:root{
  --brand:#2563eb;
  --brand-dark:#1d4ed8;
  --ink:#0f172a;
  --muted:#475569;
  --line:#e2e8f0;
  --bg:#f8fafc;
  --card:#ffffff;
  --good:#16a34a;
  --radius:14px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:960px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:10;
}
.site-header .container{
  display:flex;align-items:center;justify-content:space-between;height:60px;
}
.logo{font-weight:800;font-size:1.25rem;color:var(--ink)}
.logo span{color:var(--brand)}
.logo:hover{text-decoration:none}
.nav a{margin-left:18px;font-weight:600;color:var(--muted)}
.nav a:hover{color:var(--brand);text-decoration:none}

/* Hero */
.hero{padding:56px 0 40px;text-align:center}
.hero h1{font-size:2.3rem;line-height:1.2;margin:0 0 14px;letter-spacing:-.5px}
.hero p{color:var(--muted);font-size:1.12rem;max-width:640px;margin:0 auto}
.hero .tag{display:inline-block;background:#dbeafe;color:var(--brand-dark);font-weight:700;font-size:.8rem;padding:5px 12px;border-radius:999px;margin-bottom:16px}

/* Cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px;padding:10px 0 56px}
.cat-heading{font-size:1.35rem;margin:28px 0 14px;letter-spacing:-.3px}
.cat-heading .icon{margin-right:6px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;display:block;transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(15,23,42,.08);border-color:#c7d2fe;text-decoration:none}
.card h2{font-size:1.08rem;margin:0 0 6px}
.card p{color:var(--muted);font-size:.92rem;margin:0}
.card .icon{font-size:1.5rem}

/* Tool page */
.tool-main{padding:32px 0 48px}
.tool-main h1{font-size:2rem;letter-spacing:-.4px;margin:0 0 10px}
.lead{color:var(--muted);font-size:1.05rem;max-width:680px;margin:0 0 24px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:24px}
.panel h2{font-size:1.05rem;margin:0 0 16px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px}
.field input,.field select{
  width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;
  font-size:1rem;background:#fff;color:var(--ink);
}
.field input:focus,.field select:focus{outline:2px solid var(--brand);outline-offset:1px;border-color:var(--brand)}
.field .hint{font-size:.8rem;color:var(--muted);margin-top:4px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.result{
  background:#f0fdf4;border:1px solid #bbf7d0;border-radius:12px;padding:18px 20px;
  margin-top:8px;
}
.result .big{font-size:1.9rem;font-weight:800;color:var(--good);letter-spacing:-.5px}
.result .label{font-size:.82rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.4px}
.result .row{margin-top:10px}
.result .item{font-size:.92rem}
.result .item b{display:block;font-size:1rem}

.content h2{font-size:1.25rem;margin:28px 0 10px}
.content p,.content li{color:var(--muted)}
.content ul{padding-left:22px}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:10px;background:#fff;padding:14px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:700;color:var(--ink)}
.faq p{color:var(--muted);margin:10px 0 0}

/* Related */
.related{margin:28px 0}
.related .chips{display:flex;flex-wrap:wrap;gap:10px}
.related a{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:.9rem;font-weight:600}
.related a:hover{border-color:var(--brand);text-decoration:none}

footer{border-top:1px solid var(--line);padding:28px 0 40px;color:var(--muted);font-size:.9rem}
footer .container{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between}
.disclaimer{font-size:.8rem;color:#94a3b8;margin-top:8px}

@media(max-width:600px){
  .hero h1{font-size:1.7rem}
  .row{grid-template-columns:1fr}
  .result .big{font-size:1.5rem}
}