body {
  margin: 0;
  padding: 0;
  background: url('background.png') no-repeat center center fixed;
  background-size: cover;
  font-family: 'Orbitron', sans-serif;
  color: white;
}

.sidebar {
  width: 250px;
  background: black;
  height: 100vh;
  padding: 30px 20px;
  position: fixed;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.logo {
  display: block;
  max-width: 280px;
  height: auto;
  margin-bottom: 20px;
}

.menu-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

.menu-list a {
  color: white;
  font-size: 1.5em;
  font-weight: bold;
  text-decoration: none;
  animation: glowPulse 2s infinite alternate;
}

.menu-list a:hover {
  text-shadow: 0 0 20px #00ffff, 0 0 40px #00ffff;
}

.menu-list.horizontal {
  flex-direction: row;
  justify-content: center;
  flex-wrap: wrap;
  gap: 40px;
}

.content {
  margin-left: 250px;
  padding: 40px;
}

.gallery-title {
  text-align: center;
  font-size: 2em;
  margin-bottom: 20px;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  justify-items: center;
}

.thumbnail {
  width: 100%;
  max-width: 180px;
  border: 2px solid white;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
}

.thumbnail:hover {
  transform: scale(1.05);
  box-shadow: 0 0 10px #00ffff;
}

.center-box {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.card {
  background: black;
  padding: 40px 60px;
  border-radius: 20px;
  box-shadow: 0 0 20px #00ffff, 0 0 40px rgba(0, 255, 255, 0.2);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: pulseGlow 3s ease-in-out infinite alternate;
}

.index-logo {
  max-width: 480px;
  height: auto;
  margin-bottom: 20px;
  display: block;
}

.divider {
  width: 100%;
  height: 4px;
  background-color: white;
  margin: 20px 0;
}

@keyframes glowPulse {
  from {
    text-shadow: 0 0 5px #00ffff;
  }
  to {
    text-shadow: 0 0 20px #00ffff, 0 0 30px #00ffff;
  }
}