:root{
  --bg: #fbfbfc;
  --text: #15171a;
  --muted: #5b616b;
  --card: #ffffff;
  --border: #e6e8ec;
  --link: #2b5cff;
  --max: 980px;
}

*{ box-sizing: border-box; }
body{
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}
.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}
.site-header{
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
.site-header .wrap{
  display: flex;
  gap: 16px;
  align-items: baseline;
  justify-content: space-between;
  padding: 18px 16px;
}
.brand h1{ margin: 0; font-size: 1.35rem; }
.subtitle{ margin: 2px 0 0; color: var(--muted); font-size: .95rem; }

.nav{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.nav a{
  text-decoration: none;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 10px;
}
.nav a:hover{ background: #f2f4f7; color: var(--text); }
.nav a.active{ background: #eef2ff; color: var(--text); }

main.wrap{ padding: 22px 16px 40px; }

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 18px;
  margin: 14px 0;
}
.card h2{ margin: 0 0 8px; font-size: 1.1rem; }
.card h3{ margin: 0 0 8px; font-size: 1.0rem; }

.grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 800px){
  .site-header .wrap{ flex-direction: column; align-items: flex-start; }
  .grid{ grid-template-columns: 1fr; }
}

a{ color: var(--link); }
.links a{ margin-right: 12px; }

.pubs{ padding-left: 18px; }
.site-footer{
  border-top: 1px solid var(--border);
  background: var(--card);
  padding: 18px 0;
  color: var(--muted);
}