:root{--bg:#f5f7fb;--card:#ffffff;--text:#1b2430;--muted:#5d6978;--accent:#2563eb;--accent-d:#1e4fc4;--line:#e2e7ef;--soft:#eaf0fe;--r:12px}
@media (prefers-color-scheme:dark){:root{--bg:#0e131a;--card:#161d27;--text:#e7ecf2;--muted:#98a3b2;--accent:#5b8def;--accent-d:#7ba3f6;--line:#243040;--soft:#18243a}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);-webkit-text-size-adjust:100%}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
.site-head{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--text)}
.brand:hover{text-decoration:none}
.brand img{width:28px;height:28px}
.nav a{margin-left:22px;color:var(--muted);font-size:15px}
.nav a:hover{color:var(--text);text-decoration:none}
.nav a.btn{color:#fff;margin-left:26px}
.btn{display:inline-block;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:10px 20px;font:inherit;font-weight:600;cursor:pointer;transition:background .2s}
.btn:hover{background:var(--accent-d);text-decoration:none}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}
.btn.ghost:hover{background:var(--soft)}
.hero{padding:64px 0 48px}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero h1{font-size:40px;line-height:1.2;margin:0 0 16px;letter-spacing:-.5px}
.hero p{font-size:18px;color:var(--muted);margin:0 0 28px}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap}
.section{padding:44px 0}
.section h2{font-size:28px;margin:0 0 8px;letter-spacing:-.3px}
.section .lead{color:var(--muted);margin:0 0 28px;max-width:640px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.card h3{margin:12px 0 6px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:15px}
.ico{width:40px;height:40px;border-radius:10px;background:var(--soft);display:flex;align-items:center;justify-content:center}
.ico svg{width:22px;height:22px;stroke:var(--accent);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.steps .card{position:relative;padding-top:48px}
.steps .card:before{counter-increment:s;content:counter(s);position:absolute;top:16px;left:22px;width:26px;height:26px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center}
.previews{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.previews img{border-radius:var(--r);border:1px solid var(--line)}
details{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 20px;margin-bottom:12px}
summary{cursor:pointer;font-weight:600}
details p{margin:10px 0 0;color:var(--muted)}
.site-foot{border-top:1px solid var(--line);margin-top:30px;padding:28px 0;color:var(--muted);font-size:14px}
.site-foot .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
.site-foot a{color:var(--muted);margin-left:18px}
.auth{min-height:calc(100vh - 60px);display:flex;align-items:center;justify-content:center;padding:32px 20px}
.auth .box{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:30px;width:100%;max-width:380px;box-shadow:0 6px 24px rgba(20,30,50,.06)}
.auth h1{margin:0 0 4px;font-size:24px;text-align:center}
.auth .sub{margin:0 0 22px;text-align:center;color:var(--muted);font-size:14px}
.auth label{display:block;font-size:14px;color:var(--muted);margin:0 0 6px}
.auth input{width:100%;padding:11px 12px;margin:0 0 16px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--text);font:inherit}
.auth input:focus{outline:2px solid var(--accent);outline-offset:-1px}
.auth .btn{width:100%}
.auth .msg{min-height:22px;margin:0 0 12px;font-size:14px;color:#d23b3b;text-align:center}
.auth .switch{text-align:center;margin:18px 0 0;font-size:14px;color:var(--muted)}
.page{padding:48px 0}
.page h1{font-size:30px;margin:0 0 18px}
.page h2{font-size:20px;margin:28px 0 8px}
.page p,.page li{color:var(--muted)}
.center{text-align:center;padding:90px 20px}
.center h1{font-size:64px;margin:0;color:var(--accent)}
.center p{color:var(--muted);margin:10px 0 24px}
@media (max-width:820px){
 .hero .wrap{grid-template-columns:1fr}
 .hero h1{font-size:32px}
 .grid,.steps,.previews{grid-template-columns:1fr}
 .nav a:not(.btn){display:none}
}