body {
  font-family: sans-serif;
  padding: 10px;
  margin: 0;
  background-color: #f9f9f9;
}

h2,
h3,
h4 {
  margin-top: 1em;
  margin-bottom: 0.5em;
}

.room-entry {
  border: 1px solid black;
  padding: 8px;
  margin: 6px 0;
  border-radius: 4px;
}

input,
button {
  font-size: 1rem;
  padding: 0.6em;
  margin: 0.3em 0;
  width: 100%;
  box-sizing: border-box;
}

button {
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
}

button:hover {
  background-color: #0056b3;
}

.player-list,
.start-buttons {
  margin-top: 15px;
}

ul {
  padding-left: 1.2em;
}

#lobby {
  display: none;
}

#ai-controls {
  margin-top: 10px;
}

.inline-btn,
.player-level-btn {
  display: inline-block; /* 強制行內 */
  font-size: 0.8em; /* 縮小字體 */
  padding: 2px 6px;
  margin-left: 6px;
  vertical-align: middle;
  cursor: pointer;
  border-radius: 4px;
  width: auto; /* ✅ 覆蓋全域的 100% */
}

.player-level-0,
button.player-level-0:hover {
  background-color: #28a745;
}

.player-level-1,
button.player-level-1:hover {
  background-color: #ffc107;
}

.player-level-2,
button.player-level-2:hover {
  background-color: #ec0b0b;
}

.player-level-3,
button.player-level-3:hover {
  background-color: #5a0bec;
}

select#select-game {
  font-size: 1rem;
  padding: 0.6em;
  margin: 0.3em 0;
  width: 100%;
  box-sizing: border-box;
  border: 1px solid #ccc;
  border-radius: 5px;
  background-color: white;
  appearance: none; /* 去除原生樣式（不同瀏覽器表現不一） */
}

@media (max-width: 768px) {
  input,
  button {
    font-size: 1.2rem;
  }

  ul {
    padding-left: 1em;
  }

  select#select-game {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  button {
    padding: 0.5em;
  }
}