:root{
  --bg:#020617;
  --card:rgba(10,16,35,.88);
  --panel:rgba(6,12,30,.82);
  --line:rgba(167,139,250,.30);
  --text:#f4f7ff;
  --muted:#b8c3e6;
  --accent:#a78bfa;
  --cyan:#67e8f9;
  --pink:#f0abfc;
  --gold:#fde68a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--text);
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
  line-height:1.72;
  background:
    radial-gradient(circle at 18% 12%,rgba(103,232,249,.18),transparent 28%),
    radial-gradient(circle at 84% 16%,rgba(167,139,250,.22),transparent 30%),
    radial-gradient(circle at 50% 92%,rgba(240,171,252,.12),transparent 30%),
    linear-gradient(135deg,#020617 0%,#0a1026 48%,#050016 100%);
}
body:before{
  content:"";
  position:fixed;inset:0;pointer-events:none;
  background:
    radial-gradient(circle at 20% 20%,rgba(255,255,255,.58) 0 1px,transparent 1.6px),
    radial-gradient(circle at 70% 28%,rgba(255,255,255,.42) 0 1px,transparent 1.5px),
    radial-gradient(circle at 32% 78%,rgba(255,255,255,.35) 0 1px,transparent 1.4px),
    linear-gradient(rgba(167,139,250,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(103,232,249,.03) 1px,transparent 1px);
  background-size:180px 180px,240px 240px,210px 210px,44px 44px,44px 44px;
}
.site-shell{max-width:1240px;margin:0 auto;padding:30px 18px 56px}
.hero{
  border:1px solid var(--line);
  border-radius:32px;
  padding:34px;
  background:
    radial-gradient(circle at 88% 18%,rgba(103,232,249,.16),transparent 28%),
    linear-gradient(135deg,rgba(15,23,42,.94),rgba(20,10,45,.76));
  box-shadow:0 26px 90px rgba(0,0,0,.42),inset 0 0 70px rgba(167,139,250,.08);
  overflow:hidden;position:relative;
}
.hero:before{
  content:"";position:absolute;right:-70px;top:-70px;width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%,rgba(255,255,255,.9),rgba(103,232,249,.55) 20%,rgba(167,139,250,.18) 58%,transparent 72%);
  box-shadow:0 0 80px rgba(103,232,249,.32);
}
.hero:after{
  content:"астрономия • космология • астрофизика • наблюдения";
  position:absolute;right:-88px;bottom:12px;color:rgba(167,139,250,.15);font-size:36px;font-weight:900;letter-spacing:.04em;transform:rotate(-4deg);white-space:nowrap;
}
.hero h1{position:relative;z-index:1;margin:0;max-width:920px;font-size:clamp(34px,5vw,62px);line-height:1.04;letter-spacing:-.04em}
.hero p{position:relative;z-index:1;color:var(--muted);max-width:850px;margin:16px 0 0;font-size:18px}
.layout{display:grid;grid-template-columns:310px minmax(0,1fr);gap:22px;margin-top:22px}
.sidebar{position:sticky;top:18px;align-self:start;border:1px solid var(--line);border-radius:24px;background:var(--panel);padding:16px;box-shadow:0 14px 46px rgba(0,0,0,.34)}
.sidebar h2{margin:0 0 12px;color:#ddd6fe;font-size:15px;letter-spacing:.08em;text-transform:uppercase}
.navlink{display:block;padding:9px 11px;color:var(--text);text-decoration:none;border:1px solid transparent;border-radius:14px}
.navlink:hover{color:#e0f2fe;background:rgba(103,232,249,.10);border-color:rgba(103,232,249,.26)}
.page-card{border:1px solid var(--line);border-radius:28px;padding:30px;background:var(--card);box-shadow:0 18px 64px rgba(0,0,0,.34);overflow:hidden}
.page-card h1{margin:0 0 18px;font-size:clamp(30px,4vw,48px);line-height:1.12}
.page-card h2{margin-top:30px;padding-top:14px;border-top:1px solid rgba(167,139,250,.20);color:#ddd6fe}
.page-card h3{color:#bae6fd;margin-top:24px}
p{margin:13px 0}a{color:#67e8f9;text-decoration:none;border-bottom:1px solid rgba(103,232,249,.35)}a:hover{color:#e0f2fe;border-bottom-color:#e0f2fe}.unresolved-link{color:#fde68a}
.content-list{padding-left:24px}.content-list li{margin:8px 0}
code{color:#f0abfc;background:rgba(240,171,252,.09);border:1px solid rgba(240,171,252,.22);padding:2px 6px;border-radius:7px}
pre{overflow:auto;padding:16px;border-radius:16px;border:1px solid rgba(167,139,250,.20);background:rgba(2,6,23,.72)}
blockquote{margin:18px 0;padding:14px 18px;border-left:4px solid var(--cyan);background:rgba(103,232,249,.08);border-radius:12px}
.math-block{overflow-x:auto;margin:18px 0;padding:16px;border:1px solid rgba(167,139,250,.25);background:rgba(15,23,42,.62);border-radius:16px}
.table-scroll{overflow-x:auto;margin:18px 0}table{border-collapse:collapse;min-width:520px;width:100%;background:rgba(15,23,42,.45)}td,th{border:1px solid rgba(167,139,250,.22);padding:10px 12px}th{background:rgba(167,139,250,.14);color:#ede9fe}
.grid-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px;margin-top:20px}
.tile{display:block;border:1px solid rgba(167,139,250,.25);border-radius:22px;padding:18px;background:radial-gradient(circle at 86% 18%,rgba(103,232,249,.12),transparent 30%),rgba(15,23,42,.52);min-height:146px;position:relative;overflow:hidden}
.tile:after{content:"";position:absolute;width:96px;height:96px;right:-30px;bottom:-30px;border-radius:50%;border:1px solid rgba(103,232,249,.18)}
.tile h3{margin:0 0 8px;color:#ddd6fe}.tile p{color:var(--muted)}
.cosmo-mark{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:18px;margin-bottom:12px;border:1px solid rgba(103,232,249,.35);background:radial-gradient(circle at 35% 30%,rgba(255,255,255,.8),rgba(103,232,249,.25) 45%,rgba(167,139,250,.18) 100%);box-shadow:0 0 24px rgba(103,232,249,.22);font-size:27px;color:#f8fafc}
.cosmo-hero{display:flex;align-items:center;gap:18px;padding:18px;margin:0 0 20px;border:1px solid rgba(167,139,250,.22);border-radius:22px;background:rgba(3,7,18,.36)}.cosmo-hero .cosmo-mark{margin:0;flex:0 0 auto}
.sky-map{position:relative;height:240px;margin:24px 0;border:1px solid rgba(167,139,250,.22);border-radius:24px;background:radial-gradient(circle at 50% 50%,rgba(103,232,249,.15),rgba(3,7,18,.48) 42%,rgba(3,7,18,.20) 100%);overflow:hidden}.sky-map:before,.sky-map:after{content:"";position:absolute;border:1px solid rgba(103,232,249,.18);border-radius:50%;left:50%;top:50%;transform:translate(-50%,-50%)}.sky-map:before{width:280px;height:120px}.sky-map:after{width:440px;height:190px}.sky-map .star-core{position:absolute;left:50%;top:50%;width:48px;height:48px;transform:translate(-50%,-50%);border-radius:50%;background:radial-gradient(circle,#fff 0 8%,#67e8f9 22%,#a78bfa 70%);box-shadow:0 0 44px rgba(103,232,249,.55)}
.back{display:inline-flex;margin-bottom:18px;color:#e0f2fe;background:rgba(103,232,249,.10);border:1px solid rgba(103,232,249,.30);border-radius:999px;padding:8px 12px}
@media(max-width:900px){.layout{grid-template-columns:1fr}.sidebar{position:static}.page-card{padding:22px}.hero:before{opacity:.35}}