/* docs.css — 文件檢視頁的樣式 */

.doc-app {
  display: grid;
  grid-template-columns: 260px 1fr 220px;
  min-height: 100vh;
}

.doc-nav {
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  padding: 18px 14px;
  overflow-y: auto;
  max-height: 100vh;
  position: sticky;
  top: 0;
}

.doc-toc {
  padding: 18px 14px;
  border-left: 1px solid var(--border);
  overflow-y: auto;
  max-height: 100vh;
  position: sticky;
  top: 0;
}

.doc-main { min-width: 0; }

/* 68ch 是中文長文舒服的行長；再寬眼睛回行會找不到位置 */
.doc-body {
  max-width: 68ch;
  margin: 0 auto;
  padding: 44px 32px 120px;
  line-height: 1.85;
  font-size: 15px;
}

@media (max-width: 1100px) {
  .doc-app { grid-template-columns: 240px 1fr; }
  .doc-toc { display: none; }
}
@media (max-width: 760px) {
  .doc-app { grid-template-columns: 1fr; }
  .doc-nav { position: static; max-height: none; border-right: none; border-bottom: 1px solid var(--border); }
}

.doc-home {
  display: block;
  color: var(--primary);
  font-size: 13px;
  margin-bottom: 16px;
  text-decoration: none;
}
.doc-home:hover { text-decoration: underline; }

.doc-nav h4, .doc-toc h4 {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  margin: 20px 0 6px;
  font-weight: 600;
}
.doc-nav h4:first-of-type { margin-top: 0; }

.doc-nav a, .doc-toc a {
  display: block;
  padding: 3px 8px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 12.5px;
  border-radius: 5px;
  border-left: 2px solid transparent;
}
.doc-nav a:hover, .doc-toc a:hover { background: var(--bg-input); color: var(--text); }
.doc-nav a.active { color: var(--primary); border-left-color: var(--primary); background: none; }

.doc-toc a.lv3 { padding-left: 20px; font-size: 12px; }
.doc-toc a.lv4 { padding-left: 32px; font-size: 11.5px; }

/* ── Markdown 內容 ──────────────────────────── */

.doc-body h1 {
  font-size: 28px;
  margin: 0 0 22px;
  letter-spacing: -0.025em;
  font-weight: 600;
  line-height: 1.3;
  text-wrap: balance;
}
.doc-body h2 {
  font-size: 19px;
  margin: 46px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text);
  letter-spacing: -0.018em;
  font-weight: 600;
  text-wrap: balance;
}
.doc-body h3 { font-size: 16px; margin: 28px 0 8px; color: var(--text); font-weight: 600; letter-spacing: -0.01em; }
.doc-body h4 { font-size: 14px; margin: 20px 0 6px; color: var(--text); }

.doc-body p { margin: 0 0 14px; }
.doc-body a { color: var(--primary); }

.doc-body ul, .doc-body ol { margin: 0 0 14px; padding-left: 22px; }
.doc-body li { margin-bottom: 5px; }
.doc-body li.md-task { list-style: none; margin-left: -20px; }
.doc-body li.md-task input { margin-right: 6px; accent-color: var(--ok); }

.doc-body code {
  background: var(--bg-input);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--text);
}

.doc-body pre.md-code {
  position: relative;
  background: #0d1016;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 0 0 16px;
  line-height: 1.6;
}
.doc-body pre.md-code code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 12.5px;
}
.doc-body pre.md-code[data-lang]::after {
  content: attr(data-lang);
  position: absolute;
  top: 6px;
  right: 10px;
  font-size: 10px;
  color: var(--text-dim);
  font-family: var(--mono);
}

.doc-body blockquote {
  margin: 0 0 16px;
  padding: 10px 16px;
  border-left: 2px solid var(--border);
  background: none;
  color: var(--text-dim);
}

.doc-body hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }

.md-table-wrap { overflow-x: auto; margin: 0 0 16px; }
.doc-body table.md-table {
  border-collapse: collapse;
  font-size: 13px;
  width: 100%;
  min-width: 340px;
}
.doc-body table.md-table th {
  background: none;
  padding: 0 16px 8px 0;
  border: none;
  border-bottom: 1px solid var(--border);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  font-weight: 600;
  color: var(--text-faint);
  text-align: left;
  white-space: nowrap;
}
.doc-body table.md-table td {
  padding: 8px 16px 8px 0;
  border: none;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: baseline;
}
.doc-body table.md-table th:last-child,
.doc-body table.md-table td:last-child { padding-right: 0; }
.doc-body table.md-table tr:last-child td { border-bottom: none; }

.doc-body img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }

.doc-body strong { color: var(--text); font-weight: 600; }

/* 「打開互動範例」的連結做成按鈕，在教材裡一眼看得到 */
.doc-body a[href*="?"]:not([href^="http"]):not([href$=".md"]) {
  display: inline-block;
  padding: 2px 10px;
  margin: 1px 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  font-size: 12.5px;
  transition: border-color .12s, background .12s;
}
.doc-body a[href*="?"]:not([href^="http"]):not([href$=".md"]):hover {
  background: rgba(76, 154, 255, 0.1);
  border-color: rgba(76, 154, 255, 0.45);
}

.doc-error {
  padding: 14px 18px;
  border: 1px solid var(--error);
  background: rgba(239, 71, 111, 0.08);
  border-radius: var(--radius);
}

/* ── MathML ─────────────────────────────────
   瀏覽器原生渲染，這裡只調字級與間距。 */

.doc-body math {
  font-size: 1.06em;
  font-family: "Cambria Math", "STIX Two Math", "Latin Modern Math", serif;
}

/* ⚠️ 絕對不要在 <math> 上設 display / overflow——
   那會蓋掉瀏覽器的 `display: block math`，排版引擎失效，
   式子會變成一個字一行往下疊。捲動與置中做在外層的 .math-block。 */
.doc-body .math-block {
  margin: 16px 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 6px 0;
}

/* \boxed */
.doc-body .mml-boxed {
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
}

/* 解析失敗時退回顯示原始 LaTeX，而不是靜靜地錯 */
.doc-body .mml-failed,
.doc-body .mml-unknown {
  color: var(--error);
  font-family: var(--mono);
  font-size: 0.9em;
}

/* 表格裡的公式不要撐太開 */
.doc-body table.md-table math { font-size: 1em; }