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

body {
  background: linear-gradient(160deg, #1a1a2e 0%, #16213e 100%);
  font-family: 'Hiragino Maru Gothic Pro', 'Hiragino Kaku Gothic ProN', 'Rounded Mplus 1c', 'Noto Sans JP', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  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: 2rem; font-weight: 900; text-align: center; 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;
  position: relative;
}
.game-top {
  width: 100%;
  padding: 14px 16px 0;
  flex-shrink: 0;
}
.hud-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: #fff;
  padding-bottom: 6px;
}
.hud-label { font-size: 0.8rem; color: #888; }
.hud-q     { font-size: 1.6rem; font-weight: 900; color: #fff; }
.hud-sep   { flex: 1; }
.hud-time  { font-size: 1.8rem; font-weight: 900; color: #FFD54F; min-width: 64px; text-align: right; font-variant-numeric: tabular-nums; }

.question-area {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 14px;
  padding: 8px 16px 24px;
}
.question-rule { font-size: 0.95rem; color: #aaa; font-weight: 700; }

/* ---- 3x3 choices ---- */
.choice-grid {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.choice {
  aspect-ratio: 1;
  border-radius: 18px;
  border: none;
  background: #fff;
  color: #222;
  font-family: inherit;
  font-size: clamp(1rem, 5.2vw, 1.5rem);
  font-weight: 900;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  box-shadow: 0 5px 0 rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  transition: transform 0.1s, background 0.15s, color 0.15s;
  animation: popIn 0.2s ease-out;
}
.choice:active { transform: scale(0.95); }
.choice.correct {
  background: #4CAF50;
  color: #fff;
  animation: correctFlash 0.3s ease-out;
}
.choice.wrong {
  background: #f44336;
  color: #fff;
  animation: wrongShake 0.3s ease-in-out;
}
.choice.disabled, .choice:disabled {
  background: #3a3a4e;
  color: #777;
  box-shadow: 0 2px 0 rgba(0,0,0,0.3);
  cursor: default;
  text-decoration: line-through;
}
@keyframes popIn {
  0%   { transform: scale(0.8); opacity: 0.3; }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes correctFlash {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.1); }
  100% { transform: scale(1); }
}
@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-7px); }
  75%       { transform: translateX(7px); }
}

/* ---- Overlay ---- */
.overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  font-size: 3rem;
  font-weight: 900;
  text-shadow: 0 4px 16px rgba(0,0,0,0.6);
}
.overlay.show { display: flex; animation: overlayIn 0.2s ease-out; }
.overlay.ok { color: #8BC34A; }
.overlay.ng { color: #FF5252; }
@keyframes overlayIn {
  0%   { transform: scale(0.5); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

/* ---- Result ---- */
#screen-result {
  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 28px;
  width: 100%;
  max-width: 320px;
  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; align-items: flex-end; }
.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; font-variant-numeric: tabular-nums; }
.go-val.big { font-size: 2.5rem; color: #FFD54F; }
.go-unit { font-size: 0.7rem; color: #888; }
.new-record {
  display: none;
  font-size: 0.9rem;
  font-weight: 900;
  color: #1a1a2e;
  background: #FFD54F;
  border-radius: 999px;
  padding: 4px 14px;
  align-self: center;
  animation: popIn 0.3s ease-out;
}
.new-record.show { display: inline-block; }

/* ---- Buttons ---- */
.btn-primary, .btn-secondary, .btn-share {
  display: block;
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 16px;
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
}
.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); }
.btn-share {
  background: #000;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.25);
  box-shadow: 0 4px 0 rgba(0,0,0,0.5);
}
.btn-share:active { transform: translateY(3px); box-shadow: 0 1px 0 rgba(0,0,0,0.5); }