:root {
  --bg: #f5f7fa;
  --card-bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --correct-bg: #dcfce7;
  --correct-border: #16a34a;
  --wrong-bg: #fee2e2;
  --wrong-border: #dc2626;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.container { max-width: 760px; margin: 0 auto; padding: 24px 16px 64px; }

.app-header { text-align: center; margin-bottom: 24px; }
.app-header h1 { margin: 0; font-size: 1.6rem; }
.subtitle { color: var(--muted); margin: 4px 0 0; font-size: 0.9rem; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.hidden { display: none; }

.btn {
  display: inline-block;
  border: none;
  border-radius: 8px;
  padding: 12px 24px;
  font-size: 1rem;
  cursor: pointer;
}
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-hover); }

.start-options { margin: 16px 0; }
select {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 1rem;
  margin-left: 8px;
}
/* 出題数の自由入力欄（セレクトと同じ見た目に揃える） */
.count-input {
  width: 90px;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 1rem;
  font-family: inherit;
  margin-left: 8px;
}

.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
}
.domain-tag {
  background: #eef2ff;
  color: #4338ca;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
}

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  margin: 10px 0 18px;
  overflow: hidden;
}
#progress-fill {
  height: 100%;
  background: var(--primary);
  width: 0;
  transition: width 0.3s;
}

#question-text {
  font-size: 1.05rem;
  font-weight: 600;
  white-space: pre-wrap;
}

.choices { display: flex; flex-direction: column; gap: 10px; margin: 18px 0; }
.choice-btn {
  text-align: left;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-size: 0.95rem;
  cursor: pointer;
  line-height: 1.6;
  font-family: inherit;
  color: inherit;
}
.choice-btn:hover:not(:disabled) { border-color: var(--primary); background: #f0f5ff; }
.choice-btn:disabled { cursor: default; opacity: 0.75; }
.choice-btn.correct { background: var(--correct-bg); border-color: var(--correct-border); opacity: 1; }
.choice-btn.wrong { background: var(--wrong-bg); border-color: var(--wrong-border); opacity: 1; }

.feedback { border-top: 1px dashed var(--border); padding-top: 14px; margin-bottom: 16px; }
.result-correct { color: #15803d; font-weight: 700; margin: 0 0 8px; }
.result-wrong { color: #b91c1c; font-weight: 700; margin: 0 0 8px; }
#explanation { margin: 0; font-size: 0.92rem; }

.score { font-size: 1.4rem; font-weight: 700; }

.wrong-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
  font-size: 0.9rem;
}
.wrong-item .q { font-weight: 600; margin: 0 0 6px; }
.wrong-item .a { margin: 0; color: #15803d; }

/* ===== 認証・復習機能 ===== */
.user-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.field { margin: 12px 0; }
.field label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 4px;
}
.field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  box-sizing: border-box;
  font-family: inherit;
}
.field input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
  border-color: var(--primary);
}

.error { color: #b91c1c; font-size: 0.9rem; }

.btn.small { padding: 6px 12px; font-size: 0.8rem; }
.btn.secondary {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn.secondary:hover { background: #f0f5ff; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.secondary:disabled:hover { background: #fff; }

.mode-buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.recent-results { color: var(--muted); font-size: 0.8rem; }
.muted { color: var(--muted); font-size: 0.85rem; }

/* ===== 途中終了・成績一覧 ===== */
.quiz-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 8px;
}

.stats-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.stats-header h2 { margin: 0; }

h3.stats-domain {
  margin: 22px 0 6px;
  font-size: 0.98rem;
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  margin: 4px 0 8px;
  font-size: 0.85rem;
}
.stats-table th,
.stats-table td {
  border-bottom: 1px solid var(--border);
  padding: 8px 6px;
  text-align: left;
  vertical-align: top;
}
.stats-table th {
  color: var(--muted);
  font-weight: 600;
  background: #f9fafb;
}
.stats-table td.no {
  white-space: nowrap;
  color: var(--muted);
}
.stats-table td.marks { white-space: nowrap; }

.mark {
  display: inline-block;
  width: 1.3em;
  text-align: center;
  font-weight: 700;
}
.mark-ok { color: #16a34a; }
.mark-ng { color: #dc2626; }
.mark-none { color: #9ca3af; font-weight: 400; }

/* ===== 成績一覧の個別回答ボタン ===== */
.stats-table td.action {
  white-space: nowrap;
  text-align: right;
}
.stats-table .btn.small {
  padding: 4px 12px;
  font-size: 0.78rem;
}

/* ===== カテゴリータグ・成績一覧コントロール ===== */
.category-tag {
  background: #ecfdf5;
  color: #047857;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
}

.stats-controls {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}
.stats-controls .start-options {
  margin: 8px 0;
}

/* ===== 複数選択問題 ===== */
.multi-notice {
  color: #b45309;
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0 0 4px;
}

.choice-btn.selected {
  border-color: var(--primary);
  background: #e0eaff;
  box-shadow: inset 0 0 0 1px var(--primary);
}
.choice-btn.selected:hover:not(:disabled) {
  background: #d4e2ff;
}

/* ===== アーキテクチャ図 ===== */
.diagram {
  background: #fff;
  border: 1px solid #dbe4f0;
  border-radius: 8px;
  padding: 10px 12px;
  margin: 10px 0 4px;
  overflow-x: auto;
}

.diagram-title {
  margin: 0 0 6px;
  font-size: 0.82rem;
  font-weight: 700;
  color: #475569;
}

.diagram svg,
.diagram img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

/* ===== 解説のみ表示 ===== */
.result-info {
  font-weight: 700;
  color: #2563eb;
}

.stats-table .action {
  white-space: nowrap;
}

.stats-table .action .btn + .btn {
  margin-left: 6px;
}

/* フッター（システム構成ページへのリンク） */
.app-footer {
  text-align: center;
  margin: 28px 0 8px;
  font-size: 0.85rem;
}
.app-footer a { color: var(--muted); }
.app-footer a:hover { color: var(--primary); }