:root {
  --bg: #faf8f4;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5d6670;
  --line: #e4e0d8;
  --accent: #1f5f5b;
  --accent-soft: #e3efed;
  --code-bg: #f2efe9;
  --mark: #fff3c4;
  --font: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Segoe UI", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --measure: 46rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181b;
    --surface: #1c2024;
    --text: #e6e3dd;
    --muted: #9aa3ac;
    --line: #2d3338;
    --accent: #7cc2ba;
    --accent-soft: #1f3331;
    --code-bg: #22272c;
    --mark: #4a4020;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: 0.01em;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img, video, svg { max-width: 100%; height: auto; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 16px; }

/* 頁首頁尾 */
.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 3.5rem; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; font-size: 1.05rem; }
.brand .aka { margin-left: 0.5rem; font-weight: 400; font-size: 0.8rem; color: var(--muted); font-style: italic; }
.site-nav { display: flex; gap: 1.1rem; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--accent); }
.site-footer { border-top: 1px solid var(--line); margin-top: 4rem; color: var(--muted); font-size: 0.875rem; }
.site-footer p { margin: 1.5rem 0; }

main { padding-top: 2rem; }
h1, h2, h3, h4 { line-height: 1.35; letter-spacing: 0; }
h1 { font-size: 1.85rem; margin: 0.5rem 0 0.75rem; }
h2 { font-size: 1.3rem; margin: 2.5rem 0 0.75rem; }

/* 首頁 */
.hero { padding: 1.5rem 0 0.5rem; }
.hero h1 { font-size: 2.1rem; margin: 0; }
.hero p { color: var(--muted); margin: 0.5rem 0 0; }
.hero .aka { margin-top: 0.15rem; font-style: italic; letter-spacing: 0.02em; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.section-head a { font-size: 0.9rem; text-decoration: none; }
.empty { color: var(--muted); padding: 2rem 0; }

/* 文章清單 */
.doc-list { list-style: none; padding: 0; margin: 0; }
.doc-item { padding: 1rem 0; border-bottom: 1px solid var(--line); }
.doc-item:last-child { border-bottom: none; }
.doc-title { font-weight: 600; font-size: 1.05rem; text-decoration: none; color: var(--text); }
.doc-title:hover { color: var(--accent); }
.doc-meta { color: var(--muted); font-size: 0.85rem; }
.doc-meta a { color: var(--muted); }
.doc-summary { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.95rem; line-height: 1.7; }

/* 專題卡片 */
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: 0.9rem; }
.topic-card {
  display: flex; flex-direction: column; gap: 0.35rem;
  padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: 10px;
  background: var(--surface); color: var(--text); text-decoration: none;
}
.topic-card:hover { border-color: var(--accent); }
.topic-title { font-weight: 600; }
.topic-desc { color: var(--muted); font-size: 0.92rem; line-height: 1.65; }
.topic-meta { color: var(--muted); font-size: 0.8rem; margin-top: auto; }
.topic-head .eyebrow { color: var(--muted); font-size: 0.85rem; margin: 0; }
.topic-head .lead { font-size: 1.05rem; margin: 0.25rem 0; }

/* 標籤與徽章 */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  display: inline-block; font-size: 0.85rem; text-decoration: none;
  padding: 0.1rem 0.6rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent);
}
.tag span { color: var(--muted); font-size: 0.75rem; }
.tag-section { scroll-margin-top: 1rem; }
.badge {
  display: inline-block; margin-left: 0.5rem; padding: 0 0.5rem; border-radius: 4px;
  font-size: 0.72rem; font-weight: 500; vertical-align: 0.15em;
  border: 1px solid var(--line); color: var(--muted);
}
.badge-private { border-color: var(--accent); color: var(--accent); }

/* 文章 */
.crumbs { font-size: 0.9rem; }
.crumbs a { text-decoration: none; }
.meta { color: var(--muted); font-size: 0.875rem; margin: 0 0 2rem; }
.meta .tag { margin-left: 0.25rem; }
.ai-note { margin-top: 3rem; padding-top: 1rem; border-top: 1px dashed var(--line); color: var(--muted); font-size: 0.85rem; }

.prose { overflow-wrap: anywhere; }
.prose h1 { font-size: 1.6rem; margin-top: 2.5rem; }
.prose h2 { padding-bottom: 0.3rem; border-bottom: 1px solid var(--line); }
.prose h3 { font-size: 1.12rem; margin: 2rem 0 0.5rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.1rem; }
.prose li + li { margin-top: 0.25rem; }
.prose blockquote {
  margin: 1.25rem 0; padding: 0.5rem 1rem; border-left: 4px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 6px 6px 0;
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose code { font-family: var(--mono); font-size: 0.88em; background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
.prose pre { background: var(--code-bg); padding: 1rem; border-radius: 8px; overflow-x: auto; line-height: 1.55; }
.prose pre code { background: none; padding: 0; font-size: 0.85rem; }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }
.prose mark { background: var(--mark); color: inherit; }
.prose img { border-radius: 6px; }
.table-wrap { overflow-x: auto; margin: 0 0 1.25rem; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.92rem; line-height: 1.6; }
.prose th, .prose td { border: 1px solid var(--line); padding: 0.45rem 0.7rem; text-align: left; vertical-align: top; }
.prose th { background: var(--code-bg); font-weight: 600; }
.prose .footnotes { font-size: 0.88rem; color: var(--muted); }
.prose .header-anchor { text-decoration: none; }

@media (max-width: 600px) {
  body { font-size: 16px; }
  h1, .hero h1 { font-size: 1.6rem; }
  .site-nav { gap: 0.9rem; }
  .brand .aka { display: none; }
}
@media print {
  .site-header, .site-footer, .ai-note { display: none; }
  body { background: #fff; color: #000; }
}