* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: linear-gradient(160deg, #1a1a2e 0%, #16213e 100%);
  font-family: 'Hiragino Maru Gothic Pro', 'Rounded Mplus 1c', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  user-select: none;
  -webkit-user-select: none;
  overflow: hidden;
}

/* ---- Screens ---- */
.screen { display: none; width: 100%; max-width: 480px; flex-direction: column; align-items: center; }
.screen.active { display: flex; }

/* ---- Title ---- */
#screen-title {
  justify-content: center;
  min-height: 100vh;
  padding: 24px 20px;
  gap: 22px;
  color: #fff;
}
.logo { font-size: 2.4rem; font-weight: 900; text-shadow: 0 0 20px rgba(255,255,255,0.3); }
.rule-text {
  text-align: center;
  font-size: 1rem;
  line-height: 1.8;
  color: #ccc;
}
.rule-text strong { color: #FFD54F; }
.rule-text small  { color: #888; font-size: 0.8rem; }

.title-hs-wrap {
  background: rgba(255,255,255,0.07);
  border-radius: 14px;
  padding: 14px 32px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.1);
}
.hs-label { display: block; font-size: 0.75rem; color: #888; margin-bottom: 4px; }
.hs-val   { font-size: 2.2rem; font-weight: 900; color: #FFD54F; }

/* ---- Game screen ---- */
#screen-game {
  height: 100vh;
  justify-content: flex-start;
  padding: 0;
}

/* Timer bar */
.game-top {
  width: 100%;
  padding: 10px 16px 0;
  flex-shrink: 0;
}
.timer-bar-wrap {
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  height: 10px;
  overflow: hidden;
  margin-bottom: 6px;
}
.timer-bar {
  height: 100%;
  background: linear-gradient(90deg, #4CAF50, #CDDC39);
  border-radius: 8px;
  width: 100%;
  transition: width 0.9s linear, background 0.5s;
}
.timer-bar.danger { background: linear-gradient(90deg, #f44336, #FF5722); animation: barShake 0.5s ease-in-out infinite; }
@keyframes barShake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-2px); }
  75%       { transform: translateX(2px); }
}

.hud-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: #fff;
  padding-bottom: 6px;
}
.hud-label { font-size: 0.7rem; color: #888; }
.hud-time  { font-size: 1.5rem; font-weight: 900; color: #fff; min-width: 32px; }
.hud-sep   { flex: 1; }
.hud-score { font-size: 1.8rem; font-weight: 900; color: #FFD54F; min-width: 40px; text-align: right; }

/* ---- Question ---- */
.question-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding: 16px;
}
.question-text {
  font-size: 5rem;
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
  animation: popIn 0.2s ease-out;
}
@keyframes popIn {
  0%   { transform: scale(0.7); opacity: 0.5; }
  70%  { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}
.question-rule { font-size: 0.8rem; color: #888; }

/* ---- Color panels ---- */
.color-panels {
  width: 100%;
  padding: 12px 16px 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  flex-shrink: 0;
}

.color-panel {
  aspect-ratio: 1;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 0.1s;
  box-shadow: 0 6px 0 rgba(0,0,0,0.3);
  position: relative;
  overflow: hidden;
}
.color-panel:active { transform: scale(0.95); }
.color-panel.correct-flash {
  animation: correctFlash 0.2s ease-out;
}
@keyframes correctFlash {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.08); filter: brightness(1.3); }
  100% { transform: scale(1); }
}
.color-panel.wrong-shake {
  animation: wrongShake 0.25s ease-in-out;
  box-shadow: 0 0 0 4px #f44336, 0 6px 0 rgba(0,0,0,0.3);
}
@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-6px); }
  75%       { transform: translateX(6px); }
}

/* ---- Gameover ---- */
#screen-gameover {
  justify-content: center;
  min-height: 100vh;
  padding: 24px 20px;
  color: #fff;
}
.go-inner {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 24px;
  padding: 32px;
  width: 100%;
  max-width: 300px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.go-emoji { font-size: 3rem; }
.go-title { font-size: 1.6rem; font-weight: 900; color: #FFD54F; }
.go-score-wrap { display: flex; justify-content: space-around; }
.go-stat { display: flex; flex-direction: column; align-items: center; }
.go-label { font-size: 0.7rem; color: #888; }
.go-val { font-size: 1.5rem; font-weight: 800; color: #fff; }
.go-val.big { font-size: 2.5rem; color: #FFD54F; }

/* ---- Buttons ---- */
.btn-primary, .btn-secondary {
  display: block;
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 16px;
  font-size: 1.1rem;
  font-weight: 800;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, #FFD54F, #FF8F00);
  color: #fff;
  box-shadow: 0 4px 0 #e65100;
}
.btn-primary:active { transform: translateY(3px); box-shadow: 0 1px 0 #e65100; }
.btn-secondary {
  background: rgba(255,255,255,0.07);
  color: #aaa;
  border: 1px solid rgba(255,255,255,0.12);
}
.btn-secondary:active { background: rgba(255,255,255,0.14); }