html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #f0f0f0;
  height: 100%;
}

/* ── Canvas ────────────────────────────────────────────────────── */
#canvas-container {
  position: fixed;
  top: 0;
  left: 0;
}

#canvas-container canvas {
  display: block;
}

/* ── Shared UI panel behaviour ────────────────────────────────── */
#showcase-ui,
#interactive-ui {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 24px;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#showcase-ui.hidden,
#interactive-ui.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ── Showcase UI ──────────────────────────────────────────────── */
#make-own-btn {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 10px 32px;
  border: 1.5px solid rgba(0, 0, 0, 0.2);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.85);
  color: #333;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all 0.2s ease;
}

#make-own-btn:hover {
  border-color: #8b3a3a;
  color: #8b3a3a;
  background: rgba(255, 245, 245, 0.9);
}

/* ── Interactive UI ───────────────────────────────────────────── */
#interactive-ui {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1.5px solid rgba(0, 0, 0, 0.12);
  border-radius: 8px;
  padding: 12px 24px;
  max-width: calc(100vw - 32px);
  flex-wrap: wrap;
  justify-content: center;
}

#back-btn {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  letter-spacing: 0.03em;
  padding: 6px 14px;
  border: 1.5px solid rgba(0, 0, 0, 0.15);
  border-radius: 4px;
  background: transparent;
  color: #666;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

#back-btn:hover {
  border-color: rgba(0, 0, 0, 0.3);
  color: #333;
}

#shuffle-btn {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  letter-spacing: 0.03em;
  padding: 6px 14px;
  border: 1.5px solid rgba(139, 58, 58, 0.3);
  border-radius: 4px;
  background: transparent;
  color: #8b3a3a;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

#shuffle-btn:hover {
  border-color: #8b3a3a;
  background: rgba(139, 58, 58, 0.06);
}

#copy-btn {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  letter-spacing: 0.03em;
  padding: 6px 14px;
  border: 1.5px solid rgba(0, 0, 0, 0.15);
  border-radius: 4px;
  background: transparent;
  color: #666;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

#copy-btn:hover {
  border-color: rgba(0, 0, 0, 0.3);
  color: #333;
}

/* ── Slider groups ────────────────────────────────────────────── */
.slider-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 100px;
  flex: 1 1 100px;
}

.slider-group label {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #888;
}

/* ── Range slider styling ─────────────────────────────────────── */
input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: rgba(0, 0, 0, 0.1);
  outline: none;
  cursor: pointer;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #8b3a3a;
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  transition: transform 0.1s ease;
}

input[type='range']::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type='range']::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #8b3a3a;
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}

/* ── Hint text (reusable) ─────────────────────────────────────── */
.hint {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 12px;
  color: #bbb;
  letter-spacing: 0.03em;
}

/* ── Print-only metadata (hidden on screen) ──────────────────── */
#print-meta {
  display: none;
}

/* ── Print layout ────────────────────────────────────────────── */
@media print {
  @page {
    size: letter portrait;
    margin: 0;
  }

  html, body {
    background: white;
    overflow: visible;
    height: auto;
  }

  #showcase-ui,
  #interactive-ui {
    display: none !important;
  }

  #canvas-container {
    position: static;
    display: flex;
    justify-content: center;
    padding: 1in 1in 0;
  }

  #canvas-container canvas {
    width: auto !important;
    height: auto !important;
    max-width: 6.5in;
    max-height: 7.5in;
    object-fit: contain;
  }

  #print-meta {
    display: flex;
    flex-direction: column;
    position: fixed;
    bottom: 1in;
    left: 1in;
    gap: 2pt;
  }

  .print-title {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 300;
    font-size: 12pt;
    letter-spacing: 0.02em;
    color: #000;
  }

  .print-code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 9pt;
    letter-spacing: 0.05em;
    color: #000;
  }

  .print-year {
    font-family: 'Courier New', Courier, monospace;
    font-size: 8pt;
    color: #666;
  }
}