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

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  font-family: 'Courier New', monospace;
  position: relative;
  overflow-x: hidden;
}

/* グリッド背景 */
.grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(0, 255, 136, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 136, 0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: gridMove 20s linear infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes gridMove {
  0% { transform: translateY(0); }
  100% { transform: translateY(50px); }
}

@keyframes glow {
  0%, 100% { text-shadow: 0 0 10px #00ff88, 0 0 20px #00ff88, 0 0 30px #00ff88; }
  50% { text-shadow: 0 0 20px #00ff88, 0 0 40px #00ff88, 0 0 60px #00ff88; }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 255, 136, 0.3); }
  50% { box-shadow: 0 0 30px rgba(0, 255, 136, 0.6); }
}

@keyframes slideIn {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.container {
  max-width: 800px;
  width: 100%;
  position: relative;
  z-index: 1;
}

h1 {
  text-align: center;
  font-size: 28px;
  color: #00ff88;
  margin-bottom: 30px;
  letter-spacing: 4px;
  animation: glow 2s infinite;
  text-transform: uppercase;
}

/* 画面共通 */
.screen {
  display: none;
  animation: slideIn 0.5s ease-out;
}

.screen.active {
  display: block;
}

/* ボタン */
.btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: 3px solid #00ff88;
  color: #fff;
  padding: 15px 40px;
  font-size: 16px;
  font-family: 'Courier New', monospace;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.6);
  border-color: #ff0066;
}

.btn:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(0, 0, 0, 0.5);
  border-color: #ff0066;
}

/* 入力フィールド */
.game-input {
  background: rgba(0, 0, 0, 0.6);
  border: 3px solid #00ff88;
  color: #00ff88;
  padding: 18px;
  font-size: 24px;
  font-family: 'Courier New', monospace;
  width: 100%;
  text-align: center;
  outline: none;
  animation: pulse 2s infinite;
  letter-spacing: 2px;
}

.game-input:focus {
  border-color: #ff0066;
  box-shadow: 0 0 30px rgba(255, 0, 102, 0.5);
}

.game-input::placeholder {
  color: rgba(0, 255, 136, 0.4);
}

/* ステータスカード */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 25px;
}

.stat-card {
  background: rgba(0, 0, 0, 0.6);
  border: 2px solid #00ff88;
  padding: 12px 8px;
  text-align: center;
  box-shadow: 0 0 15px rgba(0, 255, 136, 0.2);
}

.stat-label {
  color: #00ff88;
  font-size: 11px;
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.stat-value {
  color: #fff;
  font-size: 22px;
  font-weight: bold;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.stat-value.warning { color: #ff0066; }
.stat-value.highlight { color: #ff0066; text-shadow: 0 0 10px #ff0066; }
.stat-value.good { color: #00ff88; }
.stat-value.mid { color: #ffaa00; }

/* 単語表示エリア */
.word-display {
  background: rgba(0, 0, 0, 0.8);
  border: 3px solid #00ff88;
  padding: 35px 25px;
  margin-bottom: 20px;
  text-align: center;
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
}

.kanji {
  font-size: 52px;
  color: #fff;
  margin-bottom: 15px;
  font-weight: bold;
  letter-spacing: 6px;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.hiragana {
  font-size: 26px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 25px;
  letter-spacing: 3px;
}

.romaji {
  font-size: 30px;
  letter-spacing: 5px;
  padding-top: 20px;
  border-top: 2px solid rgba(0, 255, 136, 0.3);
}

.char-pending { color: rgba(255, 255, 255, 0.3); }
.char-correct { color: #00ff88; text-shadow: 0 0 10px #00ff88; }
.char-wrong { color: #ff0066; text-shadow: 0 0 10px #ff0066; }

/* ローディング・エラー */
.loading-text {
  text-align: center;
  color: #00ff88;
  font-size: 18px;
  padding: 50px;
}

.error-box {
  background: rgba(255, 0, 102, 0.1);
  border: 2px solid #ff0066;
  padding: 30px;
  text-align: center;
  box-shadow: 0 0 20px rgba(255, 0, 102, 0.3);
}

.error-msg {
  color: #ff0066;
  font-size: 16px;
  margin-bottom: 15px;
}

.error-hint {
  color: rgba(255, 255, 255, 0.6);
  font-size: 13px;
  margin-bottom: 20px;
}

/* スタート画面 */
.intro-text {
  color: #fff;
  font-size: 16px;
  line-height: 2;
  margin-bottom: 30px;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.8);
}

.word-count {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* 結果画面 */
.result-box {
  background: rgba(0, 0, 0, 0.8);
  border: 3px solid #ff0066;
  padding: 35px;
  margin-bottom: 25px;
  box-shadow: 0 0 30px rgba(255, 0, 102, 0.5);
}

.result-title {
  color: #ff0066;
  font-size: 28px;
  margin-bottom: 30px;
  text-shadow: 0 0 15px #ff0066;
  letter-spacing: 3px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.result-item {
  text-align: center;
}

.result-label {
  color: #00ff88;
  font-size: 12px;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.result-value {
  color: #fff;
  font-size: 28px;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.result-value.big {
  font-size: 38px;
}

/* スコアコード */
.code-box {
  background: rgba(0, 255, 136, 0.1);
  border: 2px solid #00ff88;
  padding: 25px;
  margin-top: 25px;
  text-align: center;
}

.code-label {
  color: #00ff88;
  font-size: 13px;
  margin-bottom: 12px;
}

.code-value {
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(0, 255, 136, 0.3);
  color: #fff;
  font-size: 42px;
  font-weight: bold;
  letter-spacing: 10px;
  padding: 18px;
  margin-bottom: 15px;
  text-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
}

.copy-btn {
  background: rgba(0, 255, 136, 0.2);
  border: 2px solid #00ff88;
  color: #00ff88;
  padding: 10px 25px;
  font-size: 13px;
  font-family: 'Courier New', monospace;
  cursor: pointer;
  transition: all 0.3s;
  letter-spacing: 1px;
}

.copy-btn:hover {
  background: rgba(0, 255, 136, 0.4);
}

.code-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.report-btn {
  background: rgba(255, 0, 102, 0.2);
  border-color: #ff0066;
  color: #ff0066;
}

.report-btn:hover {
  background: rgba(255, 0, 102, 0.4);
}

.code-hint {
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  margin-top: 12px;
}

.result-msg {
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid rgba(0, 255, 136, 0.3);
  padding: 15px;
  margin-top: 20px;
  font-size: 16px;
  color: #fff;
}

.center { text-align: center; }

/* スタート画面レイアウト */
#start.active {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#game.active, #result.active {
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
}

#game.active {
  position: relative;
}

/* レベル選択ボタン */
.level-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 10px;
  max-width: 520px;
}

.level-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 8px;
  font-size: 20px;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.5);
  border: 3px solid;
  transition: all 0.3s;
  text-shadow: 0 0 8px currentColor;
}

.level-sub {
  display: block;
  font-size: 13px;
  font-weight: 600;
  opacity: 0.9;
  margin-top: 4px;
}

.level-count {
  display: block;
  font-size: 10px;
  font-weight: 400;
  opacity: 0.7;
  margin-top: 2px;
}

.level-1 { border-color: #00ff88; color: #00ff88; }
.level-1:hover { background: rgba(0, 255, 136, 0.2); box-shadow: 0 0 20px rgba(0, 255, 136, 0.5); }
.level-2 { border-color: #00d4ff; color: #00d4ff; }
.level-2:hover { background: rgba(0, 212, 255, 0.2); box-shadow: 0 0 20px rgba(0, 212, 255, 0.5); }
.level-3 { border-color: #667eea; color: #99aaff; }
.level-3:hover { background: rgba(102, 126, 234, 0.2); box-shadow: 0 0 20px rgba(102, 126, 234, 0.5); }
.level-4 { border-color: #ffaa00; color: #ffaa00; }
.level-4:hover { background: rgba(255, 170, 0, 0.2); box-shadow: 0 0 20px rgba(255, 170, 0, 0.5); }
.level-5 { border-color: #ff0066; color: #ff0066; }
.level-5:hover { background: rgba(255, 0, 102, 0.2); box-shadow: 0 0 20px rgba(255, 0, 102, 0.5); }
.level-6 { border-color: #cc44ff; color: #cc44ff; }
.level-6:hover { background: rgba(204, 68, 255, 0.2); box-shadow: 0 0 20px rgba(204, 68, 255, 0.5); }

/* カウントダウンオーバーレイ */
.countdown-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.countdown-number {
  font-size: 120px;
  font-weight: 700;
  color: #00ff88;
  text-shadow: 0 0 30px #00ff88, 0 0 60px #00ff88;
}

/* ゲーム中ボタン */
.game-buttons {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-bottom: 12px;
}

.btn-small {
  padding: 8px 20px;
  font-size: 14px;
}

.btn-secondary {
  background: rgba(0, 0, 0, 0.5);
  border: 2px solid #ff0066;
}

.btn-secondary:hover {
  background: rgba(255, 0, 102, 0.2);
}

/* 遊び方ボタン */
.btn-howto {
  margin-top: 24px;
  background: rgba(0, 0, 0, 0.5);
  border: 2px solid #00ff88;
  padding: 10px 32px;
  font-size: 15px;
}

.btn-howto:hover {
  background: rgba(0, 255, 136, 0.2);
}

/* 遊び方画面 */
#howtoplay.active {
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
}

.howto-content {
  background: rgba(0, 0, 0, 0.8);
  border: 3px solid #00ff88;
  padding: 32px;
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
}

.howto-content h1 {
  margin-bottom: 24px;
}

.howto-section {
  margin-bottom: 24px;
}

.howto-section h2 {
  font-size: 18px;
  color: #00ff88;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 2px solid #00ff88;
}

.howto-section p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.8;
}

.howto-formula {
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid rgba(0, 255, 136, 0.3);
  padding: 12px;
  text-align: center;
  font-weight: 700;
  font-size: 16px !important;
  color: #fff !important;
  margin: 8px 0;
}

.howto-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}

.howto-table tr {
  border-bottom: 1px solid rgba(0, 255, 136, 0.2);
}

.howto-table tr:last-child {
  border-bottom: none;
}

.howto-table td {
  padding: 10px 12px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
}

.howto-lv {
  font-weight: 700;
  color: #fff;
  border-radius: 6px;
  text-align: center;
  width: 56px;
}

.lv-color-1 { background: rgba(0, 255, 136, 0.3); color: #00ff88; border: 1px solid #00ff88; }
.lv-color-2 { background: rgba(0, 212, 255, 0.3); color: #00d4ff; border: 1px solid #00d4ff; }
.lv-color-3 { background: rgba(102, 126, 234, 0.3); color: #99aaff; border: 1px solid #667eea; }
.lv-color-4 { background: rgba(255, 170, 0, 0.3); color: #ffaa00; border: 1px solid #ffaa00; }
.lv-color-5 { background: rgba(255, 0, 102, 0.3); color: #ff0066; border: 1px solid #ff0066; }
.lv-color-6 { background: rgba(204, 68, 255, 0.3); color: #cc44ff; border: 1px solid #cc44ff; }

/* 漢字サイズ調整 */
.kanji.text-md { font-size: 36px; }
.kanji.text-sm { font-size: 28px; }

/* 長文スクロール対応 */
.hiragana {
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.hiragana::-webkit-scrollbar { display: none; }

.romaji {
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.romaji::-webkit-scrollbar { display: none; }

/* レスポンシブ */
@media (max-width: 600px) {
  h1 { font-size: 22px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .result-grid { grid-template-columns: 1fr; }
  .kanji { font-size: 40px; }
  .romaji { font-size: 24px; }
  .code-value { font-size: 32px; letter-spacing: 6px; }
  .level-buttons { grid-template-columns: repeat(2, 1fr); gap: 8px; max-width: 360px; }
  .level-btn { font-size: 16px; padding: 10px 6px; }
}