:root {
  --bg: #0b0d10;
  --panel: #14181d;
  --border: #252b33;
  --text: #d8dee6;
  --muted: #7d8896;
  --accent: #39b6ff;
  --ok: #3ccf7a;
  --bad: #ff5d5d;
  color-scheme: dark;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 system-ui, sans-serif;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 1.1rem; margin: 0; }
.level select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.2rem 0.4rem;
}
.status { margin-left: auto; color: var(--muted); }
.status.ok { color: var(--ok); }
.status.bad { color: var(--bad); }

.layout {
  display: grid;
  grid-template-columns: 260px 1fr 1fr;
  gap: 1px;
  background: var(--border);
  min-height: 0;
}
.layout > * { background: var(--bg); min-height: 0; }

.views { overflow: auto; padding: 0.5rem 1rem; }
.views h2 { font-size: 0.9rem; color: var(--muted); text-transform: uppercase; }
.views ol { padding-left: 1.6rem; margin: 0; }
.views li { padding: 0.05rem 0; }
.views li::marker { color: var(--muted); }
.views li button {
  background: none;
  border: 0;
  color: var(--text);
  font: inherit;
  text-align: left;
  padding: 0.1rem 0.2rem;
  cursor: pointer;
  border-radius: 3px;
}
.views li button:hover { background: var(--panel); }
.views li.selected button { color: var(--accent); }
.views li.has-target button::after { content: " ●"; color: var(--ok); font-size: 0.7em; }
.muted { color: var(--muted); font-size: 0.85em; }

.target { margin-top: 1rem; border-top: 1px solid var(--border); padding-top: 0.5rem; }
.target h3 { font-size: 0.95rem; margin: 0 0 0.2rem; }
.buttons { display: flex; gap: 0.4rem; flex-wrap: wrap; margin: 0.4rem 0; }
button { font: inherit; }
.buttons button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
}
.buttons button:hover:not(:disabled) { border-color: var(--accent); }
.buttons button:disabled { opacity: 0.4; cursor: default; }
.keys { margin-top: 1rem; color: var(--muted); font-size: 0.85em; }
.keys summary { cursor: pointer; }
.keys dl { display: grid; grid-template-columns: auto 1fr; gap: 0.1rem 0.6rem; margin: 0.4rem 0; }
.keys dt { color: var(--text); }
.keys dd { margin: 0; }

.echo-panel { display: flex; flex-direction: column; }
.echo-stage { position: relative; flex: 1; min-height: 200px; }
.echo-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hud { position: absolute; font-size: 0.8rem; color: #c8d2dc; pointer-events: none; }
.hud.top-left { top: 0.4rem; left: 0.6rem; }
.hud.top-right { top: 0.4rem; right: 4.2rem; }
.hud.bottom-left { bottom: 0.4rem; left: 0.6rem; color: var(--accent); }

.spectral-stage { position: relative; flex: 0 0 32%; min-height: 140px; border-top: 1px solid var(--border); }
.panel .spectral-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.measure { margin-top: 1rem; border-top: 1px solid var(--border); padding-top: 0.3rem; }
.measure .buttons button.active { border-color: var(--accent); color: var(--accent); }
.measure-list { padding-left: 1.4rem; margin: 0.3rem 0; font-size: 0.85em; }
.measure-list li { padding: 0.1rem 0; }

.cine { border-top: 1px solid var(--border); padding: 0.2rem 0.6rem; }
.panel .cine canvas#ecg { display: block; width: 100%; height: 44px; } /* beats .panel canvas */
/* A visible strip draws its own ECG, locked to its columns and sweep: one trace, not two. */
body:not([data-layout="3d"]) .echo-panel:has(.spectral-stage:not([hidden])) .cine canvas#ecg { display: none; }
#spectral-rate { color: #c8d2dc; font-size: 11px; } /* over the strip's ECG */
.cine-controls { display: flex; align-items: center; gap: 0.6rem; font-size: 0.8rem; }
.cine-controls button {
  background: var(--panel); color: var(--text); border: 1px solid var(--border);
  border-radius: 3px; width: 2rem; cursor: pointer;
}
.cine-controls #cine-scrub { flex: 1; accent-color: var(--accent); }
.cine-controls .hr { display: flex; align-items: center; gap: 0.3rem; }
.cine-controls .hr input { width: 7rem; accent-color: var(--accent); }
.cine-controls select { background: var(--panel); color: var(--text); border: 1px solid var(--border); font: inherit; }

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  max-height: 30vh; /* scroll rather than squeeze the image */
  overflow-y: auto;
  flex: none;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
}
.controls fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
.controls legend { color: var(--muted); text-transform: uppercase; font-size: 0.7rem; padding: 0; }
.ctl { display: grid; grid-template-columns: 5.6rem 1fr 3.2rem; align-items: center; gap: 0.4rem; }
.ctl input { width: 100%; accent-color: var(--accent); }
.ctl output { text-align: right; font-variant-numeric: tabular-nums; }
.check { display: block; padding: 0.15rem 0; }
.ctl select { background: var(--panel); color: var(--text); border: 1px solid var(--border); font: inherit; }
.tgc { display: flex; justify-content: space-between; height: 4.2rem; margin-top: 0.3rem; }
.tgc input { writing-mode: vertical-lr; direction: rtl; width: 1rem; height: 100%; accent-color: var(--accent); }

.panel { position: relative; }
.panel canvas { display: block; width: 100%; height: 100%; }
.placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  color: var(--muted);
  pointer-events: none;
}

.overlay {
  position: absolute;
  background: rgb(20 24 29 / 0.85);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3rem;
  font-size: 0.8rem;
}
.overlay.top-left { top: 0.5rem; left: 0.5rem; display: flex; gap: 0.25rem; flex-wrap: wrap; }
.overlay.top-right { top: 0.5rem; right: 0.5rem; max-height: calc(100% - 1rem); overflow: auto; }
.overlay button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.15rem 0.45rem;
  cursor: pointer;
  text-transform: capitalize;
}
.overlay button:hover { border-color: var(--accent); }
.overlay summary { cursor: pointer; padding: 0 0.2rem; }
.overlay fieldset { border: 0; margin: 0.3rem 0 0; padding: 0; }
.overlay legend { color: var(--muted); padding: 0; font-size: 0.75rem; text-transform: uppercase; }
.overlay label { display: block; white-space: nowrap; padding: 0.05rem 0.2rem; }

.footer {
  padding: 0.3rem 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
}

.fatal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--bg);
  font-size: 1.1rem;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; grid-auto-rows: minmax(300px, auto); }
  .echo-stage { min-height: 320px; }
  .controls { grid-template-columns: 1fr; }
}

/* Accounts */
.account { display: flex; align-items: center; gap: 0.5rem; }
.account button, dialog button, .snapshot-form button, .snapshot-list button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.2rem 0.6rem;
  cursor: pointer;
}
dialog {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  width: min(26rem, 92vw);
}
dialog::backdrop { background: rgb(0 0 0 / 0.6); }
dialog h2 { margin-top: 0; font-size: 1.1rem; }
dialog label { display: grid; gap: 0.2rem; margin: 0.5rem 0; }
dialog input, .snapshot-form input {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.3rem 0.4rem;
  font: inherit;
}
.error { color: var(--bad); min-height: 1.2em; margin: 0.3rem 0; }

/* View training */
.desc { font-size: 0.85em; margin: 0.3rem 0; }
.match { display: flex; align-items: center; gap: 0.5rem; }
.match meter { flex: 1; height: 0.8rem; }
.match .good { color: var(--ok); }
.hints { margin: 0.3rem 0; padding-left: 1.2rem; color: var(--accent); }
.result { font-size: 0.9em; }
.timer { align-self: center; font-variant-numeric: tabular-nums; color: var(--accent); }
.views li .score { color: var(--muted); font-size: 0.8em; margin-left: 0.3rem; }

/* Measurement labels and calculations */
.measure-as { display: flex; gap: 0.4rem; align-items: center; font-size: 0.85em; color: var(--muted); }
.measure-as select { flex: 1; min-width: 0; }
.measure-calcs { list-style: none; padding: 0.3rem 0 0; margin: 0.3rem 0 0; border-top: 1px dashed var(--border); font-size: 0.9em; }
.measure-calcs li { padding: 0.05rem 0; cursor: help; }

/* Case library */
.case { margin-bottom: 0.8rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.case select { width: 100%; }
.case-info summary { cursor: pointer; color: var(--muted); font-size: 0.85em; margin-top: 0.3rem; }
.case-lesions { padding-left: 1rem; margin: 0.3rem 0; }
.case-lesions p { margin: 0.1rem 0 0.4rem; }
.key-findings { display: grid; grid-template-columns: auto 1fr; gap: 0.05rem 0.5rem; margin: 0 0 0.5rem; font-size: 0.85em; }
.key-findings dt { color: var(--muted); }
.key-findings dd { margin: 0; }
.case-reference { border-collapse: collapse; font-size: 0.85em; width: 100%; }
.case-reference caption { text-align: left; }
.case-reference th { text-align: left; font-weight: normal; color: var(--muted); padding: 0.05rem 0.4rem 0.05rem 0; }
.case-reference td { text-align: right; white-space: nowrap; }
.case-reference th.group { color: var(--text); font-weight: 600; padding-top: 0.4rem; }

/* Case editor (instructors) and case quiz */
.case-editor summary { cursor: pointer; color: var(--muted); font-size: 0.85em; margin-top: 0.3rem; }
.case-editor .field, .case-editor .param { display: flex; flex-direction: column; gap: 0.1rem; font-size: 0.85em; color: var(--muted); margin: 0.3rem 0; }
.case-editor input, .case-editor textarea, .case-editor select { width: 100%; box-sizing: border-box; }
.lesion-edit { list-style: none; padding: 0; margin: 0.3rem 0; }
.lesion-edit > li { border: 1px solid var(--border); border-radius: 4px; padding: 0.3rem; margin-bottom: 0.3rem; }
.lesion-head { display: flex; flex-wrap: wrap; gap: 0.3rem; align-items: center; }
.lesion-head strong { flex: 1 1 100%; font-size: 0.9em; }
.lesion-head select { flex: 1; width: auto; min-width: 0; }
.lesion-head button.icon { background: none; border: 1px solid var(--border); color: var(--muted); border-radius: 4px; cursor: pointer; }
.lesion-edit summary { cursor: pointer; font-size: 0.8em; color: var(--muted); }
.quiz h3 { margin: 0.5rem 0 0.2rem; }
.quiz-form { list-style: none; padding: 0; margin: 0.3rem 0; font-size: 0.9em; }
.quiz-row { display: flex; flex-wrap: wrap; gap: 0.3rem; align-items: center; padding: 0.1rem 0; }
.quiz-row label { flex: 1 1 100%; }
.quiz-row select { flex: 1; min-width: 0; }
.quiz-result { border-collapse: collapse; font-size: 0.85em; width: 100%; }
.quiz-result th, .quiz-result td { text-align: left; padding: 0.05rem 0.3rem 0.05rem 0; }
.quiz-result .verdict.correct { color: var(--ok); }
.quiz-result .look-for td { font-size: 0.9em; padding-bottom: 0.3rem; }
.quiz-result .verdict.missed, .quiz-result .verdict.not-present { color: var(--bad); }

/* Snapshots */
.snapshots { margin-top: 1rem; border-top: 1px solid var(--border); padding-top: 0.5rem; }
.snapshot-form { display: flex; gap: 0.4rem; }
.snapshot-form input { flex: 1; min-width: 0; }
.snapshot-list { padding-left: 0; list-style: none; }
.snapshot-list li { display: flex; gap: 0.3rem; margin: 0.2rem 0; }
.snapshot-list li button:first-child { flex: 1; text-align: left; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.snapshot-list .icon { padding: 0.2rem 0.5rem; }
.bench { font-size: 0.8rem; white-space: pre; overflow-x: auto; }
#bench-dialog { width: min(46rem, 94vw); }

/* Keyboard focus (dark theme) */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
input[type=range]:focus-visible { outline-offset: 0; }
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}

/* Clinical review */
dialog.wide { width: min(70rem, 96vw); }
dialog select, dialog textarea {
  background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 3px; font: inherit; padding: 0.2rem;
}
.review-shot { max-width: 100%; max-height: 40vh; display: block; border: 1px solid var(--border); }
.table-wrap { max-height: 65vh; overflow: auto; }
table.reviews { border-collapse: collapse; width: 100%; font-size: 0.85rem; }
table.reviews th, table.reviews td { border-bottom: 1px solid var(--border); padding: 0.3rem; text-align: left; vertical-align: top; }
table.reviews .comment { white-space: pre-wrap; max-width: 28rem; }
table.reviews .thumb { width: 120px; cursor: zoom-in; }

/* Layouts (FR-3D3): body[data-layout] */
body[data-layout="2d"] .layout { grid-template-columns: 260px 1fr; }
body[data-layout="2d"] .panel-3d { display: none; }
body[data-layout="3d"] .layout { grid-template-columns: 260px minmax(320px, 26rem) 1fr; }
body[data-layout="3d"] .echo-stage,
body[data-layout="3d"] .spectral-stage { display: none; }
body[data-layout="pip"] .layout { grid-template-columns: 260px 1fr; }
body[data-layout="pip"] .panel-3d {
  position: fixed; right: 1rem; bottom: 3rem; width: min(32vw, 34rem); height: min(36vh, 26rem);
  z-index: 5; border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
  box-shadow: 0 8px 24px rgb(0 0 0 / 0.5);
}