:root{--ink:#17324d;--muted:#5f7182;--brand:#176b5b;--brand-dark:#0f5145;--bg:#f6f8f7;--card:#fff;--line:#dbe4e0;--accent:#eaf5f1;--danger:#a33a2b;--shadow:0 8px 28px rgba(20,45,50,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth}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-dark)}.wrap{width:min(1100px,92%);margin:auto}
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.nav{min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-weight:800;font-size:1.25rem;text-decoration:none;color:var(--ink)}nav a{margin-left:18px;text-decoration:none;font-weight:600}
.hero{padding:58px 0 34px}.hero h1{font-size:clamp(2rem,5vw,3.3rem);line-height:1.08;margin:.2rem 0 1rem}.hero p{max-width:720px;color:var(--muted);font-size:1.08rem}
.search{width:100%;padding:14px 16px;border:1px solid var(--line);border-radius:12px;font-size:1rem;background:#fff;margin:18px 0}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0 60px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow)}.card h2{font-size:1.12rem;margin-top:0}.card p{color:var(--muted);margin-bottom:14px}.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:10px;padding:11px 16px;text-decoration:none;font-weight:700;cursor:pointer}.btn:hover{background:var(--brand-dark)}
.breadcrumb{font-size:.9rem;color:var(--muted);padding-top:24px}.calc-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:22px;margin:22px 0 48px}.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow)}.panel h2{margin-top:0}.field{margin:14px 0}.field label{display:block;font-weight:700;margin-bottom:6px}.field input,.field select{width:100%;padding:11px 12px;border:1px solid #cbd7d2;border-radius:9px;font:inherit;background:#fff}.field small{color:var(--muted)}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.btn.secondary{background:#eef3f1;color:var(--ink)}.error{color:var(--danger);font-weight:700;margin-top:12px}.result{background:var(--accent);border:1px solid #cde5dc;border-radius:12px;padding:16px;margin:12px 0}.result strong{font-size:1.45rem;display:block}.muted{color:var(--muted)}section.content{margin:0 0 34px}.content h2{margin-top:32px}.faq details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px 16px;margin:9px 0}.faq summary{font-weight:700;cursor:pointer}footer{background:#17324d;color:#fff;padding:34px 0;margin-top:50px}footer a{color:#fff}.notice{font-size:.9rem;color:var(--muted)}
@media(max-width:800px){.grid{grid-template-columns:1fr 1fr}.calc-layout{grid-template-columns:1fr}}@media(max-width:560px){nav a{display:none}.grid{grid-template-columns:1fr}.hero{padding-top:38px}.panel{padding:18px}}

/* Mobile usability */
html{overflow-x:hidden}button,input,select{font-size:16px}button,.btn{min-height:44px}.field input,.field select{min-height:46px} @media(max-width:560px){.wrap{width:min(100% - 28px,1100px)}.nav{min-height:58px}.brand{font-size:1.12rem}.hero{padding:34px 0 22px}.hero h1{font-size:clamp(1.9rem,9vw,2.5rem)}.hero p{font-size:1rem}.grid{gap:14px;margin-bottom:40px}.card{padding:18px}.calc-layout{gap:14px;margin-top:16px}.panel{padding:16px}.panel h2{font-size:1.35rem}.actions{gap:8px}.actions .btn{flex:0 0 auto}.result{padding:14px}.result strong{font-size:1.3rem}.content h2{font-size:1.35rem}footer{padding:28px 0}}