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

body {
  background: #000;
  color: #fff;
  font-family: 'Hiragino Mincho ProN', 'Yu Mincho', 'MS Mincho', serif;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  user-select: none;
}

/* --- 画面切り替え --- */
.screen {
  display: none;
  width: 100vw;
  height: 100vh;
}
.screen.active {
  display: flex;
}

/* --- タイトル画面 --- */
#title-screen {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #000;
}

.title-content {
  text-align: center;
}

.title-main {
  font-size: 4rem;
  font-weight: normal;
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
  animation: fadeIn 1s ease;
}

.title-sub {
  font-size: 1.1rem;
  color: #888;
  letter-spacing: 0.3em;
  margin-bottom: 3rem;
  animation: fadeIn 1.5s ease;
}

button {
  background: transparent;
  color: #fff;
  border: 1px solid #fff;
  padding: 0.8rem 2.5rem;
  font-size: 1.1rem;
  font-family: inherit;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  animation: fadeIn 2s ease;
}

button:hover {
  background: #fff;
  color: #000;
}

/* --- ゲーム画面 --- */
#game-screen {
  flex-direction: column;
}

#game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  background: #000;
  border-bottom: 1px solid #222;
  height: auto;
  flex-shrink: 0;
  letter-spacing: 0.1em;
}

#stage-label {
  font-size: 0.85rem;
  color: #555;
  min-width: 60px;
}

#stage-title {
  font-size: 3.5rem;
  letter-spacing: 0.2em;
  flex: 1;
  text-align: left;
  padding-left: 1rem;
  line-height: 1.1;
}

#timer {
  font-size: 3.5rem;
  font-variant-numeric: tabular-nums;
  color: #888;
  letter-spacing: 0.05em;
  transition: color 0.2s;
  white-space: nowrap;
}

#mistake-count {
  font-size: 0.85rem;
  color: #c00;
  min-width: 70px;
  text-align: right;
}

/* --- グリッド --- */
#grid {
  flex: 1;
  display: grid;
  overflow: hidden;
  background: #000;
}

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: inherit;
  color: #fff;
  transition: color 0.1s;
  line-height: 1;
}

.cell:hover {
  color: #aaa;
}

.cell.wrong {
  color: #f00;
  animation: shake 0.3s ease;
}

.cell.correct {
  color: #0f0;
  animation: pop 0.5s ease forwards;
}

/* --- 煽りボックス --- */
#taunt-box {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.9);
  border: 1px solid #444;
  padding: 0.7rem 2rem;
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: #aaa;
  white-space: nowrap;
  animation: slideUp 0.3s ease;
  z-index: 100;
}

#taunt-box.hidden {
  display: none;
}

/* --- ゲームオーバー画面 --- */
#gameover-screen {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #000;
  text-align: center;
}

/* --- クリア画面 --- */
#clear-screen {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #000;
}

.clear-content {
  text-align: center;
}

.clear-title {
  font-size: 5rem;
  font-weight: normal;
  letter-spacing: 0.3em;
  margin-bottom: 2rem;
  animation: fadeIn 0.8s ease;
}

#enlightenment-score {
  font-size: 5rem;
  font-weight: bold;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
  animation: fadeIn 1s ease;
}

#diagnosis-comment {
  font-size: 1.2rem;
  color: #888;
  letter-spacing: 0.15em;
  margin-bottom: 1.5rem;
  max-width: 500px;
  line-height: 1.8;
  animation: fadeIn 1.2s ease;
}

#clear-stats {
  font-size: 0.9rem;
  color: #444;
  letter-spacing: 0.1em;
  margin-bottom: 2.5rem;
  animation: fadeIn 1.4s ease;
}

#retry-btn {
  animation: fadeIn 1.6s ease;
}

#gameover-stage {
  font-size: 2.8rem;
  color: #c00;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  animation: fadeIn 1s ease;
}

#gameover-stats {
  font-size: 1.8rem;
  color: #444;
  letter-spacing: 0.1em;
  margin-bottom: 2.5rem;
  animation: fadeIn 1.2s ease;
}

/* --- アニメーション --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-4px); }
  75%       { transform: translateX(4px); }
}

@keyframes pop {
  0%   { transform: scale(1); }
  50%  { transform: scale(2.5); }
  100% { transform: scale(1.5); opacity: 0.5; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* --- レスポンシブ（スマホ対応） --- */
@media (max-width: 600px) {
  .title-main {
    font-size: 2.5rem;
  }

  .title-sub {
    font-size: 0.9rem;
    margin-bottom: 2rem;
  }

  button {
    padding: 0.7rem 1.5rem;
    font-size: 1rem;
  }

  #game-header {
    padding: 0.2rem 0.4rem;
    gap: 0;
    flex-wrap: nowrap;
    align-items: center;
  }

  #stage-label {
    font-size: 0.65rem;
    min-width: auto;
  }

  #stage-title {
    font-size: 0.95rem;
    padding-left: 0.2rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  #timer {
    font-size: 1.4rem;
    white-space: nowrap;
  }

  #mistake-count {
    font-size: 0.65rem;
    min-width: auto;
  }

  .clear-title {
    font-size: 2.8rem;
    margin-bottom: 1rem;
  }

  #enlightenment-score {
    font-size: 2.8rem;
    margin-bottom: 1rem;
  }

  #diagnosis-comment {
    font-size: 1rem;
    max-width: 90vw;
    margin-bottom: 1rem;
  }

  #clear-stats {
    margin-bottom: 1.5rem;
  }

  #gameover-stage {
    font-size: 1.8rem;
  }

  #gameover-stats {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
  }

  #taunt-box {
    white-space: normal;
    text-align: center;
    max-width: 85vw;
    bottom: 1rem;
    font-size: 0.9rem;
  }
}