:root{
  --bg:#f6fbff;
  --card:#ffffff;
  --text:#0b1b2b;
  --muted:#5b6b7a;
  --blue:#2f7df6;
  --blue2:#75b6ff;
  --border:rgba(20,60,120,.12);
  --shadow: 0 12px 30px rgba(16,60,120,.10);
  --radius:18px;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans Thai", Arial;
  background: radial-gradient(900px 400px at 15% 10%, rgba(117,182,255,.35), transparent 55%),
              radial-gradient(900px 400px at 85% 0%, rgba(47,125,246,.20), transparent 55%),
              var(--bg);
  color:var(--text);
}
a{color:inherit; text-decoration:none}
.container{max-width:980px; margin:24px auto; padding:0 16px}
.topbar{
  position:sticky; top:0;
  backdrop-filter: blur(10px);
  background: rgba(246,251,255,.75);
  border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 16px;
}
.brand{font-weight:800; letter-spacing:.2px}
.top-actions{display:flex; gap:10px}
.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow: var(--shadow);
  padding:18px;
}
.hero{display:flex; flex-direction:column; gap:10px}
h1{margin:0; font-size:28px}
h2{margin:0}
.muted{color:var(--muted)}
.row{display:flex; align-items:center}
.gap{gap:10px}
.btn{
  border:0;
  padding:10px 14px;
  border-radius:14px;
  background: linear-gradient(135deg, var(--blue), var(--blue2));
  color:white;
  font-weight:700;
  cursor:pointer;
  box-shadow: 0 10px 18px rgba(47,125,246,.25);
}
.btn:hover{transform: translateY(-1px)}
.btn.ghost{
  background:transparent;
  color:var(--blue);
  border:1px solid rgba(47,125,246,.35);
  box-shadow:none;
}
.btn.ghost:hover{background:rgba(47,125,246,.08)}
.grid{
  margin-top:18px;
  display:grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap:14px;
}
@media (max-width:820px){ .grid{grid-template-columns: repeat(2,1fr)} }
@media (max-width:520px){ .grid{grid-template-columns: 1fr} }
.hover{transition:.18s ease}
.hover:hover{transform: translateY(-2px); border-color: rgba(47,125,246,.35)}
.cat-title{font-weight:800; font-size:18px}
.cat-sub{margin-top:6px; color:var(--muted)}
.viewer{margin-top:18px}
.imgwrap{
  margin-top:12px;
  border-radius: 16px;
  overflow:hidden;
  border:1px solid var(--border);
  background: linear-gradient(180deg, rgba(47,125,246,.06), transparent);
}
.imgwrap img{
  width:100%;
  max-height:520px;
  object-fit:contain;
  display:block;
}
.meta{margin-top:12px}
.title{font-weight:800}