/* =============================================================
   LinuxLore — styles
   A reading room for the Linux Documentation Project.
   ============================================================= */

/* ---------- design tokens ---------- */
:root {
  /* surface */
  --bg: #0a0c0f;
  --bg-elev: #11141a;
  --bg-elev-2: #181c24;
  --bg-elev-3: #1f2531;
  --bg-codeblock: #0d1117;
  --bg-hover: #161a22;
  --surface-gradient: radial-gradient(ellipse at top, #11141a 0%, #0a0c0f 60%);
  --grain-opacity: 0.015;

  /* lines */
  --border: #1f2632;
  --border-strong: #2b3344;
  --border-accent: #3a4658;

  /* text */
  --text: #e8edf3;
  --text-mute: #97a2b3;
  --text-dim: #5e6878;
  --text-faint: #3a4250;

  /* accents */
  --accent: #4ade80;            /* terminal green */
  --accent-strong: #6ee99c;
  --accent-glow: rgba(74, 222, 128, .18);
  --accent-soft: rgba(74, 222, 128, .12);
  --accent-bg: rgba(74, 222, 128, .07);

  --accent-2: #fbbf24;           /* warm amber */
  --accent-2-soft: rgba(251, 191, 36, .12);
  --accent-2-bg: rgba(251, 191, 36, .06);

  --accent-3: #60a5fa;           /* cool blue */
  --accent-3-soft: rgba(96, 165, 250, .12);

  --accent-4: #f472b6;           /* magenta */
  --accent-4-soft: rgba(244, 114, 182, .12);

  --link: #76d9ff;
  --link-hover: #a5e7ff;

  --danger: #f87171;
  --warning: #fbbf24;
  --info: #60a5fa;
  --tip: #4ade80;

  /* shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.5);
  --shadow-glow: 0 0 32px var(--accent-glow);

  /* typography */
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  --font-serif: 'Fraunces', Georgia, serif;

  /* layout */
  --content-max: 72ch;
  --sidebar-w: 280px;
  --rail-w: 200px;
  --header-h: 60px;
  --container-max: 1480px;

  /* radii */
  --r-sm: 4px;
  --r: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;

  /* easings */
  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-spring: cubic-bezier(.68, -.55, .27, 1.55);
}

[data-theme="light"] {
  --bg: #fbf8f1;
  --bg-elev: #f4eedd;
  --bg-elev-2: #ede5cf;
  --bg-elev-3: #e1d6b8;
  --bg-codeblock: #efe7d4;
  --bg-hover: #ede5cf;
  --surface-gradient: radial-gradient(ellipse at top, #f4eedd 0%, #fbf8f1 60%);
  --border: #d4c6a6;
  --border-strong: #b0a07e;
  --border-accent: #8c7c5a;
  --text: #1a1408;
  --text-mute: #5a4d30;
  --text-dim: #7a6d50;
  --text-faint: #9a8d70;
  --accent: #1e6f3a;
  --accent-strong: #144e28;
  --accent-soft: rgba(30, 111, 58, .12);
  --accent-bg: rgba(30, 111, 58, .06);
  --accent-glow: rgba(30, 111, 58, .14);
  --accent-2: #a25618;
  --accent-2-soft: rgba(162, 86, 24, .14);
  --accent-2-bg: rgba(162, 86, 24, .06);
  --accent-3: #1a5a8a;
  --accent-3-soft: rgba(26, 90, 138, .12);
  --accent-4: #8a2860;
  --accent-4-soft: rgba(138, 40, 96, .12);
  --link: #1a5a8a;
  --link-hover: #0d3a60;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  position: relative;
  font-feature-settings: 'ss01' on, 'cv11' on;
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: var(--surface-gradient);
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

a {
  color: var(--link);
  text-decoration: none;
  transition: color .12s var(--ease);
}
a:hover {
  color: var(--link-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

img, svg { max-width: 100%; }
kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-strong);
  color: var(--text-mute);
  vertical-align: 1px;
  box-shadow: 0 1px 0 var(--border-strong);
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 0 24px;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--text) !important;
  text-decoration: none !important;
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none !important; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: var(--r-sm);
  background: var(--accent-bg);
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  transition: transform .25s var(--ease-spring), background .15s;
}
.brand:hover .brand-mark { transform: rotate(-3deg) scale(1.05); background: var(--accent-soft); }
.brand-name-accent { color: var(--accent); }

.site-nav {
  display: flex;
  gap: 2px;
  margin-left: auto;
  margin-right: auto;
}
.site-nav a {
  color: var(--text-mute);
  font-size: 13.5px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--r-sm);
  text-decoration: none;
  position: relative;
  transition: color .12s, background .12s;
}
.site-nav a:hover { color: var(--text); background: var(--bg-elev); text-decoration: none; }
body[data-tome="home"] .site-nav a[data-tome-link="home"],
body[data-tome="intro-linux"] .site-nav a[data-tome-link="intro-linux"],
body[data-tome="gnu-tools"] .site-nav a[data-tome-link="gnu-tools"],
body[data-tome="abs-guide"] .site-nav a[data-tome-link="abs-guide"],
body[data-tome="bash-beginners"] .site-nav a[data-tome-link="bash-beginners"],
body[data-tome="dictionary"] .site-nav a[data-tome-link="dictionary"] {
  color: var(--accent);
  background: var(--accent-bg);
}

.site-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.theme-toggle, .search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text-mute);
  font-family: var(--font-sans);
  font-size: 13px;
  cursor: pointer;
  border-radius: var(--r-sm);
  padding: 6px 10px;
  transition: all .12s var(--ease);
}
.theme-toggle { padding: 6px; aspect-ratio: 1; }
.theme-toggle:hover, .search-trigger:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--bg-elev-2);
}
.search-trigger kbd { font-size: 10px; padding: 0 5px; border-color: var(--border); box-shadow: none; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 16px;
  top: 16px;
  z-index: 200;
  background: var(--accent);
  color: #06120a;
  padding: 8px 12px;
  border-radius: var(--r-sm);
}

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--rail-w);
  gap: 0;
  max-width: var(--container-max);
  margin: 0 auto;
}
.page-home .layout { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
.page-home .rail-wrap { display: none; }
.page-dictionary .layout { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
.page-dictionary .rail-wrap { display: none; }

.sidebar {
  position: sticky;
  top: var(--header-h);
  align-self: start;
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 24px 14px 32px 24px;
  border-right: 1px solid var(--border);
  font-size: 13.5px;
}
.sidebar::-webkit-scrollbar { width: 7px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.sidebar::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }

.main {
  padding: 32px 56px 96px 56px;
  min-width: 0;
  position: relative;
}

.rail-wrap {
  position: sticky;
  top: var(--header-h);
  align-self: start;
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 32px 20px 32px 8px;
  font-size: 12.5px;
}
.rail-wrap::-webkit-scrollbar { width: 4px; }
.rail-wrap::-webkit-scrollbar-thumb { background: var(--border); }

.rail .rail-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-dim);
  font-weight: 600;
  margin-bottom: 10px;
}
.rail ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.rail li a {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 4px 0 4px 12px;
  color: var(--text-mute);
  font-size: 12.5px;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: all .12s;
  text-decoration: none;
}
.rail li a:hover { color: var(--accent); }
.rail li a.active { color: var(--accent); border-left-color: var(--accent); background: linear-gradient(90deg, var(--accent-bg), transparent); }
.rail-num { font-family: var(--font-mono); font-size: 11px; color: var(--text-dim); }
.rail li a.active .rail-num { color: var(--accent); }

@media (max-width: 1200px) {
  .layout { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
  .rail-wrap { display: none; }
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 16px 16px 12px 16px;
  }
  .main { padding: 24px 20px 60px 20px; }
}

/* ---------- sidebar (TOC) ---------- */
.sidebar-inner { display: flex; flex-direction: column; }
.toc-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
  letter-spacing: -0.01em;
  padding-bottom: 4px;
}
.toc-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.toc-front-link, .toc-back, .toc-link {
  display: flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: var(--r-sm);
  color: var(--text-mute);
  font-weight: 500;
  font-size: 13px;
  margin: 1px 0;
  text-decoration: none;
  transition: all .12s;
}
.toc-front-link:hover, .toc-back:hover, .toc-link:hover {
  color: var(--accent);
  background: var(--accent-bg);
  text-decoration: none;
}
.toc-back {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  border-radius: 0;
  color: var(--text-dim);
  font-size: 12px;
}
.toc-list { display: flex; flex-direction: column; margin-top: 4px; }

.toc-chapters {
  list-style: none;
  padding: 0;
  margin: 8px 0 0 0;
}
.toc-chapters > li { margin: 0; }
.toc-chapters > li > a.toc-chap {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  color: var(--text);
  border-left: 2px solid transparent;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  text-decoration: none;
  font-weight: 500;
  line-height: 1.35;
  transition: all .12s;
}
.toc-chapters > li > a.toc-chap:hover {
  background: var(--bg-elev);
  color: var(--accent);
  border-left-color: var(--accent);
}
.toc-chapters > li > a.toc-chap.active {
  color: var(--accent);
  background: var(--accent-bg);
  border-left-color: var(--accent);
}
.toc-chapters .num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-dim);
  font-weight: 600;
  letter-spacing: .03em;
  min-width: 22px;
}
.toc-chap.active .num { color: var(--accent); }
.chap-title { flex: 1; min-width: 0; }

.toc-chapters ul {
  list-style: none;
  padding: 0;
  margin: 2px 0 8px 12px;
  border-left: 1px solid var(--border);
}
.toc-chapters ul li a {
  display: flex;
  gap: 6px;
  align-items: baseline;
  padding: 3px 8px 3px 12px;
  color: var(--text-mute);
  font-size: 12.5px;
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -1px;
  line-height: 1.35;
}
.toc-chapters ul li a:hover { color: var(--accent); border-left-color: var(--accent); }
.toc-chapters ul li a.active { color: var(--accent); border-left-color: var(--accent); }

/* dictionary sidebar */
.dict-sidebar .alpha-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 3px;
  margin: 10px 0;
}
.alpha {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-mute);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  text-decoration: none;
  font-size: 12.5px;
  transition: all .12s var(--ease);
}
.alpha:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-bg);
  text-decoration: none;
  transform: translateY(-1px);
}
.alpha.active {
  background: var(--accent);
  color: #06120a;
  border-color: var(--accent);
  font-weight: 700;
}
[data-theme="light"] .alpha.active { color: #fff; }
.dict-filter {
  width: 100%;
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  transition: border-color .12s;
}
.dict-filter::placeholder { color: var(--text-dim); }
.dict-filter:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ---------- reading progress bar ---------- */
.reading-progress {
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0;
  height: 2px;
  background: transparent;
  z-index: 90;
}
.reading-progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .1s linear;
}

/* ---------- page header / tome title ---------- */
.crumbs {
  font-size: 12.5px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: .01em;
}
.crumbs a { color: var(--text-mute); text-decoration: none; }
.crumbs a:hover { color: var(--accent); text-decoration: none; }
.crumbs .sep { color: var(--text-faint); }

.page-header {
  padding: 8px 0 28px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}
.tome-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.tome-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 12px 0;
  background: linear-gradient(180deg, var(--text) 0%, var(--text-mute) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.letter-title {
  display: flex; align-items: baseline; gap: 16px;
}
.letter-glyph-big {
  font-family: var(--font-display);
  font-size: clamp(56px, 8vw, 96px);
  font-weight: 700;
  color: var(--accent);
  -webkit-text-fill-color: var(--accent);
  background: none;
  line-height: 1;
}

.tome-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 12px;
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-mute);
}
.meta-icon {
  color: var(--accent);
  font-family: var(--font-mono);
  width: 14px;
  display: inline-block;
  text-align: center;
}

.tome-tagline {
  color: var(--text-mute);
  margin: 4px 0 0 0;
  font-size: 16px;
  font-family: var(--font-serif);
  font-style: italic;
  max-width: 64ch;
  font-weight: 400;
}

/* ---------- main content typography ---------- */
.main { font-size: 15.5px; }
.main p {
  max-width: var(--content-max);
  margin: 0 0 16px 0;
  line-height: 1.75;
  color: var(--text);
}
.main p:last-child { margin-bottom: 0; }

/* chapter blocks */
.chapter {
  padding-top: 64px;
  position: relative;
}
.chapter:first-of-type { padding-top: 8px; }
.chapter-rule {
  height: 1px;
  background: linear-gradient(90deg, var(--border) 0%, var(--accent-bg) 50%, var(--border) 100%);
  margin-bottom: 32px;
  max-width: 100%;
}
.chapter:first-of-type .chapter-rule { display: none; }
.chapter-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 16px;
  max-width: var(--content-max);
}
.chapter-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: .15em;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 4px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  border: 1px solid var(--accent-soft);
}
.chapter-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: .03em;
}
.chapter-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 24px 0;
  max-width: var(--content-max);
}
.chapter-intro { margin-bottom: 24px; }
.chapter-intro > p:first-child::first-letter {
  font-family: var(--font-serif);
  font-size: 3.4em;
  float: left;
  line-height: .85;
  padding: 6px 8px 0 0;
  color: var(--accent);
  font-weight: 600;
}

/* sections */
.section { margin-top: 40px; }
.section.depth-1 { margin-top: 56px; }
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.012em;
  margin: 0 0 16px 0;
  display: flex;
  align-items: baseline;
  gap: 12px;
  max-width: var(--content-max);
  scroll-margin-top: calc(var(--header-h) + 24px);
  position: relative;
}
h3.section-title { font-size: 24px; line-height: 1.2; }
h4.section-title { font-size: 19px; line-height: 1.3; }
h5.section-title { font-size: 16px; line-height: 1.35; color: var(--text-mute); }

.section-num {
  font-family: var(--font-mono);
  font-size: .65em;
  color: var(--accent-2);
  font-weight: 500;
  letter-spacing: 0;
  flex-shrink: 0;
  background: var(--accent-2-bg);
  padding: 2px 8px;
  border-radius: var(--r-sm);
  align-self: center;
}
.section-title-text { flex: 1; min-width: 0; }
.anchor {
  opacity: 0;
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: .6em;
  transition: opacity .15s;
  align-self: center;
}
.section-title:hover .anchor { opacity: 1; }
.anchor:hover { color: var(--accent); }

/* lists */
.main ul.list, .main ol.list {
  max-width: var(--content-max);
  padding-left: 1.5em;
  margin: 12px 0 20px 0;
}
.main li { margin: 6px 0; line-height: 1.65; padding-left: 4px; }
.main ul.list li::marker { color: var(--accent); }
.main ol.list li::marker { color: var(--accent-2); font-family: var(--font-mono); font-weight: 600; }

/* misc */
.main hr {
  border: none;
  border-top: 1px dashed var(--border);
  margin: 32px 0;
  max-width: var(--content-max);
}

/* inline code */
.main code, .main p code, .main li code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--bg-elev);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  word-break: break-word;
  overflow-wrap: anywhere;
}

/* code figure (block) */
.code-figure {
  position: relative;
  margin: 18px 0 22px 0;
  max-width: var(--content-max);
}
.code-figure pre {
  margin: 0;
  background: var(--bg-codeblock);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.55;
  position: relative;
}
.code-figure pre code {
  background: none;
  color: var(--text);
  border: none;
  padding: 0;
  white-space: pre;
  font-size: inherit;
  font-family: var(--font-mono);
}
.code-figure::before {
  content: '';
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-radius: var(--r) 0 0 var(--r);
  opacity: .7;
}
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text-mute);
  border-radius: var(--r-sm);
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s, all .12s;
}
.code-figure:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); }

/* callouts */
[class^="callout-"] {
  border-left: 3px solid;
  background: var(--bg-elev);
  padding: 14px 18px;
  border-radius: 0 var(--r) var(--r) 0;
  margin: 18px 0;
  max-width: var(--content-max);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
[class^="callout-"] .callout-kind {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}
[class^="callout-"] p { margin: 0; font-size: 14.5px; }
.callout-note      { border-color: var(--info);     background: rgba(96,165,250,.06); }
.callout-note .callout-kind     { color: var(--info); }
.callout-tip       { border-color: var(--tip);      background: rgba(74,222,128,.06); }
.callout-tip .callout-kind      { color: var(--tip); }
.callout-caution   { border-color: var(--warning);  background: rgba(251,191,36,.06); }
.callout-caution .callout-kind  { color: var(--warning); }
.callout-warning   { border-color: var(--danger);   background: rgba(248,113,113,.06); }
.callout-warning .callout-kind  { color: var(--danger); }
.callout-important { border-color: var(--accent-4); background: rgba(244,114,182,.06); }
.callout-important .callout-kind { color: var(--accent-4); }

/* blockquote */
blockquote {
  border-left: 3px solid var(--accent);
  margin: 18px 0;
  padding: 4px 0 4px 20px;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--text-mute);
  font-size: 17px;
  max-width: var(--content-max);
  line-height: 1.6;
}

/* inline heading (rare) */
.inline-heading {
  font-family: var(--font-display);
  font-size: 17px;
  margin: 24px 0 8px 0;
  color: var(--text);
  font-weight: 600;
}

/* front matter */
.front-section {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 24px 28px;
  margin-bottom: 24px;
  max-width: var(--content-max);
  font-size: 14px;
  color: var(--text-mute);
}
.front-heading {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 12px 0;
}
.front-section p { font-size: 14px; line-height: 1.7; margin-bottom: 12px; color: var(--text-mute); }
.front-section a { color: var(--link); }

/* ============================================================
   homepage
============================================================ */
.hero {
  padding: 64px 0 56px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 80px;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  top: 32px;
  right: -100px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  filter: blur(20px);
  pointer-events: none;
  z-index: -1;
  opacity: .6;
}
.hero-prompt {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-mute);
  margin-bottom: 28px;
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r);
  box-shadow: var(--shadow-sm);
}
.prompt-user { color: var(--accent); }
.prompt-sep { color: var(--text-dim); }
.prompt-path { color: var(--link); }
.prompt-cmd { color: var(--text); }
.prompt-cursor {
  color: var(--accent);
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 84px);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin: 0 0 28px 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  /* nope - body bg-gradient already gives texture */
}
.hero-title-line { color: var(--text); }
.hero-accent {
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 60%, var(--accent-4) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  position: relative;
}
.hero-lede {
  max-width: 62ch;
  font-size: 19px;
  color: var(--text-mute);
  line-height: 1.55;
  margin: 0 0 32px 0;
}
.hero-lede code {
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--bg-elev);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: .82em;
  border: 1px solid var(--border);
}
.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--r);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14.5px;
  text-decoration: none !important;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  transition: all .15s var(--ease);
}
.btn:hover {
  background: var(--bg-elev-2);
  border-color: var(--border-strong);
  text-decoration: none;
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--accent);
  color: #06120a;
  border-color: var(--accent);
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-strong);
  color: #06120a;
  border-color: var(--accent-strong);
  box-shadow: 0 6px 20px var(--accent-glow);
}
[data-theme="light"] .btn-primary { color: #fff; }
[data-theme="light"] .btn-primary:hover { color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 13px;
}
.btn-ghost:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.btn-ghost kbd {
  background: var(--bg-elev);
  border-color: var(--border);
  font-size: 11px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  max-width: 720px;
}
.hero-stat {
  background: var(--bg-elev);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.hero-stat-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -.02em;
}
.hero-stat-label {
  font-size: 11.5px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-family: var(--font-mono);
}
@media (max-width: 700px) { .hero-stats { grid-template-columns: repeat(2, 1fr); } }

.home-section { padding: 60px 0; }
.home-section:not(:last-child) { border-bottom: 1px solid var(--border); }
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--accent-2);
  margin-bottom: 12px;
  text-transform: uppercase;
}
.home-section h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.8vw, 40px);
  margin: 0 0 12px 0;
  font-weight: 700;
  letter-spacing: -0.024em;
  line-height: 1.1;
}
.section-sub {
  color: var(--text-mute);
  max-width: 60ch;
  margin: 0 0 36px 0;
  font-size: 16px;
  line-height: 1.6;
}
.section-sub em { font-style: italic; color: var(--text); }

/* tome grid */
.tome-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}
.tome-card {
  position: relative;
  padding: 24px 24px 22px 24px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  color: var(--text) !important;
  text-decoration: none !important;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all .25s var(--ease);
  overflow: hidden;
}
.tome-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--r-lg);
  padding: 1px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-4));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity .25s var(--ease);
}
.tome-card:hover::before { opacity: 1; }
.tome-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: radial-gradient(circle at top right, var(--accent-bg), transparent 60%);
  opacity: 0;
  transition: opacity .25s var(--ease);
  pointer-events: none;
}
.tome-card:hover {
  background: var(--bg-elev-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.tome-card:hover::after { opacity: 1; }

.tome-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
}
.tome-card-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  font-weight: 700;
  letter-spacing: .1em;
}
.tome-card-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--accent-2);
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 2px 8px;
  background: var(--accent-2-bg);
  border-radius: 999px;
  border: 1px solid var(--accent-2-soft);
}
.tome-card[data-accent="cyan"] .tome-card-tag { color: var(--accent-3); background: var(--accent-3-soft); border-color: var(--accent-3-soft); }
.tome-card[data-accent="amber"] .tome-card-tag { color: var(--accent-2); }
.tome-card[data-accent="magenta"] .tome-card-tag { color: var(--accent-4); background: var(--accent-4-soft); border-color: var(--accent-4-soft); }

.tome-card-icon {
  width: 56px; height: 56px;
  border-radius: var(--r);
  display: grid; place-items: center;
  background: var(--accent-bg);
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  margin-bottom: 10px;
  transition: transform .25s var(--ease);
}
.tome-card[data-accent="cyan"] .tome-card-icon { background: var(--accent-3-soft); color: var(--accent-3); border-color: var(--accent-3-soft); }
.tome-card[data-accent="amber"] .tome-card-icon { background: var(--accent-2-bg); color: var(--accent-2); border-color: var(--accent-2-soft); }
.tome-card[data-accent="magenta"] .tome-card-icon { background: var(--accent-4-soft); color: var(--accent-4); border-color: var(--accent-4-soft); }
.tome-card-icon svg { width: 28px; height: 28px; }
.tome-card:hover .tome-card-icon { transform: rotate(-3deg) scale(1.08); }

.tome-card-title {
  font-family: var(--font-display);
  font-size: 20px;
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.tome-card-author {
  color: var(--text-mute);
  font-size: 13px;
  margin: 0;
  font-family: var(--font-mono);
}
.tome-card-desc {
  color: var(--text-mute);
  font-size: 14px;
  margin: 8px 0 12px 0;
  line-height: 1.6;
  flex: 1;
}
.tome-card-meta {
  display: flex;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-dim);
  letter-spacing: .02em;
}
.tome-card-meta .dot { opacity: .5; }
.tome-card-arrow {
  position: absolute;
  bottom: 22px;
  right: 22px;
  color: var(--text-dim);
  transition: all .25s var(--ease);
}
.tome-card:hover .tome-card-arrow {
  color: var(--accent);
  transform: translateX(4px);
}

/* stats */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.stat-card {
  padding: 32px 24px;
  background: var(--bg-elev);
  text-align: left;
  position: relative;
  transition: background .15s;
}
.stat-card:hover { background: var(--bg-elev-2); }
.stat-num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
  letter-spacing: -.02em;
}
.stat-card:nth-child(2) .stat-num { color: var(--accent-2); }
.stat-card:nth-child(3) .stat-num { color: var(--accent-3); }
.stat-card:nth-child(4) .stat-num { color: var(--accent-4); }
.stat-label {
  color: var(--text-mute);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* paths */
.paths-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.path-card {
  padding: 22px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  position: relative;
}
.path-card .path-num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--accent);
  letter-spacing: .15em;
  font-weight: 700;
  margin-bottom: 8px;
}
.path-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 6px 0;
  letter-spacing: -.01em;
}
.path-desc { color: var(--text-mute); font-size: 13.5px; margin: 0 0 16px 0; }
.path-desc code { font-family: var(--font-mono); font-size: .9em; color: var(--accent); }
.path-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.path-list li { counter-increment: path; margin: 0; padding: 0; }
.path-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--r-sm);
  text-decoration: none;
  color: var(--text-mute);
  font-size: 13.5px;
  transition: all .12s;
}
.path-list li a::before {
  content: '↳';
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
}
.path-list li a:hover {
  color: var(--accent);
  background: var(--accent-bg);
  text-decoration: none;
  padding-left: 14px;
}

/* about */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 800px) { .about-grid { grid-template-columns: 1fr; } }
.about-prose p {
  font-size: 16.5px;
  color: var(--text-mute);
  margin: 0 0 16px 0;
  line-height: 1.7;
}
.about-prose strong { color: var(--text); }
.about-prose em { color: var(--text); font-style: italic; }
.about-callout {
  background: var(--accent-2-bg);
  border-left: 3px solid var(--accent-2);
  padding: 20px 22px;
  border-radius: 0 var(--r) var(--r) 0;
}
.callout-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 8px;
}
.about-callout p { margin: 0 0 10px 0; font-size: 14.5px; color: var(--text); line-height: 1.65; }
.about-callout p:last-child { margin: 0; }

/* how */
.how-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}
.how-card {
  padding: 22px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: all .15s;
}
.how-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-elev-2);
  transform: translateY(-1px);
}
.how-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .15em;
  margin-bottom: 8px;
}
.how-card h3 {
  font-family: var(--font-display);
  font-size: 17px;
  margin: 0 0 6px 0;
  font-weight: 600;
  letter-spacing: -.01em;
}
.how-card p {
  color: var(--text-mute);
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

/* colophon */
.colophon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}
.colophon-item {
  padding: 16px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.colophon-key {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-2);
  letter-spacing: .1em;
  text-transform: uppercase;
}
.colophon-val { color: var(--text-mute); font-size: 14px; line-height: 1.55; }
.colophon-val a { color: var(--link); }

/* ============================================================
   dictionary
============================================================ */
.letter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 10px;
  margin-bottom: 56px;
}
.letter-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  text-decoration: none !important;
  color: var(--text) !important;
  transition: all .15s var(--ease);
  position: relative;
}
.letter-card:hover {
  border-color: var(--accent);
  background: var(--bg-elev-2);
  transform: translateY(-1px);
  text-decoration: none;
}
.letter-card .letter-glyph {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  width: 36px;
  text-align: center;
  line-height: 1;
  letter-spacing: -.02em;
}
.letter-card .letter-meta { line-height: 1.2; flex: 1; }
.letter-card .letter-name { font-family: var(--font-mono); font-size: 11px; color: var(--text-mute); text-transform: uppercase; letter-spacing: .05em; }
.letter-card .letter-count { color: var(--text-dim); font-size: 12px; font-family: var(--font-mono); }
.letter-arrow {
  color: var(--text-dim);
  transition: all .15s;
  font-size: 16px;
}
.letter-card:hover .letter-arrow { color: var(--accent); transform: translateX(2px); }

.dict-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 0;
}
.dict-entry {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.dict-entry:last-child { border-bottom: none; }
.dict-term {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 16px;
  color: var(--accent);
  margin: 0 0 8px 0;
  scroll-margin-top: calc(var(--header-h) + 16px);
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.dict-term a { color: inherit; text-decoration: none; }
.dict-term a:hover { color: var(--accent-strong); text-decoration: none; }
.dict-source {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  font-weight: 400;
  letter-spacing: .02em;
}
.dict-def {
  margin: 0 0 0 0;
  color: var(--text);
  font-size: 14.5px;
}
.dict-def p {
  margin: 4px 0 8px 0;
  line-height: 1.65;
  color: var(--text);
}
.dict-def p:last-child { margin-bottom: 0; }
.dict-def code { font-size: .88em; }
.dict-def .missing { color: var(--text-dim); font-style: italic; }
.dict-section {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.dict-section h2 {
  font-family: var(--font-display);
  font-size: 24px;
  margin: 0 0 20px 0;
  font-weight: 700;
  letter-spacing: -.02em;
}

/* dict filtering */
.dict-list.filtering .dict-entry:not(.match) { display: none; }

/* ============================================================
   search modal
============================================================ */
.search-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: flex-start center;
  padding-top: 8vh;
  animation: fadeIn .15s var(--ease);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.search-modal[hidden] { display: none; }
.search-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.search-box {
  position: relative;
  width: min(720px, 92vw);
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  max-height: min(75vh, 720px);
  overflow: hidden;
  animation: slideUp .25s var(--ease);
}
@keyframes slideUp { from { transform: translateY(8px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.search-input-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-mute);
}
#search-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  outline: none;
  min-width: 0;
}
#search-input::placeholder { color: var(--text-dim); }
#search-close {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  cursor: pointer;
}
.search-meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-dim);
  padding: 8px 18px;
  border-bottom: 1px solid var(--border);
  min-height: 28px;
}
.search-results {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
.search-results::-webkit-scrollbar { width: 8px; }
.search-results::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.search-result {
  display: block;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  text-decoration: none !important;
  color: var(--text);
  border: 1px solid transparent;
  margin: 2px 0;
  transition: all .1s;
}
.search-result:hover, .search-result.active {
  background: var(--bg-elev-2);
  border-color: var(--border);
  text-decoration: none;
}
.search-result-tome {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--accent-2);
  letter-spacing: .1em;
  margin-bottom: 4px;
  text-transform: uppercase;
}
.search-result-title {
  font-weight: 600;
  font-size: 14.5px;
  margin-bottom: 4px;
  line-height: 1.3;
}
.search-result-title mark { background: var(--accent-soft); color: var(--accent); padding: 0 2px; border-radius: 2px; }
.search-result-preview {
  font-size: 12.5px;
  color: var(--text-mute);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-result-preview mark { background: var(--accent-2-soft); color: var(--accent-2); padding: 0 2px; border-radius: 2px; }
.search-help {
  display: flex;
  gap: 16px;
  padding: 10px 18px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}
.search-help kbd {
  font-size: 10px;
  margin-right: 4px;
  padding: 0 5px;
  background: var(--bg);
  border-color: var(--border);
  box-shadow: none;
}
.search-empty {
  padding: 36px 18px;
  text-align: center;
  color: var(--text-dim);
}
.search-empty-icon {
  font-size: 28px;
  margin-bottom: 8px;
  display: block;
}

/* ============================================================
   footer
============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 80px;
  padding: 48px 32px 32px 32px;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 32px;
}
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-brand .brand { margin-bottom: 8px; font-size: 18px; }
.footer-tagline { color: var(--text-mute); font-size: 13.5px; margin: 0; line-height: 1.55; max-width: 28ch; }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--accent);
  margin: 0 0 10px 0;
  font-weight: 700;
}
.footer-col a {
  display: block;
  color: var(--text-mute);
  font-size: 13.5px;
  margin: 4px 0;
  text-decoration: none;
}
.footer-col a:hover { color: var(--text); text-decoration: none; }
.footer-note { color: var(--text-dim); font-size: 12.5px; line-height: 1.55; margin: 0; }

/* ============================================================
   selection / focus
============================================================ */
::selection { background: var(--accent-soft); color: var(--accent-strong); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

:target {
  animation: targetFlash 1.6s ease-out 1;
}
@keyframes targetFlash {
  0% { background: var(--accent-soft); }
  100% { background: transparent; }
}

/* ============================================================
   mobile drawer
============================================================ */
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 6px;
  cursor: pointer;
  color: var(--text-mute);
  align-items: center;
  justify-content: center;
}
.menu-toggle:hover { color: var(--text); border-color: var(--border-strong); }

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 110;
  opacity: 0;
  transition: opacity .2s var(--ease);
  pointer-events: none;
}
.drawer-backdrop[hidden] { display: none; }
.drawer-backdrop.open { opacity: 1; pointer-events: auto; }

.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: min(320px, 88vw);
  height: 100dvh;
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 120;
  transform: translateX(-100%);
  transition: transform .25s var(--ease);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.mobile-drawer[hidden] { display: none; }
.mobile-drawer.open { transform: translateX(0); }

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.drawer-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}
.drawer-close {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 4px;
  color: var(--text-mute);
  cursor: pointer;
  display: grid;
  place-items: center;
}
.drawer-close:hover { color: var(--text); border-color: var(--border-strong); }

.drawer-nav {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}
.drawer-nav a {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  color: var(--text);
  font-weight: 500;
  text-decoration: none;
  font-size: 14.5px;
  transition: all .12s;
}
.drawer-nav a:hover { background: var(--bg-elev-2); color: var(--accent); text-decoration: none; }
body[data-tome="home"] .drawer-nav a[data-tome-link="home"],
body[data-tome="intro-linux"] .drawer-nav a[data-tome-link="intro-linux"],
body[data-tome="gnu-tools"] .drawer-nav a[data-tome-link="gnu-tools"],
body[data-tome="abs-guide"] .drawer-nav a[data-tome-link="abs-guide"],
body[data-tome="bash-beginners"] .drawer-nav a[data-tome-link="bash-beginners"],
body[data-tome="dictionary"] .drawer-nav a[data-tome-link="dictionary"] {
  color: var(--accent);
  background: var(--accent-bg);
}

.drawer-sidebar {
  flex: 1;
  overflow-y: auto;
  padding: 14px 14px 32px 14px;
}
.drawer-sidebar .sidebar-inner { display: block; }
.drawer-sidebar .toc-title { padding-top: 4px; }
.drawer-sidebar::-webkit-scrollbar { width: 4px; }
.drawer-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

body.drawer-open { overflow: hidden; }

/* ============================================================
   tablet (≤ 1200px): hide right rail
============================================================ */
@media (max-width: 1200px) {
  .layout,
  .page-home .layout,
  .page-dictionary .layout {
    grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  }
  .rail-wrap { display: none; }
}

/* ============================================================
   small tablet / large phone (≤ 900px): drawer mode
============================================================ */
@media (max-width: 900px) {
  :root {
    --content-max: 100%;
  }
  html, body { overflow-x: hidden; }
  .menu-toggle { display: inline-flex; }
  .site-nav { display: none; }
  .layout,
  .page-home .layout,
  .page-dictionary .layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .sidebar { display: none; }
  .rail-wrap { display: none; }
  .main {
    padding: 24px 20px 60px 20px;
    min-width: 0;
    max-width: 100vw;
  }
  .main p, .main ul.list, .main ol.list, .main blockquote,
  .code-figure, .front-section, [class^="callout-"] {
    max-width: 100%;
  }
  .site-header {
    gap: 10px;
    padding: 0 14px;
  }
  .brand { font-size: 16px; }
  .search-trigger {
    padding: 6px 8px;
  }
  .search-trigger span { display: none; }
  .search-trigger kbd { display: none; }
  .home-section { padding: 40px 0; }
  .hero { padding: 32px 0 40px 0; }
  .hero::before { display: none; }
  .hero-title { font-size: clamp(36px, 11vw, 56px); margin-bottom: 20px; }
  .hero-lede { font-size: 17px; }
  .hero-cta { gap: 10px; }
  .btn { padding: 10px 18px; font-size: 14px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-stat { padding: 14px 16px; }
  .hero-stat-num { font-size: 20px; }
  .hero-prompt {
    font-size: 12px;
    padding: 6px 10px;
    overflow-x: auto;
    white-space: nowrap;
    max-width: 100%;
  }

  .tome-grid { grid-template-columns: 1fr; gap: 12px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-card { padding: 22px 16px; }
  .stat-num { font-size: 30px; }
  .paths-grid { grid-template-columns: 1fr; }
  .how-grid { grid-template-columns: 1fr; }
  .colophon-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 20px; }

  /* page header */
  .page-header { padding: 4px 0 22px 0; margin-bottom: 28px; }
  .tome-title { font-size: clamp(28px, 8vw, 40px); }
  .tome-meta { gap: 12px; row-gap: 8px; font-size: 12px; }
  .tome-tagline { font-size: 14px; }

  /* chapters / sections */
  .chapter { padding-top: 40px; }
  .chapter-title { font-size: clamp(22px, 6vw, 30px); }
  .chapter-label-row { flex-direction: column; align-items: flex-start; gap: 6px; }
  h3.section-title { font-size: 20px; }
  h4.section-title { font-size: 17px; }

  /* drop cap takes too much room on mobile */
  .chapter-intro > p:first-child::first-letter {
    font-size: 2.6em;
    padding: 4px 6px 0 0;
  }

  /* code blocks: small padding, smaller font */
  .code-figure pre { font-size: 12.5px; padding: 12px 14px; }
  .copy-btn { opacity: 1; padding: 3px 8px; font-size: 10px; }

  /* dictionary */
  .alpha-grid { grid-template-columns: repeat(8, 1fr); }
  .letter-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .letter-card { padding: 12px 14px; gap: 10px; }
  .letter-glyph { font-size: 24px !important; width: 28px !important; }
  .dict-entry { padding: 14px 0; }
  .dict-term { font-size: 14.5px; }

  /* search modal */
  .search-modal { padding-top: 4vh; }
  .search-box { max-height: 88vh; width: 96vw; }
  #search-input { font-size: 15px; }

  /* footer */
  .site-footer { padding: 32px 18px 24px 18px; margin-top: 48px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .footer-brand { grid-column: 1 / -1; }

  /* reading progress: don't sit on top of content */
  .reading-progress { top: var(--header-h); }
}

/* ============================================================
   phone (≤ 500px): tighter still
============================================================ */
@media (max-width: 500px) {
  :root { --header-h: 54px; }
  .site-header { padding: 0 10px; gap: 8px; }
  .brand-name { display: none; }
  .brand-mark { width: 28px; height: 28px; }
  .main { padding: 20px 16px 48px 16px; }
  .hero-prompt { display: none; }
  .hero-title { font-size: clamp(32px, 10vw, 44px); }
  .hero-lede { font-size: 15.5px; }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 1px; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .alpha-grid { grid-template-columns: repeat(6, 1fr); }
  .letter-grid { grid-template-columns: 1fr; }
  .section-eyebrow { font-size: 10.5px; }
  .home-section h2 { font-size: clamp(24px, 7vw, 32px); margin-bottom: 24px; }
  .section-sub { font-size: 14.5px; margin-bottom: 24px; }
  .tome-card { padding: 18px; }
  .tome-card-title { font-size: 18px; }
  .tome-card-arrow { position: static; align-self: flex-end; }
  .crumbs { font-size: 11.5px; flex-wrap: wrap; gap: 4px; }
  .meta-item { font-size: 11.5px; }
  blockquote { font-size: 15px; }
}

/* Hide menu toggle on desktop */
@media (min-width: 901px) {
  .menu-toggle,
  .mobile-drawer,
  .drawer-backdrop { display: none !important; }
}

/* ============================================================
   reduced motion
============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .brand-cursor, .prompt-cursor { animation: none; }
}