/* Simple responsive styling */
:root {
  --bg:#f7f7fb;
  --card:#ffffff;
  --accent:#0f172a;
  --muted:#6b7280;
}
*{box-sizing:border-box}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial;color:var(--accent);margin:0;background:var(--bg)}
.container{max-width:1100px;margin:0 auto;padding:20px}
.site-header{background:transparent;padding:12px 0}
.logo{font-weight:700;text-decoration:none;color:var(--accent);font-size:20px}
.main-nav a{margin-left:16px;text-decoration:none;color:var(--muted)}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:20px}
.tool-card{background:var(--card);padding:16px;border-radius:8px;display:block;text-decoration:none;color:inherit;box-shadow:0 4px 14px rgba(2,6,23,0.06)}
.tool-card h3{margin:0 0 8px 0}
.site-footer{padding:20px 0;text-align:center;color:var(--muted)}
@media(max-width:600px){.main-nav{display:none}}