:root{--bg:#f7f8fb;--card:#fff;--text:#16181d;--muted:#667085;--line:#e6e8ee;--brand:#2d5bff;--brand-dark:#1737a8;--radius:18px;--shadow:0 8px 30px rgba(20,30,60,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.55}a{color:inherit;text-decoration:none}.container{width:min(1120px,calc(100% - 32px));margin:0 auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(247,248,251,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-weight:800;font-size:1.35rem;letter-spacing:-.02em}.brand span{color:var(--brand)}.nav{display:flex;gap:18px;flex-wrap:wrap;font-size:.95rem;color:#353845}.hero{padding:64px 0 34px}.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:36px;align-items:center}.eyebrow{font-size:.82rem;font-weight:700;color:var(--brand);text-transform:uppercase;letter-spacing:.08em}h1{font-size:clamp(2.1rem,5vw,4.2rem);line-height:1.03;letter-spacing:-.045em;margin:.3rem 0 1rem}h2{font-size:clamp(1.5rem,3vw,2.4rem);line-height:1.12;letter-spacing:-.03em}h3{letter-spacing:-.02em}.lead{font-size:1.1rem;color:var(--muted);max-width:720px}.search{display:flex;gap:10px;padding:10px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}.search input{flex:1;border:0;outline:0;font-size:1rem;padding:12px}.btn{border:0;border-radius:12px;background:var(--brand);color:#fff;font-weight:700;padding:12px 18px;cursor:pointer}.btn:hover{background:var(--brand-dark)}.hero-card,.card,.calc-card,.content-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.hero-card{padding:24px}.section{padding:34px 0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{padding:22px;transition:.2s transform,.2s box-shadow}.card:hover{transform:translateY(-2px);box-shadow:0 12px 34px rgba(20,30,60,.11)}.card p{margin:.4rem 0 0;color:var(--muted)}.tag{display:inline-flex;border-radius:999px;padding:5px 9px;background:#eef2ff;color:var(--brand);font-size:.75rem;font-weight:700}.calc-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(260px,.75fr);gap:24px;align-items:start}.calc-card{padding:24px}.field-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}label{display:block;font-weight:700;font-size:.9rem;margin-bottom:6px}input,select{width:100%;border:1px solid #d9dde7;border-radius:12px;padding:12px 13px;font-size:1rem;background:#fff}.result{margin-top:18px;padding:18px;border-radius:14px;background:#f1f5ff;border:1px solid #d7e1ff}.result strong{display:block;font-size:1.7rem;color:var(--brand-dark);letter-spacing:-.03em}.sidebar{display:grid;gap:16px}.sidebox{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.muted{color:var(--muted)}.prose{max-width:820px}.prose p,.prose li{color:#3e4350}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.footer{margin-top:48px;border-top:1px solid var(--line);padding:30px 0 50px;color:var(--muted);font-size:.92rem}.footer-grid{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.small{font-size:.86rem}@media(max-width:820px){.hero-grid,.calc-layout{grid-template-columns:1fr}.grid,.related{grid-template-columns:1fr 1fr}.nav{display:none}}@media(max-width:560px){.container{width:min(100% - 22px,1120px)}.hero{padding-top:38px}.grid,.related,.field-grid{grid-template-columns:1fr}.search{flex-direction:column}.btn{width:100%}}