:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #1b2430;
  --ink-soft: #5b6b7c;
  --line: #d9e0e7;
  --accent: #1f6feb;
  --accent-dark: #164ea8;
  --ok: #17794f;
  --ok-bg: #e7f5ee;
  --warn: #9a5b00;
  --warn-bg: #fdf3e2;
  --info-bg: #e8f1fd;
  --danger: #b3261e;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.85;
  -webkit-text-size-adjust: 100%;
}

.app-header {
  background: var(--accent);
  color: #fff;
  padding: 18px 16px 14px;
}
.app-header h1 { margin: 0; font-size: 20px; }
.tagline { margin: 6px 0 0; font-size: 13px; opacity: .92; line-height: 1.6; }

.tabs {
  display: flex;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.tab {
  flex: 1;
  padding: 13px 2px;
  border: 0;
  background: none;
  font: inherit;
  font-size: 13.5px;
  color: var(--ink-soft);
  border-bottom: 3px solid transparent;
  cursor: pointer;
}
.tab.is-active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 700; }
/* タブの下に短い説明（10/21 中嶋さん: タブの名前を分かりやすく） */
.tab { display: flex; flex-direction: column; align-items: center; gap: 1px; padding: 8px 2px 9px; }
.tab-main { font-size: 14px; }
.tab-sub { font-size: 10.5px; font-weight: 400; color: var(--ink-soft); line-height: 1.5; white-space: nowrap; }
.tab-sub rt { font-size: 6.5px; }
.tab.is-active .tab-sub { color: var(--accent); }
/* 学習状況（わたし） */
.stat-row { display: flex; gap: 10px; margin: 4px 0 14px; }
.stat { flex: 1; background: #f4f7fd; border-radius: 10px; padding: 10px 8px; text-align: center; }
.stat-value { display: block; font-size: 20px; font-weight: 700; color: var(--accent); }
.stat-label { display: block; font-size: 12px; color: var(--ink-soft); }

main { padding: 16px; max-width: 720px; margin: 0 auto; }

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px 16px 22px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
}

.step-head { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.step-no {
  background: var(--accent); color: #fff; width: 30px; height: 30px;
  border-radius: 50%; display: grid; place-items: center;
  font-weight: 700; flex: none; font-size: 16px;
}
h2 { font-size: 18px; margin: 0; }
h3.block-title {
  font-size: 15px; margin: 22px 0 8px; padding-left: 10px;
  border-left: 4px solid var(--accent);
}

.help { color: var(--ink-soft); font-size: 14.5px; margin: 8px 0 14px; }
.help.small { font-size: 13.5px; margin: 2px 0 8px; }
.field-label { display: block; font-weight: 700; font-size: 15px; margin: 16px 0 6px; }
.scenario-desc { font-size: 13.5px; color: var(--ink-soft); margin: 8px 0 0; }

select, textarea, input[type="text"] {
  width: 100%; padding: 12px; font: inherit; font-size: 16px;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink);
}
textarea { resize: vertical; line-height: 1.8; }

button {
  font: inherit; cursor: pointer; border-radius: 8px; padding: 13px 18px;
  border: 1px solid transparent; font-size: 16px;
}
button.primary { background: var(--accent); color: #fff; width: 100%; margin-top: 18px; font-weight: 700; }
button.primary:hover { background: var(--accent-dark); }
button.primary:disabled { background: #9db6d8; cursor: default; }
button.secondary {
  background: #fff; color: var(--accent); border-color: var(--accent);
  width: 100%; margin-top: 10px;
}
button.tiny {
  padding: 6px 12px; font-size: 13.5px; background: #fff;
  border-color: var(--line); color: var(--ink-soft); width: auto; margin: 0;
}
button.tiny.saved { background: var(--ok-bg); color: var(--ok); border-color: var(--ok); }

.notice { padding: 12px 14px; border-radius: 8px; font-size: 14.5px; margin: 12px 0; }
.notice-info { background: var(--info-bg); }
.notice-ok { background: var(--ok-bg); color: var(--ok); font-weight: 700; }
.notice-warn { background: var(--warn-bg); color: var(--warn); }
.note { font-size: 13.5px; color: var(--ink-soft); background: #f7f9fb;
        padding: 10px 12px; border-radius: 8px; margin: 14px 0 0; }

.question {
  border: 1px solid var(--line); border-radius: 10px;
  padding: 14px; margin-bottom: 14px; background: #fcfdfe;
}
.question.kind-confusable { border-color: #e6b800; background: #fffdf3; }
.question.kind-vague { border-color: #9ab8e0; background: #f7fafe; }
.question-tag {
  display: inline-block; font-size: 12px; font-weight: 700;
  padding: 2px 9px; border-radius: 99px; margin-bottom: 8px;
}
.tag-fact { background: var(--info-bg); color: var(--accent-dark); }
.tag-confusable { background: #fdf0c9; color: #8a6100; }
.tag-vague { background: #eaf1fb; color: #2c5c9c; }
.question-text { font-weight: 700; margin: 0 0 4px; }
.question-hint { font-size: 13.5px; color: var(--ink-soft); margin: 0 0 10px; }
.unknown-row { margin-top: 8px; }

.record-block {
  background: #f7f9fb; border: 1px solid var(--line);
  border-radius: 8px; padding: 14px; white-space: pre-wrap; line-height: 1.95;
}
.record-block.interp { background: #fbf8f2; border-color: #e6d9c0; }
.record-block.original { background: #fff; color: var(--ink-soft); }

.unknown-list { margin: 0; padding-left: 20px; color: var(--warn); font-size: 14.5px; }

.change {
  border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 14px; margin-bottom: 12px; background: #fff;
}
.change-cat {
  display: inline-block; font-size: 12px; font-weight: 700; background: var(--info-bg);
  color: var(--accent-dark); padding: 2px 9px; border-radius: 99px; margin-bottom: 8px;
}
.change-line { font-size: 15px; margin: 4px 0; }
.change-before { color: var(--danger); text-decoration: line-through; }
.change-after { color: var(--ok); font-weight: 700; }
.change-reason { font-size: 14px; color: var(--ink-soft); margin: 8px 0 0;
                 border-top: 1px dashed var(--line); padding-top: 8px; }

.trouble {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 12px;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px;
}
.trouble-term { font-weight: 700; }
.trouble-desc { font-size: 13.5px; color: var(--ink-soft); margin: 4px 0 0; }

.score-box { margin-top: 22px; padding: 14px; background: #f7f9fb;
             border-radius: 10px; border: 1px solid var(--line); }
.score-total { font-size: 15px; font-weight: 700; }
.score-bars { margin-top: 10px; }
.score-row { display: flex; align-items: center; gap: 10px; font-size: 13.5px; margin: 6px 0; }
.score-row .label { width: 90px; flex: none; color: var(--ink-soft); }
.bar { flex: 1; height: 8px; background: #e3e9ef; border-radius: 99px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--accent); }
.score-note { font-size: 12.5px; color: var(--ink-soft); margin: 10px 0 0; }

.disclaimer {
  margin-top: 24px; padding: 14px; border-radius: 8px;
  background: var(--warn-bg); color: var(--warn); font-size: 14.5px; font-weight: 600;
}

.word { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.word-term { font-weight: 700; }
.word-meta { font-size: 13px; color: var(--ink-soft); margin-top: 4px; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: #1b2430; color: #fff; padding: 12px 20px; border-radius: 99px;
  font-size: 14.5px; z-index: 50; max-width: 90vw;
}

.hidden { display: none !important; }
.empty { color: var(--ink-soft); font-size: 14.5px; }


/* ---- 書いた記録 ---- */
.history-item {
  display: block; width: 100%; text-align: left;
  border: 1px solid var(--line); border-radius: 10px;
  padding: 13px 14px; margin-bottom: 10px; background: #fff;
}
.history-item:hover { border-color: var(--accent); }
.history-top {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 10px; margin-bottom: 4px;
}
.history-scenario { font-weight: 700; font-size: 15px; }
.history-date { font-size: 12.5px; color: var(--ink-soft); flex: none; }
.history-preview { font-size: 13.5px; color: var(--ink-soft); line-height: 1.6; }
.history-badge {
  display: inline-block; font-size: 12px; font-weight: 700;
  padding: 2px 9px; border-radius: 99px; margin-top: 8px;
}
.badge-done { background: var(--ok-bg); color: var(--ok); }
.badge-wip { background: var(--warn-bg); color: var(--warn); }

.answered-item {
  border-left: 3px solid var(--line); padding: 2px 0 2px 12px; margin-bottom: 10px;
}
.answered-q { font-size: 13.5px; color: var(--ink-soft); }
.answered-a { font-size: 15px; }
.answered-a.is-unknown { color: var(--warn); }

/* ---- ふりがな ---- */
ruby { ruby-position: over; ruby-align: center; }
rt { font-size: 0.55em; color: var(--ink-soft); font-weight: 400; letter-spacing: 0; }
body.no-furigana rt { display: none; }
.app-header rt, .step-no rt { color: inherit; opacity: .85; }

.header-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.furigana-toggle {
  flex: none; background: rgba(255,255,255,.15); color: #fff;
  border: 1px solid rgba(255,255,255,.6); padding: 6px 12px; font-size: 13px; border-radius: 99px;
}
.furigana-toggle[aria-pressed="false"] { background: transparent; opacity: .8; }

/* ---- 場面をえらぶ ---- */
.category-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 8px; }
.category-btn {
  background: #fff; border: 1px solid var(--line); color: var(--ink);
  padding: 12px 6px; font-weight: 700; font-size: 15px; width: 100%;
}
.category-btn.is-active { background: var(--accent); color: #fff; border-color: var(--accent); }
.category-btn.is-active rt { color: #fff; }
.type-block { margin-top: 16px; }
.type-head { font-weight: 700; font-size: 15px; margin: 0; }
.type-desc { font-size: 13px; color: var(--ink-soft); margin: 0 0 8px; }
.scenario-card {
  display: block; width: 100%; text-align: left; background: #fcfdfe;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 8px;
}
.scenario-card:hover { border-color: var(--accent); }
.scenario-card-title { font-weight: 700; font-size: 15px; margin: 0; }
.scenario-card-desc { font-size: 13px; color: var(--ink-soft); margin: 2px 0 0; line-height: 1.7; }
.badge-type {
  display: inline-block; font-size: 11.5px; font-weight: 700; padding: 1px 8px;
  border-radius: 99px; margin-right: 6px; vertical-align: middle;
}
.badge-normal { background: var(--ok-bg); color: var(--ok); }
.badge-incident { background: var(--warn-bg); color: var(--warn); }

/* ---- 記入例・定型 ---- */
.meta-line { font-size: 13px; color: var(--ink-soft); margin: 10px 0 0; }
.scenario-title { font-size: 17px; margin: 2px 0 4px; }
.field-table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 6px 0 4px; }
.field-table th, .field-table td {
  border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top;
}
.field-table th { width: 34%; background: #f7f9fb; font-weight: 700; font-size: 14px; }
.field-table td.status-imprecise { background: var(--warn-bg); }
.field-table td.status-unknown { background: #f4f4f4; color: var(--ink-soft); }
.field-note { display: block; font-size: 12.5px; color: var(--warn); margin-top: 4px; }
.mark { display: inline-block; width: 1.4em; font-weight: 700; }
.mark-ok { color: var(--ok); }
.mark-imprecise { color: var(--warn); }
.mark-unknown { color: var(--ink-soft); }

.fold { margin: 12px 0; border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; background: #fff; }
.fold summary { cursor: pointer; font-weight: 700; font-size: 14.5px; color: var(--accent); }
.fold[open] summary { margin-bottom: 8px; }

a.as-button {
  display: block; text-align: center; text-decoration: none; box-sizing: border-box;
  border-radius: 8px; padding: 13px 18px; font-size: 16px;
}
a.secondary.as-button { background: #fff; color: var(--accent); border: 1px solid var(--accent); margin-top: 10px; }

.tag-probe { background: #fdecef; color: #9c2a3f; }
.tag-contradiction { background: #efe7fb; color: #5b3a8f; }
.question.kind-probe { border-color: #e7a3b0; background: #fff8f9; }
.question.kind-contradiction { border-color: #c2a9e6; background: #faf7ff; }

.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li { padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.check-list .value { display: block; font-size: 13px; color: var(--ink-soft); }

.answered-question { font-size: 12.5px; color: var(--ink-soft); }
/* 色のついたボタン・通知の上では、ふりがなも同じ色にする（灰色だと背景に溶ける） */
button rt, a.as-button rt, .toast rt, .notice rt, .disclaimer rt,
.question-tag rt, .badge-type rt, .change-cat rt { color: inherit; opacity: .85; }

/* ---- 学ぶ（進捗・段階） ---- */
.header-tools { display: flex; gap: 8px; }
.progress-overall { background: #f7f9fb; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin: 10px 0 14px; }
.progress-overall .big { font-size: 26px; font-weight: 700; }
.progress-overall .bar { height: 12px; margin-top: 6px; }
.progress-line { display: flex; align-items: center; gap: 10px; font-size: 14px; margin: 8px 0 14px; }
.progress-line .bar { flex: 1; }
.stage-list { display: grid; gap: 10px; }
.stage-card { display: block; width: 100%; text-align: left; background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.stage-card:hover { border-color: var(--accent); }
.stage-card.is-next { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(31,111,235,.12); }
.stage-top { display: flex; justify-content: space-between; align-items: baseline; }
.stage-name { font-weight: 700; font-size: 16px; }
.stage-pct { font-weight: 700; color: var(--accent); }
.stage-desc { font-size: 13px; color: var(--ink-soft); margin: 2px 0 6px; }
.stage-card .bar { height: 8px; }
.badge-next { display: inline-block; font-size: 11.5px; font-weight: 700; background: var(--accent); color: #fff; padding: 1px 8px; border-radius: 99px; margin-left: 6px; }
.badge-next rt { color: #fff; }

.problem-group { margin-top: 14px; }
.problem-group h3 { font-size: 15px; margin: 0 0 6px; }
.problem-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: 13px; padding: 6px 10px; border: 1px solid var(--line); border-radius: 99px; background: #fff; color: var(--ink); }
.chip.is-done { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }
.chip .pic { margin-right: 3px; }

.scene-box { background: #fffbea; border: 1px solid #f1dc8a; border-radius: 10px; padding: 14px; line-height: 2; font-size: 16px; }
.scene-image { width: 100%; border-radius: 10px; border: 1px solid var(--line); margin-bottom: 10px; }
.lookup-row { display: flex; gap: 8px; margin-top: 8px; }
.lookup-row input { flex: 1; }
.lookup-row select { width: auto; }
.lookup-result { margin-top: 8px; padding: 10px 12px; border-radius: 8px; background: var(--info-bg); font-size: 14.5px; }
.lookup-result .jp { font-size: 18px; font-weight: 700; }
.focus-list { margin: 8px 0 0; padding-left: 20px; font-size: 14.5px; color: var(--ink-soft); }
.content-extra { background: #fdecef; color: #9c2a3f; border-radius: 8px; padding: 10px 12px; margin: 8px 0; font-size: 14.5px; }
.content-extra rt { color: inherit; }
.issue { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; }
.issue .issue-span { color: var(--danger); text-decoration: line-through; }
.issue .issue-sug { color: var(--ok); font-weight: 700; }
.issue .issue-msg { font-size: 14px; color: var(--ink-soft); margin-top: 4px; }
.issue.is-note { background: #f7f9fb; }

/* ---- 辞典 ---- */
.gl-item { border-bottom: 1px dashed var(--line); padding: 8px 0; font-size: 14.5px; }
.gl-abbr { display: inline-block; min-width: 56px; font-weight: 700; color: var(--accent); font-family: ui-monospace, monospace; }
.gl-term { font-weight: 700; }
.gl-meaning { font-size: 13.5px; color: var(--ink-soft); margin-top: 2px; }

/* ---- 学習者IDの入力 ---- */
.modal { position: fixed; inset: 0; background: rgba(27,36,48,.55); display: grid; place-items: center; z-index: 100; padding: 16px; }
.modal-box { background: #fff; border-radius: 14px; padding: 20px 18px; width: 100%; max-width: 420px; }
.modal-box h2 { font-size: 17px; }
.back-btn { margin-bottom: 8px; }

/* ---- 練習の履歴 ---- */
.drill-item { display: block; width: 100%; text-align: left; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; background: #fff; }
.drill-item .meta { font-size: 12.5px; color: var(--ink-soft); }
.drill-item .txt { font-size: 14.5px; margin-top: 2px; }

/* ---- 要素ごとの一覧・レベル導入 ---- */
.element-block { margin-top: 16px; padding-top: 10px; border-top: 2px solid var(--line); }
.element-head { font-size: 16px; margin: 0 0 2px; color: var(--accent); }
.group-head { font-size: 14px; margin: 10px 0 4px; color: var(--ink-soft); }
.level-goal { font-weight: 700; font-size: 15.5px; margin: 4px 0 8px; }
.conv .scene-box, .conv .record-block { margin-bottom: 6px; }

.brand-sub { font-size: 13px; font-weight: 400; opacity: .9; margin-left: 6px; }

/* ---- 同じ場面のレベル比較 ---- */
.ladder-level { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-top: 10px; }
.ladder-level.is-current { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(31,111,235,.12); }
.ladder-head { margin: 0 0 6px; font-size: 14px; color: var(--ink-soft); }
.ladder-head .pill { display: inline-block; font-size: 12px; font-weight: 700; padding: 1px 8px; border-radius: 99px; background: var(--info-bg); color: var(--accent-dark); margin-right: 6px; }
.native-text { font-size: 15px; margin: 6px 0 0; }
#btn-undo { width: 100%; margin-top: 12px; color: var(--ink-soft); }
.drill-item .tiny { margin-top: 6px; }

/* 母語の訳（導入章・レベルの導入文） */
.native { font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Myanmar", "Noto Sans Devanagari", sans-serif; }
.native-bar { margin: 0 0 12px; }
.native-note { font-size: 12.5px; color: var(--ink-soft); margin: 6px 0 0; line-height: 1.6; }
.native-title { font-size: 14px; color: var(--ink-soft); margin: -6px 0 10px; }
.native-para { font-size: 14.5px; color: #4a5a7a; background: #f4f7fd; border-left: 3px solid #c9d6f2; padding: 6px 10px; margin: -4px 0 12px; line-height: 1.7; border-radius: 0 8px 8px 0; }
.native-label { color: #4a5a7a; }
.native-inline { font-size: 13.5px; color: #4a5a7a; line-height: 1.6; margin-top: 2px; }
.conv-title { font-weight: 700; margin: 12px 0 4px; }
.native-select { margin-left: 6px; font-size: 14px; padding: 4px 8px; border-radius: 8px; border: 1px solid var(--line, #d6dbe6); }