:root {
  --lab-bg: #f5f2ea;
  --lab-surface: #fbf8f1;
  --lab-surface-2: #f1ede4;
  --lab-border: #d8d1c3;
  --lab-text: #221f18;
  --lab-muted: #69645b;
  --lab-accent: #8e6a12;
  --lab-accent-hover: #6f530e;
  --lab-midi: #2a7a4b;
  --lab-stop: #727070;
  --lab-play: #6d9652;
  --lab-mono: "Roboto Mono", monospace;
  --lab-body: "Satoshi", sans-serif;
  --lab-display: "Boska", serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--lab-body);
  background: var(--lab-bg);
  color: var(--lab-text);
  min-height: 100vh;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--lab-bg) 88%, #000);
  backdrop-filter: blur(6px);
}

.overlay.is-hidden { display: none; }

.overlay-panel {
  max-width: 28rem;
  padding: 2rem;
  text-align: center;
  background: var(--lab-surface);
  border: 1px solid var(--lab-border);
  border-radius: 1rem;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.overlay-eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lab-muted);
  margin-bottom: 0.5rem;
}

.overlay-panel h1 {
  font-family: var(--lab-display);
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.overlay-lede {
  color: var(--lab-muted);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.overlay-panel button {
  font: inherit;
  border: none;
  background: var(--lab-accent);
  color: #faf7f0;
  padding: 0.75rem 2rem;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}

.overlay-panel button:hover { background: var(--lab-accent-hover); }

.overlay-note {
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--lab-muted);
}

.lab-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--lab-bg) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--lab-border);
}

.lab-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding: 0.75rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.lab-brand { display: flex; align-items: baseline; gap: 0.75rem; }

.lab-back {
  font-size: 0.75rem;
  color: var(--lab-muted);
  text-decoration: none;
}

.lab-back:hover { color: var(--lab-accent); }

.lab-brand h1 {
  font-family: var(--lab-display);
  font-size: 1.25rem;
  font-weight: 500;
}

.lab-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.text-btn {
  font: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--lab-border);
  border-radius: 999px;
  background: var(--lab-surface);
  color: var(--lab-text);
  cursor: pointer;
  transition: border-color 0.3s, color 0.3s, background 0.3s;
}

.text-btn:hover { border-color: var(--lab-accent); color: var(--lab-accent); }

.lab-tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.lab-tab {
  font: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.6rem 0.9rem;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--lab-muted);
  cursor: pointer;
}

.lab-tab.is-active {
  color: var(--lab-accent);
  border-bottom-color: var(--lab-accent);
}

.lab-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.stage-layout {
  display: grid;
  grid-template-columns: minmax(240px, 400px) 1fr;
  gap: 1.25rem;
  align-items: start;
}

.stage-frame {
  background: #e2d6d6;
  border: 1px solid var(--lab-border);
  border-radius: 0.85rem;
  overflow: hidden;
  aspect-ratio: 1;
}

.stage-frame canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: #1a1a1e;
}

.now-playing {
  margin-top: 0.75rem;
}

.now-label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lab-muted);
  margin-bottom: 0.2rem;
}

.now-playing strong {
  font-family: var(--lab-mono);
  font-size: 0.95rem;
}

.confidence {
  margin-top: 0.4rem;
  height: 0.35rem;
  background: var(--lab-surface-2);
  border-radius: 999px;
  overflow: hidden;
}

.confidence span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--lab-midi);
  transition: width 0.12s;
}

.status-line {
  font-family: var(--lab-mono);
  font-size: 0.75rem;
  color: var(--lab-muted);
  min-height: 1.2em;
  margin: 0.5rem 0;
}

.status-line.is-error { color: #d30909; }

.transport {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
}

.listen-btn.is-active {
  background: var(--lab-play);
  border-color: var(--lab-play);
  color: #faf7f0;
}

.stop-btn:hover {
  border-color: var(--lab-stop);
  color: var(--lab-stop);
}

.range-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--lab-muted);
}

.range-label input[type="range"] { width: 7rem; }

.panel-head { margin-bottom: 0.85rem; }

.panel-head h2 {
  font-family: var(--lab-display);
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
}

.panel-intro {
  max-width: 52ch;
  color: var(--lab-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.lab-panel { display: none; }
.lab-panel.is-active { display: block; }

.model-row {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.5rem 0.65rem;
  margin-bottom: 1rem;
}

.url-field {
  flex: 1 1 16rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.72rem;
  color: var(--lab-muted);
}

.url-input {
  font: inherit;
  font-family: var(--lab-mono);
  font-size: 0.75rem;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--lab-border);
  border-radius: 0.35rem;
  background: var(--lab-surface);
  color: var(--lab-text);
  width: 100%;
}

.file-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--lab-accent);
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  gap: 0.2rem;
}

.file-label input[type="file"] { font-size: 0.7rem; color: var(--lab-muted); }

.slot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.slot {
  background: var(--lab-surface);
  border: 1px solid var(--lab-border);
  border-radius: 0.65rem;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.slot.is-playing {
  border-color: var(--lab-midi);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--lab-midi) 35%, transparent);
}

.slot.is-silent { opacity: 0.72; }

.slot-head {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
}

.slot-num {
  font-family: var(--lab-mono);
  font-size: 0.68rem;
  color: var(--lab-muted);
}

.slot-head strong {
  font-size: 0.9rem;
  word-break: break-word;
}

.slot-file {
  font-family: var(--lab-mono);
  font-size: 0.68rem;
  color: var(--lab-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.slot-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.75rem;
}

.silent-label {
  font-size: 0.72rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
}

.learn-block {
  font-size: 0.85rem;
  color: var(--lab-muted);
  line-height: 1.55;
  margin: 1rem 0 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--lab-accent);
  background: color-mix(in srgb, var(--lab-surface-2) 60%, transparent);
  border-radius: 0 0.5rem 0.5rem 0;
}

.lab-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.75rem;
  color: var(--lab-muted);
}

.lab-footer a { color: var(--lab-accent); text-decoration: none; }
.lab-footer a:hover { text-decoration: underline; }

.help-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(3px);
}

.help-overlay[hidden] { display: none; }

.help-panel {
  position: relative;
  width: min(36rem, 92vw);
  max-height: 86vh;
  overflow: auto;
  background: rgb(225, 233, 180);
  color: #000;
  padding: 2rem 2.25rem;
  border-radius: 0.5rem;
  box-shadow: 0 3rem 5rem rgba(0, 0, 0, 0.3);
}

.help-panel h2 {
  font-family: var(--lab-display);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.help-panel ol {
  padding-left: 1.2rem;
  display: grid;
  gap: 0.65rem;
  font-size: 0.92rem;
  line-height: 1.5;
}

.help-close {
  position: absolute;
  top: 0.4rem;
  right: 0.8rem;
  font-size: 2rem;
  border: none;
  background: none;
  color: #9a9595;
  cursor: pointer;
  line-height: 1;
}

.help-close:hover { color: #d30909; }

@media (max-width: 860px) {
  .stage-layout { grid-template-columns: 1fr; }
  .stage-frame { max-width: 400px; }
}