:root {
  --bg: #07111f;
  --bg-deep: #050b14;
  --panel: rgba(11, 22, 39, 0.92);
  --panel-soft: rgba(14, 28, 48, 0.72);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(117, 142, 255, 0.28);
  --text: #e8eef9;
  --muted: #9facc2;
  --muted-strong: #c7d2e5;
  --primary: #7180ff;
  --accent: #38d9ff;
  --success: #47d38c;
  --danger: #ff6b7d;
  --shadow: 0 24px 72px rgba(2, 8, 20, 0.42);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { min-height: 100%; color-scheme: dark; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 8%, rgba(111, 124, 255, 0.15), transparent 25%),
    radial-gradient(circle at 88% 12%, rgba(56, 217, 255, 0.09), transparent 24%),
    linear-gradient(180deg, #060d18, var(--bg));
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
}

a { color: inherit; text-decoration: none; }
button, select, input { font: inherit; }
button { cursor: pointer; }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, canvas:focus-visible, .file-button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.lab-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 76px;
  padding: 12px clamp(18px, 3vw, 42px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: rgba(5, 11, 20, 0.82);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
}

.lab-brand { display: inline-flex; align-items: center; gap: 12px; }
.lab-brand > span:last-child { display: grid; gap: 1px; }
.lab-brand strong { font-size: 1.02rem; letter-spacing: -0.01em; }
.lab-brand small { color: var(--muted); font-size: 0.76rem; }
.lab-mark {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border-radius: 14px;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #4ba7ff);
  box-shadow: 0 12px 28px rgba(76, 116, 255, 0.34);
}
.lab-header nav { display: flex; align-items: center; gap: 24px; }
.lab-header nav a { color: var(--muted-strong); font-weight: 650; }
.lab-header nav a:hover { color: #fff; }

.lab-shell {
  min-height: calc(100vh - 76px);
  display: grid;
  grid-template-columns: minmax(260px, 330px) minmax(0, 1fr);
  align-items: start;
}

.source-panel {
  padding: 28px 24px 36px;
  background: linear-gradient(180deg, rgba(10, 20, 35, 0.94), rgba(7, 15, 27, 0.92));
  border-right: 1px solid var(--border);
}
.panel-heading { margin-bottom: 26px; }
.eyebrow {
  margin: 0 0 7px;
  color: #b8c7ff;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.panel-heading h1, .viewer-toolbar h2 { margin: 0; letter-spacing: -0.025em; }
.panel-heading h1 { font-size: 1.65rem; }
.panel-heading p:last-child, .viewport-position { margin: 8px 0 0; color: var(--muted); }

label, legend { color: var(--muted-strong); font-size: 0.82rem; font-weight: 750; }
select {
  width: 100%;
  min-height: 46px;
  margin: 7px 0 18px;
  padding: 0 38px 0 13px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--border);
  border-radius: 13px;
}
select:disabled { opacity: 0.55; }

.source-summary {
  min-height: 64px;
  margin: 2px 0 22px;
  padding: 14px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border);
  border-radius: 14px;
  font-size: 0.85rem;
}
.source-summary strong { display: block; color: var(--text); margin-bottom: 3px; }
.source-summary.error { color: #ffb3bc; border-color: rgba(255, 107, 125, 0.32); }
.source-summary a { color: #c9d6ff; text-decoration: underline; }

fieldset { min-width: 0; margin: 0 0 22px; padding: 0; border: 0; }
fieldset:disabled { opacity: 0.55; }
.channel-fieldset { position: relative; }
.channel-actions { position: absolute; top: -6px; right: 0; display: flex; gap: 10px; }
.text-button {
  padding: 3px 0;
  color: #bfcaff;
  background: none;
  border: 0;
  font-size: 0.78rem;
  font-weight: 750;
}
.channel-list { display: grid; gap: 7px; margin-top: 10px; max-height: 250px; overflow-y: auto; }
.channel-option {
  min-width: 0;
  padding: 8px 9px;
  display: grid;
  grid-template-columns: auto 10px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
}
.channel-option input { margin: 0; accent-color: var(--primary); }
.channel-color { width: 9px; height: 9px; border-radius: 999px; }
.channel-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text); }
.channel-unit { color: var(--muted); font-size: 0.74rem; }

.overlay-list { display: grid; gap: 7px; margin-top: 10px; }
.overlay-option {
  min-width: 0;
  padding: 7px 9px;
  display: grid;
  grid-template-columns: auto 13px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
  color: var(--muted-strong);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
}
.overlay-option input { margin: 0; accent-color: var(--primary); }
.overlay-symbol { width: 10px; height: 10px; display: block; border: 2px solid #d4a4ff; }
.overlay-r_peak .overlay-symbol { border: 0; background: #4ee4ff; clip-path: polygon(50% 0, 0 100%, 100% 100%); }
.overlay-ecg_fiducial .overlay-symbol { border-color: #ff9fd5; transform: rotate(45deg); }
.overlay-ppg_onset .overlay-symbol { border: 0; background: #64e6ad; transform: rotate(45deg); }
.overlay-ppg_peak .overlay-symbol { border-color: #ffd16f; border-radius: 50%; }
.overlay-artifact .overlay-symbol { width: 13px; background: repeating-linear-gradient(135deg, #ffbf69 0 2px, transparent 2px 4px); border-color: #ffbf69; }
.overlay-episode .overlay-symbol { width: 13px; border-color: #b991ff; border-style: dashed; }
.overlay-low_perfusion .overlay-symbol { border: 0; position: relative; }
.overlay-low_perfusion .overlay-symbol::before,
.overlay-low_perfusion .overlay-symbol::after { content: ""; position: absolute; left: 4px; top: -1px; width: 2px; height: 13px; background: #ff9e62; }
.overlay-low_perfusion .overlay-symbol::before { transform: rotate(45deg); }
.overlay-low_perfusion .overlay-symbol::after { transform: rotate(-45deg); }
.overlay-missing_pulse .overlay-symbol { width: 13px; border-color: #ff759a; border-style: dotted; }
.control-hint { margin: 8px 0 10px; color: var(--muted); font-size: 0.78rem; }
.local-detection-fieldset { position: relative; }
#local-detection-file { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.file-button {
  min-height: 36px;
  margin-right: 10px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  color: #fff;
  background: rgba(113, 128, 255, 0.18);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  cursor: pointer;
}
.file-button:hover { background: rgba(113, 128, 255, 0.27); }
.local-status { margin: 9px 0 0; color: var(--muted); font-size: 0.76rem; }
.local-status.ok { color: #83e9b5; }
.local-status.error { color: #ffabb6; }

.segmented-control {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin-top: 9px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--border);
  border-radius: 13px;
}
.segmented-control button {
  min-height: 38px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 9px;
  font-weight: 750;
}
.segmented-control button.active { color: #fff; background: rgba(113, 128, 255, 0.2); }

.viewer-note { display: grid; gap: 4px; padding: 14px; border-left: 2px solid rgba(56, 217, 255, 0.48); background: rgba(56, 217, 255, 0.045); }
.viewer-note strong { font-size: 0.86rem; }
.viewer-note span { color: var(--muted); font-size: 0.8rem; }

.viewer-stage {
  min-width: 0;
  min-height: 0;
  padding: clamp(18px, 3vw, 38px);
  display: flex;
  flex-direction: column;
}
.viewer-toolbar {
  min-height: 74px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}
.viewer-toolbar h2 { font-size: clamp(1.45rem, 2.4vw, 2.15rem); }
.viewport-position { font-variant-numeric: tabular-nums; }
.toolbar-actions { display: flex; align-items: center; gap: 14px; }
.secondary-button {
  min-height: 40px;
  padding: 0 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 11px;
  font-weight: 700;
}
.request-status { color: var(--muted); font-size: 0.82rem; white-space: nowrap; }
.request-status.loading::before, .request-status.ok::before, .request-status.error::before {
  content: "";
  width: 8px;
  height: 8px;
  display: inline-block;
  margin-right: 7px;
  border-radius: 999px;
  background: var(--accent);
}
.request-status.ok::before { background: var(--success); }
.request-status.error::before { background: var(--danger); }

.canvas-shell {
  position: relative;
  height: max(430px, calc(100vh - 140px));
  height: max(430px, calc(100dvh - 140px));
  min-height: 240px;
  flex: none;
  margin-top: 12px;
  overflow: hidden;
  background:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px),
    #060e1a;
  background-size: 28px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
#signal-canvas { width: 100%; height: 100%; min-height: 240px; display: block; touch-action: none; cursor: grab; }
#signal-canvas.dragging { cursor: grabbing; }
.viewer-empty {
  position: absolute;
  inset: 0;
  display: none;
  place-content: center;
  gap: 5px;
  text-align: center;
  pointer-events: none;
}
.viewer-empty.is-visible { display: grid; }
.viewer-empty strong { font-size: 1.1rem; }
.viewer-empty span { color: var(--muted); }
.viewer-empty[hidden] { display: none !important; }

.vertical-controls {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  display: grid;
  gap: 12px;
}
.vertical-control-group {
  display: grid;
  justify-items: center;
  gap: 6px;
}
.vertical-control-group span {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  color: var(--muted);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.vertical-control-group button,
.time-zoom-controls button {
  display: grid;
  place-items: center;
  color: #fff;
  background: rgba(12, 25, 44, 0.9);
  border: 1px solid var(--border-strong);
  box-shadow: 0 10px 26px rgba(2, 8, 20, 0.35);
  font-size: 1.2rem;
  font-weight: 500;
}
.vertical-control-group button { width: 38px; height: 44px; border-radius: 11px; }
.vertical-control-group button:disabled { cursor: default; opacity: 0.38; }

.timeline-controls {
  margin-top: 16px;
  display: grid;
  grid-template-columns: auto minmax(120px, 1fr) auto;
  align-items: center;
  gap: 14px;
}

.cursor-inspector {
  max-height: 132px;
  margin-top: 10px;
  padding: 10px 13px;
  display: grid;
  gap: 10px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border);
  border-radius: 14px;
  font-size: 0.78rem;
  overflow: auto;
}
.cursor-inspector > div { display: flex; align-items: baseline; gap: 12px; }
.cursor-inspector strong { color: var(--text); }
.cursor-inspector dl { margin: 0; display: grid; grid-template-columns: repeat(4, minmax(80px, auto) minmax(0, 1fr)); gap: 5px 10px; }
.cursor-inspector dt { color: var(--muted-strong); font-weight: 700; }
.cursor-inspector dd { margin: 0; color: var(--text); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.cursor-inspector small { color: var(--muted); font-family: inherit; }
.cursor-inspector ul { margin: 0; padding-left: 18px; display: flex; flex-wrap: wrap; gap: 5px 24px; }
.cursor-inspector li span { color: var(--muted); }
.cursor-inspector p { margin: 0; }
.timeline-controls > label { font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; }
input[type="range"] { width: 100%; accent-color: var(--primary); cursor: ew-resize; }
input[type="range"]:disabled { opacity: 0.45; }
.time-zoom-controls { display: flex; gap: 8px; }
.time-zoom-controls button { width: 64px; height: 34px; border-radius: 9px; }

.viewer-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 2px 0;
  color: var(--muted);
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 980px) {
  .lab-shell { grid-template-columns: 1fr; }
  .source-panel { border-right: 0; border-bottom: 1px solid var(--border); }
  .channel-list { max-height: 180px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cursor-inspector dl { grid-template-columns: repeat(2, minmax(90px, auto) minmax(130px, 1fr)); }
}

@media (max-width: 640px) {
  .lab-header { align-items: flex-start; }
  .lab-header nav { gap: 12px; font-size: 0.82rem; }
  .lab-header nav a:first-child { display: none; }
  .source-panel, .viewer-stage { padding: 20px 15px 26px; }
  .channel-list { grid-template-columns: 1fr; }
  .viewer-toolbar { flex-direction: column; }
  .toolbar-actions { width: 100%; justify-content: space-between; }
  .timeline-controls { grid-template-columns: 1fr auto; }
  .timeline-controls > label { grid-column: 1 / -1; }
  .viewer-footer { flex-direction: column; gap: 5px; }
  .cursor-inspector dl { grid-template-columns: auto minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}