.custom-header {
  background: #0f172a;
  padding: 15px 0;
}

.header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo a {
  color: #fff;
  font-size: 20px;
  font-weight: bold;
  text-decoration: none;
}

.nav-menu {
  list-style: none;
  display: flex;
  gap: 25px;
}

.nav-menu li a {
  color: #fff;
  text-decoration: none;
}

.header-btn {
  background: red;
  color: #fff;
  padding: 10px 18px;
  border-radius: 6px;
  text-decoration: none;
}