:root{--bg:#f7f6f2;--ink:#18212b;--soft:#56616d;--line:#dedad0;--accent:#1d4f91;--accent2:#b5482a;--card:#fff;--ok:#1d7a4a}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#12161b;--ink:#e9e7e1;--soft:#a6afb9;--line:#2b323a;--accent:#7fb0f0;--accent2:#ee8a6c;--card:#1a1f25;--ok:#5fcf93}}
:root[data-theme="dark"]{--bg:#12161b;--ink:#e9e7e1;--soft:#a6afb9;--line:#2b323a;--accent:#7fb0f0;--accent2:#ee8a6c;--card:#1a1f25;--ok:#5fcf93}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
header.top{border-bottom:1px solid var(--line);background:var(--card)}
header.top .in{max-width:980px;margin:0 auto;padding:12px 16px;display:flex;justify-content:space-between;align-items:center;gap:12px}
.brand{font-weight:800;letter-spacing:.2px;color:var(--ink);text-decoration:none;font-size:1.1rem}
.brand span{color:var(--accent)}
nav a{color:var(--soft);text-decoration:none;margin-left:14px;font-size:.95rem}
main{max-width:980px;margin:0 auto;padding:28px 16px 64px}
main.narrow{max-width:680px}
h1{font-size:2.1rem;line-height:1.15;margin:8px 0 12px}
h2{font-size:1.35rem;margin:40px 0 12px}
h3{font-size:1.05rem;margin:18px 0 6px}
p{margin:0 0 14px}
.lead{font-size:1.15rem;color:var(--soft);max-width:720px}
.small{font-size:.9rem;color:var(--soft)}
.ok{color:var(--ok);font-weight:600}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:14px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px}
.price b{display:block;font-size:2rem;color:var(--accent);line-height:1.1;margin:4px 0}
ul{padding-left:20px;margin:0 0 14px}li{margin:0 0 6px}
.btn{display:inline-block;background:var(--accent);color:#fff;border:0;text-decoration:none;padding:12px 20px;border-radius:8px;font-weight:650;font-size:1rem;cursor:pointer}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.btn:disabled{opacity:.6}
form label{display:block;margin:12px 0 4px;font-weight:600}
input,select,textarea{width:100%;font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink)}
textarea{min-height:80px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:640px){.row{grid-template-columns:1fr}h1{font-size:1.7rem}nav a{margin-left:10px}}
.chk{display:flex;gap:10px;align-items:flex-start;font-weight:400!important}
.chk input{width:20px;height:20px;margin-top:4px;flex:none}
.hp{position:absolute;left:-5000px}
details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:8px 0}
summary{font-weight:650;cursor:pointer}
blockquote{margin:12px 0;padding:12px 16px;border-left:4px solid var(--accent);background:var(--card)}
.note{border:1px solid var(--line);border-radius:10px;padding:12px 16px;background:var(--card);font-size:.95rem}
footer{border-top:1px solid var(--line);color:var(--soft);font-size:.85rem}
footer .in{max-width:980px;margin:0 auto;padding:18px 16px}
#result{margin-top:14px}