:root{--bg:#090a0c;--panel:#111318;--card:#15171d;--text:#f4f5f7;--muted:#9ca3af;--line:#292d36;--accent:#d9ff3f}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,Helvetica,sans-serif;line-height:1.5}
a{color:inherit;text-decoration:none}.wrap{max-width:1120px;margin:auto;padding:0 20px}
header{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(9,10,12,.94);backdrop-filter:blur(12px);z-index:10}
.nav{height:68px;display:flex;align-items:center;justify-content:space-between}.logo{font-weight:800;font-size:25px;letter-spacing:-1px}.logo span{color:var(--accent)}
.navlinks{display:flex;gap:20px;color:var(--muted);font-size:14px}.navlinks a:hover{color:var(--text)}
.hero{padding:64px 0 38px}.eyebrow{color:var(--accent);font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.12em}
h1{font-size:clamp(38px,7vw,72px);line-height:.98;letter-spacing:-.05em;margin:12px 0 18px;max-width:800px}
h2{font-size:30px;letter-spacing:-.03em;margin:0 0 12px}h3{margin:0 0 8px}.lead{font-size:18px;color:var(--muted);max-width:680px}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:30px 0 60px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;transition:.2s}.card:hover{border-color:#454b58;transform:translateY(-2px)}
.icon{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:#20241a;color:var(--accent);font-weight:800;margin-bottom:20px}
.muted{color:var(--muted)}.tag{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:5px 9px;font-size:12px;color:var(--muted)}
.calc{max-width:920px;margin:48px auto 70px}.calc-head{margin-bottom:24px}.formgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:7px}input,select{width:100%;padding:14px 15px;border:1px solid var(--line);background:#0d0f13;color:var(--text);border-radius:11px;font-size:16px;outline:none}
input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(217,255,63,.1)}
button{border:0;border-radius:11px;background:var(--accent);color:#10120b;padding:14px 18px;font-size:16px;font-weight:800;cursor:pointer;margin-top:16px}button:hover{background:#e6ff70}
.result{margin-top:22px;background:#0d0f13;border:1px solid var(--line);border-radius:16px;padding:22px}
.result-main{font-size:38px;font-weight:800;letter-spacing:-.04em}.result-main small{font-size:16px;color:var(--muted);font-weight:400}
.rows{display:grid;gap:10px;margin-top:18px}.row{display:flex;justify-content:space-between;gap:20px;padding:9px 0;border-bottom:1px solid #20232a}.row:last-child{border-bottom:0}.row span:first-child{color:var(--muted)}
.note{font-size:12px;color:var(--muted);margin-top:16px;line-height:1.6}.error{color:#ff9f9f;margin-top:10px;font-size:13px}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:13px}
@media(max-width:700px){.navlinks{display:none}.hero{padding-top:42px}.grid,.formgrid{grid-template-columns:1fr}h1{font-size:46px}.card{padding:20px}.calc{margin-top:32px}}