:root{--bg:#f7f9fc;--card:#fff;--text:#172033;--muted:#5d6a7e;--line:#dbe3ee;--accent:#2457d6;--soft:#eef4ff}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.55}
a{color:var(--accent);text-decoration:none}.wrap{width:min(1120px,calc(100% - 32px));margin:auto}
header{background:#fff;border-bottom:1px solid var(--line)}.nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{font-size:1.25rem;font-weight:800;color:var(--text)}.brand span{color:var(--accent)}.navlinks{display:flex;gap:18px;flex-wrap:wrap}
.hero{padding:56px 0 34px}.kicker{font-size:.8rem;font-weight:800;text-transform:uppercase;letter-spacing:.12em;color:var(--accent)}
h1{font-size:clamp(2.3rem,5vw,4rem);line-height:1.05;margin:.35rem 0 1rem;letter-spacing:-.04em}h2{font-size:2rem}
.lead{font-size:1.13rem;color:var(--muted);max-width:760px}.section{padding:24px 0 58px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px}
.badge{display:inline-block;background:var(--soft);color:var(--accent);border-radius:999px;padding:5px 10px;font-size:.8rem;font-weight:800}
.btn{display:inline-flex;min-height:46px;padding:0 18px;align-items:center;justify-content:center;border-radius:10px;border:1px solid var(--accent);font-weight:750;cursor:pointer}
.btn-primary{background:var(--accent);color:#fff}.breadcrumbs{font-size:.9rem;color:var(--muted);margin-top:22px}
.tool{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:28px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px}label{display:block;font-weight:750;margin-bottom:7px}input,select{width:100%;min-height:46px;border:1px solid #bfcadb;border-radius:9px;padding:0 12px;font-size:1rem}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.tab{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 12px;font-weight:700;cursor:pointer}.tab.active{background:var(--accent);color:#fff}
.result{margin-top:18px;background:#f2f7ff;border:1px solid #c9dafd;border-radius:12px;padding:18px}.big{font-size:2rem;font-weight:850;color:var(--accent)}.small{font-size:.91rem;color:var(--muted)}
.formula{background:#111827;color:#fff;border-radius:12px;padding:16px;font-family:monospace}.notice{background:#fff9e8;border:1px solid #eed995;border-radius:12px;padding:12px}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:10px 0}summary{font-weight:800;cursor:pointer}
footer{background:#fff;border-top:1px solid var(--line);padding:28px 0;color:var(--muted)}
@media(max-width:800px){.grid{grid-template-columns:1fr 1fr}.tool{grid-template-columns:1fr}.nav{align-items:flex-start;flex-direction:column;padding:14px 0}}
@media(max-width:560px){.grid,.form-row{grid-template-columns:1fr}}

.metric-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.mini{padding:14px;border:1px solid var(--line);border-radius:12px;background:#fff}
.mini strong{display:block;font-size:1.05rem;margin-top:2px}
@media(max-width:650px){.metric-row{grid-template-columns:1fr}}