:root{
  --bg:#f5f7fb;
  --card:#ffffff;
  --text:#182033;
  --muted:#647084;
  --line:#dde3ee;
  --soft:#eef3fb;
  --accent:#254f8f;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:24px}
.site-header{
  background:var(--card);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.logo{
  font-weight:800;
  letter-spacing:.2px;
  color:var(--text);
}
.menu{
  display:flex;
  gap:16px;
  flex-wrap:wrap;
}
.menu a{
  color:var(--muted);
  font-size:15px;
}
.hero{
  padding:42px 0 24px;
}
.hero h1{
  font-size:clamp(30px,4vw,52px);
  line-height:1.08;
  margin:0 0 18px;
  letter-spacing:-.04em;
}
.lead{
  color:var(--muted);
  font-size:18px;
  max-width:760px;
}
.chips{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin:22px 0;
}
.chip{
  display:inline-flex;
  padding:7px 11px;
  border:1px solid var(--line);
  background:var(--soft);
  border-radius:999px;
  color:#34445e;
  font-size:14px;
}
.section-title{
  margin-top:36px;
  margin-bottom:14px;
}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:16px;
}
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:18px;
  padding:18px;
  box-shadow:0 8px 24px rgba(25,35,60,.04);
}
.card time,.meta{
  color:var(--muted);
  font-size:14px;
}
.card h3{
  margin:8px 0 8px;
  line-height:1.25;
}
.card p{
  color:var(--muted);
  margin:0 0 12px;
}
.article-page{
  max-width:820px;
  margin:28px auto;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:22px;
  padding:clamp(22px,4vw,44px);
}
.article-page h1{
  font-size:clamp(28px,4vw,44px);
  line-height:1.12;
  margin:8px 0 14px;
  letter-spacing:-.03em;
}
.article-page h2{
  margin-top:32px;
  line-height:1.25;
}
.article-page p{
  color:#2d3748;
}
.article-page .summary{
  color:var(--muted);
  font-size:18px;
}
.related{
  margin-top:34px;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.archive-list{
  display:grid;
  gap:14px;
}
.topic-block{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:18px;
  padding:18px;
  margin:16px 0;
}
.site-footer{
  border-top:1px solid var(--line);
  margin-top:50px;
  color:var(--muted);
}
.footer-links{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
}
@media(max-width:720px){
  .nav{align-items:flex-start;flex-direction:column}
  .wrap{padding:18px}
}