/* 基本样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: Arial, sans-serif; line-height: 1.6; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.btn { display: inline-block; padding: 10px 20px; background: #007bff; color: white; text-decoration: none; border-radius: 5px; }
.card { background: white; border-radius: 10px; padding: 20px; margin-bottom: 20px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; }
.form-group input { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 5px; }
.alert { padding: 15px; border-radius: 5px; margin-bottom: 20px; }
.alert-error { background: #f8d7da; color: #721c24; }
.alert-success { background: #d4edda; color: #155724; }