/* deep-roots learning site — dual-theme scholarly identity (p-rick family)
   light: warm paper + ink + gold | dark: navy + cream + gold
   theme controlled by [data-theme] on <html>, set by inline bootstrap + assets/theme.js */

:root {
  --serif: 'Playfair Display', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, monospace;
}

html[data-theme="light"] {
  --bg: #faf8f4;
  --bg-raise: #ffffff;
  --bg-soft: #f3efe8;
  --bg-nav: rgba(250, 248, 244, 0.94);
  --ink: #1c2739;
  --text: #2a3748;
  --muted: #5d6b7e;
  --faint: #8b96a5;
  --accent: #8a6d3b;
  --accent-bright: #7a5c1e;
  --accent-soft: rgba(138, 109, 59, 0.10);
  --accent-line: rgba(138, 109, 59, 0.32);
  --card: #ffffff;
  --card-border: rgba(28, 39, 57, 0.12);
  --shadow: 0 1px 2px rgba(28, 39, 57, 0.05), 0 8px 24px rgba(28, 39, 57, 0.07);
  --code-bg: rgba(138, 109, 59, 0.10);
  --code-block-bg: #f6f2ea;
  --selection: rgba(138, 109, 59, 0.22);
  --hero-ink: #131c2b;
  --hr: rgba(28, 39, 57, 0.14);
}

html[data-theme="dark"] {
  --bg: #162032;
  --bg-raise: #1c2a40;
  --bg-soft: #131b2a;
  --bg-nav: rgba(22, 32, 50, 0.92);
  --ink: #ffffff;
  --text: #e6ecf2;
  --muted: #8898A8;
  --faint: #607080;
  --accent: #8B7E5A;
  --accent-bright: #b3a378;
  --accent-soft: rgba(139, 126, 90, 0.14);
  --accent-line: rgba(139, 126, 90, 0.30);
  --card: #1c2a40;
  --card-border: rgba(139, 126, 90, 0.22);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 10px 28px rgba(0, 0, 0, 0.35);
  --code-bg: rgba(139, 126, 90, 0.14);
  --code-block-bg: #101827;
  --selection: rgba(139, 126, 90, 0.30);
  --hero-ink: #ffffff;
  --hr: rgba(139, 126, 90, 0.3);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  transition: background 0.25s ease, color 0.25s ease;
}
::selection { background: var(--selection); }
a { color: var(--accent-bright); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  border-radius: 4px;
  padding: 1px 5px;
}
hr { border: 0; border-top: 1px solid var(--hr); margin: 2.4em 0; }

/* ---------- header ---------- */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 6vw; border-bottom: 1px solid var(--accent-line);
  position: sticky; top: 0; background: var(--bg-nav);
  backdrop-filter: blur(8px); z-index: 10;
}
.brand { display: flex; align-items: baseline; gap: 9px; }
.brand-mark {
  font-family: var(--serif); font-weight: 900; font-size: 22px;
  color: var(--ink); letter-spacing: 0.5px;
}
.brand-mark::first-letter { color: var(--accent-bright); }
.brand-sub { font-size: 10px; letter-spacing: 4px; text-transform: uppercase; color: var(--faint); }
.header-right { display: flex; align-items: center; gap: 22px; }
.site-header nav { display: flex; gap: 24px; }
.site-header nav a { color: var(--muted); font-size: 13.5px; letter-spacing: 0.4px; }
.site-header nav a:hover { color: var(--ink); text-decoration: none; }

/* theme toggle */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--card-border);
  background: var(--bg-raise); color: var(--muted);
  cursor: pointer; transition: all 0.2s ease; flex: none;
}
.theme-toggle:hover { color: var(--accent-bright); border-color: var(--accent-line); }
.theme-toggle svg { width: 16px; height: 16px; display: block; }
html[data-theme="light"] .icon-moon { display: none; }
html[data-theme="dark"] .icon-sun { display: none; }

/* ---------- hero ---------- */
.hero { padding: 84px 6vw 60px; max-width: 1060px; margin: 0 auto; }
.hero .kicker {
  color: var(--accent-bright); font-size: 11px; letter-spacing: 4px;
  text-transform: uppercase; margin-bottom: 22px;
}
.hero h1 {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(34px, 5.4vw, 54px); line-height: 1.12;
  color: var(--hero-ink); margin: 0 0 26px; letter-spacing: -0.5px;
}
.hero h1 em { font-style: italic; color: var(--accent-bright); }
.hero .lede {
  font-size: 17.5px; color: var(--muted); max-width: 720px;
  margin: 0 0 30px; line-height: 1.75;
}
.hero .lede strong { color: var(--text); font-weight: 600; }
.hero-facts {
  display: flex; flex-wrap: wrap; gap: 34px; margin-top: 44px;
  border-top: 1px solid var(--hr); padding-top: 26px;
}
.fact { min-width: 130px; }
.fact .n {
  font-family: var(--serif); font-size: 30px; font-weight: 700;
  color: var(--accent-bright); line-height: 1;
}
.fact .l {
  font-size: 11px; letter-spacing: 1.6px; text-transform: uppercase;
  color: var(--faint); margin-top: 7px;
}

/* ---------- sections ---------- */
.section { padding: 66px 6vw; max-width: 1060px; margin: 0 auto; }
.section-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 14px; }
.section-head h2 {
  font-family: var(--serif); font-weight: 700; font-size: 30px;
  color: var(--ink); margin: 0; letter-spacing: -0.3px;
}
.section-head .rule { flex: 1; height: 1px; background: var(--hr); }
.section-intro { color: var(--muted); max-width: 720px; margin: 0 0 34px; }

.arc-label {
  display: flex; align-items: center; gap: 12px; margin: 34px 0 16px;
  font-size: 11px; letter-spacing: 2.4px; text-transform: uppercase; color: var(--faint);
}
.arc-label::after { content: ""; flex: 1; height: 1px; background: var(--hr); }

/* ---------- chapter rows (module index) ---------- */
.chapter-list { display: grid; gap: 0; border-top: 1px solid var(--hr); }
.chapter-row {
  display: flex; align-items: baseline; gap: 22px;
  padding: 16px 8px; border-bottom: 1px solid var(--hr);
  transition: background 0.15s ease;
}
.chapter-row:hover { background: var(--bg-soft); }
.chapter-row .cr-num {
  flex: none; width: 40px; font-family: var(--mono); font-size: 12.5px;
  color: var(--accent-bright); white-space: nowrap; padding-top: 2px;
}
.chapter-row .cr-body { flex: 1; }
.chapter-row h3 { font-family: var(--serif); font-size: 18.5px; font-weight: 700; margin: 0 0 4px; color: var(--ink); line-height: 1.3; }
.chapter-row h3 a { color: var(--ink); }
.chapter-row h3 a:hover { color: var(--accent-bright); text-decoration: none; }
.chapter-row p { margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.55; }
.chapter-row .cr-arrow { color: var(--accent-bright); flex: none; }

/* ---------- module cards (roadmap) ---------- */
.module-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.module-card {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 10px; padding: 22px 24px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 8px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}
.module-card:hover { transform: translateY(-2px); border-color: var(--accent-line); }
.module-card .mc-id {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 1px;
  color: var(--accent-bright); background: var(--accent-soft);
  border-radius: 4px; padding: 3px 8px; white-space: nowrap; align-self: flex-start;
}
.module-card h3 { font-family: var(--serif); font-size: 19px; font-weight: 700; color: var(--ink); margin: 0; line-height: 1.3; }
.module-card p { color: var(--muted); font-size: 13.5px; margin: 0; line-height: 1.62; }
.module-card .mc-status {
  font-size: 10.5px; letter-spacing: 1px; text-transform: uppercase;
  align-self: flex-start; border-radius: 20px; padding: 2px 10px;
  border: 1px solid var(--card-border); color: var(--faint);
}
.module-card.live .mc-status { color: var(--accent-bright); border-color: var(--accent-line); }

/* ---------- about ---------- */
.about-body { color: var(--muted); max-width: 760px; }
.about-body p { margin: 0 0 18px; line-height: 1.78; }
.about-body strong { color: var(--text); }
.about-body a { color: var(--accent-bright); }

/* ---------- footer ---------- */
.site-footer {
  margin-top: 40px; border-top: 1px solid var(--accent-line);
  padding: 44px 6vw 56px; background: var(--bg-soft);
}
.footer-inner { max-width: 1060px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 30px; justify-content: space-between; }
.site-footer .f-brand { font-family: var(--serif); font-weight: 900; font-size: 18px; color: var(--ink); }
.site-footer .f-brand::first-letter { color: var(--accent-bright); }
.site-footer .f-note { color: var(--faint); font-size: 13px; margin-top: 8px; max-width: 460px; line-height: 1.7; }
.footer-links { display: flex; gap: 20px; align-items: flex-start; flex-wrap: wrap; }
.footer-links a { color: var(--muted); font-size: 13px; }
.footer-links a:hover { color: var(--accent-bright); }

/* ---------- chapter pages ---------- */
.blog-main { max-width: 780px; margin: 0 auto; padding: 72px 6vw 80px; }
.post-kicker {
  color: var(--accent-bright); font-size: 11px; letter-spacing: 2.6px;
  text-transform: uppercase; margin-bottom: 16px;
}
.post-title {
  font-family: var(--serif); font-weight: 900; font-size: clamp(26px, 3.8vw, 36px);
  line-height: 1.18; color: var(--ink); margin: 0 0 16px; letter-spacing: -0.4px;
}
.post-meta { color: var(--faint); font-size: 13px; margin-bottom: 40px; }
.post { font-size: 16px; line-height: 1.78; color: var(--text); }
.post p { margin: 0 0 20px; }
.post h2 {
  font-family: var(--serif); font-size: 23px; font-weight: 700;
  color: var(--ink); margin: 42px 0 14px; letter-spacing: -0.2px;
}
.post h3 { font-size: 16.5px; font-weight: 600; color: var(--ink); margin: 32px 0 10px; }
.post blockquote {
  border-left: 3px solid var(--accent-bright); margin: 26px 0;
  padding: 8px 22px; color: var(--muted); background: var(--bg-soft);
  border-radius: 0 6px 6px 0; font-style: italic;
}
.post blockquote strong { color: var(--text); }
.post ul, .post ol { margin: 0 0 20px; padding-left: 26px; }
.post li { margin-bottom: 9px; }
.post li > ul, .post li > ol { margin-top: 9px; margin-bottom: 4px; }
.post strong { color: var(--ink); font-weight: 600; }
.post pre {
  margin: 22px 0; padding: 15px 18px; overflow-x: auto;
  background: var(--code-block-bg); border: 1px solid var(--card-border);
  border-radius: 8px;
}
.post pre code {
  font-family: var(--mono); font-size: 13px; line-height: 1.58;
  background: none; padding: 0; white-space: pre;
}
.post details {
  margin: 24px 0; background: var(--bg-soft); border: 1px solid var(--card-border);
  border-radius: 8px; padding: 14px 18px;
}
.post details summary {
  cursor: pointer; color: var(--accent-bright); font-weight: 600;
  font-size: 14.5px; user-select: none;
}
.post details summary:hover { text-decoration: underline; }
.post details[open] summary { margin-bottom: 12px; }
.post details > p:first-child, .post details > ol:first-child, .post details > ul:first-child { margin-top: 8px; }
.post table {
  width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 13.5px;
  display: block; overflow-x: auto;
}
.post table th {
  text-align: left; padding: 9px 12px; color: var(--muted);
  font-weight: 600; text-transform: uppercase; letter-spacing: 1px;
  font-size: 10.5px; border-bottom: 2px solid var(--accent-line);
  white-space: nowrap;
}
.post table td {
  padding: 9px 12px; border-bottom: 1px solid var(--hr);
  color: var(--text); vertical-align: top; line-height: 1.5;
}
.post table td:first-child { font-weight: 600; color: var(--ink); }
.post table td code { font-size: 12px; }

/* chapter prev/next nav */
.chapter-nav {
  display: flex; justify-content: space-between; gap: 14px; margin: 46px 0 0;
}
.chapter-nav a {
  flex: 1; background: var(--card); border: 1px solid var(--card-border);
  border-radius: 8px; padding: 14px 18px; box-shadow: var(--shadow);
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.chapter-nav a:hover { border-color: var(--accent-line); transform: translateY(-1px); text-decoration: none; }
.chapter-nav a.next { text-align: right; }
.chapter-nav .cn-label {
  font-size: 10.5px; letter-spacing: 1.6px; text-transform: uppercase;
  color: var(--faint); display: block; margin-bottom: 5px;
}
.chapter-nav .cn-title { font-family: var(--serif); font-size: 15.5px; font-weight: 700; color: var(--ink); }
.chapter-nav .cn-only { flex: 1; }

.post-footer {
  margin-top: 48px; padding: 24px 26px; background: var(--bg-soft);
  border: 1px solid var(--card-border); border-radius: 8px;
  color: var(--muted); font-size: 14px; line-height: 1.7;
}
.post-footer a { color: var(--accent-bright); font-weight: 500; }

/* ---------- generic page (roadmap / quiz intro) ---------- */
.page-main { max-width: 1060px; margin: 0 auto; padding: 72px 6vw 80px; }
.page-title {
  font-family: var(--serif); font-weight: 900; font-size: clamp(30px, 4.6vw, 42px);
  color: var(--ink); margin: 0 0 14px; letter-spacing: -0.4px;
}
.page-sub { color: var(--muted); font-size: 16px; max-width: 720px; margin-bottom: 48px; line-height: 1.75; }

/* ---------- interactive quiz ---------- */
.quiz-wrap { max-width: 780px; margin: 0 auto; padding: 72px 6vw 90px; }
.quiz-progress {
  height: 4px; background: var(--bg-soft); border-radius: 3px; overflow: hidden;
  margin: 26px 0 34px;
}
.quiz-progress .bar { height: 100%; width: 0%; background: var(--accent-bright); transition: width 0.3s ease; }
.quiz-count { font-family: var(--mono); font-size: 12px; color: var(--faint); letter-spacing: 1px; }
.quiz-q {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 10px;
  padding: 26px 28px; box-shadow: var(--shadow); margin-bottom: 18px;
}
.quiz-q .q-tag { font-family: var(--mono); font-size: 11px; letter-spacing: 1.5px; color: var(--accent-bright); text-transform: uppercase; margin-bottom: 10px; }
.quiz-q .q-text { font-size: 16.5px; color: var(--ink); font-weight: 600; line-height: 1.6; margin-bottom: 18px; }
.quiz-opt {
  display: block; width: 100%; text-align: left; cursor: pointer;
  background: var(--bg-raise); border: 1px solid var(--card-border); border-radius: 8px;
  color: var(--text); font-family: var(--sans); font-size: 14.5px; line-height: 1.55;
  padding: 12px 16px; margin-bottom: 10px; transition: border-color 0.15s ease, background 0.15s ease;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--accent-line); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt.correct { border-color: var(--accent-bright); background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.quiz-opt.wrong { border-color: rgba(180, 70, 70, 0.55); background: rgba(180, 70, 70, 0.08); color: var(--muted); }
.q-explain {
  margin-top: 14px; padding: 14px 16px; background: var(--bg-soft);
  border: 1px solid var(--card-border); border-radius: 8px;
  color: var(--muted); font-size: 14px; line-height: 1.65;
}
.q-explain strong { color: var(--ink); }
.quiz-score {
  text-align: center; padding: 60px 30px;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 10px; box-shadow: var(--shadow);
}
.quiz-score .s-n { font-family: var(--serif); font-size: 54px; font-weight: 900; color: var(--accent-bright); line-height: 1; }
.quiz-score .s-l { color: var(--muted); font-size: 15px; margin-top: 14px; line-height: 1.7; }
.quiz-score .s-btn {
  display: inline-block; margin-top: 26px; padding: 11px 26px;
  background: var(--accent-soft); border: 1px solid var(--accent-line); border-radius: 24px;
  color: var(--accent-bright); font-weight: 600; font-size: 14px; cursor: pointer;
  font-family: var(--sans);
}
.quiz-score .s-btn:hover { background: var(--code-bg); }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .site-header { padding: 16px 5vw; }
  .site-header nav { display: none; }
  .hero { padding: 56px 5vw 40px; }
  .section { padding: 48px 5vw; }
  .hero-facts { gap: 22px; }
  .chapter-row { flex-direction: column; gap: 4px; }
  .chapter-row .cr-num { width: auto; }
  .module-grid { grid-template-columns: 1fr; }
  .site-footer { padding: 36px 5vw 44px; }
  .blog-main { padding: 56px 5vw 64px; }
  .chapter-nav { flex-direction: column; }
}

/* ---------- accessibility ---------- */
a:focus-visible, button:focus-visible, summary:focus-visible, .quiz-opt:focus-visible {
  outline: 2px solid var(--accent-bright); outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- print: force light reading ---------- */
@media print {
  html { background: #ffffff !important; }
  html[data-theme="dark"] {
    --bg: #ffffff; --bg-raise: #ffffff; --bg-soft: #f5f5f5; --bg-nav: #ffffff;
    --ink: #000000; --text: #111111; --muted: #444444; --faint: #666666;
    --accent: #7a5c1e; --accent-bright: #7a5c1e; --code-block-bg: #f7f7f7;
    --card: #ffffff; --card-border: #cccccc; --hr: #dddddd;
    --hero-ink: #000000;
  }
  .site-header, .site-footer, .theme-toggle, .header-right nav, .chapter-nav, .quiz-progress { display: none !important; }
  .post, .chapter-row, .module-card { break-inside: avoid; }
  a { color: #1a4d8f !important; text-decoration: underline; }
}

/* ---------- connections map ---------- */
.xmap {
  border-collapse: collapse;
  font-size: 12px;
  width: 100%;
  table-layout: fixed;
}
.xmap th, .xmap td {
  border: 1px solid var(--card-border);
  padding: 4px 2px;
  text-align: center;
}
.xmap th.xh {
  background: var(--bg-soft);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
  text-align: left;
  padding-left: 8px;
}
.xmap th.xh a { color: inherit; text-decoration: none; }
.xmap td a { color: inherit; text-decoration: none; display: block; }
.xmap td.x0 { background: transparent; }
.xmap td.x1 { background: rgba(122, 92, 30, 0.12); }
.xmap td.x2 { background: rgba(122, 92, 30, 0.28); }
.xmap td.x3 { background: rgba(122, 92, 30, 0.5); color: #fff; }
.xmap td.x4 { background: rgba(122, 92, 30, 0.78); color: #fff; }
.xties {
  border-collapse: collapse;
  font-size: 14px;
  margin: 8px 0 22px;
}
.xties th, .xties td {
  border: 1px solid var(--card-border);
  padding: 8px 14px;
  text-align: left;
}
.xties th { background: var(--bg-soft); font-weight: 600; }
.xties td.xc { text-align: right; font-variant-numeric: tabular-nums; font-weight: 700; color: var(--accent); }
.xties td.xarrow { color: var(--faint); text-align: center; }
.xties a { color: var(--accent); }
@media (max-width: 900px) {
  .xmap { font-size: 10px; }
  .xmap th.xh { max-width: 64px; }
}