:root {
  --wood: #8b5a2b;
  --ink: #3d2814;
  --muted: #6a5038;
  --stone: #1a1410;
  --sakura: #ffb4c8;
  --gold: #ffd700;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  touch-action: none;
}

html,
body {
  margin: 0;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  font-family: "Jua", system-ui, sans-serif;
  background:
    radial-gradient(ellipse at 15% 20%, rgba(255, 180, 200, 0.25), transparent 40%),
    radial-gradient(ellipse at 85% 80%, rgba(255, 200, 180, 0.18), transparent 38%),
    linear-gradient(165deg, #2a1c14, #1a1410 55%, #241810);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
}

.stage {
  position: relative;
  width: min(100vw, calc(100dvh * 0.557));
  height: min(100dvh, calc(100vw / 0.557));
  max-width: 420px;
  border-radius: 18px;
  overflow: hidden;
  box-shadow:
    0 18px 50px rgba(0, 0, 0, 0.55),
    0 0 0 3px rgba(196, 142, 77, 0.35);
  background: #c48e4d;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hud {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  z-index: 3;
}

.panel {
  background: rgba(40, 24, 12, 0.55);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 180, 200, 0.18);
  border-radius: 14px;
  padding: 8px 12px;
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 13px;
  min-width: 96px;
  pointer-events: none;
}

.panel.right {
  align-items: flex-end;
  pointer-events: auto;
}

.undo-btn {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 6px 12px;
  font: inherit;
  font-size: 13px;
  color: #fff;
  background: rgba(255, 180, 200, 0.28);
  cursor: pointer;
}

.undo-btn:active {
  background: rgba(255, 180, 200, 0.45);
}

.undo-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  background:
    radial-gradient(ellipse at 50% 12%, rgba(255, 250, 230, 0.55), transparent 48%),
    radial-gradient(circle at 12% 80%, rgba(255, 180, 200, 0.4), transparent 32%),
    radial-gradient(circle at 90% 25%, rgba(255, 200, 160, 0.35), transparent 30%),
    linear-gradient(180deg, rgba(210, 160, 100, 0.94), rgba(245, 230, 210, 0.97));
}

.overlay.hidden {
  display: none;
}

.hero-art {
  width: min(42vw, 168px);
  height: min(42vw, 168px);
  object-fit: cover;
  border-radius: 28px;
  margin-bottom: 10px;
  box-shadow:
    0 12px 28px rgba(0, 0, 0, 0.35),
    0 0 0 3px rgba(255, 215, 0, 0.35);
}

.badge {
  display: inline-block;
  background: var(--wood);
  color: #fff;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  margin-bottom: 8px;
}

.badge.soft {
  background: linear-gradient(180deg, #ffe27a, #e8b020);
  color: #4a3010;
  box-shadow: 0 3px 0 #a87820;
}

h1 {
  margin: 0;
  font-family: "Bagel Fat One", "Jua", cursive;
  font-weight: 400;
  font-size: clamp(34px, 9vw, 46px);
  color: var(--wood);
  text-shadow: 0 3px 0 #fff;
}

.overlay p {
  margin: 8px 0 14px;
  color: var(--muted);
  line-height: 1.45;
}

.diff-picker {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.diff-btn {
  appearance: none;
  border: 2px solid rgba(139, 90, 43, 0.35);
  border-radius: 999px;
  padding: 8px 16px;
  font: inherit;
  font-size: 15px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.55);
  cursor: pointer;
}

.diff-btn.active {
  border-color: var(--wood);
  color: #fff;
  background: var(--wood);
}

.btn {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 13px 32px;
  font: inherit;
  font-size: 18px;
  color: #fff;
  background: linear-gradient(180deg, #a87038, #7a5020);
  box-shadow: 0 7px 0 #4a3010;
  cursor: pointer;
}

.btn:active {
  transform: translateY(3px);
  box-shadow: 0 4px 0 #4a3010;
}

a {
  margin-top: 12px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}