*{box-sizing:border-box;margin:0;padding:0}
:root{--midnight:#0A0E27;--bg2:#0d1230;--cyan:#2BD6F0;--magenta:#BC3CF2;--violet:#6A3CE0;--text:#E7EAF6;--muted:#A8B0D0;--steel:#7e87b0;--line:#262b4d;--glass:rgba(20,26,60,.5);--grad:linear-gradient(135deg,#BC3CF2,#6A3CE0 45%,#2BD6F0)}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,sans-serif;background:var(--midnight);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
.bg{position:fixed;inset:0;z-index:-1;background:radial-gradient(900px 600px at 85% -5%,#1a1f4d 0%,transparent 60%),radial-gradient(700px 600px at 0% 20%,#161a3a 0%,transparent 55%),var(--midnight)}
.nav{position:sticky;top:0;z-index:10;backdrop-filter:blur(12px);background:rgba(10,14,39,.75);border-bottom:1px solid var(--line)}
.nav .in{max-width:1100px;margin:0 auto;padding:16px 22px;display:flex;align-items:center;justify-content:space-between}
.logo{font-family:'Exo 2';font-weight:900;letter-spacing:.04em;color:#fff;font-size:18px}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav a.back{font-size:14px;color:var(--muted)}
.wrap{max-width:740px;margin:0 auto;padding:0 22px}
.crumbs{max-width:740px;margin:26px auto 0;padding:0 22px;font-size:13px;color:var(--steel);font-family:'JetBrains Mono',monospace}
.crumbs a{color:var(--steel)}
article{padding:18px 0 10px}
.cat{display:inline-block;font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan);margin-bottom:14px}
.read{color:var(--steel);font-size:13px;margin-left:10px}
h1{font-family:'Exo 2';font-weight:800;font-size:34px;line-height:1.15;color:#fff;margin:6px 0 8px;letter-spacing:-.01em}
.lead{font-size:18px;color:var(--muted);margin:14px 0 26px;line-height:1.6}
article h2{font-family:'Exo 2';font-weight:800;font-size:23px;color:#fff;margin:34px 0 12px}
article h3{font-size:18px;color:#fff;margin:24px 0 8px}
article p{margin:14px 0;color:#d7dcf2}
article ul,article ol{margin:14px 0 14px 4px;padding-left:22px;color:#d7dcf2}
article li{margin:7px 0}
article b,article strong{color:#fff}
article a{border-bottom:1px solid rgba(43,214,240,.4)}
.note{margin:22px 0;padding:16px 20px;border-radius:14px;background:var(--glass);border:1px solid var(--line);border-left:3px solid var(--cyan);font-size:15px;color:var(--muted)}
.note b{color:var(--text)}
.formula{font-family:'JetBrains Mono',monospace;font-size:14px;background:rgba(43,214,240,.08);border:1px solid rgba(43,214,240,.25);border-radius:10px;padding:12px 14px;color:#cfeaf2;overflow-x:auto}
hr{border:none;border-top:1px solid var(--line);margin:34px 0}
.cta{margin:36px 0 8px;padding:28px 26px;border-radius:18px;background:var(--glass);border:1px solid var(--line)}
.cta h3{font-size:19px;color:#fff;margin-bottom:8px}
.cta p{color:var(--muted);font-size:15px;margin-bottom:16px}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:12px 22px;border-radius:12px;font-weight:600;font-size:15px;border:1px solid transparent}
.btn-primary{background:var(--grad);color:#fff}
.btn-ghost{border-color:rgba(43,214,240,.5);color:var(--cyan)}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.related{margin-top:30px;font-size:14px;color:var(--muted)}
.foot{max-width:740px;margin:40px auto 0;padding:24px 22px 50px;border-top:1px solid var(--line);font-size:13px;color:var(--steel)}
.foot a{color:var(--steel)}
/* индекс */
.idx-head{max-width:740px;margin:0 auto;padding:40px 22px 6px}
.idx-head h1{font-size:32px}
.idx-head p{color:var(--muted);font-size:17px;margin-top:10px}
.cards{max-width:740px;margin:0 auto;padding:18px 22px 10px;display:grid;gap:16px}
.gcard{display:block;padding:24px 24px;border-radius:16px;background:var(--glass);border:1px solid var(--line);transition:.25s}
.gcard:hover{border-color:rgba(43,214,240,.35);transform:translateY(-2px);text-decoration:none}
.gcard .cat{margin-bottom:8px}
.gcard h2{font-family:'Exo 2';font-weight:800;font-size:20px;color:#fff;margin:0 0 6px}
.gcard p{color:var(--muted);font-size:14.5px;margin:0}
.gcard .more{display:inline-block;margin-top:12px;color:var(--cyan);font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:.06em}
@media(max-width:560px){h1{font-size:27px}article h2{font-size:20px}.lead{font-size:16px}}