:root{
  --accent-start:#6a11cb;
  --accent-end:#ff6363;
  --bg:#071021;
  --muted:rgba(255,255,255,0.78);
  --card:rgba(255,255,255,0.03);
  --radius:12px;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Montserrat",sans-serif;background:linear-gradient(160deg,#071021,#0e1222);color:#f1f6fb}
.container{max-width:1100px;margin:0 auto;padding:80px 20px}
.nav{position:fixed;left:0;right:0;top:14px;display:flex;justify-content:center}
.nav-inner{width:92%;max-width:1100px;background:rgba(255,255,255,0.02);padding:10px 16px;border-radius:10px;display:flex;justify-content:space-between;align-items:center}
.brand{color:#fff;text-decoration:none;font-weight:700}
.section{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:20px;border-radius:12px}
.cert-controls{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:12px;flex-wrap:wrap}
.filter-group{display:flex;gap:10px}
.filter-btn{background:transparent;border:1px solid rgba(255,255,255,0.04);padding:8px 12px;border-radius:8px;color:var(--muted);cursor:pointer}
.filter-btn.active{background:linear-gradient(90deg,var(--accent-start),var(--accent-end));color:#081119;border:none}
.cert-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.cert-card{background:var(--card);border-radius:12px;padding:10px;text-align:center;transition:transform 250ms ease,box-shadow 250ms ease;cursor:pointer}
.cert-card img{width:100%;height:160px;object-fit:cover;border-radius:8px}
.cert-card h3{margin:12px 0 6px;font-size:1.05rem}
.cert-card p{margin:0;color:var(--muted);font-size:0.95rem}
.cert-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,0,0,0.6)}
.cert-actions{display:flex;gap:8px;justify-content:center;margin-top:10px}
.open-btn{background:linear-gradient(90deg,var(--accent-start),var(--accent-end));color:#081119;padding:8px 12px;border-radius:8px;border:0;cursor:pointer}
.download{display:inline-block;padding:8px 12px;border-radius:8px;background:transparent;color:var(--muted);text-decoration:none;border:1px solid rgba(255,255,255,0.04)}
.modal{position:fixed;inset:0;background:rgba(2,6,10,0.7);display:none;align-items:center;justify-content:center;z-index:120}
.modal-inner{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:18px;border-radius:12px;width:min(920px,96%);display:grid;grid-template-columns:1fr 320px;gap:12px;align-items:start}
.modal-inner img{width:100%;border-radius:8px}
.modal-meta{padding:8px}
.modal-close{position:absolute;right:22px;top:22px;background:transparent;border:0;color:rgba(255,255,255,0.7);font-size:28px;cursor:pointer}
@media (max-width:820px){.modal-inner{grid-template-columns:1fr;}.nav-inner{padding:8px}}
.fade{opacity:0;transform:translateY(12px);transition:opacity 700ms ease, transform 700ms ease}
.fade.show{opacity:1;transform:none}