* { box-sizing: border-box; }
:root {
  --bg: hsl(0, 1%, 43%);
  --panel: #333232;
  --panel2: #333232;
  --text: #eef3ff;
  --muted: #c5cad4;
  --line: #4b4d51;
  --accent: #cf3a3a;
  --accent2: #8d7cff;
  --good: #71d6a4;
}
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
  background: radial-gradient(circle at top right, #202021 0, var(--bg) 38%);
  color: var(--text);
}
button, input { font: inherit; }
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px 28px; border-bottom: 1px solid var(--line);
  background: rgba(25, 25, 27, 0.88); position: sticky; top: 0; z-index: 10;
}
.topbar h1 { margin: 0 0 4px; font-size: 24px; }
.topbar p { margin: 0; color: var(--muted); font-size: 13px; }
.app { display: grid; grid-template-columns: 330px 1fr; gap: 18px; padding: 18px; max-width: 1700px; margin: 0 auto; }
.sidebar { display: flex; flex-direction: column; gap: 18px; }
.content { display: flex; flex-direction: column; gap: 18px; }
.card {
  background: rgba(25, 25, 27, 0.88);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 14px 35px rgba(0,0,0,.18);
}
.controls, .audio-card, .notes { padding: 16px; }
.card h2 { margin: 0; font-size: 16px; }
.section-heading { display:flex; justify-content:space-between; align-items:flex-start; gap:12px; margin-bottom:12px; }
.hint { color: var(--muted); font-size: 12px; }
.control-row { margin: 14px 0 16px; }
.control-label { display:flex; justify-content:space-between; gap:10px; font-size: 13px; margin-bottom: 7px; }
.control-label span:first-child { color: #dce5fb; }
.value { color: var(--accent); font-variant-numeric: tabular-nums; }
input[type="range"] { width:100%; accent-color:var(--accent); }
.check-row { display:flex; align-items:center; gap:9px; margin-top: 12px; color:#dce5fb; font-size:13px; }
button {
  border: 0; border-radius: 9px; padding: 9px 12px; cursor:pointer;
  color:#08101e; background:var(--accent); font-weight:650;
}
button.secondary { background:#4b4d51; color:var(--text); }
.button-row { display:grid; grid-template-columns:1fr 1fr; gap:8px; margin-top:10px; }
input[type="file"] { width:100%; color:var(--muted); }
.status { color:var(--muted); font-size:12px; margin-top:9px; min-height: 16px; }
.notes p { color:var(--muted); font-size:12px; line-height:1.45; }
.hero-grid { display:grid; grid-template-columns: 1.35fr .65fr; gap:18px; }
.viewer-card { min-height: 430px; padding: 14px; }
.summary-card { padding: 14px; }
#sceneWrap { position:relative; height:370px; border-radius:10px; overflow:hidden; background:linear-gradient(180deg,#0b1329,#08101f); }
#scene { width:100%; height:100%; display:block; }
.legend {
  position:absolute; left:12px; bottom:10px; display:flex; gap:12px;
  padding:7px 9px; border-radius:8px; background:rgba(6,11,24,.72); color:#d9e3f8; font-size:11px;
}
.dot { width:9px; height:9px; display:inline-block; border-radius:50%; margin-right:4px; }
.dot.source{background:#ff6b6b}.dot.ray{background:#ffd166}.dot.canal{background:#6ea8fe}
.summary-grid { display:grid; grid-template-columns:1fr 1fr; gap:9px; }
.metric { background:var(--panel2); border:1px solid var(--line); border-radius:10px; padding:10px; }
.metric .k { color:var(--muted); font-size:11px; }
.metric .v { font-size:16px; margin-top:4px; font-variant-numeric: tabular-nums; }
.chart-card { padding: 14px; }
.chart-card canvas { width:100%; height:300px; display:block; }
.features-card { padding:14px; }
.feature-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:10px; }
.feature {
  background:var(--panel2); border:1px solid var(--line); border-radius:10px; padding:10px;
}
.feature .k { color:var(--muted); font-size:11px; }
.feature .v { margin-top:5px; font-size:14px; font-variant-numeric: tabular-nums; }
@media (max-width: 1050px) {
  .app { grid-template-columns:1fr; }
  .hero-grid { grid-template-columns:1fr; }
  .feature-grid { grid-template-columns:repeat(2,1fr); }
}

/* Spectrogram styling */
#sceneWrap {
  background: #000;
}
#scene {
  image-rendering: auto;
}

/* --------------------------- Model navigation --------------------------- */
.model-view { display: none; }
.model-view.active-view { display: contents; }

.brand { min-width: 220px; }
.model-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}
.nav-btn {
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
  padding: 8px 11px;
  border-radius: 9px;
  font-weight: 650;
}
.nav-btn:hover { background: rgba(255,255,255,.06); color: var(--text); }
.nav-btn.active {
  background: rgba(207,58,58,.16);
  border-color: rgba(207,58,58,.55);
  color: #fff;
}

/* --------------------------- Future model views --------------------------- */
.placeholder-view { gap: 18px; }
.placeholder-layout,
.combined-layout { display: grid; gap: 18px; }
.placeholder-layout { grid-template-columns: 1.6fr .8fr; }
.placeholder-hero,
.roadmap-card,
.combined-hero,
.signal-contract { padding: 24px; }
.placeholder-hero h2,
.combined-hero h2 { margin: 6px 0 8px; font-size: 28px; }
.placeholder-hero > p,
.combined-hero p { color: var(--muted); line-height: 1.55; }
.eyebrow {
  display: inline-block;
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .14em;
}
.pipeline-card {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 10px;
  margin: 24px 0;
  padding: 16px;
  background: rgba(0,0,0,.16);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.pipeline-node {
  min-height: 100px;
  padding: 14px;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--panel2);
}
.pipeline-node.complete { border-color: rgba(113,214,164,.45); }
.pipeline-node.planned { border-style: dashed; }
.pipeline-node span,
.stage-number {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--line);
  font-size: 11px;
  margin-bottom: 8px;
}
.pipeline-node strong,
.pipeline-node small { display: block; }
.pipeline-node strong { font-size: 14px; }
.pipeline-node small { color: var(--muted); font-size: 11px; margin-top: 5px; }
.pipeline-arrow { color: var(--muted); font-size: 18px; text-align: center; }
.architecture-note { font-size: 13px; }
.roadmap-card h3,
.signal-contract h3 { margin-top: 0; }
.roadmap-card ul { margin: 16px 0 20px; padding-left: 20px; color: var(--muted); line-height: 1.8; }
.status-pill {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 11px;
}

/* --------------------------- Combined view --------------------------- */
.chain {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: stretch;
  gap: 12px;
  margin-top: 22px;
}
.chain-stage {
  padding: 18px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel2);
  min-height: 190px;
}
.chain-stage.active { border-color: rgba(113,214,164,.5); }
.chain-stage.planned { border-style: dashed; }
.chain-stage h3 { margin: 0 0 4px; }
.chain-stage p { color: var(--accent); font-size: 12px; font-weight: 700; margin: 0 0 10px; }
.chain-stage small { color: var(--muted); display: block; line-height: 1.45; min-height: 42px; }
.chain-connector {
  align-self: center;
  color: var(--muted);
  font-size: 20px;
  text-align: center;
  white-space: nowrap;
}
.chain-connector span { display: block; font-size: 9px; margin-bottom: 3px; }
.text-btn {
  margin-top: 14px;
  padding: 0;
  background: transparent;
  color: #b9cdf7;
  font-size: 12px;
}
.text-btn:hover { color: #fff; text-decoration: underline; }
.signal-contract { background: rgba(25,25,27,.88); }
.contract-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.contract-row:last-of-type { border-bottom: 0; }
.contract-row code {
  color: #dce5fb;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}
.signal-contract .architecture-note { margin-bottom: 0; color: var(--muted); line-height: 1.5; }

@media (max-width: 1100px) {
  .topbar { flex-wrap: wrap; gap: 12px; }
  .model-nav { order: 3; width: 100%; }
  .placeholder-layout { grid-template-columns: 1fr; }
  .chain { grid-template-columns: 1fr; }
  .chain-connector { transform: rotate(90deg); height: 32px; }
  .chain-connector span { transform: rotate(-90deg); }
}
@media (max-width: 700px) {
  .pipeline-card { grid-template-columns: 1fr; }
  .pipeline-arrow { transform: rotate(90deg); height: 26px; }
  .pipeline-arrow span { transform: rotate(-90deg); }
  .top-actions { margin-left: auto; }
}


/* --------------------------- Middle ear view --------------------------- */
.control-note { color:var(--muted); font-size:11px; line-height:1.5; margin:14px 0 0; }
.middle-summary-card { padding:14px; }
#view-middle code { color:#dce5fb; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:11px; }
#view-middle .content { min-width:0; }
#view-middle .chart-card canvas { height:300px; }
@media (max-width: 1050px) {
  #view-middle.model-view.active-view { display:contents; }
}

/* --------------------------- Combined outer + middle response --------------------------- */
#view-combined .equation-note { padding:10px 12px; border:1px solid var(--line); border-radius:9px; background:rgba(0,0,0,.16); }
#view-combined code { color:#dce5fb; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:11px; }
#view-combined .assumption-card p { line-height:1.55; }
#view-combined .content { min-width:0; }
#view-combined .chart-card canvas { height:300px; }
@media (min-width: 1051px) {
  #view-combined.model-view.active-view { display:contents; }
}

/* --------------------------- Middle / combined audio spectrograms --------------------------- */
.model-audio-viewer { min-height: 410px; }
.model-spectrogram-wrap {
  height: 350px;
  border-radius: 10px;
  overflow: hidden;
  background: #000;
}
.model-spectrogram-wrap canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.white-noise-btn { width:100%; margin-top:8px; }
.top-actions { display:flex; align-items:center; gap:8px; }

.collapsible-chart > summary { cursor:pointer; }
.collapsible-chart > summary h2 { display:inline; }
.collapsible-chart > summary::marker { color:var(--muted); }
.collapsible-chart > summary:focus-visible { outline:2px solid var(--accent); outline-offset:5px; border-radius:3px; }
.collapsible-chart[open] > summary { margin-bottom:12px; }

/* --------------------------- Shared parameter drawer --------------------------- */
.app { display:block; max-width:1700px; }
.model-view.active-view,
#view-middle.model-view.active-view,
#view-combined.model-view.active-view,
#view-inner.model-view.active-view { display:block !important; }
.model-view.active-view > .sidebar {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:18px;
  margin-bottom:18px;
}
.model-view.active-view > .content { width:100%; }
.model-view.active-view > .sidebar .card { height:100%; }
.parameter-drawer-backdrop {
  position:fixed;
  inset:0;
  z-index:30;
  background:rgba(4,7,13,.56);
  backdrop-filter:blur(2px);
}
.parameter-drawer {
  position:fixed;
  z-index:31;
  top:0;
  left:0;
  width:min(390px,92vw);
  height:100dvh;
  overflow-y:auto;
  padding:18px;
  background:linear-gradient(160deg,#252526,#171719 68%);
  border-right:1px solid var(--line);
  box-shadow:20px 0 50px rgba(0,0,0,.38);
  transform:translateX(-104%);
  transition:transform .24s ease;
}
.parameter-drawer-open .parameter-drawer { transform:translateX(0); }
.parameter-drawer-open { overflow:hidden; }
.drawer-header { display:flex; align-items:flex-start; justify-content:space-between; gap:12px; margin-bottom:14px; }
.drawer-header h2 { margin:4px 0 0; font-size:22px; }
.drawer-close { padding:7px 10px; }
.drawer-section { border-top:1px solid var(--line); padding:14px 0 4px; }
.drawer-section summary { cursor:pointer; color:#dce5fb; font-size:14px; font-weight:750; }
.drawer-section[open] summary { margin-bottom:2px; }
.drawer-section .control-note { margin:8px 0 4px; }
.drawer-section button { width:100%; margin-top:8px; }
.drawer-section #simulateEarInfectionBtn { background:#cf3a3a; color:#08101e; }

@media (max-width:700px) {
  .app { padding:12px; }
  .model-view.active-view > .sidebar { grid-template-columns:1fr; gap:12px; margin-bottom:12px; }
  .parameter-drawer { width:min(390px,96vw); padding:14px; }
}

/* --------------------------- Synthetic HRIR renderer --------------------------- */
#view-inner .content { min-width:0; }
#view-inner .chart-card canvas { height:300px; }
#view-inner .hrir-summary-card { padding:14px; }
#view-inner code { color:#dce5fb; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:11px; }
@media (min-width: 1051px) {
  #view-inner.model-view.active-view { display:contents; }
}