:root {
  --bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --border: #dddddd;
  --panel: #f8f8f8;
  --accent: #3366cc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  color: var(--text);
  background: var(--bg);
}

.site-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
}

.site-header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
}

.site-header p {
  margin: 0;
  max-width: 800px;
  color: var(--muted);
  line-height: 1.5;
}

.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.25rem 3rem;
  display: grid;
  grid-template-columns: minmax(0, 2fr) 370px;
  gap: 1.5rem;
}

.plot-panel {
  min-width: 0;
}

#plot {
  width: 100%;
  height: 620px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.caption {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
  margin: 0.75rem 0 0;
}

.audio-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  align-self: start;
  position: sticky;
  top: 1rem;
}

.audio-panel h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.metadata dl {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 0.35rem 0.75rem;
  margin: 0;
  font-size: 0.92rem;
}

.metadata dt {
  color: var(--muted);
}

.metadata dd {
  margin: 0;
  font-weight: 600;
  word-break: break-word;
}

.audio-block {
  margin-top: 1.25rem;
}

.audio-block h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

audio {
  width: 100%;
}

button {
  margin-top: 0.45rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: white;
  color: var(--text);
  cursor: pointer;
}

button:hover {
  background: #eeeeee;
}

.loop-toggle {
  display: block;
  margin-top: 1rem;
  font-size: 0.95rem;
}

.note {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
  margin-bottom: 0;
}

.error {
  padding: 2rem;
  color: #aa0000;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .audio-panel {
    position: static;
  }

  #plot {
    height: 520px;
  }
}