:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --panel-border: #dbdfe6;
  --text: #1b1f27;
  --muted: #5d6673;
  --accent: #2f6fed;
  --accent-dim: #1f5fd9;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  font-size: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.page-header {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 20px 20px;
}

.page-header h1 {
  font-size: 1.8rem;
  margin: 0 0 14px;
}

.page-header .links {
  margin: 0 0 20px;
  font-size: 0.95rem;
}

.page-header .links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.page-header .links a:hover {
  color: var(--accent-dim);
  text-decoration: underline;
}

.architecture-figure {
  display: block;
  width: 100%;
  height: auto;
  margin: 4px 0 20px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 16px;
}

.abstract-heading {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}

.abstract {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.6;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 20px 22px;
  margin-bottom: 20px;
}

.sample-picker-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.sample-picker-row label {
  font-weight: 600;
}

select {
  background: #f0f2f5;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.95rem;
}

.sample-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Everything the user compares (Query, model selector/audio, predictor-input and
   target-curve panels) lives in one static block (.listening-area), in reading order --
   no sticky/fixed/absolute positioning, so nothing shifts or gets covered while
   scrolling. */

.midi-viz canvas {
  width: 100%;
  display: block;
  background: #fafbfc;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
}

.string-legend,
.midi-legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--muted);
}

.string-legend .swatch,
.midi-legend .swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 5px;
  vertical-align: middle;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  color: inherit;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  opacity: 1;
  transition: opacity 0.15s ease;
}

.legend-item .swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 5px;
  vertical-align: middle;
}

.legend-item:hover { opacity: 0.8; }

.legend-item.off {
  opacity: 0.35;
  text-decoration: line-through;
}

.audio-block {
  margin-top: 16px;
}

.audio-block-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.hint-text { color: var(--muted); font-size: 0.82rem; }

audio {
  display: block;
  width: 100%;
  height: 42px;
}

.pill-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pill-btn {
  background: #eef1f5;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 22px;
  padding: 8px 17px;
  font-size: 0.95rem;
  cursor: pointer;
}

.pill-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: #fff;
}

.model-description {
  color: var(--muted);
  font-size: 0.82rem;
  margin: 8px 0 0;
}

.curve-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 18px 0 4px;
  flex-wrap: wrap;
  gap: 8px;
}

.curve-section-header h3 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

.plot-details {
  margin-top: 18px;
}

.plot-details > summary {
  list-style: none;
  cursor: pointer;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  user-select: none;
}

.plot-details > summary::-webkit-details-marker {
  display: none;
}

.plot-details > summary::before {
  content: "\25B8";
  display: inline-block;
  color: var(--muted);
  transition: transform 0.15s ease;
}

.plot-details[open] > summary::before {
  transform: rotate(90deg);
}

.plot-details > summary:hover {
  color: var(--accent);
}

.section-details {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 2px solid var(--panel-border);
}

.section-details:first-of-type {
  margin-top: 20px;
  padding-top: 0;
  border-top: none;
}

.section-details > summary {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.section-details > summary::before {
  font-size: 1.1rem;
}

.curve-group {
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  overflow: hidden;
  background: #fafbfc;
}

.curve-row {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--panel-border);
}

.curve-row:last-child { border-bottom: none; }

.curve-row .curve-label {
  width: 220px;
  flex: 0 0 220px;
  font-size: 0.82rem;
  color: var(--muted);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  border-right: 1px solid var(--panel-border);
}

.curve-row canvas {
  flex: 1 1 auto;
  display: block;
  width: 100%;
  height: 68px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.comparison-col {
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: #fafbfc;
  overflow: hidden;
}

.comparison-title {
  font-size: 0.82rem;
  color: var(--muted);
  padding: 8px 12px;
  border-bottom: 1px solid var(--panel-border);
}

.comparison-col canvas {
  display: block;
  width: 100%;
  height: 190px;
}

@media (max-width: 640px) {
  .comparison-grid { grid-template-columns: 1fr; }
}