/* ============================================================
   岁时记 · almanac — shared stylesheet
   Field Guide aesthetics, extracted from family-archive-guide.html
   + site framework (header / hero / cards / section-index / footer)
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --bg: #EFE8D8;
  --paper: #F7F2E4;
  --paper-warm: #F1EAD7;
  --ink: #1F1B16;
  --ink-soft: #4A4239;
  --ink-muted: #8A8170;
  --line: #C9BFA3;
  --line-soft: #DDD3B8;
  --accent: #9C3A1A;
  --accent-dark: #6B2510;
  --gold: #A8843C;
  --cat-1: #B0392A;
  --cat-2: #2D5A88;
  --cat-3: #4A7048;
  --cat-4: #B8852B;
  --cat-5: #6E6859;
  --serif: 'Noto Serif SC', 'Songti SC', serif;
  --sans: 'Noto Sans SC', -apple-system, sans-serif;
  --display: 'Fraunces', 'Noto Serif SC', serif;
  --mono: 'JetBrains Mono', 'SF Mono', monospace;

  /* section theme colors (resolved at body level) */
  --c-archive: var(--accent);     /* 家庭档案 — 赭石红 */
  --c-travel:   var(--cat-3);     /* 旅游攻略 — 墨绿 */
  --c-living:   var(--cat-4);     /* 生活手册 — 金黄 */
  --c-notes:    var(--cat-2);     /* 学习笔记 — 深蓝 */
}

/* ---------- Reset & base ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none; z-index: 1; opacity: 0.4;
  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='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.4 0 0 0 0 0.35 0 0 0 0 0.25 0 0 0 0.08 0'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: inherit; }

/* ---------- Page container (article width) ---------- */
.page { max-width: 880px; margin: 0 auto; padding: 0 56px; position: relative; z-index: 2; }

/* ============================================================
   ARTICLE COMPONENTS (preserved verbatim from field guide)
   ============================================================ */

/* ---------- Cover ---------- */
.cover { padding: 120px 0 80px; border-bottom: 1px solid var(--line); }
.cover-meta { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; letter-spacing: 0.15em; color: var(--ink-muted); text-transform: uppercase; margin-bottom: 80px; }
.cover-meta span::before { content: '— '; }
.cover-label { font-family: var(--display); font-style: italic; font-size: 16px; color: var(--accent); letter-spacing: 0.05em; margin-bottom: 24px; }
.cover-label::before { content: ''; display: inline-block; width: 32px; height: 1px; background: var(--accent); vertical-align: middle; margin-right: 16px; }
.cover h1 { font-family: var(--serif); font-weight: 900; font-size: 88px; line-height: 1.05; letter-spacing: -0.02em; margin-bottom: 32px; }
.cover h1 em { font-family: var(--display); font-style: italic; font-weight: 400; color: var(--accent); font-size: 0.55em; display: block; margin-top: 12px; }
.cover-sub { font-size: 17px; color: var(--ink-soft); max-width: 520px; line-height: 1.8; margin-top: 40px; border-left: 2px solid var(--accent); padding-left: 20px; }
.cover-footer { display: flex; justify-content: space-between; align-items: flex-end; margin-top: 100px; padding-top: 24px; border-top: 1px solid var(--line); }
.cover-footer-item { font-family: var(--mono); font-size: 11px; color: var(--ink-muted); letter-spacing: 0.1em; }
.cover-footer-item strong { display: block; font-family: var(--serif); font-size: 22px; color: var(--ink); font-weight: 600; margin-top: 4px; letter-spacing: 0; }

/* ---------- Table of contents ---------- */
.toc { padding: 80px 0; border-bottom: 1px solid var(--line); }
.section-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.25em; color: var(--accent); text-transform: uppercase; margin-bottom: 16px; }
.section-label::before { content: '§ '; }
.section-title { font-family: var(--serif); font-weight: 700; font-size: 38px; letter-spacing: -0.01em; margin-bottom: 8px; }
.section-title em { font-family: var(--display); font-style: italic; font-weight: 400; color: var(--ink-muted); font-size: 0.6em; margin-left: 12px; }
.toc-list { margin-top: 48px; list-style: none; }
.toc-list li { display: flex; align-items: baseline; padding: 14px 0; border-bottom: 1px dashed var(--line-soft); }
.toc-num { font-family: var(--display); font-style: italic; font-size: 18px; color: var(--accent); width: 50px; flex-shrink: 0; }
.toc-title { font-family: var(--serif); font-size: 17px; font-weight: 500; flex-grow: 1; }
.toc-en { font-family: var(--display); font-style: italic; font-size: 13px; color: var(--ink-muted); margin-left: 12px; }
.toc-page { font-family: var(--mono); font-size: 12px; color: var(--ink-muted); width: 40px; text-align: right; }

/* ---------- Sections & chapters ---------- */
section { padding: 90px 0; border-bottom: 1px solid var(--line); position: relative; }
.chapter-header { display: flex; align-items: flex-start; gap: 32px; margin-bottom: 56px; }
.chapter-num { font-family: var(--display); font-style: italic; font-weight: 300; font-size: 96px; line-height: 0.9; color: var(--accent); letter-spacing: -0.04em; flex-shrink: 0; }
.chapter-title-block { padding-top: 20px; border-top: 2px solid var(--ink); flex-grow: 1; }
.chapter-kicker { font-family: var(--display); font-style: italic; font-size: 15px; color: var(--ink-muted); margin-bottom: 8px; }
.chapter-title { font-family: var(--serif); font-weight: 700; font-size: 34px; letter-spacing: -0.01em; line-height: 1.2; }
.lead { font-family: var(--serif); font-size: 17px; line-height: 1.9; color: var(--ink-soft); max-width: 640px; margin-bottom: 48px; }
.lead::first-letter { font-family: var(--display); font-size: 56px; float: left; line-height: 0.9; margin: 6px 8px 0 0; color: var(--accent); font-weight: 600; }

/* ---------- Tree (directory structure) ---------- */
.tree { font-family: var(--mono); font-size: 13.5px; line-height: 1.9; background: var(--paper); border: 1px solid var(--line); padding: 22px 32px 28px; color: var(--ink-soft); overflow-x: auto; border-radius: 2px; white-space: pre; word-break: normal; tab-size: 2; }
.tree::before { content: 'STRUCTURE'; display: block; font-size: 10px; letter-spacing: 0.25em; color: var(--ink-muted); margin-bottom: 14px; }
.tree .root { color: var(--accent); font-weight: 500; }
.tree .key { color: var(--ink); }
.tree .note { color: var(--ink-muted); font-style: italic; }
.tree .accent { color: var(--accent); }

/* ---------- Categories ---------- */
.categories { display: grid; gap: 20px; }
.category { display: grid; grid-template-columns: 80px 1fr auto; gap: 32px; align-items: center; padding: 28px 32px; background: var(--paper); border-left: 4px solid; transition: transform 0.3s ease; }
.category:hover { transform: translateX(4px); }
.category[data-cat="1"] { border-color: var(--cat-1); }
.category[data-cat="2"] { border-color: var(--cat-2); }
.category[data-cat="3"] { border-color: var(--cat-3); }
.category[data-cat="4"] { border-color: var(--cat-4); }
.category[data-cat="5"] { border-color: var(--cat-5); }
.cat-num { font-family: var(--display); font-style: italic; font-size: 48px; font-weight: 300; line-height: 1; }
.category[data-cat="1"] .cat-num { color: var(--cat-1); }
.category[data-cat="2"] .cat-num { color: var(--cat-2); }
.category[data-cat="3"] .cat-num { color: var(--cat-3); }
.category[data-cat="4"] .cat-num { color: var(--cat-4); }
.category[data-cat="5"] .cat-num { color: var(--cat-5); }
.cat-body h3 { font-family: var(--serif); font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.cat-body .en { font-family: var(--display); font-style: italic; font-size: 13px; color: var(--ink-muted); margin-bottom: 8px; }
.cat-body .items { font-size: 14px; color: var(--ink-soft); }
.cat-color { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.cat-swatch { width: 32px; height: 32px; border-radius: 50%; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.cat-color-label { font-family: var(--mono); font-size: 10px; color: var(--ink-muted); letter-spacing: 0.1em; }

/* ---------- Subheads ---------- */
.subhead { font-family: var(--serif); font-size: 20px; font-weight: 600; margin: 48px 0 20px; display: flex; align-items: baseline; gap: 14px; }
.subhead::before { content: attr(data-num); font-family: var(--display); font-style: italic; font-size: 16px; color: var(--accent); font-weight: 400; }
.subhead-rule { flex-grow: 1; height: 1px; background: var(--line); margin-left: 8px; }

/* ---------- Tables ---------- */
.tbl { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.tbl thead th { font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-muted); text-align: left; padding: 12px 16px; border-bottom: 2px solid var(--ink); font-weight: 500; }
.tbl tbody td { padding: 16px; border-bottom: 1px solid var(--line-soft); vertical-align: top; color: var(--ink-soft); }
.tbl tbody td:first-child { font-family: var(--serif); font-weight: 600; color: var(--ink); }
.tbl tbody tr:hover { background: var(--paper-warm); }
.tbl .num { font-family: var(--mono); color: var(--accent); }
.tbl .price { font-family: var(--mono); text-align: right; color: var(--ink); font-weight: 500; }
.tbl tfoot td { padding: 16px; border-top: 2px solid var(--ink); font-family: var(--serif); font-weight: 700; }
.tbl tfoot .price { font-size: 18px; color: var(--accent); }

/* ---------- Multi-column layouts ---------- */
.three-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin: 24px 0; border: 1px solid var(--line); background: var(--paper); }
.col-card { padding: 28px 24px; border-right: 1px solid var(--line-soft); }
.col-card:last-child { border-right: none; }
.col-card .num { font-family: var(--display); font-style: italic; font-size: 32px; color: var(--accent); margin-bottom: 8px; line-height: 1; }
.col-card h4 { font-family: var(--serif); font-size: 17px; font-weight: 700; margin-bottom: 12px; }
.col-card p { font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin: 24px 0; }

/* ---------- Callout ---------- */
.callout { background: var(--ink); color: var(--paper); padding: 32px 40px; margin: 32px 0; position: relative; border-radius: 2px; }
.callout::before { content: '"'; position: absolute; top: 0; left: 16px; font-family: var(--display); font-size: 80px; color: var(--accent); line-height: 1; font-style: italic; }
.callout p { font-family: var(--serif); font-size: 19px; line-height: 1.7; padding-left: 32px; }
.callout .accent { color: var(--gold); font-weight: 600; }

/* ---------- Timeline (weekly plan) ---------- */
.timeline { margin: 24px 0; }
.week { margin-bottom: 40px; padding-bottom: 32px; border-bottom: 1px dashed var(--line); }
.week:last-child { border-bottom: none; }
.week-header { display: flex; align-items: baseline; gap: 16px; margin-bottom: 20px; }
.week-label { font-family: var(--display); font-style: italic; font-size: 24px; color: var(--accent); }
.week-title { font-family: var(--serif); font-size: 22px; font-weight: 700; }
.week-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; }
.day { background: var(--paper); border: 1px solid var(--line-soft); padding: 14px 10px; min-height: 110px; display: flex; flex-direction: column; }
.day-num { font-family: var(--mono); font-size: 10px; color: var(--accent); letter-spacing: 0.1em; margin-bottom: 6px; }
.day-task { font-family: var(--serif); font-size: 12.5px; line-height: 1.5; color: var(--ink); font-weight: 500; }
.day-time { margin-top: auto; font-family: var(--mono); font-size: 10px; color: var(--ink-muted); padding-top: 6px; }

/* ---------- Cheatsheet ---------- */
.cheatsheet { background: var(--ink); color: var(--paper); padding: 56px 48px; margin: 32px 0; position: relative; border-radius: 2px; }
.cheatsheet::before { content: ''; position: absolute; top: 12px; left: 12px; right: 12px; bottom: 12px; border: 1px solid rgba(168,132,60,0.3); pointer-events: none; }
.cheatsheet-header { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 32px; padding-bottom: 20px; border-bottom: 1px solid rgba(168,132,60,0.4); }
.cheatsheet-title { font-family: var(--serif); font-size: 28px; font-weight: 700; color: var(--paper); }
.cheatsheet-title em { font-family: var(--display); font-style: italic; font-weight: 400; color: var(--gold); font-size: 0.7em; margin-left: 12px; }
.cheatsheet-label { font-family: var(--mono); font-size: 10px; color: var(--gold); letter-spacing: 0.2em; }
.cheat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px; }
.cheat-row { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 11px 0; border-bottom: 1px dotted rgba(168,132,60,0.25); font-size: 14px; }
.cheat-row .find { color: var(--paper); font-family: var(--serif); }
.cheat-row .arrow { color: var(--gold); font-family: var(--mono); padding: 0 12px; font-size: 12px; }
.cheat-row .loc { color: var(--gold); font-family: var(--mono); font-size: 12px; text-align: right; letter-spacing: 0.05em; }

/* ---------- Principles ---------- */
.principles { text-align: center; padding: 40px 0; }
.principle { font-family: var(--serif); font-size: 36px; font-weight: 700; letter-spacing: -0.01em; line-height: 1.5; margin: 16px 0; }
.principle em { font-family: var(--display); font-style: italic; color: var(--accent); font-weight: 400; }
.principle-divider { width: 40px; height: 1px; background: var(--line); margin: 32px auto; }

/* ---------- Tips & tags ---------- */
.tip { background: var(--paper); border: 1px solid var(--line); padding: 20px 24px; margin: 20px 0; font-size: 14px; color: var(--ink-soft); display: flex; gap: 16px; align-items: flex-start; border-radius: 2px; }
.tip-mark { font-family: var(--display); font-style: italic; font-size: 24px; color: var(--accent); line-height: 1; flex-shrink: 0; }

.tag { display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.15em; padding: 3px 8px; border: 1px solid var(--line); border-radius: 2px; color: var(--ink-muted); text-transform: uppercase; margin-right: 6px; }
.tag.red { color: var(--cat-1); border-color: var(--cat-1); }
.tag.blue { color: var(--cat-2); border-color: var(--cat-2); }
.tag.green { color: var(--cat-3); border-color: var(--cat-3); }
.tag.yellow { color: var(--cat-4); border-color: var(--cat-4); }
.tag.gray { color: var(--cat-5); border-color: var(--cat-5); }

/* ---------- Article (in-page) footer ---------- */
.page-footer { padding: 60px 0 80px; text-align: center; font-family: var(--mono); font-size: 11px; color: var(--ink-muted); letter-spacing: 0.15em; }
.page-footer .mark { font-family: var(--display); font-style: italic; font-size: 28px; color: var(--accent); margin-bottom: 16px; }
.page-footer .colophon { margin-top: 16px; font-family: var(--display); font-style: italic; font-size: 13px; color: var(--ink-muted); letter-spacing: 0.02em; }

/* ============================================================
   SITE FRAMEWORK (new)
   ============================================================ */

/* ---------- Site header / nav ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper-warm);
  position: relative;
  z-index: 3;
}
.site-nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 56px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 32px;
}
.site-nav .brand {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav .brand em {
  font-family: var(--display);
  font-style: italic;
  font-weight: 400;
  font-size: 13px;
  color: var(--accent);
  margin-left: 8px;
  letter-spacing: 0.06em;
}
.site-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}
.site-nav ul a {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.site-nav ul a:hover { color: var(--ink); }
.site-nav ul a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Home hero ---------- */
.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 140px 56px 80px;
  position: relative;
  z-index: 2;
}
.hero-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-bottom: 80px;
}
.hero-meta span::before { content: '— '; }
.hero-label {
  font-family: var(--display);
  font-style: italic;
  font-size: 16px;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}
.hero-label::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--accent);
  vertical-align: middle;
  margin-right: 16px;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 128px;
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 0;
}
.hero h1 em {
  display: block;
  font-family: var(--display);
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
  font-size: 0.32em;
  margin-top: 24px;
  letter-spacing: 0.06em;
}
.hero-slogan {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--ink-soft);
  margin-top: 48px;
  border-left: 2px solid var(--accent);
  padding-left: 20px;
  line-height: 1.8;
  max-width: 620px;
}
.hero-intro {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink-soft);
  max-width: 600px;
  margin-top: 40px;
}

/* ---------- Home section cards ---------- */
.section-cards {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 56px 120px;
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.cards-label {
  grid-column: 1 / -1;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.cards-label::before { content: '§ '; }
.section-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 44px 40px 40px;
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  border-radius: 2px;
  overflow: hidden;
}
.section-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 6px;
  background: var(--card-color);
}
.section-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0,0,0,0.07);
  border-color: var(--card-color);
}
.section-card[data-section="archive"] { --card-color: var(--c-archive); }
.section-card[data-section="travel"]  { --card-color: var(--c-travel); }
.section-card[data-section="living"]  { --card-color: var(--c-living); }
.section-card[data-section="notes"]   { --card-color: var(--c-notes); }
.card-num {
  font-family: var(--display);
  font-style: italic;
  font-weight: 300;
  font-size: 28px;
  color: var(--card-color);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  line-height: 1;
}
.card-name {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}
.card-en {
  font-family: var(--display);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-muted);
  margin-bottom: 18px;
}
.card-desc {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.85;
}
.card-arrow {
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--card-color);
  text-transform: uppercase;
}

/* ---------- Section index page ---------- */
.section-index {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 56px;
  position: relative;
  z-index: 2;
}
.section-hero {
  padding: 100px 0 60px;
  border-bottom: 1px solid var(--line);
}
.section-hero .sh-num {
  font-family: var(--display);
  font-style: italic;
  font-weight: 300;
  font-size: 96px;
  line-height: 0.9;
  color: var(--section-color, var(--accent));
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}
.section-hero .sh-kicker {
  font-family: var(--display);
  font-style: italic;
  font-size: 15px;
  color: var(--ink-muted);
  margin-bottom: 8px;
}
.section-hero h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 48px;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  line-height: 1.2;
}
.section-hero h1 em {
  font-family: var(--display);
  font-style: italic;
  font-weight: 400;
  color: var(--ink-muted);
  font-size: 0.5em;
  margin-left: 12px;
}
.section-hero .sh-tagline {
  font-family: var(--serif);
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 540px;
  line-height: 1.85;
  border-left: 2px solid var(--section-color, var(--accent));
  padding-left: 20px;
  margin-top: 32px;
}

/* ---------- Article list ---------- */
.article-list { padding: 64px 0 40px; }
.article-list-header {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--section-color, var(--accent));
  text-transform: uppercase;
  margin-bottom: 32px;
}
.article-list-header::before { content: '§ '; }
.article-item {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 28px 0;
  border-bottom: 1px dashed var(--line-soft);
  transition: transform 0.2s ease;
}
.article-item:hover { transform: translateX(4px); }
.article-item-row {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
}
.article-item-num {
  font-family: var(--display);
  font-style: italic;
  font-size: 16px;
  color: var(--section-color, var(--accent));
  width: 32px;
  flex-shrink: 0;
}
.article-item-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
}
.article-item-en {
  font-family: var(--display);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-muted);
}
.article-item-meta {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.article-item-desc {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 8px;
  padding-left: 50px;
  line-height: 1.75;
}

/* ---------- Empty state (section without articles yet) ---------- */
.empty-state {
  padding: 72px 0 40px;
  text-align: center;
}
.empty-state .empty-mark {
  font-family: var(--display);
  font-style: italic;
  font-size: 28px;
  color: var(--section-color, var(--accent));
  margin-bottom: 20px;
}
.empty-state .empty-text {
  font-family: var(--serif);
  font-size: 17px;
  color: var(--ink-soft);
  line-height: 1.95;
  max-width: 500px;
  margin: 0 auto;
}
.empty-state .empty-note {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-top: 28px;
}
.empty-state .empty-note::before { content: '— '; }

/* ---------- Site footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 56px 56px 72px;
  text-align: center;
  position: relative;
  z-index: 2;
  margin-top: 40px;
}
.site-footer-mark {
  font-family: var(--display);
  font-style: italic;
  font-size: 28px;
  color: var(--accent);
  margin-bottom: 16px;
}
.site-footer-main {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-muted);
  letter-spacing: 0.15em;
}
.site-footer-sub {
  margin-top: 14px;
  font-family: var(--display);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-muted);
  letter-spacing: 0.02em;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  .page { padding: 0 24px; }
  .cover { padding: 60px 0 40px; }
  .cover h1 { font-size: 48px; }
  .cover-meta { flex-direction: column; gap: 8px; margin-bottom: 40px; }
  .chapter-header { flex-direction: column; gap: 12px; }
  .chapter-num { font-size: 64px; }
  .chapter-title { font-size: 26px; }
  .category { grid-template-columns: 60px 1fr; }
  .category .cat-color { display: none; }
  .week-grid { grid-template-columns: 1fr; }
  .cheat-grid { grid-template-columns: 1fr; }
  .three-col { grid-template-columns: 1fr; }
  .col-card { border-right: none; border-bottom: 1px solid var(--line-soft); }
  .two-col { grid-template-columns: 1fr; }
  .principle { font-size: 24px; }

  /* site framework */
  .site-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 24px;
  }
  .site-nav ul { gap: 16px; }
  .hero { padding: 64px 24px 40px; }
  .hero-meta { flex-direction: column; gap: 8px; margin-bottom: 40px; }
  .hero h1 { font-size: 60px; }
  .hero h1 em { font-size: 0.34em; margin-top: 16px; }
  .hero-slogan { font-size: 18px; }
  .section-cards { grid-template-columns: 1fr; padding: 32px 24px 80px; gap: 20px; }
  .section-card { padding: 36px 28px 32px; }
  .card-name { font-size: 26px; }
  .section-index { padding: 0 24px; }
  .section-hero { padding: 56px 0 40px; }
  .section-hero h1 { font-size: 32px; }
  .section-hero .sh-num { font-size: 64px; }
  .article-item-title { font-size: 18px; }
  .article-item-meta { display: none; }
  .article-item-desc { padding-left: 0; }
  .site-footer { padding: 40px 24px 56px; }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
  body { background: white; font-size: 11pt; }
  body::before { display: none; }
  .site-header { display: none; }
  .site-footer { display: none; }
  .page { max-width: 100%; padding: 0 24px; }
  .section-index { max-width: 100%; padding: 0 24px; }
  section { page-break-inside: avoid; padding: 24px 0; }
  .cheatsheet { page-break-inside: avoid; }
  .cover { page-break-after: always; }
  .section-hero { page-break-after: avoid; }
}