:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1f2523;
  --muted: #6f7772;
  --line: #e3e1da;
  --accent: #0f766e;
  --accent-soft: #d9f0ec;
  --code-bg: #efeee9;
  --radius: 14px;
  --max: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141715;
    --surface: #1b201d;
    --text: #e8ece9;
    --muted: #9aa39d;
    --line: #2b322e;
    --accent: #6ee7d8;
    --accent-soft: #173a36;
    --code-bg: #222824;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.site-header {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 22px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.15rem;
}
.brand span { color: var(--accent); margin-left: 3px; font-weight: 500; }

.site-header nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-header nav a { color: var(--muted); font-size: 0.93rem; }
.site-header nav a:hover { color: var(--text); }

main { max-width: var(--max); margin: 0 auto; padding: 28px 22px 60px; }

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero { padding: 46px 0 38px; border-bottom: 1px solid var(--line); }
.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6.5vw, 3.35rem);
  line-height: 1.2;
  letter-spacing: -0.045em;
}
.lede { max-width: 600px; margin: 18px 0 0; color: var(--muted); font-size: 1.02rem; }
.hero-links { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; margin-top: 26px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 650;
  font-size: 0.92rem;
}
.button:hover { text-decoration: none; filter: brightness(1.06); }
.text-link { color: var(--accent); font-size: 0.92rem; }

.section { padding: 34px 0 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.section h2 { margin: 0; font-size: 1.25rem; letter-spacing: -0.02em; }

.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 16px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.card h3 { margin: 8px 0 8px; font-size: 1.02rem; line-height: 1.4; }
.card h3 a { color: var(--text); }
.card p:last-child { margin-bottom: 0; color: var(--muted); font-size: 0.92rem; }
.meta { margin: 0; color: var(--muted); font-size: 0.76rem; letter-spacing: 0.02em; }

.callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 34px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.callout h2 { margin: 0 0 6px; }
.callout p:last-child { margin: 0; color: var(--muted); font-size: 0.92rem; }

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8rem;
}
.site-footer p { margin: 4px 0; }

article.post { padding-top: 22px; }
article.post h1 { margin: 0 0 8px; font-size: clamp(1.65rem, 5vw, 2.35rem); line-height: 1.25; letter-spacing: -0.035em; }
article.post .meta { margin-bottom: 24px; }
article.post h2 { margin: 30px 0 10px; font-size: 1.22rem; }
article.post p { margin: 0 0 16px; }
article.post ul, article.post ol { padding-left: 1.35em; margin: 0 0 18px; }
article.post li { margin: 5px 0; }
article.post blockquote { margin: 20px 0; padding: 12px 18px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; color: var(--text); }
article.post code { background: var(--code-bg); padding: 2px 6px; border-radius: 5px; font-size: 0.88em; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
article.post pre { overflow-x: auto; padding: 16px; border-radius: 10px; background: var(--code-bg); }
article.post pre code { padding: 0; background: none; }
.back { display: inline-block; margin-bottom: 14px; color: var(--muted); font-size: 0.88rem; }

.dl-list { list-style: none; padding: 0; margin: 20px 0 0; border-top: 1px solid var(--line); }
.dl-list li { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.dl-list .name { font-weight: 600; }
.dl-list .desc { display: block; margin-top: 2px; color: var(--muted); font-size: 0.84rem; font-weight: 400; }
.dl-list .size { color: var(--muted); font-size: 0.8rem; white-space: nowrap; }
.dl-list a { font-size: 0.88rem; }

.notice { margin: 18px 0; padding: 12px 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--muted); font-size: 0.88rem; }

@media (max-width: 620px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: 10px; padding-top: 22px; }
  .site-header nav { gap: 14px; }
  .hero { padding-top: 32px; }
  .cards { grid-template-columns: 1fr; }
  .callout { align-items: flex-start; flex-direction: column; }
  .dl-list li { align-items: flex-start; flex-direction: column; gap: 6px; }
}