:root{
  --bg: #f6f9fc;
  --card: #ffffff;
  --accent: #ffb703;
  --accent-2: #3a86ff;
  --muted: #6b7280;
  --glass: rgba(255,255,255,0.6);
  --radius: 12px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg,#fbfdff 0%, var(--bg) 100%);
  color:#0f172a;
  margin:0;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.container{max-width:1100px;margin:0 auto;padding:1rem}

/* Header */
.site-header{
  background: linear-gradient(90deg,#fff 0%, rgba(255,255,255,0.6) 100%);
  position:sticky; top:0; z-index:40; box-shadow: 0 6px 18px rgba(12, 24, 48, 0.06);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:0.75rem 0}
.brand{display:flex;gap:0.75rem;align-items:center}
.logo{width:56px;height:56px;background:var(--accent);display:flex;align-items:center;justify-content:center;border-radius:12px;font-size:1.4rem}
.brand h1{margin:0;font-family:Poppins,sans-serif;font-weight:600}
.tag{font-size:0.85rem;color:var(--muted);margin-top:2px}

/* Nav */
.nav a{margin-left:1rem;text-decoration:none;color:var(--muted);font-weight:600}
.nav a.active, .nav a:hover{color:var(--accent-2)}

/* Hero */
.hero{padding:3.25rem 0;text-align:center}
.hero h2{font-size:2rem;margin-bottom:0.25rem}
.lead{color:var(--muted);margin-bottom:1rem}
.cta{display:inline-block;padding:0.6rem 1rem;border-radius:999px;background:var(--accent-2);color:white;font-weight:700;text-decoration:none;box-shadow:0 6px 20px rgba(58,134,255,0.12);transform:translateY(0);transition:transform .18s}
.cta:hover{transform:translateY(-4px)}

/* Topics grid */
.section-title{font-size:1.25rem;margin:0.75rem 0 1.25rem;color:#0b1220}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem}
.card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:0 8px 24px rgba(12,24,48,0.06);display:flex;flex-direction:column;transition:transform .14s, box-shadow .14s}
.card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(12,24,48,0.08)}
.card img{width:100%;height:150px;object-fit:cover}
.card-body{padding:1rem;display:flex;flex-direction:column;gap:0.5rem;flex:1}
.card h4{margin:0;font-size:1rem;color:#06233b}
.card p{margin:0;color:var(--muted);font-size:0.92rem}
.card-actions{margin-top:auto;display:flex;gap:0.5rem;align-items:center}
.btn{background:var(--accent);color:#091420;padding:.5rem .9rem;border-radius:8px;text-decoration:none;font-weight:700}
.btn.outline{background:transparent;border:2px solid var(--accent);color:var(--accent);padding:.45rem .8rem}
.btn:hover{filter:brightness(.96)}

/* Footer */
.site-footer{border-top:1px solid #eef2ff;padding:1rem 0;margin-top:1.25rem;background:transparent}
.footer-inner{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:.95rem}
.socials a{margin-left:.5rem;text-decoration:none;font-size:1.15rem}

/* Responsive */
@media (max-width:720px){
  .header-inner{padding:.6rem 0}
  .hero{padding:2rem 0}
  .card img{height:140px}
  .footer-inner{flex-direction:column;gap:.75rem}
}