/* ===== リセット・基本設定 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== ダークテーマ（デフォルト） ===== */
:root,
[data-theme="dark"] {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(255, 255, 255, 0.06);
  --bg-card-solid: #1e1e32;
  --bg-hover: rgba(255, 255, 255, 0.1);

  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a80;

  --accent: #7c5cfc;
  --accent-light: #9b82fc;
  --accent-hover: #6a48e0;
  --accent-glow: rgba(124, 92, 252, 0.3);

  --gradient-accent: linear-gradient(135deg, #7c5cfc 0%, #00c6fb 100%);
  --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-cool: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-gold: linear-gradient(135deg, #f6d365 0%, #fda085 100%);

  --correct: #34d399;
  --correct-bg: rgba(52, 211, 153, 0.12);
  --incorrect: #f87171;
  --incorrect-bg: rgba(248, 113, 113, 0.12);
  --warning: #fbbf24;

  --border: rgba(255, 255, 255, 0.1);
  --border-light: rgba(255, 255, 255, 0.06);

  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(16px);

  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(124, 92, 252, 0.15);

  --radius: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-main: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Meiryo", sans-serif;
  --font-mono: "SF Mono", "Monaco", "Menlo", monospace;

  color-scheme: dark;
}

/* ===== ライトテーマ ===== */
[data-theme="light"] {
  --bg-primary: #f0f0f8;
  --bg-secondary: #e4e4f0;
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-card-solid: #ffffff;
  --bg-hover: rgba(124, 92, 252, 0.06);

  --text-primary: #1a1a2e;
  --text-secondary: #4a4a60;
  --text-muted: #8a8a9e;

  --accent: #6c4ce0;
  --accent-light: #8b6cf0;
  --accent-hover: #5a3cc8;
  --accent-glow: rgba(108, 76, 224, 0.2);

  --correct: #16a34a;
  --correct-bg: rgba(22, 163, 74, 0.1);
  --incorrect: #dc2626;
  --incorrect-bg: rgba(220, 38, 38, 0.1);
  --warning: #d97706;

  --border: rgba(0, 0, 0, 0.1);
  --border-light: rgba(0, 0, 0, 0.05);

  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.8);
  --glass-blur: blur(16px);

  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(108, 76, 224, 0.1);

  color-scheme: light;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* ===== テーマトグル ===== */
.theme-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 50;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  transform: scale(1.1);
}

/* ===== ガラスモーフィズム ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
}

/* ===== 画面制御 ===== */
.screen {
  display: none;
  max-width: 800px;
  margin: 0 auto;
  padding: 24px;
  min-height: 100vh;
}

.screen.active {
  display: block;
  animation: screenIn 0.4s ease;
}

.hidden {
  display: none !important;
}

@keyframes screenIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== ヘッダー ===== */
.app-header {
  text-align: center;
  padding: 40px 0 28px;
}

.logo-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 6px;
}

.logo-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 4px 16px rgba(124, 92, 252, 0.4);
}

.app-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ===== ホーム画面 ===== */
.home-main {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.select-section {
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  transition: all 0.3s ease;
}

.select-section:hover {
  box-shadow: var(--shadow-glow);
}

.select-section h2 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 10px;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.select-btn {
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all 0.25s ease;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

.select-btn:hover {
  border-color: var(--accent-light);
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.select-btn.selected {
  border-color: transparent;
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
  transform: translateY(-1px);
}

.subj-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--bg-hover);
  font-size: 0.75rem;
  font-weight: 700;
}

.select-btn.selected .subj-icon {
  background: rgba(255, 255, 255, 0.25);
}

/* ===== ボタン共通 ===== */
.btn-primary {
  display: block;
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius);
  background: var(--gradient-accent);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all 0.3s ease;
  letter-spacing: 0.03em;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  background: var(--border);
  color: var(--text-muted);
  cursor: not-allowed;
  box-shadow: none;
}

.btn-glow:not(:disabled) {
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-secondary {
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent-light);
  background: var(--bg-hover);
}

.btn-secondary:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.5;
}

/* ===== テスト画面 ===== */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-radius: var(--radius-lg);
  margin-bottom: 8px;
  position: sticky;
  top: 12px;
  z-index: 10;
}

.quiz-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

#quiz-label {
  font-weight: 600;
  font-size: 0.9rem;
}

#quiz-progress {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.quiz-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ストリーク表示 */
.streak-display {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: var(--radius);
  background: var(--gradient-warm);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  animation: streakPop 0.3s ease;
}

.streak-display.hidden {
  display: none !important;
}

@keyframes streakPop {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); opacity: 1; }
}

#streak-count {
  font-size: 1.1rem;
  font-weight: 800;
}

.streak-label {
  font-size: 0.7rem;
  opacity: 0.9;
}

.quiz-timer {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-hover);
  padding: 6px 14px;
  border-radius: var(--radius);
}

.quiz-timer.warning {
  color: var(--incorrect);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ===== 進捗バー ===== */
.progress-bar-wrap {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-bottom: 16px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* ===== 文章読解エリア ===== */
.reading-passage {
  border-radius: var(--radius-lg);
  padding: 22px 26px;
  margin-bottom: 16px;
  border-left: 3px solid var(--accent);
  max-height: 400px;
  overflow-y: auto;
  line-height: 2;
  font-size: 0.93rem;
}

.reading-passage h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--accent-light);
}

.reading-passage .passage-text {
  white-space: pre-wrap;
}

.reading-passage .passage-note {
  margin-top: 10px;
  font-size: 0.83rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
  padding-top: 8px;
}

/* ===== 問題カード ===== */
.quiz-container {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.question-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  animation: fadeIn 0.35s ease;
}

.question-number {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  padding: 3px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.question-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 16px;
  line-height: 1.8;
}

/* ===== 選択肢 ===== */
.choices {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.choice-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-primary);
  font-size: 0.93rem;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  line-height: 1.6;
}

.choice-btn:hover {
  border-color: var(--accent-light);
  background: var(--bg-hover);
  transform: translateX(4px);
}

.choice-btn.selected {
  border-color: var(--accent);
  background: var(--accent-glow);
  box-shadow: 0 0 16px var(--accent-glow);
}

.choice-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--bg-hover);
  font-weight: 600;
  font-size: 0.82rem;
  flex-shrink: 0;
  transition: all 0.2s;
}

.choice-btn.selected .choice-label {
  background: var(--accent);
  color: #fff;
}

.choice-text {
  padding-top: 2px;
}

/* ===== 入力（計算問題用） ===== */
.input-answer {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

.input-answer input {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1.1rem;
  font-family: var(--font-mono);
  background: var(--bg-hover);
  color: var(--text-primary);
  width: 220px;
  transition: all 0.3s;
}

.input-answer input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
}

.input-answer .unit {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===== テストフッター ===== */
.quiz-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  border-radius: var(--radius-lg);
  margin-top: 16px;
  position: sticky;
  bottom: 12px;
}

#answer-count {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.quiz-footer .btn-primary {
  width: auto;
  padding: 10px 24px;
  font-size: 0.9rem;
}

/* ===== 結果画面 ===== */
.result-main {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-bottom: 40px;
}

.score-card {
  text-align: center;
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  box-shadow: var(--shadow-lg);
}

/* スコアリング（SVG円グラフ） */
.score-ring {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0 auto 20px;
}

.score-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.score-ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 8;
}

.score-ring-fill {
  fill: none;
  stroke: url(#scoreGradient);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 326.7;
  stroke-dashoffset: 326.7;
  transition: stroke-dashoffset 1.2s ease;
}

.score-ring-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

#score-number {
  display: block;
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-unit {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
}

#score-detail {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

#score-time {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== ランク表示 ===== */
.score-rank {
  text-align: center;
  padding: 20px;
  border-radius: var(--radius-lg);
  font-weight: 600;
}

.rank-icon {
  display: block;
  font-size: 2.5rem;
  margin-bottom: 8px;
}

.rank-text {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.rank-desc {
  font-size: 0.9rem;
  opacity: 0.8;
}

.score-rank.rank-s {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.15), rgba(245, 158, 11, 0.08));
  color: var(--warning);
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.score-rank.rank-a {
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.15), rgba(16, 185, 129, 0.08));
  color: var(--correct);
  border: 1px solid rgba(52, 211, 153, 0.3);
}

.score-rank.rank-b {
  background: linear-gradient(135deg, rgba(124, 92, 252, 0.15), rgba(99, 102, 241, 0.08));
  color: var(--accent-light);
  border: 1px solid rgba(124, 92, 252, 0.3);
}

.score-rank.rank-c {
  background: linear-gradient(135deg, rgba(248, 113, 113, 0.15), rgba(239, 68, 68, 0.08));
  color: var(--incorrect);
  border: 1px solid rgba(248, 113, 113, 0.3);
}

/* ===== 結果レビュー ===== */
.result-review {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.review-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 14px 18px;
  border-left: 3px solid var(--border);
  transition: all 0.2s;
}

.review-item:hover {
  background: var(--bg-hover);
}

.review-item.is-correct {
  border-left-color: var(--correct);
}

.review-item.is-incorrect {
  border-left-color: var(--incorrect);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.review-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 20px;
  color: #fff;
}

.review-badge.correct {
  background: var(--correct);
}

.review-badge.incorrect {
  background: var(--incorrect);
}

.review-question {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.review-body {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.review-body .your-answer {
  color: var(--incorrect);
}

.review-body .correct-answer {
  color: var(--correct);
  font-weight: 600;
}

.review-explanation {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: var(--bg-hover);
  padding: 8px 12px;
  border-radius: 8px;
}

/* ===== 結果アクション ===== */
.result-actions {
  display: flex;
  gap: 12px;
}

.result-actions .btn-secondary,
.result-actions .btn-primary {
  flex: 1;
  text-align: center;
}

.result-actions .btn-primary {
  width: auto;
}

/* ===== タイムアタック専用 ===== */
.timeattack-display {
  text-align: center;
  padding: 28px 20px;
}

.timeattack-problem {
  font-size: 2.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-bottom: 24px;
  color: var(--text-primary);
}

.timeattack-input {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.timeattack-input input {
  padding: 14px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1.5rem;
  font-family: var(--font-mono);
  text-align: center;
  width: 200px;
  background: var(--bg-hover);
  color: var(--text-primary);
  transition: all 0.3s;
}

.timeattack-input input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.timeattack-feedback {
  margin-top: 20px;
  font-size: 1.2rem;
  font-weight: 600;
  min-height: 2em;
}

.timeattack-feedback.correct {
  color: var(--correct);
}

.timeattack-feedback.incorrect {
  color: var(--incorrect);
}

/* ===== 確認ダイアログ ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s ease;
}

.modal-box {
  background: var(--bg-card-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.modal-box h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.modal-box p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.modal-actions button {
  min-width: 100px;
}

/* ===== スクロールバー ===== */
::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== フッター ===== */
.app-footer {
  text-align: center;
  padding: 24px 0 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===== アニメーション ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-card {
  animation: fadeIn 0.35s ease;
}

/* ===== SVGグラデーション定義用（JSで動的に追加） ===== */