:root {
  --bg: #fff;
  --surface: #f6f7f5;
  --text: #202521;
  --muted: #747b75;
  --line: #e6e9e5;
  --accent: #2a7f62;
  --code: #f1f3f1;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

.shell { width: min(720px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 54px 0 34px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: block;
  width: 42px;
  height: 42px;
  border: 1px solid var(--text);
  border-radius: 50%;
  object-fit: cover;
}
.brand strong, .brand small { display: block; }
.brand strong { font-size: 17px; letter-spacing: .05em; }
.brand small { color: var(--muted); font-size: 12px; }

nav { display: flex; flex-wrap: wrap; gap: 18px; }
nav a { color: var(--muted); font-family: var(--mono); font-size: 13px; }

main { min-height: 62vh; }

.intro { padding: 76px 0 84px; border-bottom: 1px solid var(--line); }
.intro h1 { max-width: 610px; margin: 7px 0 13px; font-size: clamp(31px, 7vw, 52px); line-height: 1.25; letter-spacing: -.035em; }
.intro > p:last-child { max-width: 560px; margin: 0; color: var(--muted); font-size: 17px; }
.eyebrow { margin: 0; color: var(--accent); font-family: var(--mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }

.post-list { padding: 50px 0 10px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 12px; }
.section-heading h2 { margin: 0; font-size: 18px; }
.section-heading > a { color: var(--muted); font-size: 13px; }

.post-row { display: grid; grid-template-columns: 92px 1fr; gap: 22px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.post-row time, .archive-row time { color: var(--muted); font-family: var(--mono); font-size: 12px; }
.post-row h3 { margin: -4px 0 4px; font-size: 20px; line-height: 1.5; }
.excerpt { color: var(--muted); font-size: 14px; }
.meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 9px; }
.meta a { color: var(--accent); font-family: var(--mono); font-size: 12px; }

.page-heading, .post-header { padding: 70px 0 38px; border-bottom: 1px solid var(--line); }
.page-heading h1, .post-header h1 { margin: 6px 0 0; font-size: clamp(30px, 6vw, 45px); line-height: 1.35; letter-spacing: -.025em; }

.post .prose { padding: 42px 0 24px; }
.prose h2, .prose h3 { margin-top: 2.2em; line-height: 1.45; }
.prose img { max-width: 100%; border-radius: 3px; }
.prose a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.prose blockquote { margin: 1.5em 0; padding: 4px 0 4px 20px; border-left: 2px solid var(--accent); color: var(--muted); }
.prose code { padding: .15em .38em; border-radius: 4px; background: var(--code); font-family: var(--mono); font-size: .88em; }
.prose pre { overflow-x: auto; padding: 18px 20px; border: 1px solid var(--line); border-radius: 7px; background: var(--code); line-height: 1.6; }
.prose pre code { padding: 0; background: transparent; }

.archive { padding-bottom: 40px; }
.archive-year { margin: 42px 0 9px; color: var(--muted); font-family: var(--mono); font-size: 14px; }
.archive-row { display: grid; grid-template-columns: 70px 1fr; gap: 18px; padding: 12px 0; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 12px; padding: 40px 0; }
.tag-cloud a { padding: 7px 12px; border: 1px solid var(--line); border-radius: 999px; font-family: var(--mono); font-size: 13px; }
.tag-cloud sup { margin-left: 5px; color: var(--muted); }

.pagination, .post-nav { justify-content: space-between; gap: 24px; padding: 38px 0; border-top: 1px solid var(--line); }
.post-nav > div { display: grid; max-width: 48%; }
.post-nav > div:last-child { text-align: right; }
.post-nav small { color: var(--muted); font-family: var(--mono); font-size: 11px; }

.site-footer { display: flex; justify-content: space-between; gap: 18px; margin-top: 60px; padding: 28px 0 42px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: 11px; }

@media (max-width: 620px) {
  .site-header { align-items: flex-start; flex-direction: column; padding-top: 34px; }
  .intro { padding: 52px 0 62px; }
  .post-row { grid-template-columns: 1fr; gap: 4px; }
  .archive-row { grid-template-columns: 58px 1fr; }
  .site-footer { flex-direction: column; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #181b19;
    --surface: #202421;
    --text: #e8ece8;
    --muted: #9aa29b;
    --line: #303631;
    --accent: #72c7a3;
    --code: #222724;
  }
}