html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #0a0a0a;
  height: 100%;
}

/* ── Crossfade overlay ────────────────────────────────────────── */
#fade-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: #0a0a0a;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

#fade-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ── Title block (always visible) ─────────────────────────────── */
#title-block {
  position: fixed;
  top: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  text-align: center;
  pointer-events: none;
}

#title-block h1 {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-weight: 200;
  font-size: clamp(20px, 3vw, 36px);
  letter-spacing: 0.2em;
  color: rgba(192, 192, 192, 0.5);
  margin: 0 0 4px;
  text-transform: uppercase;
}

#title-block .byline {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 12px;
  color: rgba(102, 102, 102, 0.5);
  margin: 0;
}

/* ── Shared UI panel behaviour ────────────────────────────────── */
#showcase-ui,
#creator-ui {
  position: fixed;
  bottom: max(16px, env(safe-area-inset-bottom, 16px));
  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,
#creator-ui.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ── Showcase UI ──────────────────────────────────────────────── */
#showcase-ui {
  flex-direction: column;
  gap: 12px;
}

#make-own-btn {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 14px 48px;
  border: 1px solid #555;
  border-radius: 2px;
  background: transparent;
  color: #999;
  cursor: pointer;
  transition: all 0.2s ease;
}

#make-own-btn:hover {
  border-color: #aaa;
  color: #ddd;
}

#showcase-ui .hint {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 12px;
  color: #444;
  margin: 0;
  letter-spacing: 0.03em;
}

/* ── Creator UI ───────────────────────────────────────────────── */
#creator-ui {
  background: rgba(20, 20, 20, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 16px 20px;
  gap: 16px;
  max-width: calc(100vw - 32px);
  box-sizing: border-box;
  flex-wrap: wrap;
  justify-content: center;
}

.slider-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  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: #777;
}

/* ── Range slider styling ─────────────────────────────────────── */
input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 2px;
  outline: none;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #888;
  border: none;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.1s ease;
}

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

input[type='range']::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #888;
  border: none;
  cursor: pointer;
}

/* ── Back & Shuffle buttons ───────────────────────────────────── */
#back-btn,
#shuffle-btn {
  font-family: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 8px 20px;
  white-space: nowrap;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  background: transparent;
  color: #777;
  cursor: pointer;
  transition: all 0.15s ease;
}

#back-btn:hover,
#shuffle-btn:hover {
  border-color: rgba(255, 255, 255, 0.3);
  color: #bbb;
}

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

#canvas-container canvas {
  display: block;
}