:root{--ink:#17202a;--muted:#5b6b7a;--brand:#0b5cad;--brand2:#084a8a;--bg:#f6f8fa;--card:#fff;--line:#dde5ec;--ok:#0a7a42}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
a{color:var(--brand)}header{background:#fff;border-bottom:1px solid var(--line)}
.wrap{max-width:980px;margin:0 auto;padding:0 18px}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 0;flex-wrap:wrap;gap:10px}
.logo{font-weight:800;font-size:1.25rem;color:var(--ink);text-decoration:none}.logo span{color:var(--brand)}
.nav nav a{margin-left:16px;color:var(--ink);text-decoration:none;font-size:.95rem}.nav nav a:hover{color:var(--brand)}
.hero{padding:44px 0 10px}.hero h1{font-size:2rem;line-height:1.2;margin:0 0 10px}.hero p{color:var(--muted);max-width:640px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;padding:22px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.card h3{margin:0 0 6px;font-size:1.05rem}.card p{color:var(--muted);font-size:.92rem;margin:0 0 12px}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:9px 16px;border-radius:8px;text-decoration:none;font-weight:600;border:0;cursor:pointer;font-size:.95rem}
.btn:hover{background:var(--brand2)}
main{padding-bottom:40px}h1{font-size:1.7rem;line-height:1.25}h2{margin-top:30px;font-size:1.25rem}
.calc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;margin:20px 0}
label{display:block;font-weight:600;font-size:.9rem;margin:12px 0 4px}
input,select{width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;font-size:1rem;background:#fff}
.result{margin-top:18px;background:#eef7f1;border:1px solid #bfe3cf;border-radius:10px;padding:16px;display:none}
.result strong{color:var(--ok)}
table{width:100%;border-collapse:collapse;margin:14px 0}th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;font-size:.93rem}th{background:#f0f4f8}
.note{color:var(--muted);font-size:.88rem}.disclaimer{background:#fff8e6;border:1px solid #f0dfa8;border-radius:10px;padding:14px;font-size:.9rem}
footer{background:#fff;border-top:1px solid var(--line);padding:24px 0;color:var(--muted);font-size:.9rem}
footer a{margin-right:14px}
@media(max-width:600px){.hero h1{font-size:1.55rem}h1{font-size:1.4rem}}
.result.error{background:#fdf0f0;border-color:#eec5c5;color:#7a1f1f}
.result.error strong{color:#7a1f1f}
:focus-visible{outline:3px solid #7db3e8;outline-offset:2px}
.related{margin-top:28px;padding-top:14px;border-top:1px solid var(--line)}