@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Syncopate:wght@400;700&display=swap');

/* ── 设计令牌 ── */
:root {
  --clr-ink: #1f1726;
  --clr-purple: #56228b;
  --clr-brown: #8b4513;
  --clr-surface: #2a1e36;
  --clr-surface2: #332446;
  --clr-border: rgba(86,34,139,0.35);
  --clr-text: #e8dff5;
  --clr-muted: #b09ec5;
  --clr-accent: #c084fc;
  --clr-warm: #d4845a;
  --font-mono: 'Space Mono', 'Courier New', monospace;
  --font-display: 'Syncopate', sans-serif;
  --nav-w: 240px;
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 24px;
  --shadow-soft: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glass: 0 2px 16px rgba(86,34,139,0.2);
  --transition: 0.25s ease;
}

/* ── 重置 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--clr-ink);
  color: var(--clr-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; border-radius: var(--r-sm); }
a { color: var(--clr-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--clr-warm); }
a:focus-visible { outline: 2px solid var(--clr-accent); outline-offset: 3px; border-radius: 4px; }
ul, ol { list-style: none; }
h1,h2,h3,h4 { line-height: 1.3; font-family: var(--font-display); }

/* ── 布局：左侧固定导航 + 右侧页面主体 ── */
.site-shell {
  display: flex;
  min-height: 100vh;
}

/* ── 侧边导航 ── */
.side-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  background: var(--clr-surface);
  border-right: 1px solid var(--clr-border);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  z-index: 100;
  padding-bottom: 2rem;
}

.nav-announcement {
  background: var(--clr-purple);
  color: #fff;
  font-size: 0.72rem;
  font-family: var(--font-display);
  letter-spacing: 0.08em;
  padding: 0.5rem 1rem;
  text-align: center;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
}

.nav-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 1.2rem 1rem 0.8rem;
  border-bottom: 1px solid var(--clr-border);
}

.nav-logo { width: 36px; height: 36px; border-radius: 8px; }

.nav-brand-name {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--clr-text);
  line-height: 1.3;
  letter-spacing: 0.04em;
}
.nav-brand-name:hover { color: var(--clr-accent); }

.side-nav > ol {
  padding: 0.8rem 0;
  flex: 1;
}

.side-nav > ol > li > a {
  display: block;
  padding: 0.6rem 1rem;
  font-size: 0.8rem;
  color: var(--clr-muted);
  line-height: 1.4;
  border-left: 3px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.side-nav > ol > li > a:hover,
.side-nav > ol > li > a[aria-current="page"] {
  color: var(--clr-text);
  border-left-color: var(--clr-purple);
  background: rgba(86,34,139,0.15);
}

/* ── 页面主体 ── */
.page-body {
  margin-left: var(--nav-w);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  padding: 2rem 2.5rem;
  max-width: 1100px;
  width: 100%;
}

/* ── section 基础 ── */
section {
  margin-bottom: 3rem;
}

/* ── Hero（首页） ── */
.hero-section {
  min-height: 45vh;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  gap: 1rem 2rem;
  align-items: center;
  padding: 2rem 0 1.5rem;
  position: relative;
  overflow: hidden;
}

.hero-blob {
  grid-column: 2;
  grid-row: 1 / 3;
  justify-self: end;
  align-self: center;
  margin: 0;
  opacity: 0.7;
}

.hero-aside {
  grid-column: 1;
  grid-row: 1;
}

.hero-text {
  grid-column: 1;
  grid-row: 2;
}

.hero-text h1 {
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  color: #fff;
  margin-bottom: 0.75rem;
}

.hero-desc {
  font-size: 1rem;
  color: var(--clr-muted);
  max-width: 520px;
}

/* ── eyebrow / tag chips ── */
.eyebrow-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-family: var(--font-display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-warm);
  border: 1px solid var(--clr-brown);
  border-radius: var(--r-lg);
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.5rem;
}

.tag-chip {
  display: inline-block;
  font-size: 0.72rem;
  color: var(--clr-muted);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  padding: 0.2rem 0.6rem;
  transition: color var(--transition), border-color var(--transition);
}
.tag-chip:hover { color: var(--clr-accent); border-color: var(--clr-purple); }

.tag-chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.5rem; }

/* ── subtitle / subhead ── */
p.subtitle, p.subhead, p.desc, p.lead {
  color: var(--clr-muted);
  font-size: 0.95rem;
  margin-top: 0.4rem;
  margin-bottom: 1rem;
}

/* ── 装饰线 ── */
.deco-line { margin: 0.5rem 0 1.5rem; }

/* ── h2 装饰 ── */
h2 {
  font-size: clamp(1.2rem, 2.5vw, 1.75rem);
  color: var(--clr-text);
  margin-bottom: 0.25rem;
  position: relative;
  padding-left: 0.8rem;
}
h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.2em;
  height: 0.7em;
  width: 3px;
  background: var(--clr-purple);
  border-radius: 2px;
}

/* ── 玻璃卡片 ── */
.glass-card {
  background: rgba(42,30,54,0.65);
  border: 1px solid var(--clr-border);
  border-radius: 4px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: var(--shadow-glass);
  padding: 1.25rem 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(86,34,139,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.glass-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(86,34,139,0.3);
}

.card h3 { font-size: 0.95rem; color: var(--clr-text); margin-bottom: 0.4rem; }
.card h3 a { color: inherit; }
.card h3 a:hover { color: var(--clr-accent); }
.card p { font-size: 0.85rem; color: var(--clr-muted); line-height: 1.5; }
.card-count { font-size: 0.72rem; color: var(--clr-warm); margin-top: 0.5rem; display: block; }
.card-date { font-size: 0.72rem; color: var(--clr-brown); display: block; margin-top: 0.5rem; }
.card-sm { padding: 0.9rem 1.1rem; }

.card-inner { flex: 1; }
.child-card { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.card-arrow { color: var(--clr-purple); font-size: 1rem; flex-shrink: 0; }

/* ── 话题网格 ── */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

/* ── 最新文章网格 ── */
.recent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

/* ── 子页列表（topic 页） ── */
.child-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* ── 相关文章列表 ── */
.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

/* ── 左侧 aside + 内容 双列布局 ── */
.content-section,
.topic-content-section,
.article-body-section,
.tag-content-section,
.about-body-section,
.privacy-body-section {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  align-items: start;
}

.content-aside-left,
.article-sidebar {
  position: sticky;
  top: 1rem;
}

/* ── aside 通用样式 ── */
.aside-label {
  display: block;
  font-size: 0.68rem;
  font-family: var(--font-display);
  letter-spacing: 0.1em;
  color: var(--clr-brown);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--clr-border);
}

.aside-count { font-size: 0.8rem; color: var(--clr-muted); margin-bottom: 0.6rem; }

.content-aside-left ul,
.article-sidebar ul,
.article-sidebar nav ul,
.privacy-aside ul,
.about-aside ul,
.tag-aside ul {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.content-aside-left ul li a,
.article-sidebar ul li a,
.article-sidebar nav ul li a,
.privacy-aside ul li a,
.about-aside ul li a,
.tag-aside ul li a {
  display: block;
  font-size: 0.8rem;
  color: var(--clr-muted);
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(86,34,139,0.12);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.content-aside-left ul li a:hover,
.article-sidebar ul li a:hover,
.article-sidebar nav ul li a:hover { color: var(--clr-accent); }

.sidebar-block { margin-top: 1.5rem; }
.sidebar-topic-link { display: inline-block; font-size: 0.8rem; color: var(--clr-warm); margin-top: 0.75rem; }

.toc-list { display: flex; flex-direction: column; gap: 0; }
.toc-list li a { display: block; font-size: 0.78rem; color: var(--clr-muted); padding: 0.3rem 0; border-bottom: 1px solid rgba(86,34,139,0.1); min-height: 36px; display: flex; align-items: center; }
.toc-list li a:hover { color: var(--clr-accent); }

/* ── Hero sections（各页面） ── */
.topic-hero-section,
.article-header-section,
.tag-header-section,
.about-header-section,
.privacy-header-section {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.5rem 0 1rem;
  position: relative;
}

.topic-hero-text,
.article-title-block,
.tag-title-block,
.about-title-block,
.privacy-title-block {
  grid-column: 1;
}

.topic-blob,
.article-hero-figure,
.tag-blob,
.about-blob,
.privacy-blob {
  grid-column: 2;
  grid-row: 1 / 3;
  align-self: center;
  margin: 0;
}

.topic-aside,
.article-meta-aside,
.tag-aside,
.about-aside,
.privacy-aside {
  grid-column: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.4rem);
  color: #fff;
  margin: 0.5rem 0 0.5rem;
}

.page-date {
  font-size: 0.75rem;
  color: var(--clr-brown);
  display: block;
}

.date-modified { font-size: 0.75rem; color: var(--clr-muted); display: block; }

.breadcrumb-link {
  font-size: 0.78rem;
  color: var(--clr-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  min-height: 40px;
}

.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* ── 文章英雄图 ── */
.article-hero-figure img.hero-img {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: var(--r-lg);
}
.article-hero-deco { opacity: 0.6; }

/* ── prose 正文 ── */
.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--clr-text);
  max-width: 720px;
}
.prose h2 { margin-top: 2rem; margin-bottom: 0.5rem; }
.prose h3 { font-family: var(--font-mono); font-size: 1rem; color: var(--clr-accent); margin-top: 1.5rem; margin-bottom: 0.4rem; }
.prose p { margin-bottom: 1rem; }
.prose ul, .prose ol { margin: 0.75rem 0 1rem 1.5rem; list-style: disc; display: flex; flex-direction: column; gap: 0.3rem; }
.prose ol { list-style: decimal; }
.prose li { padding-left: 0.25rem; }
.prose strong { color: var(--clr-accent); }
.prose a { color: var(--clr-warm); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--clr-accent); }
.prose blockquote { border-left: 3px solid var(--clr-purple); padding-left: 1rem; color: var(--clr-muted); font-style: italic; margin: 1rem 0; }
.prose code { font-family: var(--font-mono); font-size: 0.88em; background: rgba(86,34,139,0.2); padding: 0.1em 0.35em; border-radius: 4px; }
.prose table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
.prose th { background: var(--clr-surface2); color: var(--clr-text); padding: 0.6rem 0.8rem; text-align: left; border-bottom: 2px solid var(--clr-purple); }
.prose td { padding: 0.5rem 0.8rem; border-bottom: 1px solid var(--clr-border); }

.article-footer-date { font-size: 0.78rem; color: var(--clr-muted); margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--clr-border); }

/* ── 各 section 中的 aside 辅助 ── */
.hero-aside { grid-column: 1; grid-row: 1; }
.aside-nav { margin-top: 0.75rem; }
.aside-nav ul { display: flex; flex-direction: column; }
.aside-nav ul li a { font-size: 0.8rem; color: var(--clr-muted); display: flex; align-items: center; min-height: 40px; }
.aside-nav ul li a:hover { color: var(--clr-accent); }

.section-aside,
.recent-aside,
.related-aside,
.topics-aside,
.privacy-cta-aside,
.topic-aside {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.topics-section,
.recent-section,
.children-section,
.tag-articles-section,
.about-topics-section {
  position: relative;
}

/* ── 按钮 ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.6rem 1.4rem;
  background: var(--clr-purple);
  color: #fff;
  border-radius: var(--r-md);
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.btn-primary:hover { background: #6f32b0; color: #fff; transform: translateY(-1px); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--clr-purple);
  color: var(--clr-accent);
  border-radius: var(--r-md);
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  transition: background var(--transition), color var(--transition);
}
.btn-outline:hover { background: rgba(86,34,139,0.2); color: #fff; }

/* ── 页脚 ── */
.site-footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: 2.5rem 2.5rem 1rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr 1.2fr 0.8fr;
  gap: 2rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--clr-border);
}

.footer-col h3 {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--clr-brown);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.footer-col strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--clr-text);
  margin-bottom: 0.5rem;
}
.footer-col p { font-size: 0.82rem; color: var(--clr-muted); line-height: 1.6; margin-bottom: 0.5rem; }
.footer-col a { font-size: 0.82rem; color: var(--clr-muted); }
.footer-col a:hover { color: var(--clr-accent); }

.footer-contact address { font-style: normal; margin-bottom: 1rem; }
.footer-links ul { display: flex; flex-direction: column; gap: 0; }
.footer-links ul li a { display: flex; align-items: center; min-height: 40px; font-size: 0.82rem; color: var(--clr-muted); border-bottom: 1px solid rgba(86,34,139,0.1); }
.footer-links ul li a:hover { color: var(--clr-accent); }

/* 订阅表单 */
.subscribe-form label { display: block; font-size: 0.75rem; color: var(--clr-muted); margin-bottom: 0.4rem; font-family: var(--font-display); letter-spacing: 0.06em; }
.form-row { display: flex; gap: 0.5rem; }
.form-row input[type="email"] {
  flex: 1;
  min-width: 0;
  background: var(--clr-ink);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-sm);
  color: var(--clr-text);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.5rem 0.75rem;
  min-height: 40px;
  outline: none;
  transition: border-color var(--transition);
}
.form-row input[type="email"]:focus { border-color: var(--clr-purple); }
.form-row button {
  background: var(--clr-purple);
  color: #fff;
  border: none;
  border-radius: var(--r-sm);
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 0 0.9rem;
  min-height: 40px;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}
.form-row button:hover { background: #6f32b0; }

/* 底栏 */
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-copy { font-size: 0.75rem; color: var(--clr-muted); }
.footer-bottom-links { display: flex; gap: 1rem; }
.footer-bottom-links li a { font-size: 0.75rem; color: var(--clr-muted); min-height: 40px; display: flex; align-items: center; }
.footer-bottom-links li a:hover { color: var(--clr-accent); }

/* ── Stagger + Scroll Reveal 动效 ── */
@media (prefers-reduced-motion: no-preference) {
  .reveal-item {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease calc(var(--i, 0) * 0.08s), transform 0.5s ease calc(var(--i, 0) * 0.08s);
  }
  .reveal-item.visible {
    opacity: 1;
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .reveal-item { opacity: 1; transform: none; transition: none; }
}

/* ── 手机端 ── */
@media (max-width: 768px) {
  :root { --nav-w: 0px; }

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

  .side-nav {
    position: relative;
    width: 100%;
    height: auto;
    flex-direction: column;
    border-right: none;
    border-bottom: 1px solid var(--clr-border);
    overflow-y: visible;
  }

  .side-nav > ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    padding: 0.5rem;
  }

  .side-nav > ol > li > a {
    border-left: none;
    border-bottom: 2px solid transparent;
    font-size: 0.75rem;
    padding: 0.5rem 0.6rem;
    min-height: 44px;
  }
  .side-nav > ol > li > a:hover,
  .side-nav > ol > li > a[aria-current="page"] {
    border-left: none;
    border-bottom-color: var(--clr-purple);
    background: rgba(86,34,139,0.1);
  }

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

  main { padding: 1.25rem 1rem; }

  .hero-section {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    min-height: auto;
  }
  .hero-blob { grid-column: 1; grid-row: 1; justify-self: end; }
  .hero-aside { grid-row: 2; }
  .hero-text { grid-row: 3; }

  .topic-hero-section,
  .article-header-section,
  .tag-header-section,
  .about-header-section,
  .privacy-header-section {
    grid-template-columns: 1fr;
  }
  .topic-blob,
  .article-hero-figure,
  .tag-blob,
  .about-blob,
  .privacy-blob { display: none; }

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

  .content-aside-left,
  .article-sidebar {
    position: static;
    background: var(--clr-surface);
    border-radius: var(--r-sm);
    padding: 1rem;
    border: 1px solid var(--clr-border);
  }

  .topic-grid,
  .recent-grid,
  .related-list {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer { padding: 1.5rem 1rem 1rem; }
}

@media (max-width: 480px) {
  h1 { font-size: 1.4rem; }
  h2 { font-size: 1.15rem; }
  .prose { font-size: 0.95rem; }
  main { padding: 1rem 0.85rem; }
}