/* Databricks GenAI Engineer Associate 教科書 */
:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #1c2733;
  --muted: #5b6b7b;
  --accent: #e05d44;        /* Databricks風オレンジレッド */
  --accent-soft: #fdeeea;
  --link: #1662dd;
  --border: #e3e8ee;
  --code-bg: #f1f4f8;
  --ok: #1e8e5a;
  --ok-soft: #e6f5ee;
  --warn-soft: #fff7e0;
  --warn-border: #e8c34a;
  --info-soft: #eaf2fd;
  --info-border: #7fa8e8;
  --shadow: 0 1px 3px rgba(20, 30, 40, .07);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181d;
    --card: #1d232b;
    --text: #e6ebf0;
    --muted: #9aa8b5;
    --accent: #ff7a5c;
    --accent-soft: #3a2621;
    --link: #7ab0ff;
    --border: #2c3542;
    --code-bg: #252d38;
    --ok: #4cc98a;
    --ok-soft: #1d3229;
    --warn-soft: #33301d;
    --warn-border: #a08b30;
    --info-soft: #1e2a3c;
    --info-border: #4a6ea8;
    --shadow: 0 1px 3px rgba(0, 0, 0, .4);
  }
}
:root[data-theme="dark"] {
  --bg: #14181d;
  --card: #1d232b;
  --text: #e6ebf0;
  --muted: #9aa8b5;
  --accent: #ff7a5c;
  --accent-soft: #3a2621;
  --link: #7ab0ff;
  --border: #2c3542;
  --code-bg: #252d38;
  --ok: #4cc98a;
  --ok-soft: #1d3229;
  --warn-soft: #33301d;
  --warn-border: #a08b30;
  --info-soft: #1e2a3c;
  --info-border: #4a6ea8;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
html[data-fontsize="large"] { font-size: 18px; }
html[data-fontsize="xlarge"] { font-size: 20px; }
body {
  margin: 0;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  font-size: 1rem;
}

.container { max-width: 860px; margin: 0 auto; padding: 0 20px 80px; }

/* ヘッダー */
.site-header {
  background: linear-gradient(135deg, #b3301c, #e05d44 60%, #f0803c);
  color: #fff;
  padding: 26px 20px;
}
.site-header .inner { max-width: 860px; margin: 0 auto; }
.site-header a { color: #fff; text-decoration: none; }
.site-title { font-size: 1.05rem; font-weight: 700; letter-spacing: .02em; margin: 0; opacity: .95; }
.site-sub { margin: 4px 0 0; font-size: .82rem; opacity: .85; }

/* 設定バー(文字サイズ・テーマ) */
.settings-bar {
  display: flex; gap: 16px; flex-wrap: wrap;
  margin-top: 12px;
}
.settings-group {
  display: flex; align-items: center; gap: 6px;
  font-size: .75rem; opacity: .95;
}
.settings-group .settings-label { margin-right: 2px; }
.settings-bar button {
  font-family: inherit;
  font-size: .75rem;
  color: #fff;
  background: rgba(255, 255, 255, .16);
  border: 1px solid rgba(255, 255, 255, .55);
  border-radius: 999px;
  padding: 2px 12px;
  cursor: pointer;
  line-height: 1.6;
}
.settings-bar button:hover { background: rgba(255, 255, 255, .3); }
.settings-bar button.active {
  background: #fff;
  color: #b3301c;
  border-color: #fff;
  font-weight: 700;
}

/* パンくず */
.breadcrumb { font-size: .85rem; color: var(--muted); margin: 18px 0 0; }
.breadcrumb a { color: var(--link); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* 見出し */
h1 { font-size: 1.7rem; line-height: 1.4; margin: 18px 0 6px; }
h2 {
  font-size: 1.25rem;
  margin: 48px 0 14px;
  padding: .35em .7em;
  border-left: 5px solid var(--accent);
  background: var(--card);
  border-radius: 4px;
  box-shadow: var(--shadow);
}
h3 { font-size: 1.05rem; margin: 30px 0 8px; border-bottom: 2px solid var(--border); padding-bottom: .25em; }
.lesson-meta { color: var(--muted); font-size: .88rem; margin-bottom: 8px; }

p { margin: .8em 0; }
a { color: var(--link); }
strong { color: var(--accent); }
ul, ol { padding-left: 1.5em; }
li { margin: .3em 0; }

/* カード */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 22px;
  margin: 16px 0;
  box-shadow: var(--shadow);
}

/* ボックス各種 */
.box { border-radius: 8px; padding: 14px 18px; margin: 18px 0; }
.box .box-title { font-weight: 700; margin: 0 0 6px; font-size: .92rem; }
.box-goal { background: var(--accent-soft); border: 1px solid var(--accent); }
.box-point { background: var(--warn-soft); border: 1px solid var(--warn-border); }
.box-example { background: var(--info-soft); border: 1px solid var(--info-border); }
.box-summary { background: var(--ok-soft); border: 1px solid var(--ok); }

/* 表 */
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; background: var(--card); }
th, td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; vertical-align: top; }
th { background: var(--code-bg); white-space: nowrap; }

/* コード */
code {
  background: var(--code-bg);
  border-radius: 4px;
  padding: .12em .4em;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: .85em;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.6;
}
pre code { background: none; padding: 0; }

/* 目次(index) */
.chapter { margin: 26px 0; }
.chapter-head {
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
  margin-bottom: 8px;
}
.chapter-head h2 { flex: 1; margin: 0; }
.weight-badge {
  font-size: .78rem; font-weight: 700; color: #fff;
  background: var(--accent); border-radius: 999px; padding: 2px 12px;
  white-space: nowrap;
}
.lesson-list { list-style: none; padding: 0; margin: 0; }
.lesson-list li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 8px 0;
  box-shadow: var(--shadow);
}
.lesson-list a, .lesson-list .pending {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; text-decoration: none; color: var(--text);
}
.lesson-list a:hover { background: var(--accent-soft); border-radius: 8px; }
.lesson-list .pending { color: var(--muted); }
.status { font-size: 1rem; width: 1.4em; text-align: center; flex-shrink: 0; }
.lesson-no { font-weight: 700; color: var(--accent); white-space: nowrap; flex-shrink: 0; }
.pending .lesson-no { color: var(--muted); }

/* クイズ */
.quiz {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 5px solid var(--link);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 20px 0;
}
.quiz-q { font-weight: 700; margin: 0 0 10px; }
.quiz ol { margin: 8px 0; }
.quiz details {
  margin-top: 10px;
  background: var(--code-bg);
  border-radius: 6px;
  padding: 10px 14px;
}
.quiz summary { cursor: pointer; font-weight: 700; color: var(--link); }
.quiz .answer-label { color: var(--ok); font-weight: 700; }

/* ナビゲーション(前後) */
.lesson-nav {
  display: flex; justify-content: space-between; gap: 12px;
  margin-top: 56px; flex-wrap: wrap;
}
.lesson-nav a, .lesson-nav span {
  flex: 1; min-width: 200px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
}
.lesson-nav .nav-label { display: block; font-size: .78rem; color: var(--muted); }
.lesson-nav .next { text-align: right; }
.lesson-nav span.disabled { color: var(--muted); background: none; box-shadow: none; }

footer { margin-top: 60px; text-align: center; color: var(--muted); font-size: .8rem; }

/* 試験対策 vs 現行Databricks 比較ボックス */
.box-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 18px 0;
}
.box-compare > div { padding: 12px 16px; }
.box-compare .exam-side { background: var(--warn-soft); }
.box-compare .now-side { background: var(--info-soft); }
.box-compare h4 { margin: 0 0 6px; font-size: .88rem; }
.box-compare ul { margin: 4px 0; padding-left: 1.3em; }
.box-compare p { margin: 4px 0; font-size: .92rem; }

/* アーキテクチャ図(フロー) */
.flow {
  display: flex; flex-direction: column; align-items: center;
  margin: 22px 0; padding: 18px 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}
.flow .fnode {
  background: var(--bg);
  border: 2px solid var(--accent);
  border-radius: 8px;
  padding: 7px 20px;
  font-weight: 600;
  text-align: center;
  min-width: 220px;
  max-width: 100%;
  font-size: .92rem;
}
.flow .fnode small { display: block; font-weight: 400; color: var(--muted); font-size: .78rem; }
.flow .fnode.alt { border-color: var(--info-border); }
.flow .farrow { color: var(--accent); font-size: 1.15rem; line-height: 1.7; }
.flow .farrow small { color: var(--muted); font-size: .75rem; margin-left: 6px; }
.flow .fbranch {
  display: flex; gap: 8px; flex-wrap: wrap; justify-content: center;
  margin: 2px 0;
}
.flow .fbranch .fnode { min-width: 0; padding: 5px 12px; font-size: .82rem; }
.flow .fcaption { color: var(--muted); font-size: .78rem; margin-top: 10px; text-align: center; }

/* 模擬試験 */
.exam-bar {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0 0 10px 10px;
  padding: 10px 16px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.exam-bar .exam-timer { font-weight: 700; font-variant-numeric: tabular-nums; }
.exam-bar .exam-timer.warn { color: var(--accent); }
.exam-q {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 5px solid var(--link);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 18px 0;
}
.exam-q.correct { border-left-color: var(--ok); }
.exam-q.incorrect { border-left-color: var(--accent); }
.exam-q-text { font-weight: 700; margin: 0 0 10px; }
.exam-opts { display: flex; flex-direction: column; gap: 6px; }
.exam-opts label {
  display: flex; gap: 8px; align-items: baseline;
  padding: 6px 10px; border-radius: 6px; cursor: pointer;
}
.exam-opts label:hover { background: var(--code-bg); }
.exam-exp {
  display: none;
  margin-top: 12px;
  background: var(--code-bg);
  border-radius: 6px;
  padding: 10px 14px;
  font-size: .92rem;
}
.exam-q.graded .exam-exp { display: block; }
.exam-result-mark { font-weight: 700; margin-top: 10px; display: none; }
.exam-q.graded .exam-result-mark { display: block; }
.exam-q.correct .exam-result-mark { color: var(--ok); }
.exam-q.incorrect .exam-result-mark { color: var(--accent); }
.exam-submit {
  display: block; width: 100%;
  background: var(--accent); color: #fff;
  border: none; border-radius: 8px;
  padding: 14px; font-size: 1.05rem; font-weight: 700;
  cursor: pointer; margin: 30px 0 10px;
  font-family: inherit;
}
.exam-score {
  display: none;
  text-align: center;
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: 10px;
  padding: 18px;
  margin: 16px 0;
}
.exam-score .score-num { font-size: 1.8rem; font-weight: 700; }

/* モバイル */
@media (max-width: 640px) {
  .container { padding: 0 14px 60px; }
  .site-header { padding: 18px 14px; }
  h1 { font-size: 1.32rem; }
  h2 { font-size: 1.08rem; padding: .35em .55em; }
  th, td { padding: 7px 8px; font-size: .84rem; }
  pre { padding: 10px 12px; font-size: .8rem; }
  .card, .quiz, .exam-q { padding: 14px 14px; }
  .box { padding: 12px 14px; }
  .lesson-nav a, .lesson-nav span { min-width: 100%; }
  .lesson-nav .next { text-align: left; }
  .box-compare { grid-template-columns: 1fr; }
  .flow .fnode { min-width: 0; width: 100%; }
}