:root{--blue:#1769e8;--ink:#142033;--muted:#50627d;--line:#dce3ec;--bg:#f6f8fb;--card:#fff;--soft:#eef5ff;--max:1120px;--green:#16794c}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{font-size:20px;font-weight:800;color:#111;white-space:nowrap}.logo span{color:var(--blue)}nav{display:flex;gap:24px;font-size:14px;flex-wrap:wrap;justify-content:flex-end}nav a{color:#24334b;font-weight:600}
.hero{padding:82px 0 68px;background:linear-gradient(180deg,#edf5ff 0%,#f8fafc 100%)}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.1em;font-weight:800;color:var(--blue)}h1{font-size:48px;line-height:1.08;margin:10px 0 20px;letter-spacing:-.03em}h2{font-size:28px;line-height:1.25;margin:42px 0 12px}h3{font-size:20px;line-height:1.3;margin:0 0 10px}p{color:var(--muted);font-size:16px}.hero p{max-width:800px;font-size:18px}.btn{display:inline-block;background:var(--blue);color:#fff!important;border:0;border-radius:10px;padding:11px 17px;font-weight:700;cursor:pointer}.btn:hover{text-decoration:none;opacity:.92}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:42px 0 64px}.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:25px;box-shadow:0 2px 10px rgba(20,32,51,.04);transition:transform .12s ease,box-shadow .12s ease}.card:hover{transform:translateY(-2px);box-shadow:0 7px 22px rgba(20,32,51,.08);text-decoration:none}.card p{margin:0 0 14px}.card span{font-weight:700}.tag{display:inline-block;font-size:12px;font-weight:800;background:var(--soft);color:var(--blue);padding:3px 8px;border-radius:999px;margin-bottom:10px}
.section{padding:10px 0 30px}.split{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:start}.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 2px 10px rgba(20,32,51,.04)}.checklist{padding-left:20px;color:var(--muted)}.checklist li{margin:8px 0}
.tool-head{padding-top:42px}.tool-head h1{margin-bottom:10px}.calc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;margin:32px 0 44px;box-shadow:0 2px 10px rgba(20,32,51,.04)}.formgrid{display:grid;grid-template-columns:1fr 1fr;gap:18px 16px}.field label{display:block;font-weight:700;font-size:14px;margin-bottom:7px}.field input,.field select{width:100%;padding:13px;border:1px solid #cbd5e1;border-radius:9px;font-size:16px;background:#fff}.field small{display:block;color:#718096;margin-top:5px}.actions{margin-top:20px}.result{margin-top:20px;background:var(--soft);border:1px solid #c9dcff;border-radius:13px;padding:18px;font-size:16px}.result strong{font-size:22px}.content{padding-bottom:58px}.content ul{color:var(--muted)}.content li{margin:7px 0}.note{background:#fff;border-left:4px solid var(--blue);padding:15px 18px;margin:22px 0;border-radius:0 10px 10px 0}.warning{border-left-color:#b7791f;background:#fffaf0}.faq{border-top:1px solid var(--line);padding:18px 0}.faq h3{font-size:18px}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0 40px}.related a{background:#fff;border:1px solid var(--line);padding:15px;border-radius:12px;font-weight:700}.table{width:100%;border-collapse:collapse;margin:20px 0}.table th,.table td{border:1px solid var(--line);padding:10px;text-align:left}.table th{background:#f1f5f9}.breadcrumb{font-size:14px;color:#718096;margin-top:22px}.muted{color:#718096}.small{font-size:14px}
footer{background:#fff;border-top:1px solid var(--line);padding:30px 0}.foot{display:flex;justify-content:space-between;gap:20px;color:#718096;font-size:14px}.footer-links{display:flex;gap:16px;flex-wrap:wrap}.site-note{margin-top:8px;font-size:13px;color:#718096}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}.split{grid-template-columns:1fr}}@media(max-width:650px){h1{font-size:38px}.grid,.related{grid-template-columns:1fr}.formgrid{grid-template-columns:1fr}.nav{min-height:auto;padding:16px 24px;align-items:flex-start}.nav nav{gap:10px 14px}.hero{padding:58px 0 50px}.foot{flex-direction:column}.calc{padding:20px}.wrap{padding-left:18px;padding-right:18px}}