/* =============================================
   触手H文化站 — 深海墨蓝主题 stylesheet
   目标：学术杂志感、荧光青线条、紧凑排版
   ============================================= */

/* ---------- 自定义属性 ---------- */
:root {
  --ink:       #0A1628;
  --ink-mid:   #1A2E4A;
  --ink-light: #243d60;
  --glow:      #00E5CC;
  --glow-dim:  #00b09e;
  --glow-faint:#003d36;
  --text-main: #d4e8f0;
  --text-mute: #7fa8be;
  --text-head: #e8f6fa;
  --ff-serif:  'Noto Serif SC', Georgia, 'Times New Roman', serif;
  --ff-mono:   'IBM Plex Mono', 'Courier New', Courier, monospace;
  --ff-sans:   'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --side-w:    240px;
  --main-max:  740px;
  --gap:       1.5rem;
  --r-sm:      3px;
}

/* ---------- 基础重置（逻辑属性优先）---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  font-family: var(--ff-mono);
  background-color: var(--ink);
  scrollbar-color: var(--glow-dim) var(--ink-mid);
  -webkit-text-size-adjust: 100%;
}

body {
  min-block-size: 100dvb;
  background-color: var(--ink);
  color: var(--text-main);
  font-size: clamp(1rem, 1.5vw + 0.5rem, 1.125rem);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 图片 ---------- */
img {
  max-inline-size: 100%;
  block-size: auto;
  vertical-align: middle;
  object-fit: cover;
}

/* ---------- 链接 ---------- */
a {
  color: var(--glow);
  text-underline-offset: 3px;
  text-decoration-color: transparent;
  transition: text-decoration-color 0.18s, color 0.18s;
}
a:hover, a:focus-visible {
  text-decoration-color: var(--glow);
  color: #fff;
  outline: none;
}
a:focus-visible {
  outline: 2px solid var(--glow);
  outline-offset: 2px;
}

/* ---------- 站点骨架：侧栏 + 主栏 ---------- */
.site-shell {
  display: grid;
  grid-template-columns: var(--side-w) 1fr;
  min-block-size: 100dvb;
}

/* 侧边导航 */
.side-nav {
  background-color: var(--ink-mid);
  border-inline-end: 1px solid var(--glow-faint);
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  padding-block: 2rem;
  padding-inline: 1.25rem;
  position: sticky;
  inset-block-start: 0;
  block-size: 100dvb;
  overflow-y: auto;
}

.brand-block {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-block-end: 1rem;
  border-block-end: 1px solid var(--glow-faint);
}
.brand-mark {
  inline-size: 40px;
  block-size: 40px;
  object-fit: contain;
}
.brand-name {
  font-family: var(--ff-serif);
  font-size: 1.05rem;
  font-variant: small-caps;
  letter-spacing: 0.05em;
  color: var(--glow);
  text-decoration: none;
  font-style: normal;
}

/* 导航链接 */
.primary-nav {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.nav-link {
  display: block;
  padding-block: 0.55rem;
  padding-inline: 0.75rem;
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--text-mute);
  text-decoration: none;
  border-inline-start: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s, background-color 0.15s;
  border-radius: var(--r-sm);
  min-block-size: 40px;
  align-content: center;
}
.nav-link:hover, .nav-link:focus-visible {
  color: var(--glow);
  border-inline-start-color: var(--glow);
  background-color: var(--glow-faint);
}
.nav-active {
  color: var(--glow);
  border-inline-start-color: var(--glow);
  background-color: var(--glow-faint);
}

/* 侧栏相关文章 */
.side-related {
  margin-block-start: auto;
  padding-block-start: 1rem;
  border-block-start: 1px solid var(--glow-faint);
}
.side-rel-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-mute);
  text-transform: uppercase;
  margin-block-end: 0.5rem;
}
.side-rel-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.side-rel-list li a {
  font-size: 0.78rem;
  color: var(--text-mute);
  text-decoration: none;
}
.side-rel-list li a:hover { color: var(--glow); }

/* 主栏 */
.main-col {
  max-inline-size: var(--main-max);
  width: 100%;
  padding-block: 2.5rem;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: calc(var(--gap) * 1.5);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-mute);
}
.breadcrumb a { color: var(--text-mute); }
.breadcrumb a:hover { color: var(--glow); }
.bc-sep { color: var(--glow-dim); }

/* ---------- section 标签 ---------- */
.section-label {
  font-family: var(--ff-serif);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--glow);
  padding-block-end: 0.4rem;
  border-block-end: 1px solid var(--glow-faint);
  margin-block-end: 1rem;
}

/* ---------- 首页 ---------- */
.home-hero {
  padding-block: 2rem;
  border-block-end: 1px solid var(--glow-faint);
}
.hero-h1 {
  font-family: var(--ff-serif);
  font-size: clamp(1.5rem, 3vw + 0.5rem, 2.2rem);
  line-height: 1.25;
  color: var(--text-head);
  margin-block-end: 0.75rem;
}
.hero-tagline {
  font-size: 0.9rem;
  color: var(--text-mute);
  max-inline-size: 60ch;
}

/* 栏目卡片网格 */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}
.cat-card {
  background-color: var(--ink-mid);
  border: 1px solid var(--ink-light);
  border-block-start: 2px solid var(--glow);
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color 0.2s;
}
.cat-card:hover { border-color: var(--glow); }
.cat-card h3 {
  font-family: var(--ff-serif);
  font-size: 0.9rem;
  margin: 0;
  line-height: 1.3;
}
.cat-card h3 a { color: var(--text-head); text-decoration: none; }
.cat-card h3 a:hover { color: var(--glow); }
.cat-desc { font-size: 0.78rem; color: var(--text-mute); margin: 0; line-height: 1.5; }
.cat-count {
  font-size: 0.7rem;
  color: var(--glow-dim);
  letter-spacing: 0.05em;
  margin-block-start: auto;
}

/* 最新文章列表 */
.art-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.art-item {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding-block: 0.6rem;
  border-block-end: 1px solid var(--ink-light);
}
.art-date {
  font-size: 0.72rem;
  color: var(--glow-dim);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.art-link {
  font-size: 0.88rem;
  color: var(--text-main);
  text-decoration: none;
}
.art-link:hover { color: var(--glow); }
.more-link {
  font-size: 0.82rem;
  color: var(--glow);
  text-decoration: none;
  align-self: flex-start;
}
.more-link:hover { color: #fff; }

/* ---------- 栏目页 ---------- */
.cat-header { border-block-end: 1px solid var(--glow-faint); padding-block-end: 1rem; }
.cat-h1 {
  font-family: var(--ff-serif);
  font-size: clamp(1.3rem, 2.5vw + 0.4rem, 1.9rem);
  color: var(--text-head);
  line-height: 1.3;
  margin-block-end: 0.5rem;
}
.cat-lead { font-size: 0.88rem; color: var(--text-mute); max-inline-size: 60ch; }

.entry-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.entry-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  background-color: var(--ink-mid);
  border: 1px solid var(--ink-light);
  padding: 1rem;
  transition: border-color 0.2s;
}
.entry-card:hover { border-color: var(--glow-faint); }
.thumb-wrap { inline-size: 90px; block-size: 70px; overflow: hidden; flex-shrink: 0; }
.thumb { inline-size: 90px; block-size: 70px; object-fit: cover; }
.entry-body { display: flex; flex-direction: column; gap: 0.35rem; }
.entry-title { font-family: var(--ff-serif); font-size: 0.95rem; margin: 0; line-height: 1.35; }
.entry-title a { color: var(--text-head); text-decoration: none; }
.entry-title a:hover { color: var(--glow); }
.entry-desc { font-size: 0.78rem; color: var(--text-mute); margin: 0; line-height: 1.5; }
.entry-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: 0.72rem;
  color: var(--glow-dim);
}
.read-more { color: var(--glow); text-decoration: none; }
.read-more:hover { color: #fff; }
.empty-note { color: var(--text-mute); font-size: 0.85rem; }

/* ---------- 文章页 ---------- */
.art-hero { inline-size: 100%; max-block-size: 320px; overflow: hidden; }
.hero-img { inline-size: 100%; block-size: 320px; object-fit: cover; object-position: center; }

.art-wrap { display: flex; flex-direction: column; gap: 1.5rem; }
.art-head { border-block-end: 1px solid var(--glow-faint); padding-block-end: 1rem; }
.art-h1 {
  font-family: var(--ff-serif);
  font-size: clamp(1.35rem, 2.8vw + 0.4rem, 2rem);
  color: var(--text-head);
  line-height: 1.25;
  margin-block-end: 0.75rem;
}
.art-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-mute);
}
.pub-date, .mod-date { font-variant-numeric: tabular-nums; }
.cat-tag {
  background-color: var(--glow-faint);
  color: var(--glow);
  font-size: 0.72rem;
  padding-block: 0.15rem;
  padding-inline: 0.55rem;
  text-decoration: none;
  letter-spacing: 0.05em;
}
.cat-tag:hover { background-color: var(--ink-light); color: var(--glow); }

/* 相关文章（正文下方） */
.related-section { border-block-start: 1px solid var(--glow-faint); padding-block-start: 1.25rem; }
.related-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}
.related-list li a { font-size: 0.85rem; color: var(--text-mute); text-decoration: none; }
.related-list li a::before { content: '→ '; color: var(--glow-dim); }
.related-list li a:hover { color: var(--glow); }

/* ---------- 关于页 ---------- */
.about-frame { display: flex; flex-direction: column; gap: 1.5rem; }
.about-head { border-block-end: 2px solid var(--glow); padding-block-end: 0.75rem; }
.about-h1 {
  font-family: var(--ff-serif);
  font-size: clamp(1.4rem, 2.5vw + 0.5rem, 2rem);
  color: var(--text-head);
  line-height: 1.3;
}
.about-rule { block-size: 2px; background-color: var(--glow-faint); margin-block-start: 0.5rem; }
.about-meta-block {
  background-color: var(--ink-mid);
  border-inline-start: 3px solid var(--glow);
  padding: 1rem 1.25rem;
}
.about-dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 1.25rem;
  margin: 0;
  font-size: 0.85rem;
}
.about-dl dt { color: var(--glow-dim); }
.about-dl dd { margin: 0; color: var(--text-main); }
.about-footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.8rem;
  padding-block-start: 1rem;
  border-block-start: 1px solid var(--ink-light);
}
.nav-prefix { color: var(--text-mute); }
.about-footer-nav a { color: var(--text-mute); text-decoration: none; }
.about-footer-nav a:hover { color: var(--glow); }
.sep { color: var(--ink-light); }

/* ---------- 隐私页 ---------- */
.legal-frame { display: flex; flex-direction: column; gap: 1.5rem; }
.legal-head { border-block-end: 1px solid var(--glow-faint); padding-block-end: 0.75rem; }
.legal-h1 {
  font-family: var(--ff-serif);
  font-size: clamp(1.3rem, 2vw + 0.5rem, 1.8rem);
  color: var(--text-head);
  line-height: 1.3;
  margin-block-end: 0.4rem;
}
.legal-date { font-size: 0.75rem; color: var(--text-mute); }
.legal-back {
  display: flex;
  gap: 1.5rem;
  font-size: 0.82rem;
  padding-block-start: 1rem;
  border-block-start: 1px solid var(--ink-light);
}
.legal-back a { color: var(--glow-dim); text-decoration: none; }
.legal-back a:hover { color: var(--glow); }

/* ---------- 正文排版（prose）---------- */
.prose {
  max-inline-size: 68ch;
  font-family: var(--ff-mono);
  font-size: clamp(0.95rem, 1.2vw + 0.5rem, 1.05rem);
  line-height: 1.75;
  color: var(--text-main);
}
.prose h2 {
  font-family: var(--ff-serif);
  font-size: clamp(1.1rem, 1.8vw + 0.3rem, 1.4rem);
  color: var(--text-head);
  margin-block: 2rem 0.75rem;
  padding-block-end: 0.3rem;
  border-block-end: 1px solid var(--glow-faint);
  line-height: 1.3;
}
.prose h3 {
  font-family: var(--ff-serif);
  font-size: 1rem;
  color: var(--glow);
  margin-block: 1.5rem 0.5rem;
  line-height: 1.35;
}
.prose p { margin-block: 0 0.9rem; }
.prose ul, .prose ol {
  padding-inline-start: 1.5rem;
  margin-block: 0 0.9rem;
}
.prose li { margin-block-end: 0.3rem; }
.prose blockquote {
  margin-block: 1rem;
  margin-inline: 0;
  padding-block: 0.5rem;
  padding-inline: 1rem;
  border-inline-start: 3px solid var(--glow-dim);
  background-color: var(--ink-mid);
  color: var(--text-mute);
  font-style: italic;
}
.prose code {
  background-color: var(--ink-light);
  color: var(--glow);
  padding-block: 0.1em;
  padding-inline: 0.35em;
  font-size: 0.88em;
}
.prose pre {
  background-color: var(--ink-mid);
  border: 1px solid var(--ink-light);
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.85em;
}
.prose pre code { background: none; padding: 0; }
.prose strong { color: var(--text-head); }
.prose em { color: var(--glow-dim); font-style: italic; }
.prose a { color: var(--glow); }
.prose a:hover { color: #fff; }
.prose time { color: var(--glow-dim); font-variant-numeric: tabular-nums; }
.prose img {
  inline-size: 100%;
  block-size: auto;
  margin-block: 1rem;
}
.prose table {
  inline-size: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-block: 1rem;
}
.prose th {
  background-color: var(--ink-mid);
  color: var(--glow);
  padding-block: 0.4rem;
  padding-inline: 0.6rem;
  text-align: start;
  border-block-end: 1px solid var(--glow-faint);
}
.prose td {
  padding-block: 0.35rem;
  padding-inline: 0.6rem;
  border-block-end: 1px solid var(--ink-light);
}
.prose hr {
  border: none;
  border-block-start: 1px solid var(--glow-faint);
  margin-block: 1.5rem;
}

/* ---------- 页脚 ---------- */
.site-foot {
  background-color: var(--ink-mid);
  border-block-start: 1px solid var(--glow-faint);
  grid-column: 1 / -1;
}
.foot-inner {
  max-inline-size: calc(var(--side-w) + var(--main-max) + 5rem);
  margin-inline: auto;
  padding-block: 1.25rem;
  padding-inline: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  align-items: center;
}
.foot-brand {
  font-family: var(--ff-serif);
  font-size: 0.85rem;
  color: var(--glow-dim);
  font-variant: small-caps;
}
.foot-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0;
}
.foot-nav a {
  font-size: 0.75rem;
  color: var(--text-mute);
  text-decoration: none;
  padding-block: 0.3rem;
  padding-inline: 0.6rem;
  min-block-size: 40px;
  display: inline-flex;
  align-items: center;
}
.foot-nav a:hover { color: var(--glow); }

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* ---------- 移动端断点 ---------- */
@media (max-width: 767px) {
  :root { --side-w: 100%; }

  .site-shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
  }

  .side-nav {
    position: static;
    block-size: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding-block: 0.75rem;
    padding-inline: 1rem;
    border-block-end: 1px solid var(--glow-faint);
    border-inline-end: none;
    overflow-x: auto;
    overflow-y: visible;
  }

  .brand-block {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    padding-block-end: 0;
    border-block-end: none;
    padding-inline-end: 0.75rem;
    border-inline-end: 1px solid var(--glow-faint);
  }

  .primary-nav {
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 0.1rem;
  }

  .nav-link {
    white-space: nowrap;
    font-size: 0.72rem;
    padding-block: 0.4rem;
    padding-inline: 0.5rem;
    min-block-size: 40px;
    border-inline-start: none;
    border-block-end: 2px solid transparent;
  }

  .nav-link:hover, .nav-active {
    border-inline-start-color: transparent;
    border-block-end-color: var(--glow);
  }

  .side-related { display: none; }

  .main-col {
    padding-block: 1.5rem;
    padding-inline: 1rem;
    max-inline-size: 100%;
  }

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

  .art-item {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .entry-card {
    grid-template-columns: 1fr;
  }

  .thumb-wrap { inline-size: 100%; block-size: 140px; }
  .thumb { inline-size: 100%; block-size: 140px; }

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

  .foot-inner { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}

@media (max-width: 400px) {
  .primary-nav { gap: 0; }
  .nav-link { font-size: 0.68rem; padding-inline: 0.4rem; }
}