:root {
  --sampler-panel: color-mix(in srgb, var(--surface) 92%, var(--accent) 8%);
  --sampler-border: color-mix(in srgb, var(--border) 72%, var(--accent) 28%);
  --sampler-muted: color-mix(in srgb, var(--text) 58%, transparent);
  --sampler-zone: color-mix(in srgb, var(--accent) 74%, var(--accent-2) 26%);
}

.sampler-main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto 18px;
  display: grid;
  grid-template-columns: minmax(420px, 1.3fr) minmax(290px, 0.82fr);
  gap: 16px;
}

.instrument-lede {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto 14px;
  color: var(--sampler-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

.instrument-lede strong {
  color: var(--text);
}

.loader-panel,
.program-panel {
  border: 1px solid var(--sampler-border);
  border-radius: 18px;
  background: var(--sampler-panel);
  box-shadow: 0 18px 42px color-mix(in srgb, var(--pure-black) 18%, transparent);
}

.loader-panel {
  padding: 20px;
}

.loader-copy h2,
.program-heading h2 {
  margin: 3px 0 7px;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
}

.loader-copy p,
.program-heading p {
  margin: 0;
  color: var(--sampler-muted);
  line-height: 1.5;
}

.eyebrow {
  font: 600 0.68rem/1.2 'JetBrains Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent) !important;
}

.loader-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.loader-actions button,
.drop-zone {
  min-height: 40px;
}

.loader-actions button {
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  color: var(--text);
  padding: 8px 11px;
  font: inherit;
  cursor: pointer;
  font-weight: 650;
}

.loader-actions .primary-action {
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--pure-white);
}

.drop-zone {
  display: grid;
  place-items: center;
  margin-top: 12px;
  padding: 16px;
  border: 1px dashed color-mix(in srgb, var(--accent) 58%, var(--border));
  border-radius: 11px;
  color: var(--sampler-muted);
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, transform 140ms ease;
}

.drop-zone.drag-active,
.drop-zone:focus-visible {
  outline: none;
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  transform: translateY(-1px);
}

.load-error:empty {
  display: none;
}

.load-error {
  margin: 12px 0 0;
  color: var(--danger);
  font-size: 0.82rem;
  line-height: 1.45;
}

.panel-note {
  margin: 16px 0 0;
  color: var(--sampler-muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.program-panel {
  padding: 20px;
  overflow: hidden;
}

.program-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
}

.program-stats {
  display: flex;
  gap: 9px;
  margin: 0;
}

.program-stats div {
  min-width: 64px;
  padding: 8px 9px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  text-align: center;
}

.program-stats dt {
  color: var(--sampler-muted);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.program-stats dd {
  margin: 3px 0 0;
  font: 600 0.82rem/1.2 'JetBrains Mono', monospace;
}

.zone-map {
  position: relative;
  height: 128px;
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent calc(8.333% - 1px),
      color-mix(in srgb, var(--border) 45%, transparent) calc(8.333% - 1px),
      color-mix(in srgb, var(--border) 45%, transparent) 8.333%
    ),
    color-mix(in srgb, var(--surface) 82%, transparent);
}

.zone {
  position: absolute;
  min-width: 3px;
  height: 20px;
  border: 1px solid color-mix(in srgb, var(--sampler-zone) 62%, var(--pure-white));
  border-radius: 5px;
  background: color-mix(in srgb, var(--sampler-zone) 68%, transparent);
  overflow: hidden;
  padding: 2px 5px;
  color: var(--pure-white);
  font: 500 0.58rem/1.2 'JetBrains Mono', monospace;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.sampler-stage {
  flex: 1;
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 220px;
  padding: 8px 18px 24px;
  overflow-x: auto;
}

.sampler-stage .piano-keyboard {
  width: min(1180px, 100%);
  min-width: calc(var(--white-key-count) * 25px);
  height: clamp(210px, 36vh, 330px);
  margin: auto;
}

@media (max-width: 820px) {
  .sampler-main {
    grid-template-columns: 1fr;
  }

  .program-heading {
    flex-direction: column;
  }

  .program-stats {
    width: 100%;
  }

  .program-stats div {
    flex: 1;
  }
}

@media (max-width: 520px) {
  .sampler-main {
    width: calc(100% - 20px);
  }

  .loader-panel,
  .program-panel {
    padding: 15px;
    border-radius: 14px;
  }

  .instrument-lede {
    width: calc(100% - 20px);
  }

  .zone-map {
    height: 108px;
  }

  .sampler-stage {
    min-height: 190px;
    padding-inline: 10px;
  }
}