.cover-demo-page {
  min-height: 100vh;
}

.cover-demo-main {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cover-demo-stage-wrap {
  position: relative;
  width: 100%;
  border-bottom: 1px solid var(--contour);
  background:
    radial-gradient(ellipse 65% 50% at 50% 35%, color-mix(in srgb, var(--accent) 7%, transparent), transparent 70%),
    #050505;
}

.cover-demo-stage {
  width: 100%;
  height: min(72vh, 42rem);
  min-height: 22rem;
}

.cover-demo-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.cover-demo-stage-label {
  position: absolute;
  top: 0.85rem;
  left: clamp(1rem, 3vw, 2rem);
  z-index: 2;
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--foreground-diminished);
  pointer-events: none;
}

.cover-demo-panel {
  padding: 1.75rem 0 3rem;
}

.cover-demo-intro {
  margin: 0.35rem 0 1.5rem;
  max-width: 40rem;
  color: var(--foreground-diminished);
}

.cover-demo-status {
  margin: 0 0 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--selected);
}

.cover-demo-section + .cover-demo-section {
  margin-top: 1.75rem;
}

.cover-demo-section h2 {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--foreground-diminished);
}

.cover-concept-picker,
.cover-sample-picker {
  display: grid;
  gap: 0.65rem;
}

.cover-concept-picker {
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
}

.cover-sample-picker {
  grid-template-columns: repeat(auto-fill, minmax(7.5rem, 1fr));
}

.cover-picker-btn,
.cover-sample-btn {
  appearance: none;
  margin: 0;
  text-align: left;
  cursor: pointer;
  border: 1px solid var(--contour);
  background: color-mix(in srgb, var(--background-3) 35%, transparent);
  color: var(--foreground);
  transition:
    border-color 0.15s ease,
    background 0.15s ease,
    color 0.15s ease;
}

.cover-picker-btn {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.85rem 0.95rem;
  border-radius: 0.35rem;
}

.cover-picker-btn strong {
  font-size: 0.95rem;
  color: var(--selected);
}

.cover-picker-btn span {
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--foreground-diminished);
}

.cover-picker-btn:hover,
.cover-picker-btn:focus-visible,
.cover-sample-btn:hover,
.cover-sample-btn:focus-visible {
  border-color: color-mix(in srgb, var(--selected) 55%, var(--contour));
  outline: none;
}

.cover-picker-btn.is-active,
.cover-sample-btn.is-active {
  border-color: var(--selected);
  background: color-mix(in srgb, var(--selected) 10%, transparent);
}

.cover-sample-btn {
  padding: 0.7rem 0.85rem;
  border-radius: 0.3rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-left: 3px solid var(--sample-accent, var(--contour));
}

.cover-flat-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  align-items: end;
}

.cover-flat-card {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.cover-flat-card figcaption {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--foreground-diminished);
}

.cover-flat-frame {
  border: 1px solid var(--contour);
  background: #000;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cover-flat-card--phone .cover-flat-frame {
  aspect-ratio: 390 / 844;
  max-height: 22rem;
  margin-inline: auto;
  width: min(100%, 11rem);
}

.cover-flat-card--tablet .cover-flat-frame,
.cover-flat-card--monitor .cover-flat-frame {
  width: 100%;
}

.cover-flat-card--tablet .cover-flat-frame {
  aspect-ratio: 1100 / 768;
}

.cover-flat-card--monitor .cover-flat-frame {
  aspect-ratio: 1440 / 900;
}

.cover-flat-canvas {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover-demo-note {
  margin: 1.5rem 0 0;
  max-width: 38rem;
  font-size: 0.88rem;
  color: var(--foreground-diminished);
}

@media (max-width: 900px) {
  .cover-demo-stage {
    height: min(58vh, 28rem);
  }

  .cover-flat-gallery {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .cover-flat-card--tablet .cover-flat-frame,
  .cover-flat-card--monitor .cover-flat-frame {
    max-width: 28rem;
  }
}