:root {
  /* サイバーネオン（デフォルトテーマ） */
  --bg-color: #0b0f19;
  --bg-card: rgba(18, 24, 38, 0.92);
  --border-color: rgba(64, 153, 255, 0.28);
  --text-main: #f0f6fc;
  --text-muted: #8b9bb4;
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.4);
  --accent: #4ade80;
  --accent-glow: rgba(74, 222, 128, 0.4);
  --danger: #f87171;
  --danger-glow: rgba(248, 113, 113, 0.4);
  --warning: #fbbf24;
  --box-bg: #151c2c;
  --card-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

[data-theme="pastel"] {
  --bg-color: #fdf8fa;
  --bg-card: rgba(255, 255, 255, 0.95);
  --border-color: rgba(244, 114, 182, 0.4);
  --text-main: #1e293b;
  --text-muted: #64748b;
  --primary: #ec4899;
  --primary-glow: rgba(236, 72, 153, 0.3);
  --accent: #10b981;
  --accent-glow: rgba(16, 185, 129, 0.3);
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.3);
  --warning: #f59e0b;
  --box-bg: #fff1f5;
  --card-shadow: 0 8px 20px rgba(244, 114, 182, 0.15);
}

[data-theme="retro"] {
  --bg-color: #120e24;
  --bg-card: #1c1438;
  --border-color: #ff007f;
  --text-main: #00f0ff;
  --text-muted: #b8a9c9;
  --primary: #ff007f;
  --primary-glow: rgba(255, 0, 127, 0.5);
  --accent: #ffe600;
  --accent-glow: rgba(255, 230, 0, 0.4);
  --danger: #ff3366;
  --danger-glow: rgba(255, 51, 102, 0.5);
  --warning: #ffaa00;
  --box-bg: #0e0920;
  --card-shadow: 0 8px 24px rgba(255, 0, 127, 0.25);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-touch-callout: none;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-color);
  color: var(--text-main);
  overscroll-behavior: none;
}

/* アプリ全体コンテナ：Visual Viewport（キーボードの出現）に合わせて伸縮 */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 500px;
  margin: 0 auto;
  padding: env(safe-area-inset-top, 8px) 12px env(safe-area-inset-bottom, 8px) 12px;
  position: relative;
  overflow: hidden;
  transition: height 0.15s ease-out;
}

/* ヘッダー */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 6px;
  min-height: 42px;
  flex-shrink: 0;
}

.app-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.app-header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 50%;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.95rem;
  transition: transform 0.15s ease;
}

.icon-btn:active {
  transform: scale(0.9);
}

/* ゲーム画面全体 */
.game-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 8px;
  position: relative;
  min-height: 0;
}

/* HUD・ステータスバー */
.game-hud {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 6px 4px;
  backdrop-filter: blur(12px);
  flex-shrink: 0;
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hud-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.hud-value {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
}

.hud-value.highlight {
  color: var(--primary);
}

.hud-value.combo-value {
  color: var(--accent);
}

/* お題単語表示カード */
.word-display-card {
  flex: 1.2;
  min-height: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
}

.word-display-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.kanji-text {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 4px;
  line-height: 1.2;
}

.word-meaning {
  font-size: 0.76rem;
  color: var(--text-muted);
  background: var(--box-bg);
  border: 1px dashed var(--border-color);
  padding: 3px 10px;
  border-radius: 8px;
  margin-bottom: 6px;
  max-width: 95%;
  line-height: 1.25;
}

.kana-stream {
  font-size: 1.55rem;
  font-weight: 900;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  line-height: 1.3;
}

.char-done {
  color: var(--accent);
  opacity: 0.85;
}

.char-current {
  color: var(--primary);
  background: var(--primary-glow);
  padding: 0 4px;
  border-radius: 6px;
  animation: charPulse 0.9s infinite alternate ease-in-out;
  border-bottom: 3px solid var(--primary);
}

.char-current.char-waiting-mod {
  color: var(--warning);
  background: rgba(251, 191, 36, 0.3);
  border-bottom-color: var(--warning);
  animation: charPulseMod 0.6s infinite alternate ease-in-out;
}

@keyframes charPulseMod {
  0% { transform: scale(1); filter: drop-shadow(0 0 4px var(--warning)); }
  100% { transform: scale(1.18); filter: drop-shadow(0 0 14px var(--warning)); }
}

.char-todo {
  color: var(--text-muted);
}

@keyframes charPulse {
  0% { transform: scale(1); filter: drop-shadow(0 0 2px var(--primary)); }
  100% { transform: scale(1.15); filter: drop-shadow(0 0 10px var(--primary)); }
}

/* フリック案内ガイドカード（キーボードのフリック方向を可視化） */
.flick-guide-card {
  background: var(--box-bg);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-shrink: 0;
}

.flick-guide-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.flick-target-char {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--primary);
  background: var(--bg-card);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

.flick-action-info {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.flick-action-title {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
}

.flick-action-detail {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
}

.flick-direction-icon {
  font-size: 1.6rem;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
}

/* 入力エリア（スマホキーボードからの入力を受ける） */
.input-capture-area {
  position: relative;
  width: 100%;
  flex-shrink: 0;
  margin-bottom: 4px;
}

.native-input-field {
  width: 100%;
  height: 52px;
  padding: 0 16px;
  font-size: 1.25rem;
  font-weight: 800;
  text-align: center;
  border-radius: 14px;
  background: var(--box-bg);
  border: 2px solid var(--primary);
  color: var(--text-main);
  outline: none;
  box-shadow: 0 0 16px var(--primary-glow);
  caret-color: var(--primary);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.native-input-field:focus {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.native-input-field.input-error {
  border-color: var(--danger) !important;
  box-shadow: 0 0 20px var(--danger-glow) !important;
  animation: shake 0.3s ease;
}

.tap-to-open-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 4px;
  cursor: pointer;
}

/* 言葉習得演出バナー */
.wisdom-banner {
  position: absolute;
  top: 22%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  font-size: 1.25rem;
  font-weight: 900;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  padding: 6px 18px;
  border-radius: 20px;
  box-shadow: 0 4px 16px var(--accent-glow);
  pointer-events: none;
  opacity: 0;
  transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: 50;
  white-space: nowrap;
}

.wisdom-banner.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.05);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

/* モーダル共通 */
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 12, 20, 0.94);
  backdrop-filter: blur(14px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 22px 18px;
  text-align: center;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-title {
  font-size: 1.45rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.modal-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
  text-align: left;
}

.setting-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.tab-group {
  display: flex;
  gap: 6px;
  width: 100%;
}

.tab-btn {
  flex: 1;
  padding: 9px 4px;
  background: var(--box-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 10px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab-btn.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.start-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  border-radius: 14px;
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 6px 20px var(--accent-glow);
  transition: all 0.15s ease;
}

.start-btn:active {
  transform: scale(0.96);
}

/* リザルト画面 */
.rank-badge {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 0 20px currentColor;
  margin: 6px 0;
}

.rank-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin: 8px 0;
}

.result-box {
  background: var(--box-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 8px;
}

.result-box-label {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.result-box-value {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
}

.action-buttons {
  display: flex;
  gap: 8px;
}

.share-btn {
  flex: 1;
  padding: 12px;
  background: #1d9bf0;
  color: #fff;
  border: none;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
}

/* 今回習得した名言・知恵コレクション（リザルト画面） */
.learned-words-box {
  background: var(--box-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 8px 10px;
  text-align: left;
  max-height: 140px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.learned-words-title {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 4px;
}

.learned-item {
  border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
  padding-bottom: 4px;
}

.learned-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.learned-item-text {
  font-size: 0.84rem;
  font-weight: 800;
  color: var(--text-main);
}

.learned-item-meaning {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.2;
}