 24px; }

  .child-item { flex-direction: column; gap: 8px; }
  .child-num { font-size: 0.7rem; }

  .article-nav-section { grid-template-columns: 1fr; }
  .nav-deco { display: none; }

  .pager-btn { max-width: 100%; font-size: 0.82rem; }

  .footer-cta { padding: 40px 16px; }
  .footer-nav-section { padding: 28px 16px; }

  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-ghost { width: 100%; max-width: 280px; }

  .anchor-inner { padding: 0 16px; }
}