* {
  box-sizing: border-box;
}

body {
  margin: 0px auto;
  background: rgb(0, 8, 24);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0px auto;
}

.banner img {
  height: 100px;
  width: auto;
  object-fit: contain;
  object-position: center;
  display: block;
  margin: 0px auto;
  background-color: rgb(0, 8, 24);
}

.main-nav {
  background: rgb(0, 20, 40);
  padding: 10px 10px;
  height: 50px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.main-nav a {
  color: rgb(128, 128, 128);
  text-decoration: none;
  font-weight: bold;
  padding: 5px 40px;
  transition: background 0.2s ease;
}

.main-nav a:hover {
  background: rgb(0, 40, 40);
}

.layout {
  display: grid;
  grid-template-columns: minmax(100px, 200px) 1fr minmax(100px, 200px);
  gap: 2px;
  margin-top: 2px;
}

.sidebar-left,
.sidebar-right {
  background: rgb(0, 15, 40);
  color: rgb(128, 128, 128);
  padding: 10px;
  min-height: 800px;
}

.content {
  background: rgb(0, 15, 40);
  color: rgb(128, 128, 128);
  padding: 10px;
  min-height: 800px;
}

.footer {
  background: rgb(0, 20, 40);
  color: rgb(128, 128, 128);
  height: 50px;
  padding: 1px 1px;
  margin-top: 2px;
  display: flex;
  text-align: center;
  align-items: center;
  justify-content: center;
}

/* === Mobile === */
@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar-left,
  .sidebar-right {
    display: none;
  }
}

@media (max-width: 720px) {
  .main-nav {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .main-nav a {
    font-size: 0.9rem;
    padding: 0px 5px;
  }

  .content {
    padding: 5px 5px;
  }
}