/* --- HEADER AREA --- */
.site-header {
  background: url('path-to-your-background.jpg') no-repeat center center;
  background-size: cover;
  height: 150px; /* sesuaikan tinggi header */
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  position: relative;
  color: #fff;
}

.site-header .logo {
  display: flex;
  align-items: center;
}

.site-header .logo img {
  height: 70px; /* ukuran logo */
  margin-right: 10px;
}

.site-header .issn-info {
  text-align: right;
  font-size: 14px;
  line-height: 1.4;
}

.site-header .publisher {
  position: absolute;
  right: 40px;
  bottom: 15px;
  font-size: 12px;
  color: #eee;
}

/* --- NAVIGATION BAR --- */
.navbar {
  background-color: #113c4a; /* warna hijau kebiruan gelap */
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.navbar ul {
  list-style: none;
  display: flex;
  margin: 0;
  padding: 0;
}

.navbar ul li {
  margin: 0 15px;
}

.navbar ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: color 0.3s ease;
}

.navbar ul li a:hover {
  color: #f5b400; /* efek hover warna kuning */
}