/* ═══════════════════════════════════════════════════════════
   MedTerm — Design System
   Fonts: Cormorant Garamond (editorial) · DM Sans (UI) · JetBrains Mono (code)
   ═══════════════════════════════════════════════════════════ */

/* ── Custom Properties ── Light mode defaults ────────────── */
:root {
  /* Surfaces */
  --bg:          #f8f6f1;
  --bg-2:        #f0ede6;
  --surface:     #fffdf9;
  --surface-2:   #faf9f6;

  /* Borders */
  --border:      #e4ddd2;
  --border-s:    #ede7de;

  /* Typography */
  --text-1:      #1a1610;
  --text-2:      #5c5448;
  --text-3:      #9c9082;

  /* Brand accent — single warm terracotta, used for emphasis & actions */
  --accent:      oklch(0.64 0.085 30);   /* ≈ #c97570, large text / fills */
  --accent-ink:  oklch(0.55 0.115 32);   /* darker, AA for small text & links */
  --accent-soft: oklch(0.64 0.085 30 / .12);
  --focus-ring:  oklch(0.60 0.13 248);   /* cool blue, clearly visible on warm + dark */

  /* Shadows — warm, multi-layer */
  --sh-1: 0 1px 3px rgba(26,22,16,.06), 0 1px 2px rgba(26,22,16,.04);
  --sh-2: 0 3px 10px rgba(26,22,16,.07), 0 1px 3px rgba(26,22,16,.04);
  --sh-3: 0 6px 20px rgba(26,22,16,.09), 0 2px 6px rgba(26,22,16,.05);
  --sh-4: 0 12px 40px rgba(26,22,16,.10), 0 4px 12px rgba(26,22,16,.06);
  --sh-5: 0 20px 64px rgba(26,22,16,.12), 0 6px 18px rgba(26,22,16,.07);
  --sh-hover: 0 24px 80px rgba(26,22,16,.14), 0 8px 22px rgba(26,22,16,.08), 0 2px 5px rgba(26,22,16,.04);

  /* Graph (always dark) */
  --graph-bg:    #0d1118;
  --graph-bar:   rgba(8,10,16,.96);

  /* Misc */
  --nav-h:       62px;
  --radius:      10px;
  --radius-lg:   16px;
  --radius-xl:   22px;
  --ease-spring: cubic-bezier(.34,1.4,.64,1);
  --ease-out:    cubic-bezier(.2,.8,.4,1);

  /* Font families */
  --f-serif:  'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --f-sans:   'DM Sans', system-ui, -apple-system, sans-serif;
  --f-mono:   'JetBrains Mono', 'Fira Mono', monospace;
}

/* ── Dark Mode Overrides ─────────────────────────────────── */
[data-theme="dark"] {
  --bg:          #100f0b;
  --bg-2:        #1a1814;
  --surface:     #211f19;
  --surface-2:   #292520;

  --border:      #3c3830;
  --border-s:    #302c24;

  --text-1:      #ede8dc;
  --text-2:      #a09484;
  --text-3:      #6a5e50;

  /* Accent reads lighter on dark surfaces */
  --accent-ink:  oklch(0.74 0.10 32);
  --focus-ring:  oklch(0.70 0.12 248);

  --sh-1: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.22);
  --sh-2: 0 3px 10px rgba(0,0,0,.36), 0 1px 3px rgba(0,0,0,.24);
  --sh-3: 0 6px 20px rgba(0,0,0,.42), 0 2px 6px rgba(0,0,0,.28);
  --sh-4: 0 12px 40px rgba(0,0,0,.48), 0 4px 12px rgba(0,0,0,.32);
  --sh-5: 0 20px 64px rgba(0,0,0,.55), 0 6px 18px rgba(0,0,0,.36);
  --sh-hover: 0 24px 80px rgba(0,0,0,.6), 0 8px 22px rgba(0,0,0,.4), 0 2px 5px rgba(0,0,0,.3);

  --graph-bg:    #080c12;
  --graph-bar:   rgba(4,6,10,.97);
}

/* ── Reset & Base ────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  /* smooth theme switch */
  transition: color-scheme .3s;
}
body {
  font-family: var(--f-sans);
  background: var(--bg);
  color: var(--text-1);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color .35s var(--ease-out), color .25s var(--ease-out);
}

/* ── Keyboard focus — visible ring for every interactive element ── */
:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}
/* Override the id-level outline:none on the search fields */
#graphSearch:focus-visible,
#rootSearch:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}
/* Graph SVG nodes are focusable via script; keep ring crisp on dark */
.node:focus-visible circle,
.hub-node:focus-visible circle { outline: none; stroke: var(--focus-ring); stroke-width: 3; }

/* ── Respect reduced-motion: stop infinite ambient animation, keep instant state ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ═══════════════════════════════════════════════════════════
   TOP NAV
   ═══════════════════════════════════════════════════════════ */
.topnav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border-s);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  z-index: 200;
  box-shadow: var(--sh-1);
  transition: background-color .35s, border-color .35s, box-shadow .35s;
}

.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: inherit;
}
.brand-mark {
  width: 32px; height: 32px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-2);
  transition: background .2s, border-color .2s;
}
.brand-mark svg { width: 18px; height: 18px; }
.brand-name {
  font-family: var(--f-serif);
  font-size: 1.25rem; font-weight: 600;
  letter-spacing: -.01em;
  color: var(--text-1);
}
.beta-badge {
  font-family: var(--f-mono);
  font-size: .55rem; font-weight: 600; letter-spacing: .08em;
  padding: 2px 6px; border-radius: 4px;
  background: linear-gradient(135deg, rgba(201,117,112,.15), rgba(146,120,204,.15));
  border: 1px solid rgba(201,117,112,.35);
  color: #c97570;
  align-self: center;
  transition: background .35s, border-color .35s;
}
[data-theme="dark"] .beta-badge {
  background: linear-gradient(135deg, rgba(201,117,112,.2), rgba(146,120,204,.2));
  border-color: rgba(201,117,112,.45);
}

/* Tabs — underline style */
.nav-tabs {
  display: flex; align-items: stretch; gap: 0;
  height: 100%;
}
.tab {
  position: relative;
  display: flex; align-items: center; gap: 5px;
  padding: 0 16px;
  border: none; background: transparent;
  font-family: var(--f-sans); font-size: .875rem; font-weight: 400;
  color: var(--text-3); cursor: pointer;
  transition: color .18s;
  white-space: nowrap;
}
.tab::after {
  content: '';
  position: absolute; bottom: 0; left: 12px; right: 12px;
  height: 2px; border-radius: 2px 2px 0 0;
  background: var(--text-1);
  transform: scaleX(0);
  transition: transform .22s var(--ease-spring);
}
.tab:hover { color: var(--text-2); }
.tab.active { color: var(--text-1); font-weight: 500; }
.tab.active::after { transform: scaleX(1); }

/* Theme toggle */
.theme-toggle {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1.5px solid var(--border); background: var(--surface-2);
  color: var(--text-2); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background .2s, border-color .2s, transform .3s var(--ease-spring);
}
.theme-toggle:hover {
  background: var(--bg-2); border-color: var(--text-3);
  transform: rotate(22deg) scale(1.08);
}
.theme-toggle svg { width: 16px; height: 16px; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }
[data-theme="dark"]  .icon-moon { display: none; }
[data-theme="dark"]  .icon-sun  { display: block; }

/* ═══════════════════════════════════════════════════════════
   VIEW SHELL
   ═══════════════════════════════════════════════════════════ */
.view { display: none; }
.view.active { display: block; }

/* Non-map views inherit top padding */
#rootsView, #topicsView, #practiceView { padding-top: var(--nav-h); min-height: 100vh; }

/* ═══════════════════════════════════════════════════════════
   MAP VIEW — Hero + sticky full-screen graph
   ═══════════════════════════════════════════════════════════ */
#mapView.active { display: block; }

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  padding-top: var(--nav-h);
  display: flex; align-items: center; justify-content: center;
  background-color: var(--bg);
  overflow: hidden;
  transition: background-color .35s;
}

/* Dot-grid full background */
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(var(--border-s) 1.5px, transparent 1.5px);
  background-size: 28px 28px;
  opacity: .6;
  pointer-events: none; z-index: 0;
}

/* Coloured orbs */
.hero-orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); pointer-events: none; z-index: 0;
  will-change: transform;            /* cache the blurred bitmap; animate transform only */
  transform: translateZ(0);
}
.hero-orb-1 {
  width: 600px; height: 600px;
  top: -120px; right: -80px;
  background: radial-gradient(circle, rgba(201,117,112,.22) 0%, transparent 70%);
  animation: orb-drift 18s ease-in-out infinite alternate;
}
.hero-orb-2 {
  width: 500px; height: 500px;
  bottom: -100px; left: -60px;
  background: radial-gradient(circle, rgba(100,146,200,.18) 0%, transparent 70%);
  animation: orb-drift 22s ease-in-out infinite alternate-reverse;
}
.hero-orb-3 {
  width: 360px; height: 360px;
  top: 40%; left: 40%;
  background: radial-gradient(circle, rgba(146,120,204,.12) 0%, transparent 70%);
  animation: orb-drift 14s ease-in-out infinite alternate;
}
@keyframes orb-drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(40px, 30px) scale(1.08); }
}
[data-theme="dark"] .hero-orb-1 { background: radial-gradient(circle, rgba(201,117,112,.32) 0%, transparent 70%); }
[data-theme="dark"] .hero-orb-2 { background: radial-gradient(circle, rgba(100,146,200,.26) 0%, transparent 70%); }
[data-theme="dark"] .hero-orb-3 { background: radial-gradient(circle, rgba(146,120,204,.18) 0%, transparent 70%); }

.hero-inner {
  position: relative; z-index: 1;
  max-width: 760px; width: 100%;
  padding: 60px 32px;
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
}

/* Kicker pill */
.hero-kicker-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 20px; margin-bottom: 32px;
  border: 1px solid var(--border); background: var(--surface);
  font-family: var(--f-mono); font-size: .7rem; font-weight: 400;
  letter-spacing: .14em; text-transform: uppercase; color: var(--text-3);
  box-shadow: var(--sh-1);
  animation: hero-up .6s ease both;
}
.hkp-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #c97570; flex-shrink: 0;
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .4; transform: scale(.7); }
}

/* Headline */
.hero-headline {
  font-family: var(--f-serif);
  font-size: clamp(4rem, 9vw, 7.5rem);
  font-weight: 600; line-height: 1.0;
  letter-spacing: -.03em;
  color: var(--text-1);
  margin-bottom: 24px;
  display: flex; flex-direction: column; align-items: center; gap: 0;
  animation: hero-up .7s .08s ease both;
}
.hl-line { display: block; }
.hl-brand {
  display: block;
  font-family: var(--f-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 600; letter-spacing: .06em;
  color: var(--text-1); margin-bottom: 6px;
}
.hl-brand em {
  font-style: italic;
  color: var(--accent-ink);
}
.hl-accent {
  display: block;
  font-style: italic;
  color: var(--accent-ink);
  text-shadow: 0 1px 40px var(--accent-soft);
}

.hero-sub {
  font-size: clamp(.95rem, 1.8vw, 1.1rem); line-height: 1.65;
  color: var(--text-2); max-width: 480px; margin-bottom: 44px;
  animation: hero-up .65s .18s ease both;
}

/* Stats panel */
.hero-stats {
  display: flex; align-items: center; gap: 0;
  background: var(--surface); border: 1px solid var(--border-s);
  border-radius: var(--radius-xl); box-shadow: var(--sh-3);
  overflow: hidden; margin-bottom: 36px; width: 100%; max-width: 600px;
  animation: hero-up .65s .28s ease both;
  transition: background .35s, border-color .35s, box-shadow .35s;
}
.hstat {
  flex: 1; padding: 24px 20px; text-align: center;
  transition: background .18s;
}
.hstat:hover { background: var(--bg-2); }
.hstat strong {
  display: block;
  font-family: var(--f-serif); font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700; line-height: 1; color: var(--text-1);
  letter-spacing: -.02em; margin-bottom: 6px;
}
.hstat-label {
  font-family: var(--f-mono); font-size: .62rem; font-weight: 400;
  letter-spacing: .1em; text-transform: uppercase; color: var(--text-3);
}
.hstat-sep {
  width: 1px; align-self: stretch;
  background: var(--border-s); flex-shrink: 0;
}

.learner-count {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: .88rem; color: var(--text-2); margin-bottom: 20px;
  animation: hero-up .6s .32s ease both;
}
.learner-count svg { width: 15px; height: 15px; flex-shrink: 0; }
#learnerNum {
  font-weight: 600; color: var(--text-1);
  font-variant-numeric: tabular-nums;
}

.hero-credit {
  font-size: .88rem; color: var(--text-2); margin-bottom: 24px;
  animation: hero-up .6s .36s ease both;
}
.hero-credit a {
  font-weight: 600; text-decoration: none;
  color: var(--accent-ink);
  border-bottom: 1.5px solid var(--accent-soft);
  transition: border-color .18s, color .18s;
}
.hero-credit a:hover { border-color: var(--accent-ink); color: var(--accent); }

/* Entrance animation */
@keyframes hero-up {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}

.scroll-cue {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 24px;
  border: 1px solid var(--border); background: transparent;
  font-size: .82rem; color: var(--text-3); cursor: pointer;
  transition: color .18s, border-color .18s, transform .2s;
  animation: hero-up .6s .44s ease both, cue-bob 2.8s .9s ease-in-out infinite;
}
.scroll-cue svg { width: 16px; height: 16px; }
.scroll-cue:hover {
  color: var(--text-1); border-color: var(--text-2);
  animation: none; transform: translateY(-2px);
}
@keyframes cue-bob {
  0%, 55%, 100% { transform: translateY(0); }
  28% { transform: translateY(-5px); }
}

/* ── Graph area — sticky, always dark ───────────────────── */
.graph-area {
  position: sticky; top: var(--nav-h);
  height: calc(100vh - var(--nav-h));
  display: flex; flex-direction: column;
  background: var(--graph-bg);
  z-index: 10; overflow: hidden;
  transition: background .35s;
}

.graph-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 18px; flex-shrink: 0;
  background: var(--graph-bar);
  border-bottom: 1px solid rgba(255,255,255,.05);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  flex-wrap: wrap;
  overflow: visible; z-index: 20;
}
/* Scheme toggle (Category / Root Word) */
.scheme-toggle {
  display: flex; align-items: center; gap: 2px;
  background: rgba(255,255,255,.06); border-radius: 20px;
  padding: 3px; border: 1px solid rgba(255,255,255,.1); flex-shrink: 0;
}
.sch-btn {
  display: flex; align-items: center; gap: 4px;
  padding: 4px 12px; border-radius: 16px; border: none; background: transparent;
  color: rgba(255,255,255,.45); font-family: var(--f-sans); font-size: .78rem;
  cursor: pointer; transition: color .2s, background .2s, box-shadow .2s; white-space: nowrap;
}
.sch-btn .sch-vi { font-weight: 500; }
.sch-btn .sch-en { font-size: .68rem; opacity: .7; }
.sch-btn:hover { color: rgba(255,255,255,.8); }
.sch-btn.active {
  background: rgba(255,255,255,.14); color: rgba(255,255,255,.92);
  box-shadow: 0 1px 4px rgba(0,0,0,.3);
}

#graphSearch {
  padding: 7px 14px; border-radius: 20px; width: 200px;
  border: 1px solid rgba(255,255,255,.1); background: rgba(255,255,255,.06);
  color: rgba(255,255,255,.85); font-family: var(--f-sans); font-size: .82rem;
  outline: none; transition: border-color .18s, background .18s;
}
#graphSearch::placeholder { color: rgba(255,255,255,.28); }
#graphSearch:focus { border-color: rgba(255,255,255,.25); background: rgba(255,255,255,.1); }

.graph-filter { display: flex; gap: 6px; flex-wrap: wrap; }
.gf-btn {
  padding: 4px 12px; border-radius: 14px;
  border: 1px solid rgba(255,255,255,.1); background: transparent;
  color: rgba(255,255,255,.45); font-size: .74rem; cursor: pointer;
  transition: color .18s, background .18s, border-color .18s;
  position: relative;
}
.gf-btn:hover { background: rgba(255,255,255,.08); color: rgba(255,255,255,.8); }
.gf-btn.active { color: var(--bg); border-color: transparent; }

.gf-btn[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute; top: calc(100% + 8px); left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: rgba(20,18,14,.97); color: rgba(255,255,255,.92);
  font-size: .72rem; font-family: var(--f-sans); font-weight: 500;
  white-space: nowrap; padding: 6px 12px; border-radius: 8px;
  border: 1px solid rgba(255,255,255,.14);
  box-shadow: 0 4px 16px rgba(0,0,0,.5);
  pointer-events: none; opacity: 0;
  transition: opacity .18s, transform .18s;
  z-index: 9999;
}
.gf-btn[data-tooltip]:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.graph-reset {
  margin-left: auto; flex-shrink: 0;
  width: 32px; height: 32px; border-radius: 8px;
  border: 1px solid rgba(255,255,255,.1); background: transparent;
  color: rgba(255,255,255,.4); cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: color .18s, background .18s, border-color .18s;
}
.graph-reset:hover { background: rgba(255,255,255,.08); color: rgba(255,255,255,.8); }
.graph-reset svg { width: 15px; height: 15px; }

#graphSvg { flex: 1; width: 100%; display: block; }
.graph-hint {
  flex-shrink: 0; text-align: center;
  font-size: .68rem; color: rgba(255,255,255,.17); padding: 5px;
  letter-spacing: .03em;
}

/* D3 node & link styles */
.node circle { cursor: pointer; stroke-width: 1.5; }
.node text {
  pointer-events: none; fill: rgba(255,255,255,.78);
  font-size: 10.5px; font-family: var(--f-sans);
}
.node.dimmed circle { opacity: .12; }
.node.dimmed text { opacity: .07; }
.node.root-lit circle {
  stroke-width: 2.5;
  filter: drop-shadow(0 0 7px currentColor);
}
.link { stroke: rgba(255,255,255,.06); stroke-width: 1; }
.link.dimmed { opacity: .02; }
.link.root-lit { stroke: rgba(255,255,255,.28); stroke-width: 1.5; }

/* Related-term connector lines drawn on node click */
.rel-link {
  stroke: rgba(255,255,255,.55);
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
  pointer-events: none;
}

/* Selected (clicked) node glow */
.node.selected circle {
  stroke-width: 3;
  filter: drop-shadow(0 0 10px currentColor);
}

/* Hub nodes in root-word scheme */
.hub-node { cursor: pointer; }
.hub-node circle {
  stroke-width: 1.5;
  transition: filter .2s;
}
.hub-node:hover circle { filter: drop-shadow(0 0 10px rgba(255,255,255,.5)); }
.hub-node text {
  pointer-events: none;
  font-family: 'JetBrains Mono', monospace;
  fill: rgba(200,192,176,.85);
}

/* ── Term Drawer ─────────────────────────────────────────── */
.term-drawer {
  position: fixed;
  right: 0; top: var(--nav-h); bottom: 0;
  width: 370px;
  background: var(--surface);
  border-left: 1px solid var(--border-s);
  box-shadow: var(--sh-5);
  transform: translateX(100%);
  transition: transform .3s var(--ease-out), background .35s, border-color .35s;
  z-index: 150; overflow-y: auto;
}
.term-drawer.open { transform: translateX(0); }
[data-theme="dark"] .term-drawer {
  background: rgba(28,26,20,.96);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-left-color: rgba(255,255,255,.06);
}

.drawer-close {
  position: sticky; top: 0; z-index: 1;
  float: right; margin: 16px 16px 0 0;
  width: 32px; height: 32px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface-2);
  color: var(--text-3); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: color .18s, background .18s, border-color .18s;
}
.drawer-close:hover { background: var(--bg-2); color: var(--text-1); border-color: var(--text-3); }
.drawer-close svg { width: 14px; height: 14px; }
.drawer-body { padding: 16px 22px 36px; clear: both; }

/* Shared term detail */
.d-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .68rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  padding: 3px 10px; border-radius: 20px; margin-bottom: 14px;
}
.d-en {
  font-family: var(--f-serif);
  font-size: 2rem; font-weight: 600; letter-spacing: -.02em;
  color: var(--text-1); line-height: 1.1; margin-bottom: 4px;
}
.d-pron {
  font-family: var(--f-mono); font-size: .82rem; color: var(--text-3);
  margin-bottom: 6px; letter-spacing: .02em;
}
.d-vi { font-size: .95rem; font-weight: 500; color: var(--text-2); margin-bottom: 16px; }
.d-def {
  font-size: .86rem; line-height: 1.7; color: var(--text-2);
  padding: 14px 16px; border-radius: var(--radius);
  background: var(--bg-2); border: 1px solid var(--border-s);
  margin-bottom: 20px;
  transition: background .35s, border-color .35s;
}
.d-label {
  font-size: .64rem; font-weight: 600; letter-spacing: .15em; text-transform: uppercase;
  color: var(--text-3); margin-bottom: 10px;
}
.roots-pills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.root-pill {
  padding: 9px 13px; border-radius: var(--radius);
  background: var(--surface-2); border: 1.5px solid var(--border);
  cursor: pointer; text-align: left; display: block;
  transition: background .18s, border-color .2s, transform .22s var(--ease-spring), box-shadow .2s;
  position: relative; overflow: hidden;
}
.root-pill::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.06) 0%, transparent 60%);
  pointer-events: none;
}
.root-pill:hover {
  background: var(--bg); border-color: var(--text-3);
  transform: translateY(-3px) perspective(400px) rotateX(4deg);
  box-shadow: var(--sh-3);
}
.rp-hint {
  display: block; font-size: .6rem; font-weight: 600; letter-spacing: .12em;
  text-transform: uppercase; color: var(--text-3); margin-bottom: 3px;
  transition: color .18s;
}
.root-pill:hover .rp-hint { color: var(--text-2); }
.rp-part {
  display: block; font-family: var(--f-mono); font-size: .85rem;
  font-weight: 600; color: var(--text-1);
}
.rp-vi { display: block; font-size: .75rem; color: var(--text-3); margin-top: 1px; }

.related-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.related-chip {
  padding: 4px 12px; border-radius: 20px;
  border: 1px solid var(--border); background: transparent;
  font-size: .78rem; cursor: pointer; color: var(--text-2);
  transition: background .18s, border-color .18s;
}
.related-chip:hover { background: var(--bg-2); border-color: var(--text-3); }

/* Root Focus mode */
.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 20px; margin-bottom: 18px;
  border: 1px solid var(--border); background: transparent;
  font-size: .78rem; color: var(--text-2); cursor: pointer;
  transition: background .18s, color .18s;
}
.back-btn:hover { background: var(--bg-2); color: var(--text-1); }

.rf-hero {
  border-radius: var(--radius-lg); padding: 22px 24px;
  margin-bottom: 14px; position: relative; overflow: hidden;
  /* always dark card regardless of theme */
  background: #15131c;
  border: 1px solid rgba(255,255,255,.07);
}
/* Watermark */
.rf-hero::before {
  content: attr(data-part);
  position: absolute; right: -12px; top: -16px;
  font-family: var(--f-serif); font-size: 6rem; font-weight: 700;
  color: rgba(255,255,255,.05); pointer-events: none;
  line-height: 1; letter-spacing: -.04em; user-select: none;
}
.rf-part {
  font-family: var(--f-mono); font-size: 1.8rem; font-weight: 600;
  color: rgba(255,255,255,.9); letter-spacing: -.02em; margin-bottom: 6px;
}
.rf-meaning { font-size: .84rem; color: rgba(255,255,255,.55); }
.rf-meaning em { font-style: italic; }
.rf-count { font-size: .72rem; color: rgba(255,255,255,.28); margin: 4px 0 16px; }
.rf-list { display: flex; flex-direction: column; gap: 8px; }
.rf-card {
  padding: 11px 14px 11px 28px; border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-2); cursor: pointer; position: relative;
  transition: background .18s, border-color .18s, box-shadow .2s, transform .2s var(--ease-spring);
}
.rf-card::before {
  content: ''; position: absolute; left: 13px; top: 15px;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cat, var(--text-3));
}
.rf-card:hover {
  background: var(--surface); border-color: var(--text-3); box-shadow: var(--sh-2);
  transform: translateX(3px);
}
.rf-en { font-size: .92rem; font-weight: 600; color: var(--text-1); margin-bottom: 2px; }
.rf-vi { font-size: .8rem; color: var(--text-2); margin-bottom: 2px; }
.rf-pron { font-family: var(--f-mono); font-size: .72rem; color: var(--text-3); }

/* Root highlight mark inside word text */
mark.root-hl {
  background: transparent; padding: 0;
  color: #d4824a;
  font-weight: 700; border-bottom: 2px solid currentColor;
}
[data-theme="dark"] mark.root-hl { color: #e8956a; }

/* ═══════════════════════════════════════════════════════════
   ROOTS VIEW
   ═══════════════════════════════════════════════════════════ */
#rootsView { background: var(--bg); transition: background .35s; }
.roots-layout {
  display: grid; grid-template-columns: 280px 1fr;
  height: calc(100vh - var(--nav-h)); overflow: hidden;
}

.roots-sidebar {
  background: #100f0b;
  display: flex; flex-direction: column; gap: 12px;
  padding: 22px 16px; overflow: hidden;
  border-right: 1px solid rgba(255,255,255,.04);
}
.sidebar-label {
  font-family: var(--f-mono); font-size: .64rem; font-weight: 400;
  letter-spacing: .15em; text-transform: uppercase;
  color: rgba(255,255,255,.3); flex-shrink: 0;
}
.sidebar-search {
  padding: 7px 14px; border-radius: 20px; flex-shrink: 0;
  border: 1px solid rgba(255,255,255,.1); background: rgba(255,255,255,.06);
  color: rgba(255,255,255,.8); font-family: var(--f-sans); font-size: .82rem;
  outline: none; transition: border-color .18s, background .18s;
}
.sidebar-search::placeholder { color: rgba(255,255,255,.25); }
.sidebar-search:focus { border-color: rgba(255,255,255,.22); background: rgba(255,255,255,.1); }
.root-items { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 2px;
  scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.1) transparent; }

.root-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; border: none; border-radius: 8px;
  background: transparent; color: rgba(255,255,255,.55);
  cursor: pointer; text-align: left; width: 100%;
  transition: background .15s, color .15s;
}
.root-item:hover { background: rgba(255,255,255,.07); color: rgba(255,255,255,.85); }
.root-item.active { background: rgba(255,255,255,.1); color: rgba(255,255,255,.9); }
.ri-part { font-family: var(--f-mono); font-size: .85rem; font-weight: 600; flex: 0 0 88px; }
.ri-vi { font-size: .74rem; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; opacity: .6; }
.ri-count {
  font-size: .65rem; font-weight: 600; flex-shrink: 0;
  background: rgba(255,255,255,.1); padding: 2px 7px; border-radius: 10px; color: rgba(255,255,255,.5);
}

.roots-main {
  overflow-y: auto; padding: 36px 40px;
  background: var(--bg); transition: background .35s;
}
.roots-welcome { max-width: 540px; padding-top: 10px; }
.roots-welcome p { font-size: .93rem; color: var(--text-2); line-height: 1.75; margin-bottom: 10px; }
.roots-welcome em { font-style: normal; font-family: var(--f-mono); font-weight: 600; color: var(--text-1); }

/* Root detail */
.root-detail-hero {
  border-radius: var(--radius-xl); padding: 32px 36px;
  margin-bottom: 28px; position: relative; overflow: hidden;
  background: #15131c;
  border: 1px solid rgba(255,255,255,.07);
  box-shadow: var(--sh-5);
}
/* Giant decorative watermark */
.root-detail-hero::before {
  content: attr(data-part);
  position: absolute; right: -8px; top: -18px;
  font-family: var(--f-serif); font-size: 10rem; font-weight: 700;
  color: rgba(255,255,255,.04); pointer-events: none;
  line-height: 1; letter-spacing: -.05em; user-select: none;
}
.rdh-part {
  font-family: var(--f-mono); font-size: 2.8rem; font-weight: 600;
  color: rgba(255,255,255,.92); letter-spacing: -.03em; margin-bottom: 10px;
}
.rdh-meanings { font-size: .95rem; color: rgba(255,255,255,.65); margin-bottom: 6px; }
.rdm-vi { font-weight: 600; }
.rdm-sep { margin: 0 10px; opacity: .3; }
.rdm-en { font-style: italic; opacity: .75; }
.rdh-count { font-size: .74rem; color: rgba(255,255,255,.3); }

.root-detail-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px;
}
.rdc {
  background: var(--surface); border-radius: var(--radius-lg);
  border: 1px solid var(--border); padding: 16px 18px;
  cursor: pointer; position: relative; overflow: hidden;
  transition: transform .3s var(--ease-spring), box-shadow .3s, background .2s;
}
.rdc::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(255,255,255,.04) 0%, transparent 50%);
  pointer-events: none;
}
.rdc:hover {
  transform: perspective(600px) rotateX(2.5deg) translateY(-7px);
  box-shadow: var(--sh-hover);
}
.rdc-cat {
  font-size: .64rem; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; display: block; margin-bottom: 7px;
}
.rdc-en {
  font-family: var(--f-serif); font-size: 1.15rem; font-weight: 600;
  color: var(--text-1); margin-bottom: 3px; letter-spacing: -.01em;
}
.rdc-vi { font-size: .83rem; color: var(--text-2); margin-bottom: 3px; font-weight: 500; }
.rdc-pron { font-family: var(--f-mono); font-size: .7rem; color: var(--text-3); }

/* ═══════════════════════════════════════════════════════════
   TOPICS VIEW
   ═══════════════════════════════════════════════════════════ */
#topicsView { background: var(--bg); transition: background .35s; }
.topics-layout {
  display: grid; grid-template-columns: 252px 1fr;
  min-height: calc(100vh - var(--nav-h));
}
.topics-sidebar {
  background: var(--surface); border-right: 1px solid var(--border-s);
  padding: 24px 16px; transition: background .35s, border-color .35s;
}
.sidebar-label { /* already defined above */
  display: block; /* override in topics sidebar */
  font-family: var(--f-mono); font-size: .64rem;
  letter-spacing: .15em; text-transform: uppercase; color: var(--text-3);
  margin-bottom: 14px; padding-left: 8px;
}

.category-list { display: flex; flex-direction: column; gap: 3px; }
.cat-btn {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px;
  border: none; border-radius: var(--radius); background: transparent;
  color: var(--text-2); font-size: .86rem; cursor: pointer; text-align: left; width: 100%;
  transition: background .15s, color .15s;
}
.cat-btn:hover { background: var(--bg-2); color: var(--text-1); }
.cat-btn.active { background: var(--bg-2); color: var(--text-1); font-weight: 500; }
.cat-ico {
  width: 30px; height: 30px; border-radius: 8px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.cat-ico svg { width: 15px; height: 15px; }
.cat-count { margin-left: auto; font-size: .7rem; font-weight: 600; color: var(--text-3); }

.topics-main { padding: 30px 34px; }
.topics-header { margin-bottom: 24px; }
.topics-header h2 {
  font-family: var(--f-serif); font-size: 1.6rem; font-weight: 600;
  letter-spacing: -.015em; margin-bottom: 4px;
}
.topics-header p { font-size: .88rem; color: var(--text-2); }

.term-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; }
.term-card {
  background: var(--surface); border-radius: var(--radius-lg);
  border: 1px solid var(--border); border-top-width: 3px; padding: 16px 18px;
  cursor: pointer; position: relative; overflow: hidden;
  transition: transform .3s var(--ease-spring), box-shadow .3s, background .2s;
}
.term-card::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(255,255,255,.06) 0%, transparent 45%);
  pointer-events: none;
}
.term-card:hover {
  transform: perspective(700px) rotateX(2.5deg) translateY(-7px);
  box-shadow: var(--sh-hover);
}
.tc-en { font-family: var(--f-serif); font-size: 1.1rem; font-weight: 600; color: var(--text-1); letter-spacing: -.01em; margin-bottom: 3px; }
.tc-vi { font-size: .83rem; font-weight: 500; color: var(--text-2); margin-bottom: 5px; }
.tc-pron { font-family: var(--f-mono); font-size: .72rem; color: var(--text-3); margin-bottom: 10px; }
.tc-roots { display: flex; flex-wrap: wrap; gap: 4px; }
.tc-root {
  font-family: var(--f-mono); font-size: .66rem;
  padding: 2px 7px; border-radius: 10px;
  background: var(--bg-2); border: 1px solid var(--border-s); color: var(--text-3);
}

/* Term modal */
.term-modal-bg {
  position: fixed; inset: 0; background: rgba(10,8,4,.45);
  display: flex; align-items: center; justify-content: center;
  z-index: 300; opacity: 0; pointer-events: none; transition: opacity .22s;
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}
.term-modal-bg.open { opacity: 1; pointer-events: all; }
.term-modal {
  background: var(--surface); border-radius: var(--radius-xl);
  width: min(520px, 92vw); max-height: 88vh; overflow-y: auto;
  position: relative; box-shadow: var(--sh-5);
  border: 1px solid var(--border-s);
  transform: translateY(18px) scale(.98); transition: transform .22s var(--ease-spring);
}
.term-modal-bg.open .term-modal { transform: translateY(0) scale(1); }
.modal-close {
  position: sticky; top: 0; float: right;
  margin: 14px 14px 0 0; background: var(--surface-2);
  border: 1px solid var(--border); width: 30px; height: 30px; border-radius: 50%;
  cursor: pointer; color: var(--text-3);
  display: flex; align-items: center; justify-content: center; z-index: 1;
  transition: color .18s, background .18s, border-color .18s;
}
.modal-close:hover { background: var(--bg-2); color: var(--text-1); }
.modal-close svg { width: 14px; height: 14px; }
.modal-body { padding: 18px 22px 32px; clear: both; }

/* ═══════════════════════════════════════════════════════════
   PRACTICE VIEW
   ═══════════════════════════════════════════════════════════ */
#practiceView { background: var(--bg); transition: background .35s; }
.practice-wrap { max-width: 640px; margin: 0 auto; padding: 44px 20px 64px; }
.practice-head { margin-bottom: 28px; }

.quiz-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 18px; }
.meta-chip {
  padding: 5px 14px; border-radius: 20px; font-size: .8rem;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text-2); box-shadow: var(--sh-1);
  transition: background .35s, border-color .35s;
}
.meta-chip strong { color: var(--text-1); font-weight: 600; }

.quiz-cats { display: flex; flex-wrap: wrap; gap: 6px; }
.qcat {
  padding: 5px 13px; border-radius: 20px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text-2); font-size: .78rem; cursor: pointer;
  box-shadow: var(--sh-1);
  transition: color .18s, background .18s, border-color .18s, box-shadow .18s;
}
.qcat:hover { border-color: var(--text-3); color: var(--text-1); box-shadow: var(--sh-2); }
.qcat.active {
  background: var(--text-1); border-color: var(--text-1);
  color: var(--bg); font-weight: 500; box-shadow: var(--sh-2);
}

.quiz-card {
  background: var(--surface); border-radius: var(--radius-xl);
  padding: 30px 28px 24px; box-shadow: var(--sh-3);
  border: 1px solid var(--border-s);
  transition: background .35s, border-color .35s, box-shadow .35s;
}
.quiz-type {
  font-family: var(--f-mono); font-size: .65rem; font-weight: 600;
  letter-spacing: .15em; text-transform: uppercase;
  color: var(--text-3); margin-bottom: 10px;
}
.quiz-q {
  font-family: var(--f-serif); font-size: 1.35rem; font-weight: 600;
  color: var(--text-1); margin-bottom: 22px; line-height: 1.35;
  letter-spacing: -.01em;
}
.quiz-opts { display: flex; flex-direction: column; gap: 9px; margin-bottom: 18px; }
.quiz-opt {
  padding: 13px 18px; border-radius: var(--radius);
  border: 1.5px solid var(--border); background: var(--surface-2);
  color: var(--text-1); font-size: .9rem; text-align: left; cursor: pointer;
  transition: border-color .15s, background .15s, transform .2s var(--ease-spring), box-shadow .18s;
}
.quiz-opt:hover:not(:disabled) {
  border-color: var(--text-3); background: var(--bg-2);
  transform: translateX(4px); box-shadow: var(--sh-1);
}
.quiz-opt.correct {
  border-color: #4eab7a; background: #eefdf6; color: #2a7a50; font-weight: 600;
}
.quiz-opt.wrong {
  border-color: #c97570; background: #fef2f1; color: #884040;
}
[data-theme="dark"] .quiz-opt.correct { background: rgba(78,171,122,.12); color: #7ad4a0; }
[data-theme="dark"] .quiz-opt.wrong   { background: rgba(201,117,112,.12); color: #d49090; }
.quiz-opt:disabled { cursor: default; }

.quiz-fb {
  font-size: .86rem; min-height: 22px; margin-bottom: 14px;
  font-weight: 500; color: var(--text-3);
}
.quiz-fb.correct { color: #4eab7a; }
.quiz-fb.wrong   { color: #c97570; }

/* ── Shared Typography Utils ─────────────────────────────── */
.section-kicker {
  display: block; font-family: var(--f-mono); font-size: .68rem; font-weight: 400;
  letter-spacing: .15em; text-transform: uppercase;
  color: var(--text-3); margin-bottom: 8px;
}
.section-title {
  font-family: var(--f-serif); font-size: 1.6rem; font-weight: 600;
  letter-spacing: -.015em; color: var(--text-1); margin-bottom: 8px;
}

/* Primary button */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: var(--radius);
  border: none; background: var(--text-1); color: var(--bg);
  font-family: var(--f-sans); font-size: .88rem; font-weight: 500;
  cursor: pointer;
  box-shadow: var(--sh-2);
  transition: background .18s, box-shadow .18s, transform .2s var(--ease-spring);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: var(--sh-3);
}

/* ── Audio pronunciation button ──────────────────────────── */
.d-en-row { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.d-en-row .d-en { margin-bottom: 0; }
.audio-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; flex-shrink: 0; padding: 0;
  border-radius: 50%; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text-2); cursor: pointer;
  vertical-align: middle;
  transition: background .18s, border-color .18s, color .18s, transform .2s var(--ease-spring);
}
.audio-btn svg { width: 16px; height: 16px; }
.audio-btn:hover {
  color: #fff; border-color: transparent; transform: scale(1.08);
  background: linear-gradient(135deg, #c97570, #9278cc);
}
.audio-btn:active { transform: scale(.96); }
.quiz-q .audio-btn { width: 28px; height: 28px; margin-left: 8px; }
.quiz-fb .audio-btn { width: 24px; height: 24px; }
.quiz-fb .audio-btn svg { width: 13px; height: 13px; }

/* ── Hero actions row ────────────────────────────────────── */
.hero-actions {
  display: inline-flex; gap: 10px; flex-wrap: wrap; justify-content: center;
}

/* ── Share button in quiz meta ───────────────────────────── */
.meta-share {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px; border-radius: 20px; font-size: .8rem;
  border: 1px solid transparent; cursor: pointer;
  color: #fff; font-family: var(--f-sans); font-weight: 500;
  background: linear-gradient(135deg, #c97570, #9278cc);
  box-shadow: var(--sh-1);
  transition: transform .2s var(--ease-spring), box-shadow .18s, filter .18s;
}
.meta-share svg { width: 14px; height: 14px; }
.meta-share:hover { transform: translateY(-1px); box-shadow: var(--sh-2); filter: brightness(1.08); }

/* ── Toast ───────────────────────────────────────────────── */
.mt-toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 16px);
  z-index: 1000; max-width: 90vw;
  padding: 12px 20px; border-radius: var(--radius);
  background: var(--text-1); color: var(--bg);
  font-size: .85rem; font-weight: 500; box-shadow: var(--sh-4);
  opacity: 0; pointer-events: none;
  transition: opacity .25s, transform .25s var(--ease-spring);
}
.mt-toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .topnav { padding: 0 14px; }
  .tab { padding: 0 10px; font-size: .8rem; }
  .brand-name { display: none; }
  .beta-badge { display: none; }
  .hero-inner { padding: 40px 20px; }
  .hero-stats { flex-direction: column; max-width: 320px; }
  .hstat-sep { width: 100%; height: 1px; align-self: auto; }
  .hstat { padding: 18px 16px; }

  .roots-layout { grid-template-columns: 1fr; height: auto; }
  .roots-sidebar { max-height: 38vh; }
  .roots-main { padding: 22px; }

  .topics-layout { grid-template-columns: 1fr; }
  .topics-sidebar { border-right: none; border-bottom: 1px solid var(--border-s); padding: 14px; }
  .category-list { flex-direction: row; flex-wrap: wrap; }
  .cat-btn { width: auto; padding: 6px 10px; }
  .cat-ico, .cat-count { display: none; }
  .topics-main { padding: 16px; }

  .term-drawer { width: 100vw; top: auto; height: 72vh; transform: translateY(100%); }
  .term-drawer.open { transform: translateY(0); }

  .practice-wrap { padding: 24px 14px 44px; }
  .quiz-card { padding: 22px 18px; }

  /* Graph bar — single line: hide scheme sub-labels, auto-width search, hide filter pills */
  .graph-bar { gap: 8px; padding: 8px 12px; flex-wrap: nowrap; }
  .sch-en { display: none; }
  #graphSearch { width: auto; flex: 1; min-width: 0; }
  .graph-filter { display: none; }

  /* Hero orbs — scale down to prevent overflow bleed */
  .hero-orb-1 { width: 280px; height: 280px; top: -60px; right: -40px; }
  .hero-orb-2 { width: 240px; height: 240px; bottom: -50px; left: -30px; }
  .hero-orb-3 { width: 160px; height: 160px; }

  /* Term drawer — drag handle affordance */
  .term-drawer::before {
    content: '';
    display: block; width: 36px; height: 4px;
    background: var(--border); border-radius: 2px;
    margin: 12px auto 4px;
  }
  [data-theme="dark"] .term-drawer::before { background: rgba(255,255,255,.12); }
}

/* ── Small phones: bottom navigation ────────────────────── */
@media (max-width: 640px) {
  :root {
    --nav-h: 52px;
    --bottom-nav-h: 56px;
  }

  /* Nav tabs → fixed bottom bar */
  .nav-tabs {
    position: fixed;
    bottom: 0; left: 0; right: 0; top: auto;
    height: var(--bottom-nav-h);
    background: var(--surface);
    border-top: 1px solid var(--border-s);
    border-bottom: none;
    justify-content: space-around;
    z-index: 201;
    box-shadow: 0 -2px 10px rgba(26,22,16,.07), 0 -1px 2px rgba(26,22,16,.04);
    gap: 0;
    transition: background .35s, border-color .35s, box-shadow .35s;
  }
  [data-theme="dark"] .nav-tabs {
    box-shadow: 0 -2px 10px rgba(0,0,0,.35), 0 -1px 2px rgba(0,0,0,.25);
  }

  .tab {
    flex: 1; flex-direction: column; gap: 3px;
    padding: 6px 4px 8px;
    font-size: .6rem; height: 100%;
    align-items: center; justify-content: center;
  }

  /* Active indicator moves to top edge in bottom nav */
  .tab::after {
    bottom: auto; top: 0;
    left: 22%; right: 22%;
    border-radius: 0 0 2px 2px;
  }

  /* Graph area — subtract bottom nav from height */
  .graph-area {
    height: calc(100vh - var(--nav-h) - var(--bottom-nav-h));
  }

  /* Scrollable views — clear bottom nav */
  #rootsView, #topicsView, #practiceView {
    padding-bottom: var(--bottom-nav-h);
  }
  .hero { padding-bottom: var(--bottom-nav-h); }

  /* Term drawer — anchor above bottom nav */
  .term-drawer { bottom: var(--bottom-nav-h); }
}