:root {
  --bg: #faf9f6;
  --fg: #1b1a17;
  --muted: #6f6a62;
  --line: #e7e2d9;
  --accent: #b45309;
  --accent-soft: #f4e7d7;
  --card: #fffdf9;
  --code: #f2eee6;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141311;
    --fg: #e9e5de;
    --muted: #9b948a;
    --line: #2b2723;
    --accent: #e8a33d;
    --accent-soft: #2e2416;
    --card: #1b1916;
    --code: #232019;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}

/* ---------- header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-family: var(--serif); font-weight: 700; font-size: 19px; letter-spacing: .02em; }
.brand span { font-family: var(--sans); font-size: 12px; font-weight: 400; color: var(--muted); margin-left: 10px; letter-spacing: .06em; }
.nav { display: flex; gap: 22px; font-size: 14px; color: var(--muted); }
.nav a:hover { color: var(--accent); }

/* ---------- hero ---------- */
.hero { padding: 76px 0 40px; }
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 22px;
  letter-spacing: .01em;
}
.hero h1 em { font-style: italic; color: var(--accent); }
.lede { font-size: 17px; color: var(--muted); max-width: 660px; margin: 0 0 22px; }
.hero-links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 14px; font-family: var(--mono); }
.hero-author { font-family: var(--mono); font-size: 13px; color: var(--muted); margin: -8px 0 18px; }
.about-lead { font-size: 18px; }
.principles, .drawers { padding-left: 1.2em; }
.principles li, .drawers li { margin: .8em 0; }
.principles b, .drawers b { color: var(--fg); }

/* ---------- 收藏 / 搜索 ---------- */
.article-actions { margin: 0 0 28px; }
.fav-btn {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 14px;
  cursor: pointer;
}
.fav-btn:hover { border-color: var(--accent); color: var(--accent); }
.fav-btn.on { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

.search-box input {
  width: 100%;
  font-size: 17px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--fg);
  outline: none;
}
.search-box input:focus { border-color: var(--accent); }
.index-list { list-style: none; margin: 22px 0 0; padding: 0; border-top: 1px solid var(--line); }
.index-list li { display: flex; justify-content: space-between; align-items: baseline; gap: 18px; padding: 10px 0; border-bottom: 1px dashed var(--line); }
.index-list a { font-family: var(--serif); font-size: 16.5px; }
.index-list time { font-family: var(--mono); font-size: 12px; color: var(--muted); white-space: nowrap; }
.index-list li.empty { color: var(--muted); font-size: 14px; justify-content: flex-start; }

/* ---------- 全站导航 ---------- */
.cross-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; margin-top: 10px; }
.cross-col h2 { font-family: var(--serif); font-size: 18px; margin: 0 0 10px; display: flex; justify-content: space-between; }
.cross-col h2 span { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.cross-col ul { list-style: none; margin: 0; padding: 0; }
.cross-col li { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.cross-col time { font-family: var(--mono); font-size: 11.5px; color: var(--muted); white-space: nowrap; }

/* ---------- 更新日志 ---------- */
.release-list { margin-top: 10px; }
.release { padding: 22px 0; border-bottom: 1px solid var(--line); }
.release-head { display: flex; align-items: baseline; gap: 12px; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.release-v { color: var(--accent); font-weight: 600; }
.release-tag { border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; }
.release h2 { font-family: var(--serif); font-size: 20px; margin: 8px 0 6px; }
.release p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------- 订阅 ---------- */
.subscribe-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 10px; }
.sub-card { border: 1px solid var(--line); border-radius: 14px; padding: 22px; background: var(--card); }
.sub-card h2 { font-family: var(--serif); font-size: 19px; margin: 0 0 10px; }
.sub-card p { margin: 0 0 10px; color: var(--muted); font-size: 14.5px; }
.sub-card a { color: var(--accent); font-family: var(--mono); font-size: 13px; }

/* ---------- 订阅表单 ---------- */
.sub-form { display: flex; gap: 10px; max-width: 520px; }
.sub-form input {
  flex: 1;
  font-size: 16px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--fg);
  outline: none;
}
.sub-form input:focus { border-color: var(--accent); }
.sub-form button {
  font-size: 15px;
  padding: 0 22px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-family: var(--sans);
}
.sub-form button:hover { opacity: .9; }
.sub-msg { min-height: 22px; font-size: 14px; margin: 10px 0 0; color: var(--muted); }
.sub-msg.ok { color: #1a7f37; }
.sub-msg.err { color: #b42318; }
.sub-note { font-size: 13px; color: var(--muted); margin: 4px 0 26px; }

/* ---------- 文章底部订阅 CTA ---------- */
.sub-cta {
  margin: 48px 0 0;
  padding: 26px 26px 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
}
.sub-cta-title { font-family: var(--serif); font-size: 20px; margin: 0 0 6px; }
.sub-cta-desc { color: var(--muted); font-size: 14.5px; margin: 0 0 16px; }

/* ---------- 首页产品条 ---------- */
.promo {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 28px 30px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--card), transparent);
}
.promo-text h2 { font-family: var(--serif); font-size: 22px; margin: 0 0 8px; }
.promo-text p { color: var(--muted); font-size: 15px; margin: 0; max-width: 560px; }
.promo-btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 14px;
  padding: 11px 20px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  white-space: nowrap;
}
.promo-btn:hover { color: #fff; opacity: .92; }
.hero-links .promo-btn,
.sub-cta .promo-btn { color: #fff !important; border-bottom: none; }

/* ---------- /pro/ 产品页 ---------- */
.pro-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 8px; }
.pro-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.pro-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.pro-head h2 { font-family: var(--serif); font-size: 19px; margin: 0; }
.pro-status { font-family: var(--mono); font-size: 11.5px; color: var(--accent); background: var(--accent-soft); padding: 2px 8px; border-radius: 999px; white-space: nowrap; }
.pro-desc { color: var(--muted); font-size: 14.5px; margin: 0; flex: 1; }
.pro-foot { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; border-top: 1px dashed var(--line); padding-top: 12px; }
.pro-price { font-family: var(--mono); font-size: 17px; color: var(--fg); font-weight: 600; }
.pro-note { font-size: 12px; color: var(--muted); }
.pro-rights { font-size: 13.5px; color: var(--muted); line-height: 1.9; border-top: 1px dashed var(--line); padding-top: 12px; }

/* ---------- 赞赏码 ---------- */
.reward-card { display: flex; gap: 26px; align-items: center; flex-wrap: wrap; }
.reward-qr {
  width: 220px; height: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 8px;
}
.hero-links a { color: var(--accent); border-bottom: 1px solid transparent; }
.hero-links a:hover { border-color: var(--accent); }

/* ---------- sections ---------- */
.section-block { padding: 26px 0; }
.block-head { display: flex; align-items: baseline; justify-content: space-between; margin: 0 0 8px; }
.block-head h2 { font-family: var(--serif); font-size: 24px; margin: 0; }
.block-head a { font-size: 14px; color: var(--muted); }
.block-head a:hover { color: var(--accent); }
.sec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}
.sec-card {
  display: flex; flex-direction: column; gap: 6px;
  padding: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  transition: border-color .15s, transform .15s;
}
.sec-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.sec-card b { font-family: var(--serif); font-size: 17px; }
.sec-card span { font-size: 13px; color: var(--muted); line-height: 1.5; }
.sec-card i { font-style: normal; font-family: var(--mono); font-size: 12px; color: var(--accent); margin-top: 4px; }

/* ---------- post list ---------- */
.post-list { border-top: 1px solid var(--line); }
.post-item {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 26px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.post-date { font-family: var(--mono); font-size: 13px; color: var(--muted); padding-top: 5px; }
.post-main h2 {
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.45;
  margin: 0 0 8px;
  font-weight: 600;
}
.post-desc {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 15px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; font-size: 12.5px; color: var(--muted); font-family: var(--mono); }
.tag {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--sans);
  font-size: 12px;
}

/* ---------- article ---------- */
.article { max-width: 780px; padding: 52px 24px 72px; }
.crumbs { font-family: var(--mono); font-size: 12.5px; color: var(--muted); display: flex; gap: 8px; margin-bottom: 26px; }
.crumbs a:hover { color: var(--accent); }
.article-title { font-family: var(--serif); font-size: clamp(26px, 4vw, 36px); line-height: 1.35; margin: 0 0 16px; }
.article-meta { font-family: var(--mono); font-size: 13px; color: var(--muted); margin: 0 0 16px; }
.article-lede {
  font-size: 17px; color: var(--muted); line-height: 1.8;
  margin: 0 0 30px; padding-bottom: 24px; border-bottom: 1px solid var(--line);
}
.toc {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 16px 22px 18px;
  margin: 0 0 34px;
  font-size: 14px;
}
.toc-title { font-family: var(--mono); font-size: 12px; letter-spacing: .1em; color: var(--muted); margin: 0 0 8px; text-transform: uppercase; }
.toc ol { margin: 0; padding-left: 18px; }
.toc li { margin: 3px 0; }
.toc-h3 { margin-left: 12px !important; font-size: 13px; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--accent); }

.prose { font-family: var(--serif); font-size: 17.5px; line-height: 1.95; }
.prose p { margin: 1.1em 0; }
.prose h2 { font-size: 24px; margin: 2.2em 0 .7em; line-height: 1.4; scroll-margin-top: 80px; }
.prose h3 { font-size: 19px; margin: 1.7em 0 .5em; color: var(--fg); scroll-margin-top: 80px; }
.prose h2::before { content: "§ "; color: var(--accent); font-size: .8em; }
.prose blockquote {
  margin: 1.4em 0; padding: 4px 0 4px 20px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: .4em 0; }
.prose img { border-radius: 10px; margin: 1.4em 0; border: 1px solid var(--line); }
.prose code { font-family: var(--mono); font-size: .85em; background: var(--code); padding: 1px 5px; border-radius: 5px; }
.prose pre { background: var(--code); padding: 16px; border-radius: 10px; overflow-x: auto; font-size: 13.5px; line-height: 1.6; }
.prose pre code { background: none; padding: 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.6em 0; }
.prose table { width: 100%; border-collapse: collapse; font-family: var(--sans); font-size: 14px; margin: 1.4em 0; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.prose th { background: var(--card); }
.prose a { border-bottom: 1px solid var(--line); }
.prose a:hover { color: var(--accent); border-color: var(--accent); }

.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 48px 0 0; }
.pn {
  display: flex; flex-direction: column; gap: 6px;
  padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px;
  background: var(--card);
}
.pn span { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.pn b { font-family: var(--serif); font-size: 15px; font-weight: 600; line-height: 1.5; }
.pn:hover { border-color: var(--accent); }
.pn.next { text-align: right; }
.pn.next span, .pn.next b { align-self: flex-end; }

.related { margin-top: 44px; border-top: 1px solid var(--line); padding-top: 26px; }
.related h2 { font-family: var(--serif); font-size: 18px; margin: 0 0 14px; }
.related ul { list-style: none; margin: 0; padding: 0; }
.related li { display: flex; justify-content: space-between; gap: 16px; padding: 9px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.related li span { font-family: var(--mono); font-size: 12px; color: var(--muted); white-space: nowrap; }

/* ---------- section / archive ---------- */
.section-head { padding: 58px 0 10px; }
.section-head h1 { font-family: var(--serif); font-size: 34px; margin: 0 0 12px; }
.section-head .lede { margin-bottom: 0; }
.year-block { margin: 34px 0; }
.year-block h2 { font-family: var(--mono); font-size: 15px; color: var(--accent); letter-spacing: .1em; border-bottom: 1px solid var(--line); padding-bottom: 8px; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-list li { display: flex; justify-content: space-between; align-items: baseline; gap: 18px; padding: 9px 0; border-bottom: 1px dashed var(--line); font-family: var(--serif); font-size: 16.5px; }
.a-date { font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* ---------- footer ---------- */
.site-foot { border-top: 1px solid var(--line); margin-top: 60px; padding: 34px 0 40px; }
.site-foot p { margin: 5px 0; }
.foot-mono { font-family: var(--mono); font-size: 13px; }
.foot-links { font-size: 13.5px; color: var(--muted); display: flex; gap: 10px; flex-wrap: wrap; }
.foot-links a:hover { color: var(--accent); }
.foot-legal { font-size: 12.5px; color: var(--muted); }

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .hero { padding: 48px 0 26px; }
  .post-item { display: block; }
  .post-date { padding: 0 0 6px; }
  .article { padding: 34px 18px 56px; }
  .post-nav { grid-template-columns: 1fr; }
  .brand span { display: none; }
  .nav { gap: 16px; font-size: 13px; }
}