:root {
  --bg: #0d1117; --panel: #141a23; --panel2: #1a212c; --line: #263040; --text: #e6edf3; --muted: #93a1b3;
  --accent: #5eead4; --accent-ink: #06231f; --warn: #f59e0b; --radius: 8px;
  --sidebar: 340px; --info: 360px; --top: 52px;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #eef1f5; --panel: #ffffff; --panel2: #f3f5f8; --line: #d5dbe4; --text: #16202c; --muted: #5a6878;
  --accent: #0f766e; --accent-ink: #ffffff; color-scheme: light;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg); color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
button, select, input { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

#app { height: 100%; display: grid; grid-template-rows: var(--top) 1fr;
  grid-template-columns: var(--sidebar) 1fr var(--info);
  grid-template-areas: "top top top" "side stage info"; }
#topbar { grid-area: top; display: flex; align-items: center; gap: 12px; padding: 0 14px;
  background: var(--panel); border-bottom: 1px solid var(--line); }
#topbar h1 { font-size: 16px; margin: 0; font-weight: 650; letter-spacing: .2px; }
#topbar h1 span { color: var(--accent); font-weight: 500; }
.spacer { flex: 1; }
.icon-btn { display: none; background: none; border: 0; padding: 6px; border-radius: 6px; }
.views { display: flex; gap: 2px; background: var(--panel2); padding: 3px; border-radius: var(--radius); }
.views button { background: none; border: 0; padding: 5px 10px; border-radius: 6px; color: var(--muted); }
.views button:hover { background: var(--line); color: var(--text); }
.lang select { background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 5px 8px; }

#sidebar { grid-area: side; background: var(--panel); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; min-height: 0; overflow: hidden; }
.search { position: relative; margin: 12px 12px 8px; }
.search svg { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--muted); }
.search input { width: 100%; padding: 9px 10px 9px 32px; background: var(--panel2);
  border: 1px solid var(--line); border-radius: var(--radius); }
.filters { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; padding: 0 12px 10px; border-bottom: 1px solid var(--line); }
.filters select { min-width: 0; background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 6px; }
.filters select:first-child { grid-column: 1 / -1; }
.check { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; }
.link { background: none; border: 0; color: var(--accent); padding: 0; text-align: right; }

#browse, #results { flex: 1; overflow: auto; padding: 10px 8px 24px; min-height: 0; }
#browse h2 { font-size: 11px; text-transform: uppercase; letter-spacing: .8px; color: var(--muted); margin: 4px 8px 8px; }
ul { list-style: none; margin: 0; padding: 0; }

.sys { border-radius: var(--radius); margin-bottom: 6px; background: var(--panel2); border: 1px solid transparent; }
.sys.on { border-color: color-mix(in srgb, var(--dot) 55%, transparent); }
.sys-head { display: grid; grid-template-columns: 52px 1fr auto; gap: 10px; align-items: center; padding: 6px; }
.sys-thumb { width: 52px; height: 52px; border-radius: 6px; background: #0b0f14 center/contain no-repeat; border: 1px solid var(--line); }
.sys-name { text-align: left; background: none; border: 0; padding: 0; line-height: 1.25; }
.sys-name b { display: block; font-weight: 600; }
.sys-name small { color: var(--muted); }
.sys-controls { display: flex; gap: 6px; }
.eye, .listen-ico { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line); background: var(--panel);
  display: grid; place-items: center; color: var(--muted); }
.sys.on .eye { background: var(--dot); border-color: var(--dot); color: #0b0f14; }
.listen-ico:hover { border-color: var(--accent); color: var(--text); }
.listen-ico.speaking { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); animation: speak-pulse 1.1s ease-in-out infinite; }
.sys-prog { height: 2px; background: var(--dot); transform-origin: left; transform: scaleX(0); transition: transform .2s; }
.tree { padding: 2px 4px 8px 8px; }
.tree ul { margin-left: 10px; border-left: 1px solid var(--line); padding-left: 4px; }
.row { display: flex; align-items: center; gap: 6px; width: 100%; text-align: left; background: none; border: 0;
  padding: 4px 6px; border-radius: 5px; color: var(--text); }
.row:hover { background: var(--line); }
.row.sel { background: color-mix(in srgb, var(--accent) 22%, transparent); }
.row .chev { width: 12px; color: var(--muted); transition: transform .12s; flex: none; text-align: center; }
.row.open > .chev { transform: rotate(90deg); }
.row .n { color: var(--muted); font-size: 12px; margin-left: auto; padding-left: 8px; }
.row.leaf { color: color-mix(in srgb, var(--text) 88%, var(--muted)); }
.row.leaf .chev { visibility: hidden; }
.side-tag { font-size: 10px; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; margin-left: 4px; }

#results .count { color: var(--muted); font-size: 12px; margin: 0 8px 8px; display: flex; justify-content: space-between; align-items: center; }
.res { display: block; width: 100%; text-align: left; background: none; border: 0; padding: 7px 8px; border-radius: 6px; }
.res:hover { background: var(--line); }
.res .t { display: flex; gap: 8px; align-items: center; }
.res .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--dot); flex: none; }
.res .p { color: var(--muted); font-size: 12px; margin-left: 16px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.res .pin { color: var(--warn); font-size: 11px; margin-left: 4px; }
.more { margin: 8px; }
.btn { background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 5px 10px; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn.listen { display: inline-flex; align-items: center; gap: 6px; }
.btn.listen .ico { display: inline-flex; }
.btn.listen.speaking { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.listen.speaking .ico { animation: speak-pulse 1.1s ease-in-out infinite; }
@keyframes speak-pulse { 0%, 100% { opacity: 1; } 50% { opacity: .55; } }

/* playback controls (pause/resume, speed, loop, favorite) for the active Fish Audio Listen playback —
   inserted right after whichever Listen button/icon started it; see showPlayerStrip() in app.js */
.listen-controls { display: inline-flex; align-items: center; gap: 2px; margin: 4px 0 0 4px;
  padding: 3px 8px 3px 3px; background: var(--panel2); border: 1px solid var(--line); border-radius: 99px;
  vertical-align: middle; }
.listen-controls[hidden] { display: none; }
.pc-btn { width: 26px; height: 26px; border-radius: 50%; border: 1px solid transparent; background: none;
  display: grid; place-items: center; color: var(--muted); padding: 0; flex: none; }
.pc-btn:hover { color: var(--text); background: var(--line); }
.pc-btn.pc-play { color: var(--text); }
.pc-btn.pc-loop[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.pc-btn.pc-fav.on { color: var(--warn); }
.pc-speedwrap { display: inline-flex; align-items: center; gap: 5px; padding: 0 5px; }
.pc-speed { width: 64px; accent-color: var(--accent); }
.pc-speed-lbl { font-size: 11px; color: var(--muted); width: 30px; text-align: right; font-variant-numeric: tabular-nums; }

/* favorites: the star toggle next to search, and the list it swaps into #results */
.fav-toggle { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line); background: var(--panel2);
  display: grid; place-items: center; color: var(--muted); position: absolute; right: 0; top: 0; }
.fav-toggle:hover { border-color: var(--accent); color: var(--text); }
.fav-toggle.on { background: var(--warn); border-color: var(--warn); color: #2a1a00; }
.search { padding-right: 42px; }
.fav-row { display: flex; align-items: center; gap: 2px; }
.fav-row .res { flex: 1; min-width: 0; }
.fav-row .x { flex: none; background: none; border: 0; color: var(--muted); font-size: 16px; line-height: 1;
  padding: 2px 8px; border-radius: 4px; }
.fav-row .x:hover { color: var(--warn); background: var(--line); }

.multi-list { display: flex; flex-direction: column; gap: 4px; margin: 10px 0; }
.multi-item { display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 6px; background: var(--panel2); border: 1px solid var(--line); }
.multi-item .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--dot); flex: none; }
.multi-item .nm { flex: 1; }
.multi-item .sysname { color: var(--muted); font-size: 11px; }
.multi-item .x { flex: none; background: none; border: 0; color: var(--muted); font-size: 16px; line-height: 1; padding: 2px 4px; border-radius: 4px; }
.multi-item .x:hover { color: var(--warn); background: var(--line); }

#stage { grid-area: stage; position: relative; min-width: 0; min-height: 0;
  background: radial-gradient(120% 90% at 50% 20%, #1a2331 0%, #0b0f15 70%); }
#gl { position: absolute; inset: 0; width: 100%; height: 100%; display: block; outline: none; touch-action: none; }
#tip { position: absolute; pointer-events: none; background: rgba(10,14,20,.92); border: 1px solid var(--line);
  padding: 3px 8px; border-radius: 5px; font-size: 12px; transform: translate(12px, 12px); white-space: nowrap; }
#hint { position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); color: var(--muted); font-size: 12px;
  background: rgba(10,14,20,.7); padding: 4px 12px; border-radius: 99px; pointer-events: none; transition: opacity .6s; }
#hint.hide { opacity: 0; }
.toolbar { position: absolute; top: 12px; left: 12px; display: flex; gap: 6px; }
.toolbar button { background: rgba(20,26,35,.88); border: 1px solid var(--line); border-radius: 6px; padding: 5px 10px; backdrop-filter: blur(4px); }
.toolbar button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
#loading { position: absolute; left: 50%; top: 14px; transform: translateX(-50%); background: rgba(10,14,20,.9);
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 14px; min-width: 220px; text-align: center; font-size: 12px; }
#loading .bar { height: 3px; background: var(--line); border-radius: 2px; margin-bottom: 6px; overflow: hidden; }
#loading .bar i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .15s; }

#info { grid-area: info; background: var(--panel); border-left: 1px solid var(--line); overflow: auto; padding: 16px; min-height: 0; }
#info h2 { margin: 0 0 4px; font-size: 20px; line-height: 1.2; }
#info h3 { font-size: 11px; text-transform: uppercase; letter-spacing: .8px; color: var(--muted); margin: 18px 0 6px; }
#info .latin { color: var(--muted); font-style: italic; margin-bottom: 6px; }
#info .crumbs { color: var(--muted); font-size: 12px; margin: 6px 0 10px; }
#info .crumbs button { background: none; border: 0; color: var(--accent); padding: 0; }
.pills { display: flex; flex-wrap: wrap; gap: 5px; margin: 6px 0; }
.pill { font-size: 11px; padding: 2px 8px; border-radius: 99px; background: var(--panel2); border: 1px solid var(--line); color: var(--muted); }
.pill.sys { color: #0b0f14; background: var(--dot); border-color: var(--dot); font-weight: 600; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; margin: 12px 0; }
.desc h4 { margin: 14px 0 4px; font-size: 14px; }
.desc h5 { margin: 10px 0 2px; font-size: 13px; color: var(--muted); }
.desc p { margin: 0 0 8px; }
.empty p { color: var(--muted); }
.fine { font-size: 12px; }
.lm-list { display: flex; flex-wrap: wrap; gap: 5px; }
.lm-list button { font-size: 12px; background: var(--panel2); border: 1px solid var(--line); border-radius: 5px; padding: 2px 7px; }
.lm-list button:hover { border-color: var(--warn); }

/* export panel: download the current selection as a PNG or a multi-page PDF */
.export { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); }
.export h3 { margin-top: 0; }
.exp-row { display: flex; align-items: center; gap: 10px; margin: 8px 0; flex-wrap: wrap; }
.exp-row[hidden] { display: none; }
.exp-row.col { align-items: flex-start; flex-direction: column; gap: 6px; }
.exp-label { font-size: 11px; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); font-weight: 600; min-width: 62px; }
.exp-row.check { display: flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--muted); cursor: pointer; }
.exp-go { margin-top: 10px; width: 100%; font-weight: 600; }
.exp-go:disabled { opacity: .6; cursor: default; }

/* stage overlay for labels / pins that follow 3D points; children opt in to pointer events */
#overlay { position: absolute; inset: 0; pointer-events: none; overflow: hidden; z-index: 3; }
.mode-btn { background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 5px 12px; font-weight: 600; }
.mode-btn:hover { border-color: var(--accent); }
.mode-btn[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* info panel tabs */
.tabs { display: flex; gap: 2px; margin: 14px -4px 0; border-bottom: 1px solid var(--line); }
.tab { background: none; border: 0; border-bottom: 2px solid transparent; padding: 7px 12px; color: var(--muted); font-weight: 600; margin-bottom: -1px; }
.tab:hover { color: var(--text); }
.tab.on { color: var(--text); border-bottom-color: var(--accent); }
.tabpanel { padding-top: 4px; }

/* concise muscle facts: origin / insertion / action / nerve */
.facts { margin: 12px 0 4px; display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.frow { display: grid; grid-template-columns: 102px 1fr; background: var(--panel); }
.frow dt { display: flex; align-items: flex-start; gap: 7px; padding: 8px 8px 8px 10px; background: var(--panel2); color: var(--muted);
  font-size: 11px; text-transform: uppercase; letter-spacing: .4px; font-weight: 600; white-space: nowrap; }
.frow dt b { display: grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; background: var(--dot, var(--accent)); color: #0b0f14; font-size: 10px; flex: none; }
.frow dd { margin: 0; padding: 7px 10px; line-height: 1.35; min-width: 0; }
.frow .fv { display: block; }
.frow .fv + .fv { margin-top: 2px; padding-top: 2px; border-top: 1px dashed var(--line); }
.frow .none { color: var(--muted); font-style: italic; }
.chips { display: flex; flex-wrap: wrap; gap: 5px; }
.chip { font-size: 12px; background: none; border: 1px solid var(--accent); color: var(--accent); border-radius: 99px; padding: 2px 10px 2px 8px; }
.chip i { font-style: normal; font-size: 9px; margin-right: 5px; }
.chip.prime { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.chip:hover { filter: brightness(1.12); }

/* study mode: the quiz panel replaces the sidebar and the info panel */
#study { grid-area: info; display: none; background: var(--panel); border-left: 1px solid var(--line); overflow: auto; min-height: 0; }
body.study-open #app { grid-template-columns: 1fr minmax(360px, 30vw); grid-template-areas: "top top" "stage info"; }
body.study-open #sidebar, body.study-open #info { display: none; }
body.study-open #study { display: block; }
body.study-open #study[hidden] { display: none; }

@media (max-width: 1100px) { :root { --sidebar: 300px; --info: 300px; } }
@media (max-width: 860px) {
  #app { grid-template-columns: 1fr; grid-template-rows: var(--top) 1fr 42vh; grid-template-areas: "top" "stage" "info"; }
  .icon-btn { display: block; }
  #sidebar { position: fixed; z-index: 20; top: var(--top); bottom: 0; left: 0; width: min(88vw, 360px); transform: translateX(-100%);
    transition: transform .2s; box-shadow: 0 0 40px rgba(0,0,0,.5); }
  body.nav-open #sidebar { transform: none; }
  .views button:nth-child(n+3):not([data-view="fit"]) { display: none; }
  #hint { display: none; }
  #info, #study { border-left: 0; border-top: 1px solid var(--line); }
  body.study-open #app { grid-template-columns: 1fr; grid-template-rows: var(--top) 1fr 52vh; grid-template-areas: "top" "stage" "info"; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }