* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
  position: relative;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  position: relative;
  z-index: 1;
}

header {
  text-align: center;
  margin-bottom: 30px;
  padding: 20px;
  background-color: #fff;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

header h1 {
  margin-bottom: 10px;
  color: #1890ff;
}

header h3 {
  color: #666;
  font-weight: normal;
}

main {
  background-color: #fff;
  padding: 30px;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input, select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

#editor-container {
  border: 1px solid #ddd;
  border-radius: 4px;
  margin-bottom: 10px;
}

#toolbar {
  padding: 10px;
  border-bottom: 1px solid #ddd;
  background-color: #f9f9f9;
}

#toolbar button, #toolbar select {
  margin-right: 5px;
  padding: 5px 10px;
  background-color: #fff;
  border: 1px solid #ddd;
  border-radius: 3px;
  cursor: pointer;
}

#toolbar button:hover, #toolbar select:hover {
  background-color: #f0f0f0;
}

#editor {
  min-height: 200px;
  padding: 15px;
  overflow-y: auto;
}

button {
  background-color: #1890ff;
  color: white;
  border: none;
  padding: 12px 20px;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
  width: 100%;
  transition: background-color 0.3s;
}

button[type="submit"] {
  margin-top: 10px;
}

button:hover {
  background-color: #40a9ff;
}

button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

footer {
  display: flex;
  flex-direction: column;
  justify-content: center; /* 垂直居中 */
  align-items: center; /* 水平居中 */
  text-align: center; /* 保证文字自身也居中（对多行文本有用） */
  padding: 20px;
  color: #666;
  background-color: #fff;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  margin-top: 20px;
  min-height: 100px; 
}

footer p {
  margin: 0 auto;
  padding: 5px 0;
  max-width: 90%;
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-top: 20px;
}

.spinner {
  width: 30px;
  height: 30px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #1890ff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 10px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.message {
  padding: 15px;
  margin-top: 20px;
  border-radius: 4px;
  text-align: center;
}

.message.success {
  background-color: rgba(82, 196, 26, 0.1);
  color: #52c41a;
  border: 1px solid #b7eb8f;
}

.message.error {
  background-color: rgba(255, 77, 79, 0.1);
  color: #ff4d4f;
  border: 1px solid #ffa39e;
}

.download-btn {
  display: inline-block;
  margin-top: 10px;
  padding: 8px 16px;
  background-color: #1890ff;
  color: white;
  text-decoration: none;
  border-radius: 4px;
  transition: background-color 0.3s;
}

.download-btn:hover {
  background-color: #40a9ff;
}

#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}