:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1c2733;
  --muted: #5f7081;
  --primary: #1565c0;
  --primary-dark: #0d47a1;
  --correct: #2e7d32;
  --correct-bg: #e8f5e9;
  --wrong: #c62828;
  --wrong-bg: #ffebee;
  --warn-bg: #fff8e1;
  --warn-border: #f9a825;
  --border: #dde3e9;
  --radius: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  padding-bottom: 70px; /* bottom nav分 */
}
.topbar {
  background: var(--primary);
  padding: 10px 16px;
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
}
.brand { color: #fff; font-weight: bold; text-decoration: none; font-size: 1.05rem; }
.profile-chip {
  color: #fff; text-decoration: none; font-size: 0.8rem;
  background: rgba(255,255,255,0.2); padding: 4px 12px; border-radius: 999px;
  white-space: nowrap;
}
.container { max-width: 760px; margin: 0 auto; padding: 14px; }

.bottomnav {
  position: fixed; bottom: 0; left: 0; right: 0;
  display: flex; background: var(--card);
  border-top: 1px solid var(--border); z-index: 10;
  padding-bottom: env(safe-area-inset-bottom);
}
.bottomnav a {
  flex: 1; text-align: center; padding: 7px 0 5px;
  text-decoration: none; color: var(--muted); font-size: 1.15rem; line-height: 1.2;
}
.bottomnav a span { display: block; font-size: 0.65rem; }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; margin-bottom: 14px;
}
h1 { font-size: 1.25rem; margin: 8px 0 12px; }
h2 { font-size: 1.05rem; margin: 4px 0 10px; }
.muted { color: var(--muted); font-size: 0.85rem; }

/* ホームのモードボタン */
.mode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mode-btn {
  display: block; text-align: center; text-decoration: none;
  background: var(--card); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 8px; font-weight: bold; font-size: 0.95rem;
}
.mode-btn .sub { display: block; font-weight: normal; font-size: 0.72rem; color: var(--muted); }
.mode-btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); grid-column: 1 / -1; padding: 18px; font-size: 1.1rem; }
.mode-btn.primary .sub { color: #cfe3f7; }

.stat-row { display: flex; gap: 10px; }
.stat { flex: 1; text-align: center; }
.stat .num { font-size: 1.5rem; font-weight: bold; color: var(--primary); }
.stat .label { font-size: 0.72rem; color: var(--muted); }

/* バッジ */
.badge {
  display: inline-block; font-size: 0.7rem; padding: 2px 8px;
  border-radius: 999px; margin-right: 4px; vertical-align: middle;
}
.badge.review { background: var(--warn-bg); color: #8a6d00; border: 1px solid var(--warn-border); }
.badge.cat { background: #e3f2fd; color: var(--primary-dark); }
.badge.session { background: #ede7f6; color: #4527a0; }
.badge.ok { background: var(--correct-bg); color: var(--correct); }

/* 問題画面 */
.study-card { padding: 12px; }
.question-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; margin-bottom: 8px; }
.question-panel {
  background: #f8fbff;
  border: 1px solid #cfddea;
  border-radius: 10px;
  margin: 8px 0 12px;
  padding: 12px;
}
.question-label {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: bold;
  letter-spacing: 0;
  margin-bottom: 4px;
}
.question-text { font-size: 1rem; white-space: pre-wrap; margin: 0; overflow-wrap: anywhere; }
.choices { display: flex; flex-direction: column; gap: 10px; }
.choice-btn {
  display: flex; align-items: flex-start; gap: 10px; width: 100%;
  text-align: left; background: var(--card);
  border: 2px solid var(--border); border-radius: var(--radius);
  padding: 14px 12px; font-size: 0.95rem; line-height: 1.6;
  cursor: pointer; font-family: inherit; color: var(--text);
}
.choice-btn .n {
  flex: 0 0 28px; height: 28px; border-radius: 50%;
  background: var(--bg); display: flex; align-items: center; justify-content: center;
  font-weight: bold; font-size: 0.9rem;
}
.choice-btn:active { background: #eef3f8; }
.choice-btn:focus-visible, .btn:focus-visible, .exam-nav button:focus-visible {
  outline: 3px solid rgba(21,101,192,0.28);
  outline-offset: 2px;
}
.choice-btn:disabled { cursor: default; opacity: 1; }
.choice-btn.correct { border-color: var(--correct); background: var(--correct-bg); }
.choice-btn.correct .n { background: var(--correct); color: #fff; }
.choice-btn.wrong { border-color: var(--wrong); background: var(--wrong-bg); }
.choice-btn.wrong .n { background: var(--wrong); color: #fff; }
.choice-btn.dim { opacity: 0.55; }

.answer-panel { scroll-margin-top: 92px; }
.answer-summary {
  border-top: 1px solid var(--border);
  margin-top: 14px;
  padding-top: 12px;
}
.verdict { font-size: 1.3rem; font-weight: bold; margin: 0 0 4px; }
.verdict.correct { color: var(--correct); }
.verdict.wrong { color: var(--wrong); }
.mini-link {
  display: inline-block;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: bold;
  text-decoration: none;
  margin-top: 2px;
}

.notice {
  background: var(--warn-bg); border: 1px solid var(--warn-border);
  border-radius: 8px; padding: 10px 12px; font-size: 0.82rem; margin: 10px 0;
}
.explanation-panel { margin-top: 12px; }
.explanation { white-space: pre-wrap; font-size: 0.95rem; overflow-wrap: anywhere; }
.inline-review {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-top: 12px;
  padding: 10px 12px;
  background: #fbfcfd;
}
.inline-review summary {
  color: var(--primary);
  cursor: pointer;
  font-weight: bold;
  font-size: 0.9rem;
}
.inline-review .question-text { margin-top: 8px; font-size: 0.92rem; }
.source-line { font-size: 0.75rem; color: var(--muted); margin-top: 10px; }
.source-line a { color: var(--primary); }

.btn {
  display: inline-block; background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius); padding: 14px 22px;
  font-size: 1rem; font-weight: bold; text-decoration: none;
  cursor: pointer; font-family: inherit;
}
.btn.block { display: block; width: 100%; text-align: center; }
.btn.secondary { background: var(--card); color: var(--primary); border: 2px solid var(--primary); }
.btn.gray { background: var(--muted); }
.btn:disabled { opacity: 0.48; cursor: default; }

/* 表 */
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { padding: 8px 6px; border-bottom: 1px solid var(--border); text-align: left; }
th { color: var(--muted); font-weight: normal; font-size: 0.75rem; }
td.num, th.num { text-align: right; }
.acc-good { color: var(--correct); font-weight: bold; }
.acc-bad { color: var(--wrong); font-weight: bold; }

/* 管理画面 */
.filterbar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.filterbar select, .filterbar input[type=text] {
  padding: 8px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 0.85rem; flex: 1; min-width: 130px; font-family: inherit;
}
.qlist-item {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px 12px; margin-bottom: 8px;
  text-decoration: none; color: var(--text); font-size: 0.85rem;
}
form.edit label { display: block; font-size: 0.8rem; color: var(--muted); margin: 12px 0 4px; }
form.edit textarea, form.edit input[type=text], form.edit select {
  width: 100%; padding: 10px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 0.9rem; font-family: inherit;
}
form.edit textarea { min-height: 90px; }
form.edit textarea.small { min-height: 56px; }

/* 模試 */
.exam-header {
  display: flex; justify-content: space-between; align-items: center;
  position: sticky; top: 48px; background: var(--bg); padding: 6px 0; z-index: 5;
  gap: 12px;
}
.timer { font-weight: bold; font-size: 1.1rem; color: var(--primary-dark); }
.timer.low { color: var(--wrong); }
.progress-track {
  width: min(42vw, 260px);
  height: 5px;
  background: #dfe8f1;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 4px;
}
.progress-track span {
  display: block;
  height: 100%;
  background: var(--primary);
}
.exam-nav-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 8px 0 12px;
}
.exam-nav-wrap summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: bold;
  padding: 10px 12px;
  list-style-position: inside;
}
.exam-nav { display: flex; flex-wrap: wrap; gap: 5px; margin: 10px 0; }
.exam-nav-wrap .exam-nav { margin: 0; padding: 0 10px 10px; }
.exam-nav button {
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--card); cursor: pointer; font-size: 0.75rem; font-family: inherit;
}
.exam-nav button.answered { background: #e3f2fd; border-color: var(--primary); }
.exam-nav button.current { background: var(--primary); color: #fff; }
.answer-actions { display: flex; gap: 8px; margin-top: 14px; }
.result-banner { text-align: center; padding: 18px; border-radius: var(--radius); margin-bottom: 14px; }
.result-banner.pass { background: var(--correct-bg); color: var(--correct); }
.result-banner.fail { background: var(--wrong-bg); color: var(--wrong); }
.result-banner .big { font-size: 1.6rem; font-weight: bold; }
.result-overview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  text-align: center;
}
.result-stat {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 6px;
  background: #fbfcfd;
}
.result-stat span {
  display: block;
  color: var(--primary-dark);
  font-weight: bold;
  font-size: 1.25rem;
  line-height: 1.2;
}
.result-stat small { color: var(--muted); font-size: 0.72rem; }
.review-list { display: grid; gap: 8px; }

@media (max-width: 640px) {
  body { padding-bottom: 76px; }
  .topbar { padding: 8px 10px; }
  .brand { font-size: 0.95rem; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .profile-chip { max-width: 38vw; overflow: hidden; text-overflow: ellipsis; }
  .container { padding: 10px; }
  .card { border-radius: 10px; padding: 12px; }
  h1 { font-size: 1.12rem; margin-top: 4px; }
  .question-panel {
    position: sticky;
    top: 50px;
    z-index: 4;
    max-height: 34svh;
    overflow: auto;
    box-shadow: 0 6px 14px rgba(28,39,51,0.08);
  }
  .choice-btn { padding: 13px 10px; font-size: 0.94rem; }
  .choice-btn .n { flex-basis: 30px; width: 30px; height: 30px; }
  .exam-header { top: 42px; }
  .progress-track { width: 46vw; }
  .bottomnav a { font-size: 1rem; padding-top: 6px; }
  .bottomnav a span { font-size: 0.58rem; }
}

/* Learning-flow improvements */
body { padding-bottom: 92px; }
.choice-btn:focus-visible, .btn:focus-visible, .exam-nav button:focus-visible, .mark-btn:focus-visible {
  outline: 3px solid rgba(21,101,192,0.28);
  outline-offset: 2px;
}
.sticky-next {
  position: sticky;
  bottom: calc(64px + env(safe-area-inset-bottom));
  z-index: 8;
  margin: 10px 0 12px;
  box-shadow: 0 8px 18px rgba(13,71,161,0.24);
}
.choice-review {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-top: 12px;
  padding: 10px 12px;
  background: #fbfcfd;
}
.choice-review summary {
  color: var(--primary);
  cursor: pointer;
  font-weight: bold;
  font-size: 0.9rem;
}
.choice-review ol {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.choice-review li {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  gap: 8px;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px;
  background: #fff;
}
.choice-review li.correct { border-color: var(--correct); background: var(--correct-bg); }
.choice-review li.wrong { border-color: var(--wrong); background: var(--wrong-bg); }
.choice-review-number {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--bg);
  font-weight: bold;
}
.choice-review-text { overflow-wrap: anywhere; }
.choice-review-labels { white-space: nowrap; }
.result-card { text-align: center; }
.exam-nav-legend {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 0 12px 8px;
}
.exam-nav-legend span { display: inline-flex; align-items: center; gap: 4px; }
.legend {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  border: 1px solid var(--border);
}
.legend.answered { background: #e3f2fd; border-color: var(--primary); }
.legend.marked { background: var(--warn-bg); border-color: var(--warn-border); }
.exam-nav button {
  position: relative;
  width: 36px;
  height: 36px;
}
.exam-nav button.marked {
  background: var(--warn-bg);
  border-color: var(--warn-border);
  color: #6f5600;
  font-weight: bold;
}
.exam-nav button span {
  position: absolute;
  top: -7px;
  right: -4px;
  font-size: 0.65rem;
  line-height: 1;
  color: #8a6d00;
}
.exam-nav button.current span { color: #fff; }
.mark-btn {
  margin-left: auto;
  border: 1px solid var(--warn-border);
  border-radius: 999px;
  background: var(--warn-bg);
  color: #6f5600;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: bold;
  padding: 5px 10px;
}
.mark-btn.active {
  background: #ffecb3;
  border-color: #f57f17;
}
.result-overview { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
.choice-btn.selected {
  border-color: var(--primary);
  background: #eaf3ff;
}
.choice-btn.selected .n {
  background: var(--primary);
  color: #fff;
}
.answer-submit {
  margin: 12px 0 4px;
}
.answer-submit:disabled {
  background: #9aa8b5;
  box-shadow: none;
}

@media (max-width: 640px) {
  body { padding-bottom: 96px; }
  .choice-review li { grid-template-columns: 30px 1fr; }
  .choice-review-labels { grid-column: 2; }
  .sticky-next { bottom: calc(58px + env(safe-area-inset-bottom)); }
  .mark-btn { width: 100%; margin: 4px 0 0; text-align: center; }
}

/* 回答後は問題文の固定を解除し、正誤判定がヘッダーに隠れないようにする */
.question-panel.unstick { position: static; max-height: none; overflow: visible; box-shadow: none; }

/* 出題ヘッダーの正誤タリー */
.quiz-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.tally { font-size: 0.85rem; font-weight: bold; white-space: nowrap; }
.tally .t-ok { color: var(--correct); }
.tally .t-ng { color: var(--wrong); }
.choice-review-labels .mk, .choice-review li .mk { font-size: 0.72rem; font-weight: bold; color: var(--muted); }

/* セッション結果・間違いリスト */
.recap-row { font-size: 0.85rem; line-height: 1.5; border-left: 4px solid var(--border); }
.recap-row.ok { border-left-color: var(--correct); }
.recap-row.ng { border-left-color: var(--wrong); }
.recap-mark { font-weight: bold; margin-right: 4px; }
.recap-row.ok .recap-mark { color: var(--correct); }
.recap-row.ng .recap-mark { color: var(--wrong); }

.floating-answer.is-ready {
  position: fixed;
  left: max(10px, calc((100vw - 760px) / 2 + 14px));
  right: max(10px, calc((100vw - 760px) / 2 + 14px));
  bottom: calc(72px + env(safe-area-inset-bottom));
  z-index: 20;
  box-shadow: 0 8px 20px rgba(13,71,161,0.26);
}

/* 模試の解答一覧グリッド(○×) */
.rgrid-wrap { display: flex; flex-wrap: wrap; gap: 6px; }
.rgrid {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 7px; font-size: 0.78rem; font-weight: bold;
}
.rgrid.ok { background: var(--correct-bg); color: var(--correct); border: 1px solid var(--correct); }
.rgrid.ng { background: var(--wrong-bg); color: var(--wrong); border: 1px solid var(--wrong); }

/* ホームの頻出テーマボタン */
.mode-btn.accent { background: #ef6c00; color: #fff; border-color: #ef6c00; }
.mode-btn.accent .sub { color: #ffe0b2; }

/* 頻出テーマ画面 */
.cat-head { font-size: 0.95rem; margin: 18px 0 8px; color: var(--primary-dark); }
.topic-item {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px; margin-bottom: 8px; text-decoration: none; color: var(--text);
}
.topic-item:active { background: #eef3f8; }
.topic-main { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.topic-label { font-weight: bold; font-size: 0.95rem; }
.topic-freq { font-size: 0.74rem; color: var(--muted); }
.topic-side { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }
.topic-score { font-size: 0.85rem; font-weight: bold; color: var(--primary); white-space: nowrap; }
.topic-score.all-ok { color: var(--correct); }
.topic-score.muted { color: var(--muted); font-weight: normal; }
.topic-arrow { color: var(--muted); font-size: 1.3rem; }