:root{--bg:#f6f7f9;--card:#fff;--ink:#0f1b2d;--mut:#5a6b82;--line:#e2e7ee;--acc:#f5b942;--acc2:#1f6feb;--ok:#e8f6ee}
@media (prefers-color-scheme:dark){:root{--bg:#0d1520;--card:#142133;--ink:#e8eef6;--mut:#9fb0c8;--line:#24354d;--ok:#16301f}}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink)}
a{color:var(--acc2)}header{background:#0f1b2d;color:#fff}header .w{display:flex;align-items:center;justify-content:space-between;padding:14px 16px}
header a{color:#fff;text-decoration:none;font-weight:700}header nav a{font-weight:500;margin-left:16px;opacity:.85;font-size:15px}
.w{max-width:980px;margin:0 auto;padding:0 16px}h1{font-size:clamp(26px,4vw,36px);line-height:1.15;margin:28px 0 8px}h2{margin-top:32px;font-size:22px}
.lead{color:var(--mut);font-size:18px;margin:0 0 20px}.tool{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:760px){.tool{grid-template-columns:1fr}header nav{display:none}}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px}
form label{display:block;margin-bottom:14px}form label>span{display:block;font-weight:600;font-size:14px;margin-bottom:4px}
form small{display:block;color:var(--mut);font-size:13px;margin-top:3px}.in{display:flex;align-items:center;gap:8px}
input,select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:var(--bg);color:var(--ink)}
.in em{font-style:normal;color:var(--mut)}label.ck{display:flex;gap:8px;align-items:flex-start}label.ck input{width:auto;margin-top:5px}label.ck span{font-weight:500}
.res .r{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}.res .r span{color:var(--mut)}.res .r b{white-space:nowrap}
.res .strong{background:var(--ok);margin:6px -10px;padding:12px 10px;border-radius:10px;border:0}.res .strong span{color:var(--ink);font-weight:600}.res .strong b{font-size:22px}
.note{font-size:14px;color:var(--mut)}.warn{color:#b3261e}.formula{background:var(--card);border-left:4px solid var(--acc);padding:10px 14px;font-weight:600;border-radius:6px}
table{border-collapse:collapse;width:100%;background:var(--card)}td,th{border:1px solid var(--line);padding:8px;text-align:left}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:24px 0}.grid a{display:block;text-decoration:none;color:inherit}
.grid .card:hover{border-color:var(--acc)}.grid h3{margin:0 0 6px}.grid p{margin:0;color:var(--mut);font-size:15px}
.promo{display:flex;gap:16px;align-items:center;justify-content:space-between;background:#0f1b2d;color:#fff;border-radius:14px;padding:18px 20px;margin:32px 0}
.promo a.btn{background:var(--acc);color:#0f1b2d;font-weight:700;padding:10px 16px;border-radius:10px;text-decoration:none;white-space:nowrap}
@media(max-width:760px){.promo{flex-direction:column;align-items:flex-start}}
details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:10px 0}summary{font-weight:600;cursor:pointer}
.ad{margin:24px 0;min-height:0}.small{font-size:14px;color:var(--mut)}footer{margin-top:48px;padding:24px 0;border-top:1px solid var(--line);color:var(--mut);font-size:14px}
.upd{font-size:13px;color:var(--mut)}