:root {
  --brand: #0ea5e9;
  --ink: #0f172a;
  --muted: #475569;
  --bg: #f8fafc;
}
body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}
.topbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(1.2) blur(6px);
  background: rgba(255, 255, 255, .8);
  border-bottom: 1px solid #e2e8f0;
}
.topbar-inner {
  display: flex; gap: 12px; align-items: center; justify-content: space-between;
  max-width: 900px; margin: auto; padding: 10px 16px;
}
.brand-link {
  display: flex; gap: 10px; align-items: center;
  text-decoration: none; color: inherit;
}
.brand-link img { width: 22px; height: 22px; }
.brand-text { font-weight: 800; font-size: 16px; }
@media (min-width: 981px){ .brand-text { font-size: 22px; } }
.btn {
  appearance: none; border: 1px solid #e2e8f0; border-radius: 999px;
  padding: 10px 14px; font-weight: 600; cursor: pointer; background: #fff;
}
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn:active { transform: translateY(1px); }
@media (max-width: 980px){ .btn { padding: 8px 10px; font-size: 13px; } }
main { max-width: 900px; margin: auto; padding: 1rem; }
ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; }
li {
  background: white; border-radius: 10px; padding: 1rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
li:hover { transform: translateY(-3px); box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
a { text-decoration: none; color: var(--ink); display: block; }
.title { font-size: 1.2rem; font-weight: bold; margin-bottom: 0.3rem; }
.meta { font-size: 0.9rem; color: var(--muted); }
@media (max-width: 600px) { .title { font-size: 1rem; } }