:root{
  --bg:#0f172a;
  --bg-light:#f8fafc;
  --card:#ffffff;
  --accent:#2563eb;
  --accent-dark:#1d4ed8;
  --text:#1e293b;
  --muted:#64748b;
  --border:#e2e8f0;
  --radius:12px;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg-light);
  color:var(--text);
  line-height:1.6;
}
header{
  background:var(--bg);
  color:#fff;
  padding:1rem 1.5rem;
}
.nav-wrap{
  max-width:1100px;
  margin:0 auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:.75rem;
}
.logo{
  font-weight:700;
  font-size:1.25rem;
  color:#fff;
  text-decoration:none;
}
.logo span{color:#60a5fa}
nav a{
  color:#cbd5e1;
  text-decoration:none;
  margin-left:1.1rem;
  font-size:.92rem;
}
nav a:hover{color:#fff}
main{
  max-width:900px;
  margin:0 auto;
  padding:2rem 1.25rem 4rem;
}
.hero{
  text-align:center;
  padding:2.5rem 1rem 1.5rem;
}
.hero h1{font-size:2rem;margin-bottom:.5rem}
.hero p{color:var(--muted);max-width:640px;margin:0 auto}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:1rem;
  margin-top:2rem;
}
.tool-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:1.25rem;
  text-decoration:none;
  color:var(--text);
  transition:transform .12s, box-shadow .12s;
}
.tool-card:hover{
  transform:translateY(-3px);
  box-shadow:0 8px 20px rgba(15,23,42,.08);
  border-color:var(--accent);
}
.tool-card h3{margin:.2rem 0 .35rem;font-size:1.05rem}
.tool-card p{margin:0;color:var(--muted);font-size:.88rem}
.emoji{font-size:1.6rem}
.calc-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:1.5rem;
  margin-bottom:1.5rem;
}
label{
  display:block;
  font-weight:600;
  font-size:.88rem;
  margin:.9rem 0 .3rem;
}
input,select{
  width:100%;
  padding:.65rem .75rem;
  border:1px solid var(--border);
  border-radius:8px;
  font-size:1rem;
  background:#fff;
  color:var(--text);
}
button{
  margin-top:1.25rem;
  background:var(--accent);
  color:#fff;
  border:none;
  padding:.75rem 1.5rem;
  border-radius:8px;
  font-size:1rem;
  font-weight:600;
  cursor:pointer;
}
button:hover{background:var(--accent-dark)}
.result{
  margin-top:1.25rem;
  padding:1rem;
  background:#eff6ff;
  border:1px solid #bfdbfe;
  border-radius:8px;
  font-size:1.05rem;
  font-weight:600;
  display:none;
}
.result.show{display:block}
.result .big{font-size:1.6rem;color:var(--accent-dark)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.content h2{margin-top:2.5rem;font-size:1.3rem}
.content p{color:var(--text)}
.faq details{
  border:1px solid var(--border);
  border-radius:8px;
  padding:.75rem 1rem;
  margin-bottom:.6rem;
  background:#fff;
}
.faq summary{font-weight:600;cursor:pointer}
.ad-slot{
  background:#f1f5f9;
  border:1px dashed #cbd5e1;
  border-radius:8px;
  padding:1rem;
  text-align:center;
  color:var(--muted);
  font-size:.8rem;
  margin:1.5rem 0;
}
footer{
  background:var(--bg);
  color:#94a3b8;
  text-align:center;
  padding:2rem 1rem;
  font-size:.85rem;
  margin-top:3rem;
}
footer a{color:#cbd5e1}
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:1rem}
.breadcrumb a{color:var(--accent)}