:root{--bg:#F5F8F7;--card:#FFFFFF;--ink:#10282B;--muted:#3C5558;--line:#D5E2DF;--accent:#0B6366;--accent-ink:#FFFFFF;--soft:#E3EEEB;--lav:#ECE9F7;--lav-ink:#3B2F6B;--field:#FFFFFF;color-scheme:light;box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0C1A1C;--card:#13272A;--ink:#E8F1EF;--muted:#A9C0BC;--line:#264246;--accent:#5FC0BE;--accent-ink:#06201F;--soft:#17302F;--lav:#262240;--lav-ink:#D9D3F5;--field:#0C1A1C;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#0C1A1C;--card:#13272A;--ink:#E8F1EF;--muted:#A9C0BC;--line:#264246;--accent:#5FC0BE;--accent-ink:#06201F;--soft:#17302F;--lav:#262240;--lav-ink:#D9D3F5;--field:#0C1A1C;color-scheme:dark}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Manrope',system-ui,-apple-system,'Segoe UI',sans-serif;line-height:1.5}
.wrap{max-width:1000px;margin:0 auto;padding:24px}
.top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.brand{font-weight:800;font-size:20px;color:var(--ink);text-decoration:none}
.back{color:var(--accent);font-weight:700;text-decoration:none;font-size:15px}
h1{font-size:38px;line-height:1.1;letter-spacing:-0.02em;font-weight:800;margin:40px 0 0}
.sub{color:var(--muted);font-size:18px;margin:12px 0 0;max-width:640px}
.grid{display:flex;flex-wrap:wrap;gap:24px;margin-top:32px;align-items:stretch}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px}
.form{flex:1 1 420px}
.result{flex:1 1 360px;background:var(--soft);border-color:transparent;display:flex;flex-direction:column}
.field{margin-bottom:20px}
label,.lab{display:block;font-weight:700;font-size:15px;margin-bottom:8px}
.row{display:flex;gap:10px}
input[type=number],select{min-height:48px;border-radius:12px;border:1px solid var(--line);background:var(--field);color:var(--ink);font-family:inherit;font-size:16px;padding:0 14px;width:100%}
input[type=number]{flex:1 1 0;min-width:0}
select.unit{flex:0 0 96px;width:96px}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px}
.hint{font-size:13px;color:var(--muted);margin:6px 0 0}
.big{font-size:56px;font-weight:800;letter-spacing:-0.03em;line-height:1;color:var(--accent);margin:8px 0 0}
.eq{color:var(--muted);font-size:16px;margin:10px 0 0}
.lbl{font-size:14px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:0.04em}
.bd{margin:24px 0 0;padding:0;list-style:none;border-top:1px solid var(--line)}
.bd li{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:16px}
.bd span:last-child{font-weight:700;text-align:right}
.safety{background:var(--lav);color:var(--lav-ink);border-radius:12px;padding:16px;font-size:14px;margin:24px 0 0}
.warn{display:none;background:var(--lav);color:var(--lav-ink);border-radius:12px;padding:14px 16px;font-size:14px;font-weight:700;margin:16px 0 0}
.note{color:var(--muted);font-size:13px;margin:24px 0 0}
[hidden]{display:none!important}
@media (max-width:520px){h1{font-size:30px}.big{font-size:46px}.card{padding:20px}}