/* DSM-5-TR Study Companion
   Palette: maroon chrome and dark orange accents, matching the app icon. Each mode color always
   means the same study mode (rose = guide, gold = high yield, orange = criteria,
   violet = differential, teal = specifiers and course, red = board questions). */

:root {
  --night: #6E1A27;
  --night-deep: #4A0F19;
  --night-ink: #FBEDE8;
  --night-ink-2: #F0C9C2;
  --leaf-ink: #A4472F;

  --paper: #FBF6F2;
  --surface: #FFFFFF;
  --tint: #F7EAE4;
  --side: #F7EEE9;
  --ink: #2A1416;
  --ink-2: #5A3C3E;
  --ink-3: #75585A;
  --rule: #EAD9D2;

  --accent: #B04A14;
  --accent-ink: #FFFFFF;

  --m-guide: #B03A5B;
  --m-hy: #956000;
  --m-mech: #B04A14;
  --m-drug: #6E46AE;
  --m-clin: #2C766A;
  --m-case: #BF3A2B;
  --m-gloss: #8A5A3C;
  --m-upd: #956000;
  --m-dx: var(--m-hy); --m-pharm: var(--m-drug); --m-found: var(--m-mech);

  --good: #2E7D4F;
  --bad: #C8364B;
  --focus: #2B6CB0;
  --mark: #FFE3B8;
  --upd-bg: #FFF3DE;
  --hero-a: #F8E1DA;
  --hero-b: #FBE8D6;
  --hero-c: #FFF4E4;
  --petal-a: #FFF4EC;
  --petal-b: #F2C6BC;
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: 'Figtree', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --display: 'Fraunces', Georgia, serif;

  --wrap: 1180px;
  --measure: 70ch;
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 18px;
  --top: 64px;
  --side-w: 276px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --night: #1E0D10;
  --night-deep: #140709;
  --night-ink: #F7ECE8;
  --night-ink-2: #D9C2BC;
  --leaf-ink: #C0603A;
  --paper: #160B0D;
  --surface: #221214;
  --tint: #2D171A;
  --side: #1A0C0F;
  --ink: #F5EAE6;
  --ink-2: #D6BFB9;
  --ink-3: #AE918B;
  --rule: #3D2226;
  --accent: #EE8A3C;
  --accent-ink: #2A1406;
  --m-guide: #E88A9E;
  --m-hy: #E8B65A;
  --m-mech: #F08F4E;
  --m-drug: #B8A1E3;
  --m-clin: #7CC3B6;
  --m-case: #F27C6C;
  --m-gloss: #D9A88A;
  --m-upd: #F2C14E;
  --good: #6FD39A;
  --bad: #FF7F8E;
  --focus: #8EC2FF;
  --mark: #5A3A14;
  --upd-bg: #2A1E10;
  --hero-a: #2E1216;
  --hero-b: #2A160E;
  --hero-c: #1F1210;
  --petal-a: #D9C7C0;
  --petal-b: #B98790;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
  --night: #1E0D10;
  --night-deep: #140709;
  --night-ink: #F7ECE8;
  --night-ink-2: #D9C2BC;
  --leaf-ink: #C0603A;
  --paper: #160B0D;
  --surface: #221214;
  --tint: #2D171A;
  --side: #1A0C0F;
  --ink: #F5EAE6;
  --ink-2: #D6BFB9;
  --ink-3: #AE918B;
  --rule: #3D2226;
  --accent: #EE8A3C;
  --accent-ink: #2A1406;
  --m-guide: #E88A9E;
  --m-hy: #E8B65A;
  --m-mech: #F08F4E;
  --m-drug: #B8A1E3;
  --m-clin: #7CC3B6;
  --m-case: #F27C6C;
  --m-gloss: #D9A88A;
  --m-upd: #F2C14E;
  --good: #6FD39A;
  --bad: #FF7F8E;
  --focus: #8EC2FF;
  --mark: #5A3A14;
  --upd-bg: #2A1E10;
  --hero-a: #2E1216;
  --hero-b: #2A160E;
  --hero-c: #1F1210;
  --petal-a: #D9C7C0;
  --petal-b: #B98790;
  color-scheme: dark;
  }
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--top) + 16px); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.55 var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; outline: none; }
img, svg { max-width: 100%; }
a { color: inherit; }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 clamp(16px, 4vw, 32px); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 50; background: var(--surface); padding: 8px 14px; border-radius: var(--r-sm); }
.skip:focus { left: 8px; }
mark { background: var(--mark); color: inherit; border-radius: 2px; padding: 0 1px; }
.loading { padding: 80px 0; color: var(--ink-3); }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: var(--night);
  color: var(--night-ink);
  padding-top: env(safe-area-inset-top, 0px);
  box-shadow: 0 1px 0 rgba(255,255,255,.06);
}
.topbar__inner {
  max-width: var(--wrap); margin: 0 auto; min-height: 64px;
  padding: 11px clamp(12px, 3vw, 32px);
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.brand img { border-radius: 9px; display: block; }
.brand__name { font-weight: 700; letter-spacing: -0.01em; line-height: 1.1; font-size: 1.02rem; }
.brand__sub { display: block; font-weight: 500; color: var(--night-ink-2); font-size: .82rem; letter-spacing: 0; }

.search { position: relative; margin-left: auto; flex: 1 1 260px; max-width: 440px; }
.search__icon { position: absolute; left: 12px; top: 50%; width: 18px; height: 18px; transform: translateY(-50%); color: var(--night-ink-2); pointer-events: none; }
.search input {
  width: 100%; height: 42px; border-radius: 21px;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.08);
  color: var(--night-ink);
  padding: 0 40px 0 38px;
  -webkit-appearance: none; appearance: none;
}
.search input::placeholder { color: var(--night-ink-2); }
.search input:focus { background: rgba(255,255,255,.14); outline: none; border-color: rgba(255,255,255,.45); }
.search input::-webkit-search-cancel-button { display: none; }
.search__kbd {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  font: 600 .75rem/1 var(--sans); color: var(--night-ink-2);
  border: 1px solid rgba(255,255,255,.25); border-radius: 5px; padding: 3px 6px;
}
.search input:focus ~ .search__kbd { display: none; }

.suggest {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--rule); border-radius: var(--r-md);
  box-shadow: 0 18px 48px rgba(10, 12, 40, .28);
  max-height: min(70vh, 520px); overflow: auto; padding: 6px;
}
.suggest__item {
  display: block; padding: 10px 12px; border-radius: 8px; text-decoration: none; cursor: pointer;
}
.suggest__item[aria-selected="true"], .suggest__item:hover { background: var(--tint); }
.suggest__meta { display: flex; gap: 8px; align-items: center; font-size: .78rem; color: var(--ink-3); margin-bottom: 2px; }
.suggest__text { font-size: .9rem; color: var(--ink-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.suggest__all { font-weight: 600; color: var(--m-pharm); }
.suggest__empty { padding: 14px 12px; color: var(--ink-3); font-size: .92rem; }

.histnav { display: flex; gap: 4px; flex-shrink: 0; }
.hist-btn {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0; padding: 0;
  border: 1px solid rgba(255,255,255,.16); background: transparent; color: var(--night-ink); cursor: pointer;
  display: grid; place-items: center;
}
.hist-btn svg { width: 18px; height: 18px; }
.hist-btn:hover:not(:disabled) { background: rgba(255,255,255,.1); }
.hist-btn:disabled { opacity: .32; cursor: default; }
.hist-btn:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.theme-btn {
  width: 42px; height: 42px; border-radius: 50%; flex-shrink: 0;
  border: 1px solid rgba(255,255,255,.16); background: transparent; color: var(--night-ink); cursor: pointer;
  display: grid; place-items: center;
}
.theme-btn svg { width: 20px; height: 20px; }
.theme-btn:hover { background: rgba(255,255,255,.1); }

/* ---------- mode pills (used in search, cards) ---------- */
.kind {
  display: inline-flex; align-items: center; gap: 6px;
  font: 600 .78rem/1 var(--sans); color: var(--ink-2);
}
.kind::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--c, var(--ink-3)); }
.c-guide { --c: var(--m-guide); }
.c-hy { --c: var(--m-hy); }
.c-dx { --c: var(--m-dx); }
.c-case { --c: var(--m-case); }
.c-pharm { --c: var(--m-pharm); }
.c-found { --c: var(--m-found); }
.c-gloss { --c: var(--m-gloss); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 18px; border-radius: 22px;
  font: 600 .95rem/1 var(--sans); text-decoration: none; cursor: pointer;
  border: 1px solid var(--rule); background: var(--surface); color: var(--ink);
}
.btn:hover { border-color: var(--ink-3); }
.btn--solid { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn--solid:hover { opacity: .9; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

/* ---------- home ---------- */
.hero {
  background:
    radial-gradient(120% 140% at 18% 0%, #8B2232 0%, var(--night) 45%, var(--night-deep) 100%);
  color: var(--night-ink);
  overflow: hidden;
}
.hero__grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: clamp(24px, 4vw, 56px);
  align-items: center; padding-top: clamp(40px, 7vw, 88px); padding-bottom: clamp(40px, 7vw, 88px);
}
.hero h1 {
  font: 700 clamp(2.1rem, 4.4vw, 3.5rem)/1.04 var(--sans); letter-spacing: -0.03em; margin: 0 0 18px;
  max-width: 14ch;
}
.hero__lede { font: 400 1.12rem/1.6 var(--serif); color: var(--night-ink-2); max-width: 46ch; margin: 0 0 26px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 10px; }
.hero .btn { background: transparent; color: var(--night-ink); border-color: rgba(255,255,255,.3); }
.hero .btn:hover { border-color: rgba(255,255,255,.7); }
.hero .btn--solid { background: var(--night-ink); color: var(--night-deep); border-color: var(--night-ink); }

.refract { display: grid; grid-template-columns: 112px minmax(40px, 1fr) minmax(220px, 1.5fr); align-items: stretch; }
.refract__prism { align-self: center; width: 112px; height: auto; overflow: visible; }
.refract__raybox { position: relative; min-height: 100%; }
.refract__rays { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.refract__for { grid-column: 1 / -1; font: 500 .9rem/1.3 var(--sans); color: var(--night-ink-2); margin: 0 0 12px; }
.refract__for a { color: var(--night-ink); }
.spectrum { list-style: none; margin: 0; padding: 0; display: grid; grid-auto-rows: 1fr; }
.spectrum a {
  display: block; height: 100%; text-decoration: none;
  padding: 9px 0 9px 16px; border-left: 4px solid var(--c);
}
.spectrum a:hover .spectrum__label, .spectrum a:focus-visible .spectrum__label { text-decoration: underline; text-underline-offset: 3px; }
.spectrum__label { display: block; font: 700 1.02rem/1.2 var(--sans); color: #fff; }
.spectrum__blurb { display: block; font-size: .86rem; color: var(--night-ink-2); line-height: 1.35; }

.home-section { padding-top: 48px; padding-bottom: 24px; }
.home-section h2 { font: 700 1.5rem/1.2 var(--sans); letter-spacing: -0.015em; margin: 0 0 18px; }
.chapter-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.chapter-row {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 22px; align-items: center;
  background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-lg);
  padding: 22px 26px; text-decoration: none;
}
.chapter-row:hover { border-color: var(--ink-3); }
.chapter-row__num {
  font: 800 3.6rem/0.9 var(--sans); letter-spacing: -0.04em;
  color: transparent; -webkit-text-stroke: 2px var(--ink);
  min-width: 1.4ch; text-align: center;
}
.chapter-row h3 { font: 700 1.2rem/1.25 var(--sans); margin: 0 0 6px; letter-spacing: -0.01em; }
.chapter-row p { margin: 0; color: var(--ink-2); font-size: .95rem; max-width: 70ch; }
.chapter-row__stats { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 10px; font-size: .85rem; color: var(--ink-3); }
.chapter-row__stats b { color: var(--ink); font-weight: 700; }
.meter { width: 150px; }
.meter__label { font-size: .8rem; color: var(--ink-3); margin-bottom: 6px; text-align: right; }
.meter__bar { height: 6px; border-radius: 3px; background: var(--tint); overflow: hidden; }
.meter__bar span { display: block; height: 100%; background: linear-gradient(90deg, var(--m-guide), var(--m-hy), var(--m-dx), var(--m-case), var(--m-pharm), var(--m-found)); }

.howto { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; padding-bottom: 56px; }
.howto h3 { font: 700 1rem/1.3 var(--sans); margin: 0 0 6px; }
.howto p { margin: 0; color: var(--ink-2); font-size: .95rem; }

/* ---------- chapter header + modes ---------- */
.ch-head { background: var(--surface); border-bottom: 1px solid var(--rule); }
.ch-head__inner { padding-top: 26px; padding-bottom: 18px; }
.crumb { margin: 0 0 14px; font-size: .88rem; }
.crumb a { color: var(--ink-3); text-decoration: none; }
.crumb a:hover { color: var(--ink); text-decoration: underline; }
.ch-head__title { display: flex; align-items: center; gap: 20px; }
.ch-num {
  font: 800 clamp(3.4rem, 7vw, 5rem)/.85 var(--sans); letter-spacing: -0.05em;
  color: transparent; -webkit-text-stroke: 2px var(--ink);
}
.ch-head h1 { font: 700 clamp(1.45rem, 2.8vw, 2.1rem)/1.12 var(--sans); letter-spacing: -0.02em; margin: 0; max-width: 26ch; }
.modes {
  position: relative;
  display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none;
  padding-top: 6px;
}
.modes::-webkit-scrollbar { display: none; }
.mode {
  flex: 1 0 auto; text-decoration: none; padding: 12px 14px 10px;
  font: 600 .93rem/1 var(--sans); color: var(--ink-2); white-space: nowrap;
  border-bottom: 4px solid color-mix(in srgb, var(--c) 30%, transparent);
  display: flex; align-items: center; gap: 8px; justify-content: center;
}
.mode:hover { color: var(--ink); border-bottom-color: color-mix(in srgb, var(--c) 65%, transparent); }
.mode.is-active { color: var(--ink); border-bottom-width: 6px; border-bottom-color: var(--c); padding-bottom: 8px; }
.mode__count { font-size: .75rem; font-weight: 700; color: var(--ink-3); background: var(--tint); border-radius: 10px; padding: 3px 7px; }

/* ---------- study guide ---------- */
.guide { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 48px; padding-top: 36px; padding-bottom: 72px; }
.toc { position: sticky; top: calc(var(--top) + 20px); align-self: start; max-height: calc(100vh - var(--top) - 40px); overflow: auto; padding-right: 6px; font-size: .9rem; }
.toc ol { list-style: none; margin: 0 0 18px; padding: 0; }
.toc__part { font: 700 .82rem/1.3 var(--sans); color: var(--ink-3); margin: 0 0 6px; padding-left: 12px; }
.toc a {
  display: grid; grid-template-columns: 3.1em 1fr; gap: 4px; padding: 6px 10px 6px 12px; border-radius: 6px;
  text-decoration: none; color: var(--ink-2); line-height: 1.3; border-left: 3px solid transparent;
}
.toc a:hover { background: var(--tint); color: var(--ink); }
.toc a.is-current { color: var(--ink); background: var(--tint); border-left-color: var(--m-guide); font-weight: 600; }
.toc__n { color: var(--ink-3); font-variant-numeric: tabular-nums; }
.toc-mobile { display: none; }

.reading { min-width: 0; }
.reading__intro { font: 400 1.2rem/1.6 var(--serif); color: var(--ink-2); max-width: var(--measure); margin: 0 0 12px; }
.objectives { max-width: var(--measure); background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 18px 22px; margin: 22px 0 8px; }
.objectives h2 { font: 700 1rem/1.3 var(--sans); margin: 0 0 8px; }
.objectives ul { margin: 0; padding-left: 1.2em; font: 400 1rem/1.55 var(--serif); }

.g-part { margin: 56px 0 0; padding-top: 18px; border-top: 2px solid var(--ink); max-width: var(--measure); }
.g-part p { margin: 0; font: 700 .95rem/1.3 var(--sans); color: var(--ink-3); }
.g-part h2 { font: 800 1.9rem/1.1 var(--sans); letter-spacing: -0.025em; margin: 4px 0 0; }
.g-sec { padding-top: 34px; }
.g-sec h3 { font: 700 1.4rem/1.2 var(--sans); letter-spacing: -0.015em; margin: 0 0 12px; max-width: var(--measure); display: flex; gap: 12px; align-items: baseline; }
.g-n { color: var(--m-guide); font-variant-numeric: tabular-nums; font-size: 1rem; font-weight: 700; flex-shrink: 0; }
.g-block { max-width: var(--measure); scroll-margin-top: calc(var(--top) + 24px); border-radius: 8px; transition: background-color .8s ease, box-shadow .8s ease; }
.g-block.is-flash { background: color-mix(in srgb, var(--mark) 60%, transparent); box-shadow: 0 0 0 8px color-mix(in srgb, var(--mark) 60%, transparent); }
.g-sec p, .g-sec li, .g-sec dd { font: 400 1.06rem/1.7 var(--serif); }
.g-sec p { margin: 0 0 14px; }
.g-sec h4 { font: 700 1.02rem/1.3 var(--sans); margin: 22px 0 8px; }
.g-sec ul, .g-sec ol { margin: 0 0 16px; padding-left: 1.3em; }
.g-sec li { margin-bottom: 6px; }
.g-sec li::marker { color: var(--ink-3); }
.g-sec strong { font-weight: 600; }
.cols { columns: 2 220px; column-gap: 32px; }
.cols li { break-inside: avoid; }

dl.defs { margin: 0 0 18px; display: grid; grid-template-columns: minmax(130px, max-content) 1fr; gap: 8px 18px; }
dl.defs dt { font: 700 .95rem/1.5 var(--sans); padding-top: 2px; }
dl.defs dd { margin: 0; }

.callout {
  border-left: 4px solid var(--c); background: var(--surface);
  border-radius: 0 var(--r-md) var(--r-md) 0; padding: 14px 18px; margin: 4px 0 18px;
}
.g-sec .callout__title { font: 700 .9rem/1.3 var(--sans); color: var(--c); margin: 0 0 4px; }
.callout p:last-child { margin-bottom: 0; }
.callout--pearl { --c: var(--m-case); }
.callout--exam { --c: var(--m-hy); }
.callout--caution { --c: var(--m-guide); }

.case { margin: 6px 0 20px; background: var(--tint); border-radius: var(--r-md); padding: 18px 20px; }
.case figcaption { font: 700 .95rem/1.3 var(--sans); margin-bottom: 6px; }
.g-sec .case p { font-size: 1rem; }
.g-sec .case__point { margin: 0; font: 500 .95rem/1.5 var(--sans); color: var(--ink-2); }
.case__point b { color: var(--ink); }

.table-wrap { overflow-x: auto; margin: 6px 0 20px; border: 1px solid var(--rule); border-radius: var(--r-md); background: var(--surface); max-width: 100%; }
.g-block.is-wide { max-width: none; }
table { border-collapse: collapse; width: 100%; font: 400 .92rem/1.45 var(--sans); }
caption { text-align: left; font: 700 .95rem/1.3 var(--sans); padding: 12px 14px 4px; }
th, td { text-align: left; vertical-align: top; padding: 9px 14px; border-top: 1px solid var(--rule); }
thead th { background: var(--tint); font-weight: 700; border-top: none; white-space: nowrap; }
tbody th { font-weight: 700; }
.g-sec .table-note { font-size: .82rem; color: var(--ink-3); padding: 8px 14px 12px; margin: 0; border-top: 1px solid var(--rule); }
.table-group td { background: var(--tint); font-weight: 700; }

.g-block.timeline { max-width: 820px; }
.timeline { margin: 6px 0 22px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 16px 18px 12px; }
.g-sec .timeline__title { font: 700 .95rem/1.3 var(--sans); margin: 0 0 12px; }
.timeline__grid { display: grid; grid-template-columns: minmax(110px, 170px) 0.6fr repeat(3, minmax(0, 1fr)); row-gap: 10px; align-items: center; font-family: var(--sans); }
.timeline__head { font-size: .78rem; color: var(--ink-3); border-left: 1px dashed var(--rule); padding-left: 6px; }
.timeline__label { grid-column: 1; font-weight: 600; font-size: .9rem; padding-right: 10px; }
.timeline__bar { min-height: 28px; border-radius: 14px; background: var(--c); color: #fff; font-size: .78rem; line-height: 1.2; font-weight: 700; display: flex; align-items: center; padding: 5px 10px; }
.g-sec .timeline__note { grid-column: 2 / -1; font-size: .82rem; color: var(--ink-3); margin-top: -4px; }
[data-theme="dark"] .timeline__bar { color: #10132E; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .timeline__bar { color: #10132E; } }

.steps { list-style: none; padding: 0 !important; counter-reset: s; margin: 6px 0 20px; }
.steps li { counter-increment: s; position: relative; padding: 0 0 16px 46px; margin: 0; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 0; width: 30px; height: 30px; border-radius: 50%;
  background: var(--ink); color: var(--paper); font: 700 .9rem/30px var(--sans); text-align: center;
}
.steps li:not(:last-child)::after { content: ""; position: absolute; left: 14px; top: 34px; bottom: 4px; width: 2px; background: var(--rule); }
.steps b { display: block; font: 700 1rem/1.4 var(--sans); margin-bottom: 2px; }

/* ---------- high yield ---------- */
.hy-page { padding-top: 32px; padding-bottom: 72px; }
.hy-tools {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 22px;
  background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 14px 18px; margin-bottom: 26px;
}
.hy-tools p { margin: 0; color: var(--ink-2); font-size: .93rem; }
.switch { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; cursor: pointer; }
.switch input { width: 40px; height: 22px; appearance: none; -webkit-appearance: none; background: var(--rule); border-radius: 11px; position: relative; cursor: pointer; transition: background .2s; margin: 0; }
.switch input::after { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: #fff; transition: transform .2s; }
.switch input:checked { background: var(--m-hy); }
.switch input:checked::after { transform: translateX(18px); }
.hy-grid { columns: 2 420px; column-gap: 28px; }
.hy-topic { break-inside: avoid; background: var(--surface); border: 1px solid var(--rule); border-top: 4px solid var(--m-hy); border-radius: var(--r-md); padding: 18px 22px 8px; margin: 0 0 22px; }
.hy-topic h2 { font: 700 1.12rem/1.25 var(--sans); margin: 0 0 10px; letter-spacing: -0.01em; }
.hy-topic ul { margin: 0; padding-left: 1.15em; }
.hy-topic li { font: 400 .99rem/1.6 var(--serif); margin-bottom: 9px; scroll-margin-top: calc(var(--top) + 24px); border-radius: 6px; transition: background-color .8s; }
.hy-topic li.is-flash { background: var(--mark); }
.hy-topic li::marker { color: var(--m-hy); }
.hy-topic strong { font-weight: 600; }
.quiz-on .hy-topic strong {
  color: transparent; background: var(--tint); border-radius: 4px; cursor: pointer;
  box-shadow: inset 0 -2px 0 var(--m-hy); transition: color .15s;
}
.quiz-on .hy-topic strong.is-revealed { color: var(--ink); background: color-mix(in srgb, var(--m-hy) 14%, transparent); }

/* ---------- flashcards ---------- */
.cards-page { padding-top: 28px; padding-bottom: 72px; }
.decks { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin-bottom: 20px; }
.deck {
  text-decoration: none; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md);
  padding: 12px 14px; border-top: 4px solid var(--c);
}
.deck:hover { border-color: var(--ink-3); border-top-color: var(--c); }
.deck.is-active { box-shadow: 0 0 0 2px var(--c); border-color: transparent; }
.deck__name { display: block; font: 700 .98rem/1.2 var(--sans); }
.deck__meta { display: block; font-size: .82rem; color: var(--ink-3); margin-top: 3px; }

.deck-bar { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.deck-bar__opts { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; }
.check { display: inline-flex; align-items: center; gap: 8px; font-size: .92rem; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--c, var(--ink)); }
.link-btn { background: none; border: none; color: var(--ink-3); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; font-size: .88rem; padding: 4px; }
.link-btn:hover { color: var(--ink); }

.tally { display: flex; align-items: center; gap: 14px; font-size: .88rem; color: var(--ink-3); margin-bottom: 10px; }
.tally__bar { flex: 1; height: 8px; border-radius: 4px; background: var(--tint); overflow: hidden; display: flex; }
.tally__known { background: var(--good); }
.tally__learn { background: var(--m-hy); }
.tally b { color: var(--ink); font-variant-numeric: tabular-nums; }

.stage { perspective: 1600px; }
.flashcard {
  display: grid; position: relative; min-height: 340px; cursor: pointer;
  transform-style: preserve-3d; transition: transform .5s cubic-bezier(.2,.7,.2,1);
  border-radius: var(--r-lg);
}
.flashcard.is-flipped { transform: rotateY(180deg); }
.face {
  grid-area: 1 / 1; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-lg);
  padding: clamp(20px, 4vw, 36px); display: flex; flex-direction: column;
  box-shadow: 0 1px 0 var(--rule), 0 14px 36px -18px rgba(20, 24, 66, .35);
  border-top: 6px solid var(--c);
}
.face--back { transform: rotateY(180deg); }
.face__top { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; font-size: .82rem; color: var(--ink-3); }
.face__tag { font-weight: 700; color: var(--c); }
.face__q { font: 400 clamp(1.12rem, 2.2vw, 1.38rem)/1.55 var(--serif); margin: 0; }
.face__a { font: 400 clamp(1.05rem, 2vw, 1.22rem)/1.6 var(--serif); margin: 0; }
.face__a strong, .face__q strong { font-weight: 600; }
.face__why { margin: 16px 0 0; padding-top: 14px; border-top: 1px solid var(--rule); font: 400 1rem/1.6 var(--serif); color: var(--ink-2); }
.face__hint { margin-top: auto; padding-top: 22px; font-size: .84rem; color: var(--ink-3); }
.choices { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 8px; }
.choice {
  width: 100%; text-align: left; display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: start;
  background: var(--paper); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 11px 14px; cursor: pointer;
  font: 400 1rem/1.45 var(--serif);
}
.choice:hover { border-color: var(--c); }
.choice__key { font: 700 .85rem/1.7 var(--sans); color: var(--ink-3); }
.face__recap { font: 400 .98rem/1.55 var(--serif); color: var(--ink-2); margin: 0; }
.choices--static .choice { cursor: default; }
.choices--static .choice:hover { border-color: var(--rule); }
.choice.is-correct, .choices--static .choice.is-correct:hover { border-color: var(--good); background: color-mix(in srgb, var(--good) 10%, var(--surface)); }
.choice.is-wrong, .choices--static .choice.is-wrong:hover { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 8%, var(--surface)); }
.choice__note { display: block; font: 700 .78rem/1.4 var(--sans); margin-top: 2px; }
.is-correct .choice__note { color: var(--good); }
.is-wrong .choice__note { color: var(--bad); }
.verdict { font: 700 1.05rem/1.3 var(--sans); margin: 0 0 10px; }
.verdict.is-right { color: var(--good); }
.verdict.is-wrong { color: var(--bad); }
.answer-line { font: 600 1.05rem/1.5 var(--sans); margin: 0 0 4px; }

.card-nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.card-nav__pos { font-size: .9rem; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.rate { display: flex; gap: 10px; }
.btn--learn { border-color: var(--m-hy); }
.btn--known { background: var(--good); border-color: var(--good); color: #fff; }
[data-theme="dark"] .btn--known { color: #0E2A1C; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn--known { color: #0E2A1C; } }
.kbd-help { margin-top: 18px; font-size: .82rem; color: var(--ink-3); }
.kbd-help kbd { font: 600 .75rem/1 var(--sans); border: 1px solid var(--rule); border-radius: 4px; padding: 2px 6px; background: var(--surface); }
.empty { background: var(--surface); border: 1px dashed var(--rule); border-radius: var(--r-lg); padding: 40px 28px; text-align: center; }
.empty h2 { font: 700 1.2rem/1.3 var(--sans); margin: 0 0 8px; }
.empty p { color: var(--ink-2); margin: 0 auto 18px; max-width: 46ch; }

/* ---------- search page ---------- */
.search-page { padding-top: 36px; padding-bottom: 72px; max-width: 860px; }
.search-page h1 { font: 700 1.7rem/1.2 var(--sans); letter-spacing: -0.02em; margin: 0 0 6px; }
.search-page__sub { color: var(--ink-3); margin: 0 0 18px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.filter { border: 1px solid var(--rule); background: var(--surface); border-radius: 18px; padding: 7px 14px; cursor: pointer; font: 600 .88rem/1 var(--sans); color: var(--ink-2); }
.filter[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.results { list-style: none; margin: 0; padding: 0; }
.result { border-top: 1px solid var(--rule); }
.result a { display: block; padding: 16px 4px; text-decoration: none; }
.result a:hover .result__title { text-decoration: underline; text-underline-offset: 3px; }
.result__meta { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; font-size: .8rem; color: var(--ink-3); margin-bottom: 4px; }
.result__title { font: 700 1.04rem/1.3 var(--sans); margin: 0 0 4px; }
.result__text { margin: 0; color: var(--ink-2); font: 400 .98rem/1.55 var(--serif); }

/* ---------- footer ---------- */
.site-foot { background: var(--night-deep); color: var(--night-ink-2); margin-top: auto; padding-bottom: env(safe-area-inset-bottom, 0px); }
.site-foot__inner { padding-top: 26px; padding-bottom: 28px; }
.attribution { margin: 0 0 6px; color: var(--night-ink); font-weight: 600; }
.attribution a { color: var(--night-ink); text-underline-offset: 3px; }
.disclaimer { margin: 0; font-size: .84rem; max-width: 90ch; }
.backup { margin: 4px 0 22px; padding: 18px 20px; border: 1px solid color-mix(in srgb, var(--night-ink-2) 30%, transparent); border-radius: 14px; background: color-mix(in srgb, var(--night-ink) 5%, transparent); max-width: 760px; }
.backup__head { display: flex; gap: 14px; align-items: flex-start; }
.backup__icon { flex: none; width: 26px; height: 26px; color: var(--night-ink); margin-top: 2px; }
.backup__title { margin: 0 0 4px; font: 700 1.02rem/1.3 var(--sans); color: var(--night-ink); }
.backup__text { margin: 0; font-size: .9rem; line-height: 1.5; }
.backup__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 12px; margin: 14px 0 0 40px; }
.backup .backup__btn { background: transparent; color: var(--night-ink); border-color: color-mix(in srgb, var(--night-ink-2) 55%, transparent); }
.backup .backup__btn:hover { border-color: var(--night-ink); background: color-mix(in srgb, var(--night-ink) 8%, transparent); }
.backup #bk-export { background: var(--night-ink); color: var(--night-deep); border-color: var(--night-ink); }
.backup #bk-export:hover { opacity: .92; }
#bk-file:focus-visible + #bk-import-label { outline: 3px solid var(--focus); outline-offset: 2px; }
.backup .backup__undo { color: var(--night-ink-2); }
.backup .backup__undo:hover { color: var(--night-ink); }
.backup__meta { margin: 10px 0 0 40px; font-size: .82rem; }
.backup__status { margin: 6px 0 0 40px; font-size: .88rem; font-weight: 600; color: var(--night-ink); min-height: 0; }
.backup__status:empty { display: none; }
.backup__status.is-error { color: #FFB4A8; }
@media (max-width: 560px) {
  .backup { padding: 16px; }
  .backup__actions, .backup__meta, .backup__status { margin-left: 0; }
  .backup__actions .backup__btn { flex: 1 1 140px; }
}
@media print { .backup { display: none; } }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .guide { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 22px; }
  .toc { display: none; }
  .toc-mobile { display: block; position: sticky; top: var(--top); z-index: 10; background: var(--paper); padding: 10px 0; margin-bottom: 8px; }
  .toc-mobile details { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); }
  .toc-mobile summary { padding: 12px 16px; font-weight: 700; cursor: pointer; }
  .toc-mobile .toc { display: block; position: static; max-height: 55vh; padding: 0 8px 8px; }
  .decks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero__grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
  .search { order: 3; flex-basis: 100%; max-width: none; margin-left: 0; }
  .theme-btn { margin-left: auto; }
  .search__kbd { display: none; }
  .histnav { gap: 2px; }
  .hist-btn { width: 34px; height: 34px; }
  .brand img { width: 30px; height: 30px; }
  .refract { grid-template-columns: minmax(0, 1fr); }
  .refract__prism, .refract__raybox { display: none; }
  .chapter-row { grid-template-columns: auto minmax(0, 1fr); padding: 18px; gap: 16px; }
  .chapter-row .meter { grid-column: 1 / -1; width: 100%; }
  .meter__label { text-align: left; }
  .chapter-row__num { font-size: 2.6rem; }
  .howto { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .timeline__grid { grid-template-columns: 84px 0.5fr repeat(3, minmax(0, 1fr)); }
  .timeline__bar { font-size: .7rem; padding: 0 6px; }
  dl.defs { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  dl.defs dd { margin-bottom: 10px; }
  .flashcard { min-height: 300px; }
  .rate { width: 100%; }
  .rate .btn { flex: 1; }
}

/* ---------- site navigation ---------- */
.sitenav { display: flex; gap: 2px; align-items: center; order: 4; flex-basis: 100%; overflow-x: auto; scrollbar-width: none; margin: 0 -8px; padding: 0 2px; }
.sitenav::-webkit-scrollbar { display: none; }
.sitenav a {
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  padding: 8px 12px; border-radius: 18px; text-decoration: none;
  font: 600 .9rem/1 var(--sans); color: var(--night-ink-2);
}
.sitenav a:hover { color: var(--night-ink); background: rgba(255,255,255,.08); }
.sitenav a.is-active { color: var(--night-ink); background: rgba(255,255,255,.14); }
.badge { min-width: 20px; height: 20px; padding: 0 6px; border-radius: 10px; background: #F6A35C; color: #2A0B12; font: 700 .72rem/20px var(--sans); text-align: center; font-variant-numeric: tabular-nums; }
.badge--warn { background: #FF8A8F; }
.sitenav .nav-long { text-transform: none; }
@media (max-width: 720px) {
  .sitenav .nav-long { display: none; }
  .sitenav { gap: 0; }
  .sitenav a { padding: 8px 5px; font-size: .84rem; text-transform: capitalize; gap: 4px; letter-spacing: -0.005em; }
  .sitenav .badge { min-width: 18px; height: 18px; line-height: 18px; padding: 0 5px; font-size: .68rem; }
}
.badge[hidden] { display: none; }
@media (min-width: 1120px) {
  .sitenav { order: 0; flex-basis: auto; margin: 0 0 0 8px; overflow: visible; }
  .sitenav a { padding: 8px 10px; }
}

/* ---------- generic page ---------- */
.page { padding-top: 32px; padding-bottom: 72px; }
.page__head { margin-bottom: 22px; max-width: 76ch; }
.page__head h1 { font: 800 clamp(1.6rem, 3.4vw, 2.2rem)/1.15 var(--sans); letter-spacing: -0.02em; margin: 0 0 8px; }
.page__head p { color: var(--ink-2); margin: 0; }
.page__head .crumb { margin-bottom: 8px; }
.muted { color: var(--ink-3); font-weight: 400; }
.select { display: inline-flex; align-items: center; gap: 8px; font-size: .9rem; color: var(--ink-2); }
.select select {
  font: 600 .92rem/1 var(--sans); color: var(--ink); background: var(--surface);
  border: 1px solid var(--rule); border-radius: 18px; min-height: 38px; padding: 0 30px 0 14px; cursor: pointer;
  -webkit-appearance: none; appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-3) 50%), linear-gradient(135deg, var(--ink-3) 50%, transparent 50%);
  background-position: calc(100% - 16px) 50%, calc(100% - 11px) 50%; background-size: 5px 5px; background-repeat: no-repeat;
}
.deck-bar__count { font-size: .9rem; color: var(--ink-3); }
.empty__actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.btn.is-disabled { opacity: .45; pointer-events: none; }
.banner { background: color-mix(in srgb, var(--m-hy) 10%, var(--surface)); border: 1px solid color-mix(in srgb, var(--m-hy) 40%, var(--rule)); border-radius: var(--r-md); padding: 16px 18px; margin-bottom: 22px; display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: center; justify-content: space-between; }
.banner p { margin: 0; font-weight: 600; }
.banner .empty__actions { justify-content: flex-start; }

/* ---------- home: today panel ---------- */
.today { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 18px; }
.today__main { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-lg); padding: clamp(20px, 3vw, 30px); }
.today__main h2 { margin-top: 0; }
.today__big { font: 700 1.25rem/1.3 var(--sans); margin: 0 0 6px; }
.today__big span { font-size: 2.4rem; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.today__sub { color: var(--ink-2); margin: 0 0 16px; max-width: 52ch; }
.today__chapters { list-style: none; margin: 18px 0 0; padding: 14px 0 0; border-top: 1px solid var(--rule); display: flex; flex-wrap: wrap; gap: 8px; }
.today__chapters a { display: inline-flex; gap: 10px; padding: 7px 12px; border-radius: 16px; background: var(--tint); text-decoration: none; font-size: .88rem; font-weight: 600; }
.today__chapters a:hover { box-shadow: inset 0 0 0 1px var(--ink-3); }
.today__n { color: var(--ink-3); font-weight: 500; }
.tools { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.tool { display: flex; flex-direction: column; gap: 4px; padding: 16px 18px; border-radius: var(--r-md); background: var(--surface); border: 1px solid var(--rule); text-decoration: none; }
.tool:hover { border-color: var(--ink-3); }
.tool__name { font: 700 1rem/1.25 var(--sans); }
.tool__meta { font-size: .86rem; color: var(--ink-3); }
.tool__ch { font: 600 .78rem/1 var(--sans); color: var(--ink-3); margin-top: 6px; }
.meter__learn { background: var(--m-hy); }
.meter__bar { display: flex; }

/* ---------- card player additions ---------- */
.face__src { margin-left: auto; }
.face__status { font-weight: 600; }
.face__q--small { font-size: 1rem; color: var(--ink-2); margin-bottom: 12px; }
.card-nav__main { display: flex; justify-content: center; flex: 1; min-width: 0; }
.rate { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.rate__b { flex-direction: column; gap: 3px; min-width: 84px; min-height: 52px; padding: 6px 14px; border-radius: 14px; }
.rate__b small { font: 500 .74rem/1 var(--sans); color: var(--ink-3); }
.rate__b--1 { border-color: color-mix(in srgb, var(--bad) 55%, var(--rule)); }
.rate__b--2 { border-color: color-mix(in srgb, var(--m-hy) 55%, var(--rule)); }
.rate__b--3 { border-color: color-mix(in srgb, var(--good) 55%, var(--rule)); }
.rate__b--4 { border-color: color-mix(in srgb, var(--m-pharm) 55%, var(--rule)); }
.rate__b.is-suggested { box-shadow: 0 0 0 2px currentColor inset; }
.rate__b--1.is-suggested { color: var(--bad); } .rate__b--1.is-suggested small { color: inherit; }
.rate__b--3.is-suggested { color: var(--good); } .rate__b--3.is-suggested small { color: inherit; }
.cleared { margin: 0 14px 0 0; font-weight: 700; align-self: center; }
.cleared.is-right { color: var(--good); }
.cleared.is-wrong { color: var(--bad); }
.kbd-help { font-size: .82rem; color: var(--ink-3); margin-top: 16px; text-align: center; }
.kbd-help kbd { font: 600 .74rem/1 var(--sans); border: 1px solid var(--rule); border-bottom-width: 2px; border-radius: 4px; padding: 2px 5px; margin: 0 2px 0 8px; background: var(--surface); }

/* ---------- mistakes ---------- */
.mk-list { margin-top: 28px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); }
.mk-list summary { padding: 14px 18px; font-weight: 700; cursor: pointer; }
.mk-list ul { list-style: none; margin: 0; padding: 0 18px 8px; }
.mk { padding: 12px 0; border-top: 1px solid var(--rule); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 12px; }
.mk__meta { display: flex; gap: 14px; font-size: .82rem; color: var(--ink-3); grid-column: 1 / -1; }
.mk__q { margin: 0; font: 400 .95rem/1.5 var(--serif); }

/* ---------- exam ---------- */
.exam-form { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-lg); padding: clamp(18px, 3vw, 28px); max-width: 720px; }
.exam-form fieldset { border: 0; padding: 0; margin: 0 0 20px; display: grid; gap: 10px; }
.exam-form legend { font: 700 .82rem/1 var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin-bottom: 10px; padding: 0; }
.exam-form .check { font-size: .98rem; }
.seg { display: inline-flex; flex-wrap: wrap; gap: 8px; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg span { display: inline-flex; align-items: center; min-height: 40px; padding: 0 18px; border: 1px solid var(--rule); border-radius: 20px; font: 600 .92rem/1 var(--sans); background: var(--surface); }
.seg input:checked + span { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.seg input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.exam-form__sum { color: var(--ink-2); margin: 0 0 14px; }
.exam-hist { margin-top: 36px; max-width: 720px; }
.exam-hist table, .score-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.exam-hist th, .exam-hist td, .score-table th, .score-table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--rule); }
.exam-hist thead th, .score-table thead th { font: 700 .78rem/1.2 var(--sans); color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; background: var(--tint); }
.exam-hist tr:last-child td, .score-table tr:last-child th, .score-table tr:last-child td { border-bottom: 0; }
.score-table tbody th { font-weight: 600; }

.exam-bar { position: sticky; top: var(--top); z-index: 12; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; background: var(--paper); padding: 12px 0; margin-bottom: 8px; border-bottom: 1px solid var(--rule); }
.exam-bar__pos { font-weight: 700; }
.exam-bar__clock { margin-right: auto; font: 700 1rem/1 var(--sans); font-variant-numeric: tabular-nums; color: var(--ink-2); padding: 6px 10px; border-radius: 8px; background: var(--tint); }
.exam-bar__clock.is-low { color: #fff; background: var(--bad); }
.exam-bar .btn[aria-pressed="true"] { border-color: var(--m-hy); color: var(--m-hy); }
.exam-grid { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 24px; align-items: start; }
.exam-q { background: var(--surface); border: 1px solid var(--rule); border-top: 6px solid var(--m-case); border-radius: var(--r-lg); padding: clamp(20px, 3.5vw, 34px); }
.exam-q__meta { font-size: .82rem; color: var(--ink-3); margin: 0 0 12px; font-weight: 600; }
.exam-q__stem { font: 400 clamp(1.08rem, 2vw, 1.28rem)/1.6 var(--serif); margin: 0; }
.choice.is-picked { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); background: var(--tint); }
.choice.is-picked .choice__key { color: var(--ink); }
.exam-q .choice { --c: var(--m-case); }
.exam-nav { position: sticky; top: calc(var(--top) + 76px); background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 14px; }
.exam-nav__title { font: 700 .78rem/1 var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 0 0 10px; }
.exam-nav__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 6px; max-height: 50vh; overflow: auto; }
.qn { position: relative; height: 38px; border-radius: 8px; border: 1px solid var(--rule); background: var(--surface); color: var(--ink-2); font: 600 .86rem/1 var(--sans); cursor: pointer; font-variant-numeric: tabular-nums; }
.qn.is-answered { background: color-mix(in srgb, var(--m-case) 22%, var(--surface)); color: var(--ink); border-color: var(--m-case); }
.qn.is-current { box-shadow: 0 0 0 2px var(--ink); }
.qn.is-flagged::after { content: ""; position: absolute; top: 3px; right: 3px; width: 7px; height: 7px; border-radius: 50%; background: var(--m-hy); }
.exam-nav__key { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px; font-size: .78rem; color: var(--ink-3); margin: 12px 0 0; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-left: 6px; }
.dot--answered { background: color-mix(in srgb, var(--m-case) 22%, var(--surface)); border: 1px solid var(--m-case); margin-left: 0; }
.dot--flag { background: var(--m-hy); border-radius: 50%; }

.score { display: flex; align-items: center; gap: 22px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-lg); padding: 22px 26px; margin-bottom: 18px; flex-wrap: wrap; }
.score__big { font: 800 3.6rem/1 var(--sans); letter-spacing: -0.03em; margin: 0; font-variant-numeric: tabular-nums; }
.score__big span { font-size: 1.6rem; color: var(--ink-3); margin-left: 2px; }
.score__line { margin: 2px 0; color: var(--ink-2); }
.results-actions { justify-content: flex-start; margin-bottom: 30px; }
.results-sec { margin-bottom: 30px; }
.results-sec h2 { margin-bottom: 4px; }
.results-sec .muted { margin: 0 0 10px; font-size: .9rem; }
.bar-cell { display: flex; align-items: center; gap: 10px; min-width: 160px; }
.score-bar { flex: 1; height: 8px; border-radius: 4px; background: var(--tint); overflow: hidden; display: block; }
.score-bar span { display: block; height: 100%; }
.score-bar .is-good { background: var(--good); }
.score-bar .is-mid { background: var(--m-dx); }
.score-bar .is-low { background: var(--bad); }
.score-pct { font-weight: 700; font-variant-numeric: tabular-nums; width: 3.2em; text-align: right; }
.review-q .verdict { margin-bottom: 12px; }

/* ---------- glossary ---------- */
.gl {
  cursor: help; text-decoration: underline dotted; text-decoration-color: color-mix(in srgb, var(--ink-3) 80%, transparent);
  text-underline-offset: 3px; text-decoration-thickness: 1.5px; border-radius: 3px;
}
.gl:hover, .gl[aria-expanded="true"] { background: color-mix(in srgb, var(--m-gloss) 14%, transparent); text-decoration-color: var(--m-gloss); }
.glpop {
  position: absolute; z-index: 60; background: var(--surface); color: var(--ink);
  border: 1px solid var(--rule); border-top: 4px solid var(--m-gloss); border-radius: var(--r-md);
  box-shadow: 0 18px 44px -14px rgba(20, 24, 66, .45); padding: 14px 16px 12px;
}
.glpop__head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.glpop__t { font: 700 1.02rem/1.3 var(--sans); margin: 0 0 6px; text-transform: none; }
.glpop__x { border: 0; background: none; color: var(--ink-3); font-size: 1.4rem; line-height: 1; cursor: pointer; padding: 0 4px; margin: -4px -6px 0 0; }
.glpop__d { font: 400 .98rem/1.55 var(--serif); margin: 0 0 10px; }
.glpop__foot { display: flex; justify-content: space-between; gap: 10px; font-size: .8rem; color: var(--ink-3); margin: 0; }
.glpop__foot a { font-weight: 600; color: var(--ink); }
.gloss__tools { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; margin-bottom: 14px; }
.gloss__search { flex: 1 1 280px; max-width: 460px; }
.gloss__search input { width: 100%; min-height: 44px; border-radius: 22px; border: 1px solid var(--rule); background: var(--surface); color: var(--ink); padding: 0 18px; font: 400 1rem/1 var(--sans); }
.gloss__search input:focus { outline: none; border-color: var(--m-gloss); box-shadow: 0 0 0 3px color-mix(in srgb, var(--m-gloss) 25%, transparent); }
.gloss .switch input:checked { background: var(--m-gloss); }
.az { position: sticky; top: var(--top); z-index: 8; background: var(--paper); display: flex; flex-wrap: wrap; gap: 2px; padding: 8px 0; border-bottom: 1px solid var(--rule); }
.az a { min-width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center; border-radius: 6px; font: 700 .86rem/1 var(--sans); text-decoration: none; color: var(--ink-2); }
.az a:hover { background: var(--tint); color: var(--ink); }
.gloss__count { font-size: .86rem; color: var(--ink-3); margin: 12px 0 0; }
.gloss__group { scroll-margin-top: calc(var(--top) + 60px); }
.gloss__group h2 { font: 800 1.5rem/1 var(--sans); color: var(--m-gloss); margin: 26px 0 8px; }
.gloss__group dl { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 32px; }
.gloss__entry { padding: 12px 0; border-top: 1px solid var(--rule); scroll-margin-top: calc(var(--top) + 70px); border-radius: 6px; transition: background-color .8s; }
.gloss__entry.is-flash { background: var(--mark); }
.gloss__entry dt { font: 700 1rem/1.3 var(--sans); margin-bottom: 4px; }
.gloss__entry dd { margin: 0; font: 400 .96rem/1.55 var(--serif); color: var(--ink-2); }
.gloss__src { font: 600 .72rem/1 var(--sans); color: var(--m-gloss); border: 1px solid currentColor; border-radius: 10px; padding: 2px 7px; margin-left: 6px; vertical-align: 2px; }

/* ---------- diagnostic helper ---------- */
.helper-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.helper__grid { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 24px; align-items: start; }
.q-card, .result-card { background: var(--surface); border: 1px solid var(--rule); border-top: 6px solid var(--m-gloss); border-radius: var(--r-lg); padding: clamp(20px, 3.5vw, 32px); }
.q-card__step, .result-card__eyebrow { font: 700 .78rem/1 var(--sans); text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3); margin: 0 0 10px; }
.q-card h2 { font: 700 clamp(1.2rem, 2.4vw, 1.45rem)/1.3 var(--sans); margin: 0 0 10px; }
.q-card__help { color: var(--ink-2); font: 400 .98rem/1.55 var(--serif); margin: 0 0 18px; }
.opts { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.opt { width: 100%; text-align: left; font: 500 1rem/1.4 var(--sans); color: var(--ink); background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 14px 16px; cursor: pointer; }
.opt:hover { border-color: var(--m-gloss); background: color-mix(in srgb, var(--m-gloss) 6%, var(--surface)); }
.result-card { border-top-color: var(--good); }
.result-card h2 { font: 800 clamp(1.4rem, 3vw, 1.8rem)/1.2 var(--sans); margin: 0 0 8px; letter-spacing: -0.01em; }
.result-card h2:focus { outline: none; }
.result-card__line { font: 400 1.05rem/1.55 var(--serif); margin: 0 0 18px; }
.result-card h3 { font: 700 .95rem/1.3 var(--sans); margin: 18px 0 8px; }
.result-card ul { margin: 0 0 4px; padding-left: 20px; font: 400 .98rem/1.55 var(--serif); }
.result-card li { margin-bottom: 6px; }
.result-card .empty__actions { justify-content: flex-start; margin-top: 18px; }
.helper__nav { display: flex; gap: 12px; align-items: center; margin-top: 14px; }
.trail { position: sticky; top: calc(var(--top) + 20px); background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 16px 18px; }
.trail h2 { font: 700 .82rem/1 var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 0 0 12px; }
.trail ol { margin: 0; padding: 0 0 0 20px; }
.trail li { margin-bottom: 14px; }
.trail__q { margin: 0; font-size: .82rem; color: var(--ink-3); }
.trail__a { margin: 2px 0; font-weight: 700; font-size: .92rem; }
.trail__note { margin: 0; font: 400 .9rem/1.5 var(--serif); color: var(--ink-2); }
.trail .link-btn { padding: 2px 0; font-size: .8rem; }
.trail__empty { margin: 0; color: var(--ink-3); font-size: .9rem; }
.helper__caution { margin-top: 22px; font-size: .86rem; color: var(--ink-3); max-width: 80ch; }

@media (max-width: 980px) {
  .today { grid-template-columns: minmax(0, 1fr); }
  .exam-grid, .helper__grid { grid-template-columns: minmax(0, 1fr); }
  .exam-nav, .trail { position: static; }
  .exam-nav__grid { grid-template-columns: repeat(auto-fill, minmax(36px, 1fr)); }
}
@media (max-width: 720px) {
  .tools { grid-template-columns: minmax(0, 1fr); }
  .gloss__group dl { grid-template-columns: minmax(0, 1fr); }
  .rate__b { min-width: 0; flex: 1; padding: 6px 8px; }
  .card-nav__main { order: -1; flex-basis: 100%; }
  .exam-bar { flex-wrap: nowrap; gap: 8px; }
  .exam-bar .lg { display: none; }
  .exam-bar .btn { min-height: 38px; padding: 0 14px; }
  .score__big { font-size: 2.8rem; }
  .mk { grid-template-columns: minmax(0, 1fr); }
}
@media print {
  .histnav, .sitenav, .glpop { display: none !important; }
  .gl { text-decoration: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .flashcard { transition: none; }
  .g-block, .hy-topic li { transition: none; }
}

@media print {
  .topbar, .modes, .toc, .toc-mobile, .site-foot, .hy-tools { display: none !important; }
  .guide { display: block; }
  body { background: #fff; color: #000; }
}

/* ---------- educator tools: shared bits ---------- */
.btn--small { min-height: 36px; padding: 0 14px; font-size: .86rem; }
.deck-bar__right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.hy-tools__print { margin-left: auto; min-height: 38px; }
.tools--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.tool__links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.tool__links a { font: 600 .86rem/1 var(--sans); padding: 8px 12px; border-radius: 16px; background: var(--tint); text-decoration: none; }
.tool__links a:hover { box-shadow: inset 0 0 0 1px var(--ink-3); }
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 20px; margin: 0 0 12px; font-weight: 600; }
.foot-links a { color: var(--night-ink); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.foot-links a:hover { text-decoration: underline; text-underline-offset: 3px; }
.upd { display: inline-block; vertical-align: 3px; margin-left: 8px; font: 700 .7rem/1 var(--sans); letter-spacing: .04em; text-transform: uppercase; color: #fff; background: var(--m-guide); border-radius: 10px; padding: 4px 8px; }
[data-theme="dark"] .upd { color: #1A0B0D; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .upd { color: #1A0B0D; } }

/* ---------- what's new ---------- */
.news-strip-wrap { margin-top: 28px; }
.news-strip { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 12px 16px; border-radius: var(--r-md); background: var(--surface); border: 1px solid var(--rule); border-left: 4px solid var(--m-guide); text-decoration: none; }
.news-strip:hover { border-color: var(--ink-3); border-left-color: var(--m-guide); }
.news-strip__tag, .news__new { font: 700 .72rem/1 var(--sans); text-transform: uppercase; letter-spacing: .05em; color: #fff; background: var(--m-guide); border-radius: 10px; padding: 4px 8px; }
.news-strip__text { font-weight: 600; flex: 1; min-width: 12em; }
.news-strip__go { font-size: .88rem; color: var(--ink-3); text-decoration: underline; text-underline-offset: 3px; }
.news .page__head .news__new { vertical-align: 1px; }
.news__entry { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 8px 28px; padding: 24px 0; border-top: 1px solid var(--rule); max-width: 980px; }
.news__date { font: 600 .9rem/1.4 var(--sans); color: var(--ink-3); display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.news__entry.is-new .news__date { color: var(--ink); }
.news__body h2 { font: 700 1.2rem/1.3 var(--sans); margin: 0 0 10px; }
.news__body ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.news__body li { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 12px; align-items: baseline; font: 400 1rem/1.55 var(--serif); }
.news__type { font: 700 .72rem/1.2 var(--sans); text-transform: uppercase; letter-spacing: .05em; color: var(--c, var(--ink-3)); }
.news__type--chapter { --c: var(--m-case); }
.news__type--feature { --c: var(--m-pharm); }
.news__type--correction { --c: var(--m-guide); }
.news__type--update { --c: var(--m-hy); }
.news__text a { font-family: var(--sans); font-weight: 600; font-size: .9rem; white-space: nowrap; }
.news__note { color: var(--ink-3); font-size: .92rem; border-top: 1px solid var(--rule); padding-top: 18px; max-width: 980px; }

/* ---------- printable handout ---------- */
.handout-tools { display: grid; gap: 14px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-lg); padding: 18px 20px; margin-bottom: 22px; }
.handout-tools__row { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 14px; }
.handout-tools__label { font: 700 .78rem/1 var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); width: 70px; }
.handout-topics summary { cursor: pointer; font-weight: 700; padding: 4px 0; }
.handout-topics__list { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 8px 18px; padding: 10px 0 2px; }
.handout-tools__go { display: flex; align-items: center; gap: 10px 18px; flex-wrap: wrap; }
.handout-fit { margin: 0; color: var(--good); font-weight: 600; font-size: .92rem; }
.handout-fit.is-warn { color: var(--bad); }
.sheet-frame { position: relative; overflow: hidden; }
.sheets { transform-origin: top left; display: grid; gap: 24px; width: max-content; }
.sheet {
  background: #fff; color: #111; box-shadow: 0 2px 4px rgba(0,0,0,.08), 0 18px 40px -16px rgba(20,24,66,.35);
  padding: 8mm 9mm 6mm; display: flex; flex-direction: column; overflow: hidden;
  font-family: var(--sans); -webkit-print-color-adjust: exact; print-color-adjust: exact;
}
.sheet__head { display: flex; justify-content: space-between; align-items: flex-end; gap: 6mm; border-bottom: 1.2pt solid #6E1A27; padding-bottom: 2.4mm; margin-bottom: 3mm; }
.sheet__kicker { margin: 0 0 1mm; font: 700 7pt/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: #C2333B; }
.sheet__head h1 { margin: 0; font: 800 14pt/1.15 var(--sans); letter-spacing: -0.01em; color: #6E1A27; }
.sheet__src { margin: 0; font: 400 7pt/1.5 var(--sans); color: #555; text-align: right; }
.sheet__body { flex: 1; min-height: 0; overflow: hidden; column-count: 3; column-gap: 4.5mm; column-fill: auto; column-rule: .4pt solid #D9DCEA; font-size: 8pt; }
.sheet__topic { margin: 0 0 .7em; }
.sheet__topic h2 { font: 700 1.04em/1.2 var(--sans); color: #6E1A27; margin: 0 0 .3em; padding-bottom: .15em; border-bottom: .6pt solid #DF6418; break-after: avoid; }
.sheet__topic ul { margin: 0; padding-left: 1.05em; }
.sheet__topic li { font: 400 1em/1.26 var(--serif); margin: 0 0 .16em; break-inside: avoid; }
.sheet__topic li::marker { color: #DF6418; }
.sheet__topic strong { font-weight: 700; }
.sheet--blank .sheet__topic strong { color: transparent; border-bottom: .7pt solid #333; }
.sheet__none { color: #777; }
.sheet__foot { margin-top: 2mm; padding-top: 1.6mm; border-top: .5pt solid #ccc; font: 400 6.5pt/1.3 var(--sans); color: #555; }

@media print {
  body.print-handout { background: #fff !important; }
  body.print-handout .topbar, body.print-handout .site-foot, body.print-handout .skip, body.print-handout .no-print { display: none !important; }
  body.print-handout .page { padding: 0 !important; margin: 0 !important; max-width: none !important; width: auto !important; }
  body.print-handout .sheet-frame { height: auto !important; overflow: visible; }
  body.print-handout .sheets { transform: none !important; display: block; gap: 0; }
  body.print-handout .sheet { box-shadow: none !important; break-inside: avoid; break-after: page; }
  body.print-handout .sheet:last-child { break-after: auto; }
}

/* ---------- teaching mode ---------- */
.teach-setup .exam-form .select select { min-width: 260px; max-width: 100%; }
.teach-setup__hint { margin: 2px 0 0; font-size: .9rem; }
.teach-list { margin-top: 32px; max-width: 900px; }
.teach-list ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.teach-item { width: 100%; text-align: left; display: grid; gap: 4px; padding: 12px 16px; border-radius: var(--r-md); border: 1px solid var(--rule); background: var(--surface); color: var(--ink); cursor: pointer; }
.teach-item:hover { border-color: var(--m-case); }
.teach-item__meta { font: 600 .78rem/1.2 var(--sans); color: var(--ink-3); }
.teach-item__q { font: 400 .98rem/1.5 var(--serif); }

body.is-teaching { overflow: hidden; }
.teach {
  position: fixed; inset: 0; z-index: 100; display: flex; flex-direction: column;
  background: radial-gradient(120% 100% at 15% 0%, #5A1A26 0%, #6E1A27 40%, #2A0B12 100%);
  color: #F8ECE8; padding: env(safe-area-inset-top, 0px) env(safe-area-inset-right, 0px) env(safe-area-inset-bottom, 0px) env(safe-area-inset-left, 0px);
}
.teach__bar { display: flex; align-items: center; gap: 10px 18px; flex-wrap: wrap; padding: 14px clamp(16px, 4vw, 48px); }
.teach__meta { font: 700 .95rem/1.2 var(--sans); color: #F6A35C; }
.teach__pos { font: 600 .95rem/1.2 var(--sans); color: #E4BDB4; font-variant-numeric: tabular-nums; }
.teach__spacer { flex: 1; }
.tbtn { min-height: 44px; padding: 0 20px; border-radius: 22px; border: 1px solid rgba(255,255,255,.28); background: transparent; color: #F8ECE8; font: 600 1rem/1 var(--sans); cursor: pointer; }
.tbtn:hover { border-color: rgba(255,255,255,.7); }
.tbtn[disabled] { opacity: .35; cursor: default; }
.tbtn--solid { background: #F8ECE8; color: #2A0B12; border-color: #F8ECE8; min-width: 200px; }
.tbtn:focus-visible, .tchoice:focus-visible { outline: 3px solid #F6A35C; outline-offset: 3px; }
.teach__stage { flex: 1; min-height: 0; overflow-y: auto; padding: 0 clamp(16px, 5vw, 64px); }
.teach__inner { max-width: 1100px; margin: 0 auto; padding: clamp(8px, 3vh, 40px) 0 32px; }
.teach__title { font: 800 clamp(1.6rem, 3vw, 2.6rem)/1.15 var(--sans); margin: 0 0 .6em; color: #fff; letter-spacing: -0.01em; }
.teach__stem { font: 400 clamp(1.35rem, 2.5vw, 2.3rem)/1.5 var(--serif); margin: 0; color: #fff; }
.teach__stem strong { font-weight: 600; }
.teach__prompt { margin: 1.4em 0 0; font: 600 clamp(1rem, 1.6vw, 1.35rem)/1.4 var(--sans); color: #E4BDB4; }
.teach__choices { list-style: none; margin: clamp(18px, 3vh, 34px) 0 0; padding: 0; display: grid; gap: clamp(8px, 1.4vh, 14px); }
.tchoice { width: 100%; display: flex; gap: 18px; align-items: baseline; text-align: left; padding: clamp(12px, 1.8vh, 18px) 22px; border-radius: 14px; border: 1.5px solid rgba(255,255,255,.2); background: rgba(255,255,255,.05); color: #fff; font: 400 clamp(1.1rem, 1.9vw, 1.65rem)/1.4 var(--serif); cursor: pointer; }
.tchoice:hover:not([disabled]) { border-color: rgba(255,255,255,.55); background: rgba(255,255,255,.09); }
.tchoice__key { font: 800 .8em/1.6 var(--sans); color: #E4BDB4; min-width: 1.2em; }
.tchoice.is-picked { border-color: #F6A35C; background: rgba(246,163,92,.14); }
.tchoice.is-picked .tchoice__key { color: #F6A35C; }
.tchoice.is-correct { border-color: #4CCB8A; background: rgba(76,203,138,.2); }
.tchoice.is-correct .tchoice__key { color: #4CCB8A; }
.tchoice.is-wrong { border-color: #FF6B72; background: rgba(255,107,114,.16); }
.tchoice.is-dim { opacity: .45; }
.tchoice[disabled] { cursor: default; }
.teach__answer { margin-top: clamp(18px, 3vh, 32px); padding: clamp(16px, 2.4vh, 26px) clamp(18px, 2.4vw, 28px); border-radius: 16px; background: rgba(255,255,255,.08); border-left: 5px solid #4CCB8A; }
.teach__answer p { margin: 0; font: 400 clamp(1.1rem, 1.9vw, 1.6rem)/1.5 var(--serif); color: #fff; }
.teach__answer .teach__label { font: 700 clamp(.9rem, 1.3vw, 1.1rem)/1.3 var(--sans); color: #4CCB8A; text-transform: uppercase; letter-spacing: .06em; margin-bottom: .5em; }
.teach__inner.is-revealed .teach__stem { font-size: clamp(1.1rem, 1.9vw, 1.7rem); }
.teach__inner.is-revealed .teach__title { font-size: clamp(1.3rem, 2.2vw, 2rem); }
.teach__inner.is-revealed .teach__choices { margin-top: clamp(12px, 2vh, 20px); gap: 8px; }
.teach__inner.is-revealed .tchoice { padding: 8px 20px; font-size: clamp(1rem, 1.55vw, 1.35rem); }
.teach__inner.is-revealed .teach__answer { margin-top: clamp(12px, 2vh, 20px); }
.teach__inner.is-revealed .teach__answer p { font-size: clamp(1.05rem, 1.7vw, 1.45rem); }
.teach__nav { display: flex; justify-content: center; align-items: center; gap: 14px; padding: 14px clamp(16px, 4vw, 48px) 6px; }
.teach__keys { text-align: center; font: 500 .8rem/1 var(--sans); color: #C9A29A; margin: 0 0 14px; }
.teach .gl { text-decoration-color: rgba(255,255,255,.55); }
.teach .gl:hover, .teach .gl[aria-expanded="true"] { background: rgba(255,255,255,.12); }
.glpop { z-index: 200; }

@media (max-width: 980px) {
  .tools--3 { grid-template-columns: minmax(0, 1fr); }
  .news__entry { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .news__date { flex-direction: row; align-items: center; }
}
@media (max-width: 720px) {
  .news__body li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .hy-tools__print { margin-left: 0; }
  .teach__keys { display: none; }
  .teach__nav { gap: 8px; }
  .teach__nav .tbtn { padding: 0 14px; }
  .tbtn--solid { min-width: 0; flex: 1; }
  .teach__bar .tbtn { min-height: 38px; padding: 0 14px; font-size: .9rem; }
}
@media (max-height: 780px) and (min-width: 721px) {
  .teach__bar { padding-top: 10px; padding-bottom: 6px; }
  .teach__keys { display: none; }
  .teach__nav { padding-bottom: 12px; padding-top: 10px; }
  .teach__inner { padding-top: 4px; padding-bottom: 16px; }
  .teach__inner.is-revealed .teach__stem { font-size: clamp(1.05rem, 1.7vw, 1.45rem); line-height: 1.42; }
  .teach__inner.is-revealed .tchoice { padding: 6px 18px; font-size: clamp(.98rem, 1.4vw, 1.2rem); }
  .teach__inner.is-revealed .teach__answer { padding: 12px 20px; }
  .teach__inner.is-revealed .teach__answer p { font-size: clamp(1rem, 1.5vw, 1.3rem); }
}
.teach-setup .exam-form fieldset { min-width: 0; }
.teach-setup .exam-form .select { max-width: 100%; }
.teach-setup .exam-form .select select { min-width: 0; width: 100%; text-overflow: ellipsis; }
@media (min-width: 721px) { .teach-setup .exam-form .select select { min-width: 260px; width: auto; } }

/* =====================================================================
   Stahl Study Companion additions and overrides
   ===================================================================== */
.c-mech { --c: var(--m-mech); }
.c-drug { --c: var(--m-drug); }
.c-clin { --c: var(--m-clin); }
.c-upd { --c: var(--m-upd); }
body { padding-bottom: 0; }

/* ---------- top bar ---------- */
.topbar { background: var(--night); }
.topbar__inner { max-width: none; padding-left: clamp(10px, 2vw, 22px); padding-right: clamp(10px, 2vw, 22px); gap: 8px 12px; flex-wrap: nowrap; }
.brand__name { font-family: var(--display); font-weight: 700; font-size: 1.12rem; letter-spacing: 0; }
.brand__sub { font-family: var(--sans); }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%; flex-shrink: 0; padding: 0;
  border: 1px solid rgba(255,255,255,.18); background: transparent; color: var(--night-ink); cursor: pointer;
  display: grid; place-items: center;
}
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn:hover { background: rgba(255,255,255,.1); }
.menu-btn { display: grid; }
.search { max-width: 560px; margin-left: auto; margin-right: auto; }
.badge { background: var(--accent); color: var(--accent-ink); }
.badge--warn { background: #FF9AAE; }

/* ---------- shell: sidebar + content ---------- */
.shell { display: flex; align-items: stretch; flex: 1; min-width: 0; }
.content { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.sidenav {
  width: var(--side-w); flex-shrink: 0; background: var(--side); border-right: 1px solid var(--rule);
  position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; overscroll-behavior: contain;
  scrollbar-width: thin;
}
.nav-collapsed .sidenav { display: none; }
.sidenav__head { display: none; }
.sidenav__body { padding: 14px 12px 40px; }
.nav-group { padding: 6px 0 10px; border-bottom: 1px solid var(--rule); }
.nav-group:last-child { border-bottom: 0; }
.nav-group ul, .nav-group ol { list-style: none; margin: 0; padding: 0; }
.nav-label { font: 700 .72rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin: 10px 10px 8px; }
.nav-label a { color: inherit; text-decoration: none; }
.nav-label a:hover { color: var(--ink); text-decoration: underline; }
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 9px;
  text-decoration: none; color: var(--ink-2); font: 600 .92rem/1.2 var(--sans);
}
.nav-item:hover { background: var(--tint); color: var(--ink); }
.nav-item.is-active { background: color-mix(in srgb, var(--accent) 14%, var(--surface)); color: var(--ink); box-shadow: inset 3px 0 0 var(--accent); }
.nav-item .badge { margin-left: auto; }
.nav-ico { width: 19px; height: 19px; flex-shrink: 0; color: var(--ink-3); }
.nav-item.is-active .nav-ico { color: var(--accent); }
.nav-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--c); margin: 0 5px 0 5px; flex-shrink: 0; }
.nav-item--lib.is-active { box-shadow: inset 3px 0 0 var(--c); background: color-mix(in srgb, var(--c) 12%, var(--surface)); }
.nav-chapters { display: grid; gap: 1px; }
.nav-ch > a {
  display: grid; grid-template-columns: 26px 1fr auto; align-items: baseline; gap: 6px; padding: 7px 10px; border-radius: 9px;
  text-decoration: none; color: var(--ink-2); font: 500 .9rem/1.3 var(--sans);
}
.nav-ch > a:hover { background: var(--tint); color: var(--ink); }
.nav-ch__n { font: 700 .95rem/1.3 var(--display); color: var(--accent); text-align: right; font-variant-numeric: tabular-nums; }
.nav-ch.is-soon > a { color: var(--ink-3); }
.nav-ch.is-soon .nav-ch__n { color: var(--ink-3); }
.nav-soon { font: 700 .62rem/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); border: 1px solid var(--rule); border-radius: 8px; padding: 3px 5px; align-self: center; }
.nav-ch.is-current > a { background: var(--surface); color: var(--ink); font-weight: 700; box-shadow: 0 0 0 1px var(--rule); }
.nav-modes { margin: 4px 0 8px 36px !important; border-left: 2px solid var(--rule); padding-left: 8px !important; }
.nav-mode { display: flex; align-items: center; gap: 8px; padding: 5px 8px; border-radius: 7px; text-decoration: none; font: 500 .86rem/1.25 var(--sans); color: var(--ink-2); }
.nav-mode::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--c); flex-shrink: 0; }
.nav-mode:hover { background: var(--tint); color: var(--ink); }
.nav-mode.is-active { color: var(--ink); font-weight: 700; background: color-mix(in srgb, var(--c) 13%, transparent); }
.nav-backdrop { display: none; }

/* ---------- bottom tab bar (phones and tablets) ---------- */
.tabbar { display: none; }

@media (max-width: 1099px) {
  .menu-btn { display: grid; }
  .collapse-btn { display: none; }
  .sidenav, .nav-collapsed .sidenav {
    display: block; position: fixed; top: 0; left: 0; bottom: 0; height: auto; z-index: 90;
    width: min(330px, 88vw); transform: translateX(-102%); transition: transform .25s cubic-bezier(.2,.7,.2,1);
    box-shadow: 0 0 0 rgba(0,0,0,0); padding-top: env(safe-area-inset-top, 0px);
  }
  body.drawer-open .sidenav { transform: none; box-shadow: 18px 0 48px rgba(10, 30, 20, .3); }
  body.drawer-open { overflow: hidden; }
  .sidenav__head { display: flex; align-items: center; justify-content: space-between; padding: 12px 14px 6px 22px; position: sticky; top: 0; background: var(--side); z-index: 1; }
  .sidenav__title { font: 700 1.1rem/1 var(--display); }
  .sidenav__close { color: var(--ink); border-color: var(--rule); }
  .sidenav__close:hover { background: var(--tint); }
  .nav-backdrop { display: block; position: fixed; inset: 0; z-index: 85; background: rgba(12, 28, 20, .45); }
  .nav-backdrop[hidden] { display: none; }
  .tabbar {
    display: grid; grid-template-columns: repeat(5, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 70;
    background: var(--surface); border-top: 1px solid var(--rule); padding-bottom: env(safe-area-inset-bottom, 0px);
    box-shadow: 0 -6px 24px -14px rgba(10, 30, 20, .35);
    transition: transform .22s cubic-bezier(.2,.7,.2,1);
  }
  body.tabbar-hidden .tabbar { transform: translateY(105%); box-shadow: none; }
  @media (prefers-reduced-motion: reduce) { .tabbar { transition: none; } }
  .tabbar a, .tabbar button {
    position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
    min-height: 58px; padding: 6px 2px; border: 0; background: none; color: var(--ink-3); text-decoration: none;
    font: 600 .7rem/1 var(--sans); cursor: pointer;
  }
  .tabbar svg { width: 23px; height: 23px; }
  .tabbar .is-active, .tabbar [aria-expanded="true"] { color: var(--accent); }
  .tabbar .is-active::before { content: ""; position: absolute; top: 0; left: 28%; right: 28%; height: 3px; border-radius: 0 0 3px 3px; background: var(--accent); }
  .tabbar .badge { position: absolute; top: 5px; left: calc(50% + 6px); min-width: 17px; height: 17px; line-height: 17px; font-size: .64rem; padding: 0 4px; }
  .site-foot { padding-bottom: calc(66px + env(safe-area-inset-bottom, 0px)); }
  body.is-teaching .tabbar { display: none; }
}
@media (max-width: 720px) {
  .topbar__inner { flex-wrap: wrap; }
  .search { order: 5; flex-basis: 100%; max-width: none; margin: 0; }
  .theme-btn { margin-left: auto; }
  .histnav .hist-btn { width: 34px; height: 34px; }
  .icon-btn { width: 38px; height: 38px; }
}

/* ---------- hero (spring) ---------- */
.hero {
  background:
    radial-gradient(60% 90% at 8% 0%, var(--hero-a) 0%, transparent 70%),
    radial-gradient(55% 80% at 95% 20%, var(--hero-b) 0%, transparent 70%),
    radial-gradient(60% 70% at 60% 100%, var(--hero-c) 0%, transparent 70%),
    var(--paper);
  color: var(--ink); border-bottom: 1px solid var(--rule);
}
.hero__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); padding-top: clamp(32px, 6vw, 72px); padding-bottom: clamp(32px, 6vw, 72px); }
.hero__kicker { font: 700 .8rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin: 0 0 14px; }
.hero h1 { font: 800 clamp(2.2rem, 4.6vw, 3.7rem)/1.02 var(--display); letter-spacing: -0.02em; color: var(--ink); max-width: 12ch; }
.hero__lede { color: var(--ink-2); font-family: var(--serif); }
.hero .btn { background: var(--surface); color: var(--ink); border-color: var(--rule); }
.hero .btn:hover { border-color: var(--ink-3); }
.hero .btn--solid { background: var(--night); color: var(--night-ink); border-color: var(--night); }
.btn--solid { background: var(--night); color: var(--night-ink); border-color: var(--night); }
:root[data-theme="dark"] .btn--solid, :root[data-theme="dark"] .hero .btn--solid { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn--solid, :root:not([data-theme="light"]) .hero .btn--solid { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); } }

.bloom { display: grid; grid-template-columns: 92px minmax(30px, .7fr) minmax(220px, 1.7fr); align-items: stretch; }
.bloom__for { grid-column: 1 / -1; font: 500 .92rem/1.3 var(--sans); color: var(--ink-3); margin: 0 0 12px; }
.bloom__for a { color: var(--ink); font-weight: 700; }
.bloom__art { grid-column: 1 / 3; position: relative; display: grid; grid-template-columns: 92px 1fr; align-items: center; }
.bloom__soma { width: 92px; height: 92px; position: relative; z-index: 1; filter: drop-shadow(0 6px 10px rgba(70,20,30,.2)); }
.bloom__svg { width: 100%; height: 100%; display: block; margin-left: -18px; width: calc(100% + 18px); }
.bloom .spectrum { grid-column: 3; }
.bloom .spectrum a { position: relative; border-left: 0; padding: 10px 0 10px 26px; }
.bloom__bud { position: absolute; left: 0; top: 50%; width: 16px; height: 16px; margin-top: -8px; border-radius: 50% 50% 50% 4px; background: var(--c); transform: rotate(-45deg); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c) 22%, transparent); }
.bloom .spectrum__label { color: var(--ink); font-family: var(--sans); }
.bloom .spectrum__blurb { color: var(--ink-2); }
.bloom .spectrum a:hover .spectrum__label { color: var(--c); }

/* ---------- headings in the display face ---------- */
.home-section h2, .page__head h1, .g-part h2 { font-family: var(--display); font-weight: 700; letter-spacing: -0.01em; }
.chapter-row__num, .ch-num { font-family: var(--display); color: var(--accent); -webkit-text-stroke: 0; font-weight: 800; }
.chapter-row.is-soon { opacity: .72; background: transparent; border-style: dashed; }
.chapter-row.is-soon .chapter-row__num { color: var(--ink-3); }
.soon-tag { display: inline-block; vertical-align: 3px; margin-left: 6px; font: 700 .66rem/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); border: 1px solid var(--rule); border-radius: 10px; padding: 4px 7px; }
.meter__bar span { background: linear-gradient(90deg, var(--m-guide), var(--m-hy), var(--m-mech), var(--m-drug), var(--m-clin), var(--m-case)); }
.meter__bar .meter__learn { background: var(--m-hy); }
.tools--lib { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.tool--lib, .tools .tool.c-drug, .tools .tool.c-mech { border-top: 4px solid var(--c); }
.tool .tool__ch { color: var(--c, var(--ink-3)); }

/* ---------- chapter header ---------- */
.ch-head__inner { padding-top: 18px; }
.chnav { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.chnav__btn { display: inline-flex; align-items: center; gap: 6px; min-height: 34px; padding: 0 12px; border-radius: 17px; border: 1px solid var(--rule); background: var(--paper); text-decoration: none; font: 600 .86rem/1 var(--sans); color: var(--ink-2); }
.chnav__btn span[aria-hidden] { font-size: 1.2rem; line-height: 1; margin-top: -2px; }
.chnav__btn:hover { border-color: var(--ink-3); color: var(--ink); }
.chnav__btn.is-off { visibility: hidden; padding: 0; width: 0; border: 0; }
.chnav__menu { position: relative; }
.chnav__menu summary { list-style: none; display: inline-flex; align-items: center; gap: 8px; min-height: 34px; padding: 0 14px; border-radius: 17px; border: 1px solid var(--rule); background: var(--paper); font: 600 .86rem/1 var(--sans); cursor: pointer; color: var(--ink-2); }
.chnav__menu summary::-webkit-details-marker { display: none; }
.chnav__menu summary::after { content: ""; width: 7px; height: 7px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg) translate(-2px, -2px); }
.chnav__menu[open] summary { border-color: var(--ink-3); color: var(--ink); }
.chnav__menu ol { position: absolute; z-index: 40; top: calc(100% + 6px); left: 0; width: min(380px, 86vw); list-style: none; margin: 0; padding: 6px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); box-shadow: 0 18px 44px -14px rgba(20, 50, 35, .4); max-height: 70vh; overflow: auto; }
.chnav__menu li a { display: grid; grid-template-columns: 28px 1fr; gap: 6px; padding: 8px 10px; border-radius: 8px; text-decoration: none; font: 500 .9rem/1.3 var(--sans); color: var(--ink-2); }
.chnav__menu li a span { font: 700 .95rem/1.3 var(--display); color: var(--accent); text-align: right; }
.chnav__menu li a:hover { background: var(--tint); color: var(--ink); }
.chnav__menu li a.is-current { background: var(--tint); color: var(--ink); font-weight: 700; }
.chnav__menu li a.is-soon { color: var(--ink-3); }
.chnav__menu li a.is-soon span { color: var(--ink-3); }
.chnav__menu em { font-style: normal; font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); }
.ch-head__title { align-items: flex-start; }
.ch-head__pages { margin: 6px 0 0; font-size: .86rem; color: var(--ink-3); }
.ch-head h1 { font-family: var(--display); font-weight: 700; letter-spacing: -0.01em; }

/* ---------- study guide additions ---------- */
.g-sec__head { display: flex; align-items: flex-start; gap: 10px; max-width: var(--measure); }
.g-sec__head h3 { flex: 1; margin-bottom: 4px; }
.g-pages { margin: 0 0 12px !important; font: 600 .8rem/1.2 var(--sans) !important; color: var(--ink-3); letter-spacing: .02em; }
.toc a.is-current { border-left-color: var(--accent); }
.g-n { color: var(--accent); }
.bm-btn { flex-shrink: 0; width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--rule); background: var(--surface); color: var(--ink-3); display: grid; place-items: center; cursor: pointer; padding: 0; }
.bm-btn svg { width: 17px; height: 17px; fill: none; }
.bm-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.bm-btn.is-on { color: var(--m-guide); border-color: color-mix(in srgb, var(--m-guide) 45%, var(--rule)); }
.bm-btn.is-on svg { fill: currentColor; }
.callout--pearl { --c: var(--m-clin); }
.callout--analogy { --c: var(--m-mech); background: color-mix(in srgb, var(--m-mech) 6%, var(--surface)); }
.callout--mnemonic { --c: var(--m-guide); }
.callout--key { --c: var(--m-drug); background: color-mix(in srgb, var(--m-drug) 6%, var(--surface)); }
.callout--exam { --c: var(--m-hy); }
.callout--caution { --c: var(--m-case); }
.update-box { margin: 6px 0 20px; background: var(--upd-bg); border: 1.5px dashed color-mix(in srgb, var(--m-upd) 70%, transparent); border-radius: var(--r-md); padding: 14px 18px; }
.update-box__tag { margin: 0 0 6px !important; font: 800 .72rem/1 var(--sans) !important; letter-spacing: .08em; text-transform: uppercase; color: var(--m-upd); }
.update-box__title { font: 700 1rem/1.35 var(--sans) !important; margin: 0 0 4px !important; }
.update-box p { margin: 0 0 8px; font: 400 1rem/1.6 var(--serif); }
.update-box .update-box__note { margin: 0 !important; font: 500 .8rem/1.4 var(--sans) !important; color: var(--ink-3); }
.flow { margin: 8px 0 22px; max-width: 100%; }
.flow__title { font: 700 .95rem/1.3 var(--sans); margin: 0 0 10px; }
.flow__steps { list-style: none; margin: 0; padding: 0 !important; display: flex; flex-wrap: wrap; gap: 10px 0; counter-reset: none; }
.flow__step { --c: var(--accent); position: relative; flex: 1 1 140px; min-width: 120px; background: var(--surface); border: 1px solid var(--rule); border-top: 4px solid var(--c); border-radius: 10px; padding: 10px 12px 10px; margin: 0 20px 0 0 !important; font-family: var(--sans) !important; }
.flow__step:not(:last-child)::after { content: ""; position: absolute; right: -16px; top: 50%; width: 10px; height: 10px; border-top: 2.5px solid var(--ink-3); border-right: 2.5px solid var(--ink-3); transform: translateY(-50%) rotate(45deg); }
.flow__step:last-child { margin-right: 0 !important; }
.flow__n { display: block; font: 800 .7rem/1 var(--sans); letter-spacing: .07em; text-transform: uppercase; color: var(--c); margin-bottom: 5px; }
.flow__step b { display: block; font: 700 .95rem/1.25 var(--sans); }
.flow__step > span:not(.flow__n) { display: block; font: 400 .84rem/1.4 var(--sans); color: var(--ink-2); margin-top: 3px; }
.flow__note { font: 400 .86rem/1.5 var(--sans) !important; color: var(--ink-3); margin: 10px 0 0 !important; }
.flow--v .flow__steps { flex-direction: column; gap: 14px; }
.flow--v .flow__step { margin: 0 !important; flex-basis: auto; }
.flow--v .flow__step:not(:last-child)::after { right: auto; left: 24px; top: auto; bottom: -13px; transform: rotate(135deg); }
@media (max-width: 720px) {
  .flow__steps { flex-direction: column; gap: 14px; }
  .flow__step { margin: 0 !important; flex-basis: auto; }
  .flow__step:not(:last-child)::after { right: auto; left: 24px; top: auto; bottom: -13px; transform: rotate(135deg); }
}
.compare-cards__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin: 6px 0 20px; }
.cmp-card { --c: var(--accent); background: var(--surface); border: 1px solid var(--rule); border-top: 4px solid var(--c); border-radius: var(--r-md); padding: 12px 16px; }
.cmp-card__t { font: 700 1rem/1.3 var(--sans) !important; margin: 0 0 6px !important; color: var(--ink); }
.g-sec .cmp-card ul { margin: 0; padding-left: 1.1em; }
.g-sec .cmp-card li { font-size: .95rem; line-height: 1.5; }
.case { background: color-mix(in srgb, var(--accent) 7%, var(--surface)); border-left: 4px solid var(--accent); }
.xref { color: inherit; text-decoration: underline; text-decoration-color: var(--m-drug); text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
.xref--nt { text-decoration-color: var(--m-mech); }
.xref--target { text-decoration-color: var(--m-guide); }
.xref:hover { color: var(--m-drug); }

/* ---------- high yield ---------- */
.hy-topic { border-top-color: var(--m-hy); }
.switch input:checked { background: var(--accent); }

/* ---------- library ---------- */
.lib-head__row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.lib-head__row h1 { margin: 0; }
.lib-head__brand { font: 600 .55em/1 var(--sans); color: var(--ink-3); vertical-align: middle; margin-left: 6px; }
.lib-tools { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; margin: 0 0 10px; }
.lib-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 32px; align-items: start; }
.lib-main { min-width: 0; max-width: 820px; }
.lib-side { position: sticky; top: calc(var(--top) + 20px); background: var(--surface); border: 1px solid var(--rule); border-top: 4px solid var(--c, var(--accent)); border-radius: var(--r-md); padding: 14px 18px; }
.lib-side h2 { font: 700 .74rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin: 14px 0 10px; }
.lib-side h2:first-child { margin-top: 2px; }
.lib-lede { font: 400 1.12rem/1.6 var(--serif); color: var(--ink-2); margin: 0 0 18px; }
.lib-sec { margin: 0 0 24px; }
.lib-sec h2 { font: 700 1.1rem/1.3 var(--sans); margin: 0 0 10px; padding-bottom: 6px; border-bottom: 2px solid color-mix(in srgb, var(--c, var(--accent)) 40%, var(--rule)); }
.lib-sec p, .lib-sec li { font: 400 1.02rem/1.65 var(--serif); }
.lib-sec ul { padding-left: 1.2em; margin: 0; }
.lib-sec li { margin-bottom: 6px; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin: 0 0 18px; padding: 14px 18px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); }
.kv dt { font: 700 .8rem/1.6 var(--sans); color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; }
.kv dd { margin: 0; font-weight: 600; }
.facts { list-style: none; padding: 0 !important; }
.facts li { padding: 10px 0; border-top: 1px solid var(--rule); margin: 0 !important; }
.facts li:first-child { border-top: 0; padding-top: 0; }
.ref-chip { display: inline-block; font: 700 .74rem/1 var(--sans); color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--rule)); border-radius: 10px; padding: 4px 8px; text-decoration: none; white-space: nowrap; vertical-align: 1px; }
a.ref-chip:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.ref-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.side-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: .92rem; }
.side-links a { font-weight: 600; }
.side-links--bars li { display: grid; grid-template-columns: 1fr 60px; gap: 2px 8px; align-items: center; }
.side-links--bars .muted { grid-column: 1 / -1; font-size: .76rem; margin-top: -3px; }
.key6 { display: inline-block; font: 700 .64rem/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--m-mech); border: 1px solid currentColor; border-radius: 9px; padding: 3px 6px; vertical-align: 2px; }
.drug-grid, .nt-grid, .target-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.target-grid { grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); }
.drug-card, .nt-card, .target-card { display: flex; flex-direction: column; gap: 4px; height: 100%; padding: 14px 16px; border-radius: var(--r-md); background: var(--surface); border: 1px solid var(--rule); text-decoration: none; }
.drug-card { border-top: 4px solid var(--m-drug); }
.nt-card { border-top: 4px solid var(--m-mech); }
.target-card { border-left: 4px solid var(--m-guide); }
.drug-card:hover, .nt-card:hover, .target-card:hover { border-color: var(--ink-3); }
.drug-card__name, .nt-card__name, .target-card__name { font: 700 1.02rem/1.25 var(--sans); }
.drug-card__brand { font-size: .82rem; color: var(--ink-3); margin-top: -3px; }
.drug-card__cls { font: 600 .8rem/1.3 var(--sans); color: var(--m-drug); }
.drug-card__mech, .nt-card__sum { font-size: .86rem; color: var(--ink-2); line-height: 1.45; }
.nt-card__abbr { font: 800 1.5rem/1 var(--display); color: var(--m-mech); }
.target-card__meta { font-size: .8rem; color: var(--ink-3); }
.nt-fam { margin-top: 22px; }
.nt-fam h2 { font: 700 1.15rem/1.2 var(--display); margin: 0 0 12px; }
.profile { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 14px 16px; }
.profile__row { display: grid; grid-template-columns: minmax(90px, 150px) minmax(80px, 1fr) minmax(110px, 1.1fr); gap: 12px; align-items: center; padding: 6px 0; border-top: 1px solid var(--rule); font: 500 .92rem/1.3 var(--sans); }
.profile__row:first-child { border-top: 0; }
.profile__t a { font-weight: 700; }
.profile__bar, .mini { display: block; height: 10px; background: var(--tint); border-radius: 5px; overflow: hidden; }
.mini { height: 8px; width: 100%; min-width: 50px; }
.pbar { display: block; height: 100%; border-radius: 5px; }
.pbar--block, .pkey--block { background: var(--m-guide); }
.pbar--stim, .pkey--stim { background: var(--m-clin); }
.pbar--partial, .pkey--partial { background: var(--m-mech); }
.pbar--mod, .pkey--mod { background: var(--m-drug); }
.profile__a small { display: block; color: var(--ink-3); font-size: .78rem; margin-top: 2px; }
.profile__key { margin: 10px 0 0; font-size: .78rem; color: var(--ink-3); line-height: 1.7; }
.pkey { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin: 0 4px 0 10px; vertical-align: -1px; }
.pkey:first-child { margin-left: 0; }
.fx-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.fx { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 12px 16px; border-top: 4px solid var(--c); }
.fx--stim { --c: var(--m-clin); } .fx--block { --c: var(--m-guide); }
.fx h3 { font: 700 .95rem/1.3 var(--sans); margin: 0 0 6px; color: var(--c); }
.cmp-table th a { font-weight: 700; }
.cmp-table td { min-width: 160px; }
.cmp-table ul { margin: 0; padding-left: 1.1em; }
.cmp-table small { color: var(--ink-3); }
.cmp-pick .select select { min-width: 180px; }
.bm-list, .upd-list { list-style: none; margin: 0; padding: 0; max-width: 860px; }
.bm-list li { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid var(--rule); }
.bm-list a { flex: 1; text-decoration: none; display: grid; gap: 2px; }
.bm-list__sub { font-size: .8rem; color: var(--ink-3); }
.bm-list__t { font-weight: 700; }
.upd-list li { padding: 14px 0; border-top: 1px solid var(--rule); }
.upd-list__where { font: 700 .9rem/1.3 var(--sans); }
.soon { max-width: 760px; background: var(--surface); border: 1px dashed var(--rule); border-radius: var(--r-lg); padding: clamp(22px, 4vw, 40px); }
.soon__kicker { font: 700 .78rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin: 0 0 10px; }
.soon h1 { font: 700 clamp(1.5rem, 3vw, 2.1rem)/1.15 var(--display); margin: 0 0 12px; }
.soon__sum { font: 400 1.08rem/1.6 var(--serif); color: var(--ink-2); }
.soon__note { color: var(--ink-3); margin-bottom: 20px; }
.lib-page .table-wrap { margin-top: 0; }

/* ---------- print all ---------- */
.pa-ch { margin: 28px 0; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 22px 26px; }
.pa-ch__head p { margin: 0; font-size: .8rem; color: var(--ink-3); }
.pa-ch__head h2 { font: 700 1.3rem/1.2 var(--display); margin: 4px 0 14px; padding-bottom: 8px; border-bottom: 2px solid var(--accent); }
.pa-ch__body { columns: 2 320px; column-gap: 28px; }
.pa-ch__body h3 { font: 700 .98rem/1.3 var(--sans); color: var(--night); margin: 0 0 6px; break-after: avoid; }
.pa-ch__body .sheet__topic { break-inside: avoid-column; margin-bottom: 14px; }
.pa-ch__body li { font: 400 .92rem/1.5 var(--serif); margin-bottom: 4px; }
.pa-ch__foot { margin: 14px 0 0; padding-top: 8px; border-top: 1px solid var(--rule); font-size: .76rem; color: var(--ink-3); }
@media print {
  body.print-all-on .topbar, body.print-all-on .sidenav, body.print-all-on .tabbar, body.print-all-on .site-foot, body.print-all-on .no-print { display: none !important; }
  body.print-all-on .pa-ch { break-before: page; border: 0; padding: 0; margin: 0; }
  body.print-all-on .pa-ch:first-of-type { break-before: auto; }
  body.print-all-on .pa-ch__body { columns: 2; font-size: 9.5pt; }
}

/* ---------- printable handout colors ---------- */
.sheet__head { border-bottom-color: #6E1A27; }
.sheet__kicker { color: #B03A5B; }
.sheet__head h1, .sheet__topic h2 { color: #6E1A27; }
.sheet__topic h2 { border-bottom-color: #B04A14; }
.sheet__topic li::marker { color: #B04A14; }
.sheet__body { column-rule-color: #EAD9D2; }

/* ---------- teaching mode (spring night) ---------- */
.teach { background: radial-gradient(120% 100% at 15% 0%, #5A1A26 0%, #3A0E17 45%, #1E070C 100%); color: #F8ECE8; }
.teach__meta { color: #F4A361; }
.teach__pos, .teach__prompt, .teach__keys { color: #DDB8B0; }
.tbtn--solid { background: #F8ECE8; color: #2A0B12; border-color: #F8ECE8; }
.tbtn:focus-visible, .tchoice:focus-visible { outline-color: #EE8A3C; }
.tchoice.is-picked { border-color: #EE8A3C; background: rgba(238,138,60,.16); }
.tchoice.is-picked .tchoice__key { color: #EE8A3C; }
.tchoice__key { color: #DDB8B0; }

/* ---------- misc ---------- */
.exam-q { border-top-color: var(--m-case); }
.site-foot { background: var(--night-deep); }
.page__head h1 { font-weight: 700; }
.face__q, .face__a, .choice, .exam-q__stem { font-family: var(--serif); }
.filter[aria-pressed="true"], .seg input:checked + span { background: var(--night); color: var(--night-ink); border-color: var(--night); }
@media (max-width: 980px) {
  .lib-grid { grid-template-columns: minmax(0, 1fr); }
  .lib-side { position: static; }
  .bloom { grid-template-columns: minmax(0, 1fr); }
  .bloom__art { display: none; }
  .bloom .spectrum { grid-column: 1; }
}
@media (max-width: 720px) {
  .profile__row { grid-template-columns: minmax(70px, 110px) 1fr; }
  .profile__a { grid-column: 1 / -1; margin-top: -4px; font-size: .82rem; color: var(--ink-2); }
  .kv { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .kv dd { margin-bottom: 8px; }
  .chnav__lbl { display: none; }
}
@media print {
  .sidenav, .tabbar, .nav-backdrop, .bm-btn, .chnav { display: none !important; }
  .shell { display: block; }
}
.pbar--unk { background-image: repeating-linear-gradient(135deg, rgba(255,255,255,.55) 0 5px, transparent 5px 10px); opacity: .55; }
.bloom .spectrum { grid-auto-rows: 1fr; }
@media (min-width: 1100px) and (max-width: 1299px) {
  html:not(.nav-collapsed) .guide { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 22px; }
  html:not(.nav-collapsed) .guide .toc { display: none; }
  html:not(.nav-collapsed) .toc-mobile { display: block; position: sticky; top: var(--top); z-index: 10; background: var(--paper); padding: 10px 0; margin-bottom: 8px; }
  html:not(.nav-collapsed) .toc-mobile details { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); }
  html:not(.nav-collapsed) .toc-mobile summary { padding: 12px 16px; font-weight: 700; cursor: pointer; }
  html:not(.nav-collapsed) .toc-mobile .toc { display: block; position: static; max-height: 55vh; padding: 0 8px 8px; }
  html:not(.nav-collapsed) .lib-grid { grid-template-columns: minmax(0, 1fr) 240px; gap: 22px; }
}
.steps li::before { background: var(--accent); color: var(--accent-ink); }
:root[data-theme="dark"] .steps li::before { color: var(--accent-ink); }


/* home artwork: the brain icon at the root of the branches */
.bloom { grid-template-columns: 124px minmax(30px, .7fr) minmax(220px, 1.7fr); }
.bloom__art { grid-template-columns: 124px 1fr; }
.bloom__soma { width: 124px; height: 124px; border-radius: 28px; filter: drop-shadow(0 10px 22px rgba(0,0,0,.35)); }
.bloom__svg { margin-left: -6px; width: calc(100% + 6px); }
.brand img { border-radius: 9px; }
:root[data-theme="dark"] .filter[aria-pressed="true"], :root[data-theme="dark"] .seg input:checked + span { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.lib-sec .profile__key { font: 400 .78rem/1.7 var(--sans); color: var(--ink-3); }
.lib-sec .profile__a small { font-family: var(--sans); }
@media (max-width: 1299px) { .g-sec { scroll-margin-top: calc(var(--top) + 80px); } }

/* ---------- phone / narrow layout fixes (loaded last so they win) ---------- */
@media (max-width: 980px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .hero h1 { max-width: none; }
}
@media (max-width: 640px) {
  .hero__grid { padding-top: 24px; padding-bottom: 26px; gap: 18px; }
  .hero h1 { font-size: clamp(1.9rem, 9vw, 2.4rem); }
  .hero__lede { font-size: .98rem; line-height: 1.5; }
  .hero__actions { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .hero__actions .btn { width: 100%; justify-content: center; text-align: center; }
  .bloom { display: block; }
  .bloom__for { margin-bottom: 6px; }
  .bloom .spectrum { display: grid; grid-template-columns: minmax(0, 1fr); grid-auto-rows: auto; }
  .bloom .spectrum a { padding: 9px 0 9px 24px; border-top: 1px solid var(--rule); }
  .bloom .spectrum li:first-child a { border-top: 0; }
  .bloom .spectrum__blurb { font-size: .82rem; }
  .today, .tools { grid-template-columns: minmax(0, 1fr) !important; }
  .today__chapters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chapter-row { grid-template-columns: 40px minmax(0, 1fr); }
  .chapter-row .meter { grid-column: 1 / -1; }
  .chapter-row__stats { gap: 4px 12px; }
}

/* ---------- drug type chips (compare, nomenclature) ---------- */
.fam-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 14px; }
.fam-chips .filter { text-decoration: none; }
.fam-chips .muted { font-weight: 500; opacity: .75; margin-left: 2px; }
.cmp-filter { margin: 0 0 6px; }
.cmp-filter__label { font: 700 .78rem/1 var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 0 0 8px; }
.cmp-pick { align-items: end; }
.cmp-pick .gloss__search { flex: 1 1 100%; }
.nbn-jump { position: sticky; top: var(--top, 0px); z-index: 5; background: var(--paper); padding: 10px 0 6px; margin-bottom: 6px; max-height: 38vh; overflow: auto; }
.nbn-fam { margin: 0 0 26px; scroll-margin-top: 90px; }
.nbn-fam h2 { font-size: 1.15rem; margin: 0 0 8px; }
@media (max-width: 640px) {
  .fam-chips { flex-wrap: nowrap; overflow-x: auto; margin-left: -16px; margin-right: -16px; padding: 2px 16px 8px; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .fam-chips::-webkit-scrollbar { display: none; }
  .fam-chips .filter { flex: 0 0 auto; white-space: nowrap; }
  .nbn-jump { position: static; max-height: none; }
}
@media (max-width: 640px) {
  .nbn-fam .table-wrap { overflow: visible; border: 0; background: none; }
  .nbn-fam table, .nbn-fam tbody { display: block; }
  .nbn-fam thead { display: none; }
  .nbn-fam tr { display: block; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 10px 14px; margin: 0 0 10px; }
  .nbn-fam tr.table-group { background: none; border: 0; padding: 8px 2px 0; margin: 4px 0 6px; }
  .nbn-fam tr.table-group td { display: block; padding: 0; font: 700 .78rem/1.2 var(--sans); text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); }
  .nbn-fam th[scope="row"] { display: block; padding: 0 0 4px; border: 0; background: none; font-size: 1.02rem; }
  .nbn-fam td[data-label] { display: block; padding: 3px 0; border: 0; }
  .nbn-fam td[data-label]::before { content: attr(data-label); display: block; font: 700 .72rem/1.4 var(--sans); text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); }
}

/* ---------- teaching mode: session builder ---------- */
.tb { display: grid; gap: 22px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-lg); padding: 20px 22px; max-width: 980px; }
.tb__sec { min-width: 0; }
.tb__h { font: 700 .78rem/1 var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 0 0 10px; }
.tb .fam-chips { margin: 0; }
.tb-rows { display: grid; gap: 8px; }
.tb-row { display: flex; align-items: center; justify-content: space-between; gap: 8px 16px; flex-wrap: wrap; padding: 10px 12px; border: 1px solid var(--rule); border-left: 4px solid var(--c, var(--rule)); border-radius: var(--r-md); }
.tb-row__txt { display: grid; gap: 2px; min-width: 150px; }
.tb-row__name { font-weight: 700; }
.tb-row__avail { font-size: .82rem; color: var(--ink-3); }
.tb__note { margin: 10px 0 0; font-size: .9rem; }
.tb__two { display: flex; flex-wrap: wrap; gap: 18px 40px; }
.tb__go { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 14px; }
.tb__sum { margin: 0; flex-basis: 100%; color: var(--ink-2); font-size: .95rem; }
.teach-item--topic { background: transparent; border-style: dashed; }
.teach-item--topic .teach-item__q { font-family: var(--sans); font-weight: 700; }
@media (max-width: 640px) {
  .tb { padding: 16px 14px; }
  .tb .fam-chips { margin-left: -14px; margin-right: -14px; padding-left: 14px; padding-right: 14px; }
  .tb-row .seg { width: 100%; display: flex; }
  .tb-row .seg label { flex: 1; }
  .tb-row .seg span { width: 100%; justify-content: center; padding-left: 4px; padding-right: 4px; }
}

/* ---------- teaching mode: new slide types ---------- */
.teach__kicker { font: 700 clamp(.85rem, 1.2vw, 1.05rem)/1.3 var(--sans); text-transform: uppercase; letter-spacing: .08em; color: #F6A35C; margin: 0 0 .9em; }
.teach__cover { min-height: 50vh; display: flex; flex-direction: column; justify-content: center; }
.teach__topic { font: 800 clamp(2.2rem, 5vw, 4.2rem)/1.08 var(--sans); color: #fff; margin: 0; letter-spacing: -0.02em; }
.teach__stem--hy { font-size: clamp(1.5rem, 2.9vw, 2.6rem); line-height: 1.55; }
.teach__inner.is-hy.is-revealed .teach__stem--hy { font-size: clamp(1.5rem, 2.9vw, 2.6rem); }
.tblank { font: inherit; font-weight: 700; color: transparent; background: rgba(255,255,255,.1); border: 0; border-bottom: 3px solid #F6A35C; border-radius: 6px 6px 0 0; padding: 0 .15em; margin: 0 .05em; cursor: pointer; line-height: inherit; }
.tblank:hover { background: rgba(246,163,92,.2); }
.tblank.is-open { color: #F6A35C; background: rgba(246,163,92,.12); cursor: default; }
.tblank:focus-visible { outline: 3px solid #F6A35C; outline-offset: 2px; }
.teach__tally { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: clamp(14px, 2.4vh, 26px); font: 600 clamp(.9rem, 1.3vw, 1.1rem)/1.3 var(--sans); color: #E4BDB4; }
.tbtn--small { min-height: 36px; padding: 0 16px; font-size: .92rem; }
.tbtn.is-on { background: #4CCB8A; border-color: #4CCB8A; color: #0B1A13; }
.tbtn.is-on.is-miss { background: #FF7A7A; border-color: #FF7A7A; color: #2A0B0B; }
.teach__score { font: 700 .95rem/1.2 var(--sans); color: #4CCB8A; font-variant-numeric: tabular-nums; }
.teach__timer { font-variant-numeric: tabular-nums; min-width: 84px; }
.teach__timer.is-low { border-color: #FF7A7A; color: #FF7A7A; }
.teach__progress { height: 3px; background: rgba(255,255,255,.08); }
.teach__progress span { display: block; height: 100%; background: #F6A35C; transition: width .25s; }
.teach__clock { height: 5px; background: rgba(255,255,255,.06); }
.teach__clock span { display: block; height: 100%; width: 0; background: #F6A35C; transition: width .2s linear; }
.teach__clock span.is-low { background: #FF7A7A; }
@media (prefers-reduced-motion: reduce) { .teach__progress span, .teach__clock span { transition: none; } }
.teach__inner.is-card.is-revealed .teach__stem { font-size: clamp(1.25rem, 2.2vw, 2rem); }

/* ---------- teaching mode: name that drug, teams, flags, sizes, end slide ---------- */
.tclues { list-style: none; margin: 0; padding: 0; display: grid; gap: clamp(10px, 1.8vh, 18px); }
.tclue { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 16px; align-items: start; padding: clamp(12px, 1.8vh, 18px) clamp(14px, 2vw, 22px); border-radius: 14px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14); animation: tclueIn .25s ease-out; }
@keyframes tclueIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .tclue { animation: none; } }
.tclue__n { font: 800 clamp(1rem, 1.6vw, 1.4rem)/1 var(--sans); color: #2A0B12; background: #F6A35C; width: 1.9em; height: 1.9em; border-radius: 50%; display: grid; place-items: center; }
.tclue__label { margin: 0 0 .25em; font: 700 clamp(.8rem, 1.1vw, .95rem)/1.2 var(--sans); text-transform: uppercase; letter-spacing: .07em; color: #E4BDB4; }
.tclue__text { margin: 0; font: 400 clamp(1.15rem, 2.1vw, 1.9rem)/1.45 var(--serif); color: #fff; }
.teach__answer .tdrug { font: 800 clamp(1.8rem, 3.6vw, 3rem)/1.1 var(--sans); margin-bottom: .3em; }
.tdrug a { color: #fff; text-decoration: none; border-bottom: 2px solid rgba(255,255,255,.35); }
.tdrug__brand { font: 600 .45em/1 var(--sans); color: #E4BDB4; margin-left: .4em; }
.teach__teams { display: inline-flex; gap: 8px; }
.tteam { font: 700 .92rem/1 var(--sans); padding: 7px 12px; border-radius: 999px; font-variant-numeric: tabular-nums; }
.tteam b { font-size: 1.1em; margin-left: 4px; }
.tteam--a { background: rgba(110,168,255,.18); color: #9CC4FF; }
.tteam--b { background: rgba(255,154,90,.18); color: #FFB98A; }
.tbtn.tteam-btn--a.is-on { background: #6EA8FF; border-color: #6EA8FF; color: #0B1630; }
.tbtn.tteam-btn--b.is-on { background: #FF9A5A; border-color: #FF9A5A; color: #2A1206; }
.tbtn--icon { padding: 0 14px; }
.tbtn.is-flag { border-color: #F6A35C; color: #F6A35C; }
.teach__inner--s1 { zoom: 1.18; }
.teach__inner--s2 { zoom: 1.38; }
.tend .teach__topic { font-size: clamp(1.9rem, 4vw, 3.2rem); margin-bottom: .2em; }
.tend__h { font: 700 clamp(.9rem, 1.3vw, 1.1rem)/1.3 var(--sans); text-transform: uppercase; letter-spacing: .07em; color: #F6A35C; margin: clamp(18px, 3vh, 30px) 0 10px; }
.tend__list { margin: 0; padding-left: 1.4em; display: grid; gap: 10px; color: #fff; font: 400 clamp(1rem, 1.6vw, 1.35rem)/1.45 var(--serif); }
.tend__list li { padding-left: 4px; }
.tend__meta { display: block; font: 600 .72em/1.3 var(--sans); color: #E4BDB4; margin-bottom: 2px; }
.tend__none { color: #CFE9D9; font: 500 clamp(1rem, 1.5vw, 1.25rem)/1.5 var(--sans); margin-top: 18px; }
.tend__msg { color: #4CCB8A; font: 600 1rem/1.4 var(--sans); min-height: 1.4em; margin-top: 14px; }
.tb-row__fam { flex-basis: 100%; }
.tb-row__fam select { max-width: 100%; }
@media (max-width: 720px) {
  .teach__bar .tbtn--icon { padding: 0 10px; }
  .teach__teams .tteam { padding: 5px 8px; font-size: .82rem; }
  .teach__nav { flex-wrap: wrap; }
}
.teach__inner.is-revealed .tclues { gap: 8px; }
.teach__inner.is-revealed .tclue { padding: 8px 16px; }
.teach__inner.is-revealed .tclue__text { font-size: clamp(1rem, 1.5vw, 1.3rem); }
.teach__inner.is-revealed .tclue__n { font-size: .95rem; }

/* =====================================================================
   DSM-5-TR additions
   ===================================================================== */

/* ☰ chapters and tools menu (Kaplan-style), every screen size */
.menu-btn svg { width: 20px; height: 20px; }
.menu-btn[aria-expanded="true"] { background: rgba(255,255,255,.14); }
.menu-scrim { position: fixed; inset: 0; z-index: 88; background: rgba(20,4,8,.45); }
.menu-panel {
  position: fixed; z-index: 89; left: max(10px, env(safe-area-inset-left, 0px)); top: calc(var(--top) + 6px);
  width: min(420px, calc(100vw - 20px)); max-height: calc(100vh - var(--top) - 20px); max-height: calc(100dvh - var(--top) - 20px - env(safe-area-inset-bottom, 0px));
  overflow-y: auto; overscroll-behavior: contain; -webkit-overflow-scrolling: touch; padding: 8px 8px calc(28px + env(safe-area-inset-bottom, 0px));
  background: var(--surface); color: var(--ink); border: 1px solid var(--rule); border-radius: var(--r-md); box-shadow: 0 18px 48px rgba(20,4,8,.45);
}
.menu-panel[hidden], .menu-scrim[hidden] { display: none; }
.menu-panel h2 { font: 700 .72rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin: 14px 10px 6px; }
.menu-panel a { display: flex; align-items: center; gap: 12px; min-height: 40px; padding: 8px 10px; border-radius: 10px; text-decoration: none; color: var(--ink); font: 500 .95rem/1.25 var(--sans); }
.menu-panel a:hover { background: var(--tint); }
.menu-panel a.is-current { background: color-mix(in srgb, var(--accent) 16%, var(--surface)); font-weight: 700; }
.menu-panel .mn-num { flex: 0 0 1.8em; font: 700 .95rem/1 var(--display); color: var(--accent); text-align: right; }
.menu-panel .mn-ch { flex: 1; }
.menu-panel .mn-soon { font: 600 .68rem/1 var(--sans); letter-spacing: .05em; text-transform: uppercase; color: var(--ink-3); border: 1px solid var(--rule); border-radius: 9px; padding: 3px 6px; }
.menu-panel .badge { margin-left: auto; }

/* ICD-10-CM code chip */
.dx-code { display: inline-block; font: 700 .78rem/1 var(--sans); letter-spacing: .02em; color: var(--accent-ink); background: var(--accent); border-radius: 6px; padding: 4px 7px; vertical-align: 2px; }

/* criteria block */
.crit { margin: 8px 0 22px; background: var(--surface); border: 1px solid var(--rule); border-top: 4px solid var(--m-mech); border-radius: var(--r-md); padding: 16px 18px 12px; max-width: 860px; }
.crit__head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 0 0 12px; }
.crit__title { font: 800 .8rem/1.2 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--m-mech); }
.crit__pages { font: 500 .8rem/1 var(--sans); color: var(--ink-3); }
.crit__list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.crit__item { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: 4px 10px; font: 400 1rem/1.55 var(--serif); }
.crit__item--plain { grid-template-columns: minmax(0, 1fr); }
.crit__l { font: 800 1.15rem/1.3 var(--display); color: var(--m-mech); text-align: center; }
.crit__sub { margin: 6px 0 0; padding-left: 1.4em; display: grid; gap: 3px; }
.crit__sub li::marker { color: var(--m-mech); font-weight: 700; font-family: var(--sans); }
.crit__note { margin: 6px 0 0; font: 500 .88rem/1.45 var(--sans); color: var(--ink-2); background: var(--tint); border-radius: 8px; padding: 6px 10px; }
.crit__spec { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--rule); }
.crit__spec-h { margin: 0 0 8px; font: 800 .74rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.crit__spec dl { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 6px 14px; margin: 0; font-size: .94rem; }
.crit__spec dt { font-weight: 700; }
.crit__spec dd { margin: 0; color: var(--ink-2); }
.crit__foot { margin: 12px 0 0; font: 500 .82rem/1.45 var(--sans); color: var(--ink-3); }
@media (max-width: 720px) { .crit__spec dl { grid-template-columns: minmax(0, 1fr); gap: 0 0; } .crit__spec dd { margin-bottom: 8px; } }

/* duration ladder */
.ladder { margin: 8px 0 24px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 16px 18px 14px; max-width: 860px; }
.ladder__title { font: 700 .98rem/1.3 var(--sans); margin: 0 0 14px; }
.ladder__axis { position: relative; height: 18px; margin: 0 0 6px calc(var(--lad-label, 190px) + 12px); margin-right: calc(var(--lad-span, 150px) + 12px); font: 600 .72rem/1 var(--sans); color: var(--ink-3); }
.ladder__axis span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.ladder__axis span::after { content: ""; position: absolute; left: 50%; top: 14px; height: 6px; border-left: 1px solid var(--rule); }
.ladder__rows { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.ladder__row { display: grid; grid-template-columns: var(--lad-label, 190px) minmax(0, 1fr) var(--lad-span, 150px); gap: 2px 12px; align-items: center; }
.ladder__label { font: 700 .92rem/1.25 var(--sans); }
.ladder__label a { color: inherit; }
.ladder__track { position: relative; height: 22px; border-radius: 11px; background: var(--tint); }
.ladder__bar { position: absolute; top: 0; bottom: 0; border-radius: 11px; background: var(--c); }
.ladder__bar.is-open { border-top-right-radius: 0; border-bottom-right-radius: 0; background: linear-gradient(90deg, var(--c) 80%, color-mix(in srgb, var(--c) 10%, transparent)); }
.ladder__span { font: 600 .86rem/1.25 var(--sans); color: var(--ink-2); }
.ladder__note { grid-column: 2 / -1; font: 400 .82rem/1.4 var(--sans); color: var(--ink-3); margin-top: -2px; }
.ladder__foot { margin: 12px 0 0; font: 500 .82rem/1.45 var(--sans); color: var(--ink-3); }
@media (max-width: 720px) {
  .ladder { --lad-label: 100%; }
  .ladder__axis { display: none; }
  .ladder__row { grid-template-columns: minmax(0, 1fr) auto; }
  .ladder__label { grid-column: 1 / -1; }
  .ladder__track { grid-column: 1; }
  .ladder__note { grid-column: 1 / -1; }
}

/* DSM-5 → DSM-5-TR box */
.update-box--tr { background: color-mix(in srgb, var(--m-drug) 9%, var(--surface)); border-color: color-mix(in srgb, var(--m-drug) 60%, transparent); }
.update-box--tr .update-box__tag { color: var(--m-drug); }

/* callouts added for the DSM */
.callout--culture { --c: var(--m-clin); }
.callout--tr { --c: var(--m-drug); }

/* disorder library */
.dx-group { margin: 0 0 26px; }
.dx-group__h { font: 700 1.05rem/1.3 var(--display); margin: 0 0 12px; color: var(--ink-2); }
.dx-card { border-top-color: var(--m-mech); }
.dx-card .drug-card__brand { font: 700 .8rem/1 var(--sans); color: var(--accent); margin-top: 0; }
.dx-card .drug-card__cls { color: var(--m-hy); }
.dx-ddx { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.dx-ddx li { display: grid; gap: 2px; padding: 10px 14px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--r-md); }
.dx-ddx b { font: 700 .98rem/1.3 var(--sans); }
.dx-ddx span { font: 400 .96rem/1.5 var(--serif); color: var(--ink-2); }
.lib-sec .crit { margin-top: 0; }
.result-card__lib { margin: 12px 0 0; font: 600 .92rem/1.4 var(--sans); }
.helper .lib-head__row .bm-btn { margin-left: auto; }
.cmp-filter .fam-chips a.filter { text-decoration: none; }
.crit .crit__list > li, .crit .crit__sub li { margin: 0; }
.crit .crit__sub { margin-top: 4px; gap: 2px; }
.crit .crit__item > div > p { margin: 0; }
.crit .crit__list { margin: 0; padding: 0; }
.crit .crit__sub { margin-bottom: 0; padding-left: 1.4em; }
.ladder .ladder__rows { margin: 0; padding: 0; }
.ladder .ladder__row { margin: 0; }
.crit .crit__item, .crit .crit__sub li { font: 400 1rem/1.55 var(--serif); }
.lib-sec .crit li { margin: 0; padding-top: 0; padding-bottom: 0; border: 0; }
.lib-sec .crit ol { margin: 0; }

/* Compare disorders: keep the pickers inside the screen on phones */
@media (max-width: 720px) {
  .cmp-pick { flex-direction: column; align-items: stretch; gap: 10px; }
  .cmp-pick .select { display: flex; flex-direction: column; align-items: stretch; gap: 4px; max-width: 100%; min-width: 0; }
  .cmp-pick .select select { min-width: 0; width: 100%; max-width: 100%; text-overflow: ellipsis; }
  .cmp-table-wrap, .cmp-out { max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}

/* Library filter rows (disorder library, codes, glossary, time): selects never push the page wider than the screen */
@media (max-width: 720px) {
  .lib-tools { gap: 10px; }
  .lib-tools .select { display: flex; flex: 1 1 100%; min-width: 0; max-width: 100%; }
  .lib-tools .select select { flex: 1 1 auto; min-width: 0; width: 100%; max-width: 100%; text-overflow: ellipsis; }
  .lib-tools input[type="search"], .lib-tools input[type="text"] { min-width: 0; max-width: 100%; }
}