header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  padding: 0 28px;

  width: 100%;
  max-width: 100vw;
  overflow: hidden;

  display: flex;
  align-items: center;
  justify-content: space-between;

  background: rgba(3, 8, 16, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 150, 255, 0.18);
}

header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;

  width: 40%;
  max-width: 40vw;
  height: 2px;

  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 145, 255, 0.4),
    rgba(0, 200, 255, 1),
    rgba(0, 145, 255, 0.4),
    transparent
  );

  filter: blur(0.6px);
  animation: sweep 3s ease-in-out infinite;
  pointer-events: none;
}

@keyframes sweep {
  0% {
    transform: translateX(-110%);
    opacity: 0;
  }

  15% {
    opacity: 1;
  }

  85% {
    opacity: 1;
  }

  100% {
    transform: translateX(260%);
    opacity: 0;
  }
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.brand img {
  height: 42px;
  width: auto;
  display: block;
}

.brand span {
  font-size: 1rem;
  color: #f4f8ff;
  text-shadow: 0 0 10px rgba(0, 145, 255, 0.45);
}

nav {
  display: flex;
  gap: 24px;
}

nav a {
  color: #d8e6f7;
  text-decoration: none;
  font-size: 0.95rem;
  transition: 0.2s;
}

nav a:hover {
  color: #00a6ff;
}

.burger {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.9rem;
  cursor: pointer;
}