* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg: #f0f4ff;
  --primary: #6c63ff;
  --secondary: #ff6b9d;
  --text: #333;
  --card: #fff;
  --radius: 16px;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  color: var(--text);
  user-select: none;
  touch-action: none;
}

/* ---- Screens ---- */
.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 20px;
  position: absolute;
  inset: 0;
}
.screen.active { display: flex; }

/* ---- Title ---- */
.logo {
  font-size: clamp(2.8rem, 11vw, 4.5rem);
  font-weight: 900;
  text-align: center;
  line-height: 1.1;
  color: var(--primary);
  text-shadow: 4px 4px 0 rgba(108,99,255,0.18);
  margin-bottom: 28px;
  letter-spacing: 2px;
}

.highscore-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 28px;
  background: var(--card);
  padding: 12px 32px;
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
}
.highscore-display .stat-label {
  font-size: 0.8rem;
  margin-bottom: 4px;
}
.highscore-display span:last-child {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--secondary);
}

.controls-hint {
  margin-top: 20px;
  text-align: center;
  font-size: 0.75rem;
  color: #aaa;
  line-height: 2;
}

/* ---- Buttons ---- */
.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 16px 52px;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 5px 20px rgba(108,99,255,0.4);
  transition: transform 0.1s, box-shadow 0.1s;
  min-height: 52px;
  letter-spacing: 1px;
}
.btn-primary:active {
  transform: scale(0.96);
  box-shadow: 0 2px 8px rgba(108,99,255,0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 50px;
  padding: 13px 36px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 48px;
}

.btn-icon {
  background: var(--card);
  border: none;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  flex-shrink: 0;
}

/* ---- Game screen ---- */
#screen-game {
  justify-content: flex-start;
  padding: 0;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.game-header {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 420px;
  padding: 6px 10px;
  background: var(--card);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  gap: 6px;
  flex-shrink: 0;
}

.stat-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  min-width: 0;
}

.stat-label {
  font-size: 0.6rem;
  color: #bbb;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text);
  white-space: nowrap;
}

.next-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

#canvas-next {
  border-radius: 6px;
  display: block;
}

.btn-group {
  display: flex;
  gap: 4px;
}

/* ---- Canvas area ---- */
.canvas-wrap {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  width: 100%;
}

#canvas-game {
  display: block;
}

/* ---- Pause overlay ---- */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
}
.overlay.hidden { display: none; }

.overlay-inner {
  background: var(--card);
  border-radius: var(--radius);
  padding: 36px 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.overlay-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
}

/* ---- Game Over ---- */
.gameover-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: 24px;
  text-shadow: 3px 3px 0 rgba(255,107,157,0.15);
}

.result-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 32px;
  width: 100%;
  max-width: 320px;
  margin-bottom: 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid #f0f0f0;
  font-size: 1rem;
}
.result-row:last-child { border-bottom: none; }
.result-row span:last-child { font-weight: 800; }
.result-highlight { color: var(--secondary); }
.result-highlight span { font-weight: 900 !important; }

.button-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}