.site-card {
  position: relative;
  height: 100%;
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.site-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition);
}
.site-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-glow); border-color: var(--color-primary-soft-2); }
.site-card:hover::before { opacity: 1; }
.icon-box {
  width: 48px;
  height: 48px;
  display: inline-grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(150deg, var(--color-primary-soft), var(--color-primary-soft-2));
  color: var(--color-primary);
  font-size: 1.05rem;
  box-shadow: inset 0 0 0 1px rgba(37, 99, 235, .08);
}
.btn-primary-custom, .btn-outline-custom { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 10px 22px; border-radius: 999px; font-weight: 600; text-decoration: none; transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition); }
.btn-primary-custom { color: #fff; background: var(--gradient-primary); border: 1px solid transparent; box-shadow: 0 10px 22px rgba(37, 99, 235, .22); }
.btn-outline-custom { color: var(--color-primary-dark); background: #fff; border: 1px solid var(--color-border); }
.btn-primary-custom:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(37, 99, 235, .3); }
.btn-outline-custom:hover { transform: translateY(-2px); background: var(--color-primary-soft); border-color: var(--color-primary-soft-2); color: var(--color-primary); }
.back-to-top { position: fixed; right: 22px; bottom: 22px; z-index: 1000; width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--gradient-primary); color: #fff; box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(8px); transition: var(--transition); }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { box-shadow: var(--shadow-glow); }