* {
  box-sizing: border-box;
}

body {
  background-color: #F8F5F0;
  font-family: 'Nunito', 'Noto Sans TC', Arial, sans-serif;
  color: #333;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
} 

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  padding: 2rem;
  max-width: 700px;
  margin: auto;
  text-align: center;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

p {
  margin: 0.5rem 0;
}

textarea, input[type="text"], input[type="file"] {
  width: 100%;
  margin-top: 1rem;
  padding: 1rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  resize: vertical;
}

button {
  margin-top: 1.5rem;
  padding: 0.8rem 2rem;
  font-size: 1rem;
  border: none;
  background-color: #ffffff;
  color: #333;
  border: 1px solid #999;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #eaeaea;
}

#loading, #successMessage {
  margin-top: 1.5rem;
  font-size: 1rem;
  color: #777;
}

.hidden {
  display: none;
}

#messages {
  margin-top: 2rem;
  text-align: left;
}

/* 🩵 柔光留言卡片 */
.message-item {
  background-color: rgba(255, 255, 255, 0.8);
  padding: 1rem;
  margin-bottom: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  word-wrap: break-word;
  word-break: break-word;
  backdrop-filter: blur(2px);
}

footer {
  margin-top: 3rem;
  padding: 1rem;
  font-size: 0.8rem;
  color: #aaa;
  text-align: center;
}

#musicControl {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background-color: #ffffffcc;
  padding: 0.5rem 1.2rem;
  font-size: 0.95rem;
  border-radius: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  user-select: none;
  unicode-bidi: plaintext;
  transition: background-color 0.3s, transform 0.2s;
}

#musicControl:hover {
  background-color: #f0f0f0;
  transform: scale(1.05);
}

/* 🩵 誰來我家九宮格柔光 */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 1rem;
}

.grid div {
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 8px;
  padding: 8px;
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  backdrop-filter: blur(2px);
}

.highlight-pink { background-color: #FFC1E3; }
.highlight-green { background-color: #CCE8CC; }
.highlight-yellow { background-color: #FFF8D1; }
.highlight-blue { background-color: #D1E6FF; }

/* 響應式排版 */
@media (max-width: 768px) {
  .container {
    padding: 1.5rem;
  }

  textarea, input[type="text"], input[type="file"] {
    font-size: 0.95rem;
  }

  button {
    font-size: 0.95rem;
    padding: 0.7rem 1.5rem;
  }

  #musicControl {
    font-size: 0.85rem;
    padding: 0.4rem 1rem;
  }
}