:root{
  --bg: #ffffff;
  --panel: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --brand: #2563eb;
  --link: #2563eb;
  --card: #ffffff;
  --card-border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  background: var(--panel);
  border-bottom: 1px solid var(--card-border);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}

.brand-mark {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: #eff6ff;
  border: 1px solid #dbeafe;
}

.top-nav { display: flex; gap: 16px; }
.nav-link {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 8px;
  transition: color .2s, background .2s;
}
.nav-link:hover { color: var(--text); background: #f3f4f6; }
.nav-link.active { color: var(--text); }

.intro { padding: 40px 0 10px; }
.intro h1 {
  margin: 0 0 8px;
  font-size: clamp(24px, 3vw, 32px);
}
.lead { margin: 0; color: var(--muted); }
.muted { color: var(--muted); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
  padding: 26px 0 60px;
}

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 16px;
  text-decoration: none;
  color: var(--text);
  position: relative;
  transition: transform .15s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: #c7d2fe;
  box-shadow: 0 1px 2px rgba(16,24,40,0.06), 0 4px 12px rgba(16,24,40,0.06);
}

.card-thumb {
  width: 100%;
  height: 120px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background: #f8fafc;
}

.card-body { padding-top: 12px; }
.card-title {
  margin: 0 0 8px;
  font-size: 16px;
}
.card-desc {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}
.card-cta {
  font-size: 12px;
  color: var(--link);
}

.site-footer {
  border-top: 1px solid var(--card-border);
  background: var(--panel);
}
.site-footer .container { padding: 18px 0 40px; }
.site-footer p { margin: 0; color: var(--muted); }

@media (hover: none) {
  .card:hover { transform: none; box-shadow: none; }
}