body {
  background: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e') no-repeat center center fixed;
  background-size: cover;
  font-family: sans-serif;
  direction: rtl;
  color: #fff;
}

#login-container, #game-container {
  background: rgba(0,0,50,0.7);
  padding: 20px;
  max-width: 600px;
  margin: 50px auto;
  border-radius: 8px;
}

input {
  display: block;
  width: 250px; /* کوچکتر شد */
  margin: 10px auto;
  padding: 8px;
  font-size: 14px;
}

#grid {
  display: grid;
  grid-template-columns: repeat(15, 20px);
  grid-template-rows: repeat(30, 20px);
  gap: 1px;
  margin: 20px auto;
}

.cell {
  width: 20px;
  height: 20px;
  background: rgba(255,255,255,0.2);
  border: 1px solid #333;
}

.cell.occupied {
  background: #005599;
}

#ships {
  margin: 10px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.ship {
  background: #005599;
  padding: 5px 10px;
  margin: 5px;
  cursor: grab;
  border-radius: 4px;
}

#online-players {
  background: rgba(0,0,0,0.5);
  padding: 10px;
  margin-bottom: 15px;
}

button {
  padding: 8px 20px;
  cursor: pointer;
  font-size: 14px;
}

@media (max-width: 768px) {
  #grid {
    transform: scale(0.8);
    transform-origin: top left;
  }
}