/* ===== BLOK ZAPROSZENIE ===== */
.hf-inv {
  background: #003366 url('http://hydroforum.tew.pl/wp-dev/wp-content/uploads/2026/08/dramatic-hydroelectric-dam-at-night-powerful-water-rushing-through-turbines-white-foam-and-mist-dark-stormy-sky-with-dramatic-clouds-high-voltage-power-lines-and-pylons-silhouetted-against-t-1.jpg') center center / cover no-repeat;
  border-radius: 10px;
  padding: 2.5rem 2rem;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hf-inv::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 30, 70, 0.72);
  border-radius: 10px;
  z-index: 0;
}
.hf-inv > * {
  position: relative;
  z-index: 1;
}
.hf-inv-badge {
  display: inline-block;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  color: #a8c8e8;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}
.hf-inv h2 {
  font-size: 24px;
  font-weight: 700;
  color: #ffffff !important;
  margin: 0 0 1rem 0;
  line-height: 1.2;
  text-align: center;
}
.hf-inv p {
  font-size: 15px;
  color: #a8c8e8 !important;
  line-height: 1.75;
  max-width: 620px;
  margin: 0 auto 1.75rem auto;
  text-align: center;
}
.hf-inv-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #ffffff;
  color: #003366;
  font-size: 14px;
  font-weight: 700;
  padding: 10px 22px;
  border-radius: 8px;
  text-decoration: none;
}
.hf-inv-btn:hover {
  background: #eef4f9;
  color: #003366;
}