/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 75% -10%, color-mix(in srgb, var(--accent-2) 10%, transparent), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 60%),
    var(--bg);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3, h4, h5 { margin: 0; line-height: 1.2; font-weight: 650; letter-spacing: -.01em; }
p { margin: 0 0 .8em; }
kbd {
  font-family: var(--font-mono); font-size: .72em; padding: .1em .45em; border-radius: 5px;
  border: 1px solid var(--line); border-bottom-width: 2px; background: var(--surface-2); color: var(--ink-dim);
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
::selection { background: color-mix(in srgb, var(--accent) 35%, transparent); }
.ico { width: 18px; height: 18px; flex: none; }
.muted { color: var(--ink-dim); }
.small { font-size: .85em; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--surface); padding: 8px 12px; border-radius: 8px; }
.skip:focus { left: 8px; }
[hidden] { display: none !important; }

/* Scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 10px; border: 3px solid transparent; background-clip: padding-box; }

/* ── Top bar ─────────────────────────────────────────── */
.topbar {
  position: fixed; inset: 0 0 auto 0; height: 60px; z-index: 30;
  display: flex; align-items: center; gap: 18px; padding: 0 18px;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  border-bottom: 1px solid var(--line-soft);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.logo { width: 34px; height: 34px; }
.logo-ring { fill: color-mix(in srgb, var(--accent) 8%, transparent); stroke: color-mix(in srgb, var(--accent) 45%, transparent); stroke-width: 1.2; }
.logo-ecg { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 60; animation: ecg 2.4s linear infinite; filter: drop-shadow(0 0 3px var(--accent)); }
@keyframes ecg { from { stroke-dashoffset: 120; } to { stroke-dashoffset: 0; } }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-text b { font-size: 17px; letter-spacing: .02em; }
.brand-text small { font-size: 11px; color: var(--ink-dim); letter-spacing: .08em; text-transform: uppercase; }

.nav { display: flex; gap: 4px; margin: 0 auto; padding: 4px; border-radius: 999px; background: color-mix(in srgb, var(--surface) 70%, transparent); border: 1px solid var(--line-soft); }
.nav a {
  position: relative; display: flex; align-items: center; gap: 7px; padding: 7px 14px; border-radius: 999px;
  color: var(--ink-dim); font-weight: 550; font-size: 14px; transition: color .2s, background .25s var(--ease);
}
.nav a:hover { color: var(--ink); text-decoration: none; background: var(--surface-2); }
.nav a.active { color: var(--bg); background: var(--accent); box-shadow: var(--glow); }
.nav a.active .ico { stroke: var(--bg); }

.top-actions { display: flex; align-items: center; gap: 8px; }
.search-btn {
  display: flex; align-items: center; gap: 8px; height: 36px; padding: 0 10px 0 12px; min-width: 220px;
  border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-dim);
  transition: border-color .2s, box-shadow .2s;
}
.search-btn:hover { border-color: var(--accent); box-shadow: var(--glow); }
.search-btn span { flex: 1; text-align: left; font-size: 14px; }

/* ── Buttons, chips, pills ─────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px; height: 38px; padding: 0 16px;
  border-radius: 10px; font-weight: 600; font-size: 14px; white-space: nowrap;
  color: var(--bg); background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 55%, var(--accent-2)));
  box-shadow: 0 6px 20px -8px color-mix(in srgb, var(--accent) 70%, transparent);
  transition: transform .18s var(--ease), box-shadow .2s, filter .2s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); filter: brightness(1.08); }
.btn:active { transform: translateY(0) scale(.98); }
.btn .ico { width: 16px; height: 16px; }
.btn.ghost { background: var(--surface-2); color: var(--ink); box-shadow: none; border: 1px solid var(--line); }
.btn.ghost:hover { border-color: var(--accent); }
.btn.sm { height: 32px; padding: 0 12px; font-size: 13px; border-radius: 8px; }
.btn.big { height: 48px; padding: 0 26px; font-size: 16px; border-radius: 12px; }
.icon-btn {
  display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; color: var(--ink-dim);
  transition: background .2s, color .2s, transform .15s;
}
.icon-btn:hover { background: var(--surface-2); color: var(--ink); }
.icon-btn:active { transform: scale(.94); }
.icon-btn[aria-pressed="true"], .icon-btn.on { color: var(--accent); }
.icon-btn.on .ico { fill: color-mix(in srgb, var(--accent) 35%, transparent); }
.icon-btn.mini { width: 28px; height: 28px; border-radius: 8px; }
.icon-btn.mini .ico { width: 15px; height: 15px; }
.link { color: var(--accent); font-weight: 600; display: inline-flex; align-items: center; gap: 4px; }
.link .ico { width: 14px; height: 14px; }
.chip {
  display: inline-flex; align-items: center; gap: 5px; padding: 3px 9px; border-radius: 999px; font-size: 12px; font-weight: 600;
  background: color-mix(in srgb, var(--c, var(--accent)) 14%, transparent); color: color-mix(in srgb, var(--c, var(--accent)) 80%, var(--ink));
  border: 1px solid color-mix(in srgb, var(--c, var(--accent)) 30%, transparent);
}
.chip .ico { width: 14px; height: 14px; }
.chip.type { --c: var(--ink-dim); }
.chip.sys { --c: var(--sys, var(--accent)); }
.chip.link { cursor: pointer; transition: background .2s, transform .15s; }
.chip.link:hover { background: color-mix(in srgb, var(--c, var(--accent)) 28%, transparent); transform: translateY(-1px); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.pills { display: flex; flex-wrap: wrap; gap: 6px; }
.pill {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; font-size: 13px; font-weight: 550;
  color: var(--ink-dim); border: 1px solid var(--line); background: var(--surface); transition: all .2s var(--ease);
}
.pill .ico { width: 15px; height: 15px; color: var(--c, currentColor); }
.pill:hover { color: var(--ink); border-color: var(--c, var(--accent)); text-decoration: none; }
.pill[aria-pressed="true"] { color: var(--ink); background: color-mix(in srgb, var(--c, var(--accent)) 18%, var(--surface)); border-color: color-mix(in srgb, var(--c, var(--accent)) 60%, transparent); }
.seg { display: inline-flex; padding: 3px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line-soft); }
.seg button { padding: 6px 12px; border-radius: 8px; font-size: 13px; font-weight: 600; color: var(--ink-dim); transition: all .2s var(--ease); }
.seg button[aria-pressed="true"], .seg button[aria-selected="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 2px 8px rgb(0 0 0 / .25); }
.seg.big button { padding: 9px 18px; font-size: 14px; }

/* ── Cards & text ─────────────────────────────────────────── */
.card {
  background: color-mix(in srgb, var(--surface) 88%, transparent); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 18px 20px;
}
.card h4 { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: 15px; }
.card h4 .ico { color: var(--sys, var(--accent)); }
.prose p:last-child { margin-bottom: 0; }
.prose.big { font-size: 16px; line-height: 1.7; }
.prose strong { color: var(--ink); }
.lead { font-size: 16.5px; line-height: 1.55; color: var(--ink); }
.ticks { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.ticks li { position: relative; padding-left: 22px; }
.ticks li::before {
  content: ''; position: absolute; left: 2px; top: .55em; width: 9px; height: 5px; border-left: 2px solid var(--sys, var(--accent));
  border-bottom: 2px solid var(--sys, var(--accent)); transform: rotate(-45deg);
}
.fact { display: flex; flex-direction: column; gap: 2px; padding: 10px 12px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line-soft); }
.fact span { font-size: 12px; color: var(--ink-dim); }
.fact b { font-size: 14.5px; font-weight: 650; color: var(--ink); }
.facts { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; margin: 14px 0 18px; }
.kvs { margin: 14px 0 0; display: grid; gap: 10px; }
.kv { display: grid; gap: 3px; padding: 10px 12px; border-radius: 10px; background: var(--surface-2); border-left: 3px solid var(--sys, var(--accent)); }
.kv dt { font-size: 11.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-dim); font-weight: 650; }
.kv dd { margin: 0; }
.kv dd p { margin: 0 0 .4em; }
.section-h { display: flex; align-items: center; gap: 10px; font-size: 18px; margin: 28px 0 14px; }
.section-h b { font-size: 12px; color: var(--ink-dim); padding: 2px 8px; border-radius: 999px; background: var(--surface-2); }
.section-h .ico { color: var(--c, var(--accent)); width: 22px; height: 22px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); font-weight: 700; margin-bottom: 10px; }
.eyebrow .ico { width: 16px; height: 16px; }
.grad { background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--sys-reproductive)); -webkit-background-clip: text; background-clip: text; color: transparent; background-size: 200% 100%; animation: grad 8s ease-in-out infinite alternate; }
@keyframes grad { to { background-position: 100% 0; } }
.empty { max-width: 460px; margin: 60px auto; text-align: center; display: grid; gap: 12px; justify-items: center; }
.row { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }

.spinner { width: 28px; height: 28px; border-radius: 50%; border: 2.5px solid var(--line); border-top-color: var(--accent); animation: spin .8s linear infinite; margin: auto; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── App layout & view transitions ─────────────────────────────────────────── */
#app { position: fixed; inset: 60px 0 0 0; overflow: hidden; outline: none; }
#app > .view { height: 100%; overflow-y: auto; overscroll-behavior: contain; }
#app.view-in > .view { animation: view-in .5s var(--ease) both; }
@keyframes view-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes rise { from { opacity: 0; transform: translateY(14px) scale(.985); } to { opacity: 1; transform: none; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* ── Details panel ─────────────────────────────────────────── */
#panel {
  position: fixed; z-index: 25; top: 72px; right: 12px; bottom: 12px; width: min(440px, calc(100vw - 24px));
  border-radius: 18px; border: 1px solid var(--line); overflow: hidden;
  background: color-mix(in srgb, var(--bg-2) 88%, transparent);
  backdrop-filter: blur(20px) saturate(1.2); -webkit-backdrop-filter: blur(20px) saturate(1.2);
  box-shadow: var(--shadow);
  transform: translateX(calc(100% + 24px)); opacity: 0; visibility: hidden;
  transition: transform .5s var(--ease), opacity .35s var(--ease), visibility 0s .5s;
}
#panel.open { transform: none; opacity: 1; visibility: visible; transition: transform .5s var(--ease), opacity .35s var(--ease); }
.pn-inner { display: flex; flex-direction: column; height: 100%; }
.pn-head { padding: 14px 18px 0; border-bottom: 1px solid var(--line-soft); background: linear-gradient(180deg, color-mix(in srgb, var(--sys) 14%, transparent), transparent); }
.pn-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.pn-sys { display: flex; align-items: center; gap: 6px; min-width: 0; font-size: 12.5px; font-weight: 650; color: var(--sys); }
.pn-sys span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pn-sys .pn-group { color: var(--ink-dim); font-weight: 550; }
.pn-sys i { font-style: normal; color: var(--ink-faint); }
.pn-tools { display: flex; }
.pn-title { font-size: 26px; margin: 6px 0 6px; animation: rise .45s var(--ease) both; }
.pn-sub { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.pn-latin { font-style: italic; color: var(--ink-dim); font-size: 13.5px; }
.pn-aka { font-size: 12.5px; color: var(--ink-faint); margin-top: 6px; }
.pn-links { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0 4px; }
.pn-tabs { display: flex; gap: 2px; margin-top: 10px; overflow-x: auto; scrollbar-width: none; }
.pn-tabs button {
  position: relative; padding: 9px 12px; font-size: 13.5px; font-weight: 600; color: var(--ink-dim); white-space: nowrap; transition: color .2s;
}
.pn-tabs button b { font-size: 11px; padding: 1px 6px; border-radius: 999px; background: var(--surface-2); color: var(--ink-dim); }
.pn-tabs button::after { content: ''; position: absolute; left: 10px; right: 10px; bottom: -1px; height: 2.5px; border-radius: 2px; background: var(--sys); transform: scaleX(0); transition: transform .3s var(--ease); }
.pn-tabs button[aria-selected="true"] { color: var(--ink); }
.pn-tabs button[aria-selected="true"]::after { transform: scaleX(1); }
.pn-scroll { flex: 1; overflow-y: auto; overscroll-behavior: contain; }
.pn-body { padding: 18px; }
.pn-body.swap { animation: rise .35s var(--ease) both; }
.pn-body h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-dim); margin: 6px 0 10px; }
.pn-body .card { margin-bottom: 12px; padding: 14px 16px; }
.pn-body .card h4 { text-transform: none; letter-spacing: 0; color: var(--ink); font-size: 15px; }
.card.clinical { border-left: 3px solid var(--danger); }
.card.mnemonic { border-left: 3px solid var(--sys-nervous); }
.card.mnemonic h4 .ico { color: var(--sys-nervous); }
.card.clinical h4 .ico { color: var(--danger); }
.parts { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; counter-reset: p; }
.parts li {
  position: relative; padding: 10px 12px 10px 42px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line-soft);
  animation: rise .4s var(--ease) both; animation-delay: calc(var(--i) * 35ms);
}
.parts li::before { counter-increment: p; content: counter(p); position: absolute; left: 12px; top: 10px; width: 20px; height: 20px; border-radius: 6px; display: grid; place-items: center; font-size: 11px; font-weight: 700; background: color-mix(in srgb, var(--sys) 20%, transparent); color: var(--sys); }
.part-name { font-weight: 650; margin-bottom: 2px; }
.part-text { color: var(--ink-dim); font-size: 14px; }
.pn-foot { padding: 4px 18px 22px; }
.pn-foot h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-dim); margin: 10px 0 8px; }
.pn-sib { display: flex; justify-content: space-between; gap: 8px; margin-top: 18px; }
.pn-sib .btn { max-width: 48%; overflow: hidden; text-overflow: ellipsis; }

/* ── Command palette ─────────────────────────────────────────── */
#palette { position: fixed; inset: 0; z-index: 60; display: grid; place-items: start center; padding-top: 12vh; visibility: hidden; }
#palette.open { visibility: visible; }
.pal-backdrop { position: absolute; inset: 0; background: rgb(2 6 15 / .55); backdrop-filter: blur(4px); opacity: 0; transition: opacity .25s; }
#palette.open .pal-backdrop { opacity: 1; }
.pal-box {
  position: relative; width: min(640px, calc(100vw - 24px)); max-height: 70vh; display: flex; flex-direction: column;
  border-radius: 16px; border: 1px solid var(--line); background: var(--bg-2); box-shadow: var(--shadow), var(--glow); overflow: hidden;
  transform: translateY(-12px) scale(.98); opacity: 0; transition: transform .3s var(--ease), opacity .2s;
}
#palette.open .pal-box { transform: none; opacity: 1; }
.pal-input { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-bottom: 1px solid var(--line-soft); }
.pal-input .ico { color: var(--accent); width: 20px; height: 20px; }
.pal-input input { flex: 1; border: 0; outline: none; background: none; font-size: 17px; }
.pal-input input::-webkit-search-cancel-button { display: none; }
.pal-list { list-style: none; margin: 0; padding: 6px; overflow-y: auto; }
.pal-list li[role="option"] { display: flex; align-items: center; gap: 12px; padding: 9px 10px; border-radius: 10px; cursor: pointer; }
.pal-list li[aria-selected="true"] { background: color-mix(in srgb, var(--c) 14%, var(--surface)); }
.pal-ico { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; color: var(--c); background: color-mix(in srgb, var(--c) 14%, transparent); }
.pal-name { flex: 1; display: flex; flex-direction: column; font-weight: 600; min-width: 0; }
.pal-name small { font-weight: 450; color: var(--ink-dim); font-size: 12.5px; }
.pal-kind { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-faint); }
.pal-head { padding: 8px 10px 4px; font-size: 11.5px; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-faint); }
.pal-empty { padding: 24px; text-align: center; color: var(--ink-dim); }
.pal-foot { display: flex; gap: 16px; padding: 9px 14px; border-top: 1px solid var(--line-soft); font-size: 12px; color: var(--ink-faint); }

/* ── Loader & toast ─────────────────────────────────────────── */
#loader { position: fixed; inset: 0; z-index: 90; display: grid; place-content: center; justify-items: center; gap: 10px; background: var(--bg); transition: opacity .6s var(--ease), visibility 0s .6s; }
#loader.done { opacity: 0; visibility: hidden; }
.ld-ecg { width: 240px; height: 60px; }
.ld-ecg path { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 300; animation: ld 1.6s linear infinite; filter: drop-shadow(0 0 6px var(--accent)); }
@keyframes ld { from { stroke-dashoffset: 300; } to { stroke-dashoffset: -300; } }
.ld-brand { font-size: 22px; font-weight: 700; letter-spacing: .3em; text-transform: uppercase; margin: 0; }
.ld-bar { width: 220px; height: 3px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.ld-bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .3s var(--ease); box-shadow: var(--glow); }
.ld-text { font-size: 13px; color: var(--ink-dim); margin: 0; }
#toast { position: fixed; left: 50%; bottom: 24px; z-index: 70; padding: 10px 16px; border-radius: 10px; background: var(--surface-3); border: 1px solid var(--line); box-shadow: var(--shadow); transform: translate(-50%, 20px); opacity: 0; transition: all .3s var(--ease); pointer-events: none; }
#toast.show { transform: translate(-50%, 0); opacity: 1; }

/* ── Responsive shell ─────────────────────────────────────────── */
@media (max-width: 1180px) {
  .search-btn { min-width: 0; }
  .search-btn span, .search-btn kbd { display: none; }
  .brand-text small { display: none; }
}
@media (max-width: 900px) {
  /* backdrop-filter would make the top bar the containing block of the fixed bottom nav */
  .topbar { gap: 10px; padding: 0 12px; backdrop-filter: none; -webkit-backdrop-filter: none; background: color-mix(in srgb, var(--bg) 94%, transparent); }
  .nav {
    position: fixed; left: 0; right: 0; bottom: 0; margin: 0; z-index: 30; border-radius: 0; justify-content: space-around;
    padding: 6px 6px calc(6px + env(safe-area-inset-bottom)); background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: blur(16px); border: 0; border-top: 1px solid var(--line-soft);
  }
  .nav a { flex-direction: column; gap: 2px; padding: 6px 8px; font-size: 11px; border-radius: 10px; }
  .nav a.active { background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent); box-shadow: none; }
  .nav a.active .ico { stroke: var(--accent); }
  .top-actions { margin-left: auto; }
  #app { bottom: calc(62px + env(safe-area-inset-bottom)); }
  #panel { top: auto; left: 8px; right: 8px; bottom: calc(70px + env(safe-area-inset-bottom)); width: auto; height: min(68vh, 620px); transform: translateY(calc(100% + 90px)); }
  .pn-title { font-size: 22px; }
}

/* Reduced motion / animations off (body map and diagrams are handled in body.css) */
.no-anim *:not(.body-svg *, .dg *), .no-anim *::before, .no-anim *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
@media (prefers-reduced-motion: reduce) {
  *:not(.body-svg *, .dg *), *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}
/* First takeover of a server-rendered page: no entrance animations (content is already on screen). */
#app.hydrated *:not(.body-svg *, .dg *) { animation-name: none !important; }
/* Slim top progress bar while content for a page loads */
#progress { position: fixed; z-index: 80; top: 0; left: 0; height: 2.5px; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent-2)); box-shadow: var(--glow); opacity: 0; transition: width 2s var(--ease), opacity .3s; pointer-events: none; }
#progress.on { width: 70%; opacity: 1; }