/* ============================================================================
   Otter Lab School — site.css
   靜態內容層(/maps/*、/exams/* 文章頁)+ 首頁可爬區塊(地圖總覽、FAQ)。
   只用 base.css 的 tokens;動效遵守 MOTION.md(spring 入場、micro 互動)。
   ============================================================================ */

/* ── 通用:分類色點(app.css 的 .cdot 綁在 .cat-chip 底下,這裡開放給內容層)── */
.cdot {
  display: inline-block; width: 8px; height: 8px; border-radius: 999px; flex-shrink: 0;
  background: var(--c, var(--cyan));
  box-shadow: 0 0 8px color-mix(in srgb, var(--c, var(--cyan)) 70%, transparent);
}

/* ════════════════ 文章頁殼層 ════════════════ */
.crumbs { padding-top: calc(var(--nav-h) + 22px); }
.crumbs .wrap {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  font-family: var(--font-mono); font-size: 12px; color: var(--text-muted);
}
.crumbs a { color: var(--text-muted); transition: color var(--t-micro) var(--ease-smooth); }
.crumbs a:hover { color: var(--cyan-soft); }
.crumbs [aria-current] { color: var(--text-secondary); }
.crumb-sep { opacity: 0.55; }

.article-shell { padding: 16px 0 96px; }
.article-wrap { max-width: 880px; }

.article-head { padding: 18px 0 26px; border-bottom: 1px solid var(--border); margin-bottom: 30px; }
.article-kicker {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em;
  color: var(--text-muted); margin-bottom: 14px;
}
.article-head h1 {
  font-size: clamp(28px, 4.6vw, 40px); font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.22;
}
.article-sub { margin-top: 12px; color: var(--text-secondary); font-size: 15.5px; line-height: 1.85; max-width: 64ch; }
.article-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }

.article-kv { list-style: none; display: grid; gap: 10px; margin: 0 0 8px; font-size: 13.5px; }
.article-kv li {
  display: grid; grid-template-columns: 110px 1fr; gap: 12px;
  padding-bottom: 10px; border-bottom: 1px dashed rgba(255, 255, 255, 0.07);
}
.article-kv .k { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-muted); padding-top: 2px; }
.article-kv .v { color: var(--text-secondary); }

.article-sec { margin: 36px 0; }
.article-sec > h2 {
  position: relative; padding-left: 16px;
  font-size: 22px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 16px;
}
.article-sec > h2::before {
  content: ""; position: absolute; left: 0; top: 0.18em; bottom: 0.18em; width: 4px;
  border-radius: 4px; background: var(--grad-brand);
}
.article-sec > h3 { font-size: 16px; font-weight: 650; color: var(--text); margin: 22px 0 10px; }
.article-note { font-size: 13px; color: var(--text-muted); line-height: 1.85; margin: 6px 0 10px; }
.article-note a { color: var(--cyan-soft); border-bottom: 1px solid var(--border-cyan); }
.article-note a:hover { color: var(--cyan); }
.article-mile {
  display: inline-block; padding: 7px 13px; border-radius: var(--r-sm);
  background: var(--success-bg); color: var(--success-fg);
  border: 1px solid var(--success-border); font-size: 13px;
}
.article-facts p { color: var(--text-secondary); font-size: 14px; line-height: 1.8; }

/* 教學內文:.md 是側欄字級,文章頁放大並拉開行距 */
.article-md { font-size: 15px; line-height: 2; }
.article-md p { margin-bottom: 14px; }
.article-md h3 { font-size: 18px; margin: 26px 0 10px; }
.article-md h4 { font-size: 16px; margin: 20px 0 8px; }
.article-md ul, .article-md ol { margin: 0 0 14px; padding-inline-start: 22px; }
.article-md li { margin-bottom: 6px; }
.article-md blockquote { font-size: 14.5px; padding: 13px 17px; margin: 14px 0; }

/* ════════════════ 靜態考題卡 ════════════════ */
.sq {
  margin-top: 16px; padding: 18px 20px;
  border: 1px solid var(--border); border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.025);
  scroll-margin-top: calc(var(--nav-h) + 20px);
}
.sq:target { border-color: var(--border-cyan); box-shadow: 0 0 28px -12px var(--cyan); }
.sq-head {
  display: flex; align-items: baseline; justify-content: space-between;
  flex-wrap: wrap; gap: 6px 14px; margin-bottom: 4px;
}
.sq-no { font-family: var(--font-mono); font-size: 12px; color: var(--cyan-soft); font-weight: 500; }
.sq-src, .sq-node {
  font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); line-height: 1.6;
  transition: color var(--t-micro) var(--ease-smooth);
}
a.sq-src:hover, .sq-node:hover { color: var(--cyan-soft); }
.sq-node a { color: inherit; border-bottom: 1px dotted var(--border-strong); }
.sq-node a:hover { color: var(--cyan-soft); border-color: var(--border-cyan); }
.sq-q { white-space: pre-line; font-size: 15px; font-weight: 600; line-height: 1.85; margin: 10px 0 14px; color: var(--text); }
.sq-opts { list-style: none; display: grid; gap: 8px; padding: 0; margin: 0; }
.sq-opt {
  display: flex; align-items: flex-start; gap: 11px;
  padding: 11px 13px; border-radius: var(--r);
  background: rgba(255, 255, 255, 0.03); border: 1px solid var(--border);
  color: var(--text-secondary); font-size: 13.5px; line-height: 1.7;
  transition: border-color var(--t-quick) var(--ease-smooth), background var(--t-quick) var(--ease-smooth), color var(--t-quick) var(--ease-smooth);
}
.sq-key {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  width: 22px; height: 22px; border-radius: 999px; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-strong); color: var(--text-muted); margin-top: 1px;
}
/* 正解只在展開詳解後亮起 — 保住「先作答」的練習價值 */
.sq:has(.sq-detail[open]) .sq-opt.is-ans {
  border-color: var(--success-border); background: var(--success-bg); color: var(--success-fg);
}
.sq:has(.sq-detail[open]) .sq-opt.is-ans .sq-key {
  border-color: var(--success-border); color: var(--success-fg);
}
.sq-detail { margin-top: 12px; }
.sq-detail summary {
  list-style: none; cursor: pointer; user-select: none;
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--cyan-soft);
  padding: 6px 0;
  transition: color var(--t-micro) var(--ease-smooth);
}
.sq-detail summary::-webkit-details-marker { display: none; }
.sq-detail summary::before {
  content: "▸"; font-size: 11px;
  transition: transform var(--t-quick) var(--ease-spring);
}
.sq-detail[open] summary::before { transform: rotate(90deg); }
.sq-detail summary:hover { color: var(--cyan); }
.sq-detail summary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }
.sq-verdict { color: var(--success-fg); font-weight: 700; font-size: 14px; margin-top: 10px; }
.sq-expl { white-space: pre-line; font-size: 13.5px; line-height: 1.9; color: var(--text-secondary); margin-top: 8px; }
.sq-review { margin-top: 12px; font-size: 13px; color: var(--text-muted); }
.sq-review a { color: var(--cyan-soft); border-bottom: 1px solid var(--border-cyan); }
.sq-review a:hover { color: var(--cyan); }

/* ════════════════ Hub / 索引頁 ════════════════ */
.hub-stats { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 16px 0 2px; }
.hub-stat { font-family: var(--font-mono); font-size: 12.5px; color: var(--text-muted); }
.hub-stat strong { color: var(--cyan); font-size: 18px; font-weight: 700; margin-right: 5px; }

.hub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; margin-top: 10px; }
.hub-card {
  display: flex; flex-direction: column; gap: 8px;
  padding: 24px; border: 1px solid var(--border); border-radius: var(--r-lg);
  background: var(--bg-card);
  transition: transform var(--t-micro) var(--ease-spring), border-color var(--t-micro) var(--ease-smooth), background var(--t-micro) var(--ease-smooth);
}
.hub-card:hover { transform: translateY(-3px); border-color: var(--border-cyan); background: var(--bg-hover); }
.hub-card-title { font-size: 17.5px; font-weight: 700; letter-spacing: -0.01em; }
.hub-card-desc { font-size: 13.5px; color: var(--text-secondary); line-height: 1.7; }
.hub-card-meta { font-family: var(--font-mono); font-size: 11.5px; color: var(--text-muted); margin-top: auto; padding-top: 6px; }

.cat-head { display: flex; align-items: center; gap: 10px; }
.cat-head .cat-n { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); font-weight: 400; }
.article-sec > h2.cat-head { padding-left: 0; }
.article-sec > h2.cat-head::before { content: none; }

.node-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; margin-top: 14px; }
.node-card {
  display: flex; flex-direction: column; gap: 6px;
  padding: 15px 17px; border: 1px solid var(--border); border-radius: var(--r);
  background: var(--bg-card);
  transition: transform var(--t-micro) var(--ease-spring), border-color var(--t-micro) var(--ease-smooth), background var(--t-micro) var(--ease-smooth);
}
.node-card:hover { transform: translateY(-2px); border-color: var(--border-cyan); background: var(--bg-hover); }
.node-card-title {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  font-size: 14.5px; font-weight: 650; color: var(--text); line-height: 1.5;
}
.node-card-qz {
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 500; white-space: nowrap;
  color: #FFA5A5; background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.3);
  padding: 2px 9px; border-radius: var(--r-pill);
}
.node-card-desc { font-size: 12.5px; color: var(--text-muted); line-height: 1.65; }

/* ════════════════ 相關節點 / 前後導航 ════════════════ */
.rel-links { display: flex; flex-wrap: wrap; gap: 10px; }
.rel-chip {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 9px 15px; border: 1px solid var(--border); border-radius: var(--r-pill);
  background: var(--bg-card); font-size: 13.5px; color: var(--text-secondary);
  transition: transform var(--t-micro) var(--ease-spring), border-color var(--t-micro) var(--ease-smooth), color var(--t-micro) var(--ease-smooth);
}
.rel-chip:hover { transform: translateY(-1px); border-color: var(--border-cyan); color: var(--text); }

.article-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 44px; }
.pager-card {
  display: flex; flex-direction: column; gap: 5px;
  padding: 15px 17px; border: 1px solid var(--border); border-radius: var(--r);
  background: var(--bg-card);
  transition: border-color var(--t-micro) var(--ease-smooth), background var(--t-micro) var(--ease-smooth);
}
.pager-card:hover { border-color: var(--border-cyan); background: var(--bg-hover); }
.pager-card.is-next { text-align: right; align-items: flex-end; }
.pager-dir { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); }
.pager-label { font-size: 14px; font-weight: 600; color: var(--text); line-height: 1.5; }

/* ════════════════ 首頁:區塊標頭 ════════════════ */
.sec-head { max-width: 760px; }
.sec-kicker {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 14px;
}
.sec-kicker::before { content: ""; width: 22px; height: 2px; border-radius: 2px; background: var(--grad-brand); }
.sec-head h2 { font-size: clamp(26px, 3.4vw, 34px); font-weight: 800; letter-spacing: -0.02em; line-height: 1.25; }
.sec-sub { margin-top: 12px; color: var(--text-secondary); font-size: 15px; line-height: 1.85; }

/* ════════════════ 首頁:知識地圖總覽 ════════════════ */
.mapdex { padding: 76px 0 10px; }
.mapdex-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(272px, 1fr)); gap: 16px; margin-top: 30px; }
.mapdex-card {
  display: flex; flex-direction: column; gap: 8px;
  padding: 22px; border: 1px solid var(--border); border-radius: var(--r-lg);
  background: var(--bg-card);
  transition: transform var(--t-micro) var(--ease-spring), border-color var(--t-micro) var(--ease-smooth), background var(--t-micro) var(--ease-smooth);
}
.mapdex-card:hover { transform: translateY(-3px); border-color: var(--border-cyan); background: var(--bg-hover); }
.mapdex-card-title { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-size: 16.5px; font-weight: 700; }
.mapdex-card-n { font-family: var(--font-mono); font-size: 11px; font-weight: 400; color: var(--text-muted); white-space: nowrap; }
.mapdex-card-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.mapdex-card-more {
  margin-top: auto; padding-top: 8px;
  font-family: var(--font-mono); font-size: 11.5px; color: var(--cyan-soft);
}
.mapdex-exams {
  grid-column: 1 / -1;
  display: flex; align-items: center; justify-content: space-between; gap: 22px; flex-wrap: wrap;
  padding: 26px 28px; border: 1px solid var(--border-cyan); border-radius: var(--r-lg);
  background: linear-gradient(120deg, rgba(255, 107, 107, 0.06), rgba(0, 229, 255, 0.05));
}
.mapdex-exams-copy h3 { font-size: 19px; font-weight: 800; letter-spacing: -0.01em; }
.mapdex-exams-copy p { margin-top: 6px; font-size: 13.5px; color: var(--text-secondary); line-height: 1.7; }

/* ════════════════ 首頁:FAQ ════════════════ */
.faq { padding: 70px 0 30px; }
.faq-list { max-width: 860px; margin-top: 28px; display: grid; gap: 12px; }
.faq-item {
  border: 1px solid var(--border); border-radius: var(--r-lg);
  background: var(--bg-card);
  transition: border-color var(--t-quick) var(--ease-smooth);
}
.faq-item[open] { border-color: var(--border-strong); }
.faq-item summary {
  list-style: none; cursor: pointer; user-select: none;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 17px 20px; font-size: 15px; font-weight: 600; line-height: 1.6;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: var(--r-lg); }
.faq-caret {
  flex-shrink: 0; width: 22px; height: 22px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-strong); color: var(--text-muted);
  font-size: 13px; font-weight: 400; line-height: 1;
  transition: transform var(--t-quick) var(--ease-spring), color var(--t-quick) var(--ease-smooth), border-color var(--t-quick) var(--ease-smooth);
}
.faq-item[open] .faq-caret { transform: rotate(45deg); color: var(--cyan); border-color: var(--border-cyan); }
.faq-a { padding: 0 20px 18px; font-size: 14px; color: var(--text-secondary); line-height: 1.9; }
.faq-a p + p { margin-top: 8px; }
.faq-a a { color: var(--cyan-soft); border-bottom: 1px solid var(--border-cyan); }
.faq-a a:hover { color: var(--cyan); }

/* 首頁 hero 副標的內鏈:沿用文字色,虛線底標示可點 */
.maphero-sub a { color: inherit; border-bottom: 1px dashed var(--border-cyan); transition: color var(--t-micro) var(--ease-smooth); }
.maphero-sub a:hover { color: var(--cyan-soft); }

/* ════════════════ RWD / 動效收束 ════════════════ */
@media (max-width: 640px) {
  .article-shell { padding-bottom: 72px; }
  .article-pager { grid-template-columns: 1fr; }
  .pager-card.is-next { text-align: left; align-items: flex-start; }
  .mapdex { padding-top: 56px; }
  .mapdex-exams { flex-direction: column; align-items: flex-start; }
  .article-kv li { grid-template-columns: 92px 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .hub-card, .node-card, .rel-chip, .mapdex-card, .pager-card,
  .faq-caret, .sq-detail summary::before { transition: none; }
  .hub-card:hover, .node-card:hover, .rel-chip:hover, .mapdex-card:hover { transform: none; }
}