/* Options Academy — スタイル */
:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --ink: #1d2433;
  --muted: #5c6478;
  --line: #e3e7f0;
  --accent: #2458e6;
  --accent-soft: #e8eefc;
  --green: #0f9d58;
  --red: #d93025;
  --amber: #b26a00;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(20, 30, 60, .07);
  font-size: 16px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.85;
}

/* ---------- ヘッダー ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 16px;
  padding: 10px 20px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.menu-btn {
  display: none;
  border: 1px solid var(--line); background: var(--panel);
  border-radius: 8px; font-size: 18px; padding: 4px 10px; cursor: pointer;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-logo { font-size: 28px; }
.brand h1 { font-size: 18px; margin: 0; letter-spacing: .02em; }
.brand-sub { font-size: 11.5px; color: var(--muted); margin: 0; }
.progress-wrap { margin-left: auto; width: 220px; }
.progress-label { text-align: right; font-size: 11.5px; color: var(--muted); }
.progress-bar { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; }
#progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), #6c8dff); border-radius: 99px; transition: width .4s; }

/* ---------- レイアウト ---------- */
.layout { display: flex; min-height: calc(100vh - 61px); }
.sidebar {
  width: 280px; flex-shrink: 0;
  padding: 18px 14px 30px;
  border-right: 1px solid var(--line);
  background: var(--panel);
  overflow-y: auto;
}
.nav-section { margin-bottom: 18px; }
.nav-heading {
  font-size: 11px; font-weight: 700; color: var(--muted);
  text-transform: uppercase; letter-spacing: .08em; margin: 0 8px 6px;
}
.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px; border-radius: 8px;
  color: var(--ink); text-decoration: none; font-size: 13.5px;
  border: 1px solid transparent;
}
.nav-item:hover { background: var(--accent-soft); }
.nav-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 700; border-color: #d3dffc; }
.nav-item .check { margin-left: auto; font-size: 12px; color: var(--green); }
.nav-footer { font-size: 11px; color: var(--muted); margin: 24px 8px 0; }

.main { flex: 1; min-width: 0; padding: 28px 34px 80px; max-width: 940px; }

/* ---------- 教科書本文 ---------- */
.md h1 { font-size: 26px; border-bottom: 3px solid var(--accent); padding-bottom: 10px; margin: 10px 0 20px; }
.md h2 { font-size: 20px; margin: 34px 0 12px; padding-left: 12px; border-left: 5px solid var(--accent); }
.md h3 { font-size: 16.5px; margin: 26px 0 10px; color: #26304a; }
.md p { margin: 10px 0; }
.md blockquote {
  margin: 16px 0; padding: 12px 18px;
  background: var(--accent-soft); border-left: 4px solid var(--accent);
  border-radius: 0 10px 10px 0; color: #20304f;
}
.md blockquote p { margin: 4px 0; }
.md table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 13.5px; background: var(--panel); }
.md th, .md td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.md th { background: #eef2fb; font-weight: 700; }
.md tr:nth-child(even) td { background: #fafbfe; }
.md ul, .md ol { padding-left: 24px; margin: 10px 0; }
.md li { margin: 4px 0; }
.md strong { color: #14213d; }
.md hr { border: none; border-top: 1px solid var(--line); margin: 24px 0; }
.md input[type=checkbox] { margin-right: 6px; }

.chapter-meta { display: flex; gap: 8px; margin-bottom: 6px; flex-wrap: wrap; }
.badge { font-size: 11.5px; font-weight: 700; padding: 3px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); }
.badge.gray { background: #eef0f5; color: var(--muted); }

/* ---------- ホーム ---------- */
.hero {
  background: linear-gradient(135deg, #1b2a55, #2458e6 70%, #4c7dff);
  color: #fff; border-radius: 18px; padding: 34px 34px 30px; margin-bottom: 26px;
  box-shadow: var(--shadow);
}
.hero h2 { font-size: 26px; margin: 0 0 10px; }
.hero p { margin: 6px 0; opacity: .92; font-size: 14px; }
.hero .cta-row { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 20px; border-radius: 10px;
  border: none; cursor: pointer; font-size: 14px; font-weight: 700;
  text-decoration: none; transition: transform .1s, box-shadow .1s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: #fff; color: var(--accent); }
.btn-ghost { background: rgba(255,255,255,.16); color: #fff; border: 1px solid rgba(255,255,255,.45); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-outline { background: var(--panel); color: var(--accent); border: 1.5px solid var(--accent); }

.chapter-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: var(--shadow); text-decoration: none; color: var(--ink);
  display: block; transition: transform .12s, box-shadow .12s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(20,30,60,.12); }
.card h3 { margin: 4px 0 6px; font-size: 15px; }
.card p { margin: 0; font-size: 12.5px; color: var(--muted); }
.card .card-top { display: flex; justify-content: space-between; align-items: center; font-size: 11.5px; color: var(--muted); }
.card .done { color: var(--green); font-weight: 700; }

/* ---------- クイズ ---------- */
.quiz-box {
  margin-top: 40px; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow);
}
.quiz-box > h2 { margin-top: 0; }
.quiz-item { margin: 18px 0; }
.quiz-q { font-weight: 700; margin-bottom: 8px; }
.quiz-choices { display: grid; gap: 6px; }
.quiz-choice {
  text-align: left; padding: 9px 14px; font-size: 13.5px;
  border: 1.5px solid var(--line); border-radius: 8px;
  background: #fff; cursor: pointer; font-family: inherit; color: var(--ink);
  transition: border-color .1s, background .1s;
}
.quiz-choice:hover { border-color: var(--accent); }
.quiz-choice.correct { border-color: var(--green); background: #e9f7ef; }
.quiz-choice.wrong { border-color: var(--red); background: #fdeceb; }
.quiz-choice:disabled { cursor: default; }
.quiz-exp { margin-top: 8px; font-size: 13px; color: var(--muted); background: #f7f8fc; border-radius: 8px; padding: 8px 12px; display: none; }
.quiz-exp.show { display: block; }
.quiz-result { margin-top: 16px; font-weight: 700; font-size: 15px; }
.quiz-result.good { color: var(--green); }
.quiz-result.retry { color: var(--amber); }
.chapter-footer { display: flex; justify-content: space-between; margin-top: 34px; gap: 10px; flex-wrap: wrap; }

/* ---------- ツール ---------- */
.tool-panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow); }
.tool-grid { display: grid; grid-template-columns: 330px 1fr; gap: 20px; align-items: start; }
@media (max-width: 860px) { .tool-grid { grid-template-columns: 1fr; } }
.legs { display: grid; gap: 10px; margin-top: 10px; }
.leg {
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px; font-size: 12.5px;
}
.leg .leg-head { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; }
.leg label { display: flex; flex-direction: column; gap: 2px; font-size: 11px; color: var(--muted); }
.leg input, .leg select, .field input, .field select {
  padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; font-size: 13px; font-family: inherit;
}
.field { display: flex; flex-direction: column; gap: 3px; font-size: 12px; color: var(--muted); margin-bottom: 10px; }
.leg-summary { margin-top: 12px; font-size: 13px; }
.leg-summary table { font-size: 12.5px; }
.payoff-canvas-wrap { position: relative; }
canvas { width: 100%; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin-top: 14px; }
.stat { background: #f7f8fc; border-radius: 10px; padding: 10px 12px; }
.stat .k { font-size: 11px; color: var(--muted); }
.stat .v { font-size: 16px; font-weight: 700; }
.stat .v.pos { color: var(--green); }
.stat .v.neg { color: var(--red); }
.preset-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.preset-btn { font-size: 12px; padding: 6px 12px; border-radius: 99px; border: 1px solid var(--line); background: #fff; cursor: pointer; font-family: inherit; }
.preset-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 用語集 ---------- */
.glossary-search {
  width: 100%; max-width: 480px; padding: 10px 16px; font-size: 14px;
  border: 1.5px solid var(--line); border-radius: 99px; margin: 10px 0 18px; font-family: inherit;
}
.glossary-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 10px; }
.term { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; }
.term h3 { margin: 0 0 4px; font-size: 14px; color: var(--accent); }
.term p { margin: 0; font-size: 12.5px; color: #333c52; }

/* ---------- 用語ポップアップ & 本文用語リンク ---------- */
.glossterm {
  background: none; border: none; padding: 0; margin: 0;
  font: inherit; color: var(--accent); cursor: help;
  border-bottom: 1.5px dotted var(--accent);
}
#glossary-popup {
  position: absolute; z-index: 200; display: none;
  width: 300px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; box-shadow: 0 8px 30px rgba(20,30,60,.18);
  padding: 12px 14px; font-size: 12.5px;
}
#glossary-popup h3 { margin: 0 0 4px; font-size: 13.5px; color: var(--accent); }
#glossary-popup p { margin: 0 0 6px; }

/* ---------- 要点まとめ ---------- */
.keypoints {
  margin: 30px 0 0; padding: 16px 20px;
  background: linear-gradient(135deg, #f2f6ff, #eaf1ff);
  border: 1px solid #d3dffc; border-radius: var(--radius);
}
.keypoints h3 { margin: 0 0 8px; font-size: 15px; color: var(--accent); }
.keypoints ol { margin: 0; padding-left: 22px; }
.keypoints li { margin: 5px 0; font-size: 13.5px; }

/* ---------- 計算ドリル ---------- */
.drill-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.drill-input { width: 140px; padding: 7px 10px; border: 1.5px solid var(--line); border-radius: 8px; font-size: 14px; font-family: inherit; }
.drill-unit { font-size: 13px; color: var(--muted); }
.drill-item { margin: 18px 0; padding-bottom: 8px; border-bottom: 1px dashed var(--line); }
.drill-item:last-of-type { border-bottom: none; }
.drill-ok .drill-input { border-color: var(--green); }
.drill-ng .drill-input { border-color: var(--red); }

/* ---------- 検索結果 ---------- */
.search-result {
  display: block; background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 14px; margin: 8px 0;
  text-decoration: none; color: var(--ink); font-size: 13px;
}
.search-result:hover { border-color: var(--accent); }
.search-result p { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.search-result mark { background: #ffe9a8; padding: 0 2px; }
.md pre {
  background: #1d2433; color: #dce3f2; border-radius: 10px;
  padding: 12px 16px; overflow-x: auto; font-size: 12.5px; line-height: 1.6;
}
.md pre code { font-family: Consolas, "Courier New", monospace; }
.md code { background: #eef1f8; border-radius: 4px; padding: 1px 5px; font-size: .92em; }

/* ---------- ダークテーマ ---------- */
html[data-theme="dark"] {
  --bg: #12151c;
  --panel: #1a1f2b;
  --ink: #e2e7f2;
  --muted: #97a0b5;
  --line: #2a3142;
  --accent: #6c8dff;
  --accent-soft: #232c44;
  --green: #3ddc84;
  --red: #ff6b61;
  --amber: #ffc043;
  --shadow: 0 2px 10px rgba(0,0,0,.4);
}
html[data-theme="dark"] .md th { background: #232c44; }
html[data-theme="dark"] .md tr:nth-child(even) td { background: #1e2433; }
html[data-theme="dark"] .md code { background: #232c44; }
html[data-theme="dark"] .quiz-choice { background: var(--panel); color: var(--ink); }
html[data-theme="dark"] .quiz-choice.correct { background: rgba(61,220,132,.12); }
html[data-theme="dark"] .quiz-choice.wrong { background: rgba(255,107,97,.12); }
html[data-theme="dark"] .quiz-exp { background: #1e2433; }
html[data-theme="dark"] .stat { background: #1e2433; }
html[data-theme="dark"] .keypoints { background: linear-gradient(135deg, #1e2433, #232c44); border-color: #2f3a5c; }
html[data-theme="dark"] .md pre { background: #0d1017; }
html[data-theme="dark"] .topbar { background: rgba(18,21,28,.92); }
html[data-theme="dark"] .search-result mark { background: #7a5d00; color: #fff; }

/* ---------- ヘッダー設定ボタン ---------- */
.pref-btns { display: flex; gap: 6px; }
.pref-btn {
  border: 1px solid var(--line); background: var(--panel);
  border-radius: 8px; width: 34px; height: 34px; font-size: 15px; cursor: pointer;
  color: var(--ink);
}
.pref-btn:hover { border-color: var(--accent); }

/* ---------- 模試オプション・タイマー ---------- */
.exam-opts { display: flex; gap: 14px; align-items: flex-end; flex-wrap: wrap; }
.exam-opts .field { flex: 1; min-width: 120px; margin-bottom: 0; }
.exam-timer {
  text-align: right; font-weight: 700; font-size: 15px;
  padding: 6px 10px; border-radius: 8px; background: var(--accent-soft); color: var(--accent);
  margin-bottom: 12px;
}
.exam-timer.urgent { background: #fdeceb; color: var(--red); animation: pulse 1s infinite; }
html[data-theme="dark"] .exam-timer.urgent { background: rgba(255,107,97,.15); }
@keyframes pulse { 50% { opacity: .55; } }
.srs-note { font-size: 12.5px; color: var(--accent); font-weight: 700; margin: 6px 0 0; }

/* ---------- ダッシュボード ---------- */
.mini-bar {
  display: inline-block; vertical-align: middle;
  width: 90px; height: 10px; background: var(--line); border-radius: 99px; overflow: hidden;
}
.mini-bar > div { height: 100%; border-radius: 99px; }
.mini-bar-num { font-size: 12px; margin-left: 6px; }
.srs-hist { display: flex; align-items: flex-end; gap: 10px; height: 110px; }
.srs-day { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; flex: 1; }
.srs-bar { width: 70%; background: linear-gradient(180deg, var(--accent), #4c7dff); border-radius: 6px 6px 0 0; min-height: 4px; }
.srs-n { font-size: 12px; font-weight: 700; color: var(--ink); }
.srs-label { font-size: 11px; color: var(--muted); }

/* ---------- 経過日数スライダー ---------- */
input[type="range"] { accent-color: var(--accent); padding: 0; }

/* ---------- 印刷 ---------- */
@media print {
  :root { font-size: 12px; }
  .topbar, .sidebar, .chapter-footer, .no-print, .tool-panel .preset-row, .sidebar-overlay { display: none !important; }
  .main { max-width: none; padding: 0; }
  body { background: #fff; }
  html[data-theme="dark"] body, html[data-theme="dark"] .md, html[data-theme="dark"] .keypoints { background: #fff; color: #111; }
  .md h1 { page-break-before: auto; }
  .md table, .md blockquote, .keypoints { page-break-inside: avoid; }
  .md h2 { page-break-after: avoid; }
  a { color: inherit; text-decoration: none; }
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 920px) {
  .menu-btn { display: block; }
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
    transform: translateX(-105%); transition: transform .25s; width: 290px;
    box-shadow: 4px 0 24px rgba(0,0,0,.18);
  }
  .sidebar.open { transform: translateX(0); }
  .main { padding: 20px 18px 70px; }
  .brand-sub { display: none; }
  .progress-wrap { width: 120px; }
  .hero { padding: 24px 20px; }
}
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.35); z-index: 90; }
.sidebar-overlay.show { display: block; }

@media print {
  .topbar, .sidebar, .chapter-footer, .quiz-box, .tool-panel { display: none !important; }
  .main { max-width: none; }
}