:root {
  --bg: #f6f3ec;
  --surface: #fffdf8;
  --text: #24211c;
  --muted: #6b6559;
  --border: #ddd6c8;
  --accent: #8a3b2a;
  --accent-text: #fffdf8;
  --mark: #f3dd8c;
  --correct: #2f7a4a;
  --wrong: #b23a2e;
  --role-s: #2c5f9e;
  --role-v: #b23a2e;
  --role-o: #2f7a4a;
  --role-c: #9a5a00;
  --role-m: #7a7468;
  --serif: 'Georgia', 'Times New Roman', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1a17;
    --surface: #262420;
    --text: #ece6da;
    --muted: #a59e90;
    --border: #3d3a33;
    --accent: #d98a6c;
    --accent-text: #1b1a17;
    --mark: #6b5a1c;
    --correct: #6cc08b;
    --wrong: #ec7b6e;
    --role-s: #7fb0ec;
    --role-v: #ec7b6e;
    --role-o: #6cc08b;
    --role-c: #e2ad58;
    --role-m: #a59e90;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  padding:
    calc(16px + env(safe-area-inset-top))
    calc(16px + env(safe-area-inset-right))
    calc(32px + env(safe-area-inset-bottom))
    calc(16px + env(safe-area-inset-left));
}

[hidden] { display: none !important; }

.title {
  font-family: var(--serif);
  font-size: 2rem;
  margin: 24px 0 4px;
}

.lead { color: var(--muted); margin: 0 0 24px; }

h2 { font-size: 1.4rem; margin: 8px 0 16px; }
h3 { font-size: 1.1rem; margin: 28px 0 8px; }

.choice-group {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  margin: 0 0 16px;
  background: var(--surface);
}

.choice-group legend { padding: 0 4px; font-weight: 600; }

.choice {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
}

.choice input { width: 20px; height: 20px; margin: 0; accent-color: var(--accent); }

.button {
  display: block;
  width: 100%;
  min-height: 48px;
  margin: 12px 0 0;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.button.danger { color: var(--wrong); }

.button.small {
  display: inline-block;
  width: auto;
  min-height: 44px;
  min-width: 44px;
  margin: 0;
  padding: 8px 14px;
  font-weight: 500;
}

.message { color: var(--wrong); min-height: 1.6em; margin: 8px 0 0; }

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.progress { color: var(--muted); font-variant-numeric: tabular-nums; }

.instruction { font-weight: 600; margin: 0 0 8px; }

.sentence {
  margin: 0;
  padding: 16px;
  background: var(--surface);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.75;
  overflow-wrap: break-word;
}

mark {
  background: var(--mark);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.source { color: var(--muted); font-size: 0.9rem; margin: 8px 0 16px; text-align: right; }

.answer-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* 5つ目のボタンを横幅いっぱいにして、2列の並びに半端な空白を残さない */
.answer-button:last-child { grid-column: 1 / -1; }

.answer-button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 64px;
  padding: 8px;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.answer-button .form { font-family: var(--serif); font-size: 0.95rem; color: var(--muted); font-weight: 400; }
.answer-button:disabled { cursor: default; opacity: 0.55; }
.answer-button.is-correct { border-color: var(--correct); opacity: 1; }
.answer-button.is-wrong { border-color: var(--wrong); opacity: 1; }

.feedback {
  margin-top: 20px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  scroll-margin-top: calc(16px + env(safe-area-inset-top));
}

.feedback p { margin: 0 0 12px; }
.feedback-result { font-weight: 700; font-size: 1.1rem; }
.is-correct.feedback-result { color: var(--correct); }
.is-wrong.feedback-result { color: var(--wrong); }
.feedback-point { font-weight: 600; }
.translation { padding: 8px 12px; border-radius: 6px; background: var(--bg); }
.feedback-note { color: var(--muted); font-size: 0.9rem; }

.parts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 14px;
}

.part {
  display: inline-flex;
  flex-direction: column;
  max-width: 100%;
  border: 1.5px solid var(--role);
  border-radius: 6px;
  overflow: hidden;
}

.part-role {
  padding: 0 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--surface);
  background: var(--role);
}

.part-text { padding: 2px 6px; font-family: var(--serif); overflow-wrap: break-word; }

/* 役割ごとの色を変数で渡し、枠線とラベル背景の両方に同じ色を使う */
.role-s { --role: var(--role-s); }
.role-v { --role: var(--role-v); }
.role-o { --role: var(--role-o); }
.role-c { --role: var(--role-c); }
.role-m { --role: var(--role-m); }

.score { font-size: 1.6rem; font-weight: 700; margin: 0; }

.missed-list, .user-list { list-style: none; margin: 0; padding: 0; }

.missed-list li, .user-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.missed-list p, .user-list p { margin: 0 0 4px; }
.missed-list p[lang], .user-list p[lang] { font-family: var(--serif); }
.missed-detail { color: var(--muted); font-size: 0.9rem; }
.user-list .empty { color: var(--muted); }

.register-form .field {
  display: block;
  margin-bottom: 16px;
  font-weight: 600;
}

.register-form textarea,
.register-form input[type="text"] {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  /* iOS Safari は16px未満の入力欄でフォーカス時に勝手にズームするため */
  font: 400 16px/1.5 var(--sans);
}

.api-settings {
  margin-bottom: 20px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

/* 折りたたみの見出しもタップしやすいよう 44px の高さを確保する */
.api-settings summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  font-weight: 600;
  cursor: pointer;
}

.api-settings .note { color: var(--muted); font-size: 0.9rem; margin: 0 0 12px; }
.api-settings .field { display: block; margin-bottom: 12px; font-weight: 600; }
.api-settings .message { margin-bottom: 12px; }

.api-settings input[type="password"] {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: 400 16px/1.5 var(--sans);
}

#auto-judge-button { margin-bottom: 4px; }
#auto-judge-message { margin-bottom: 16px; }