* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "微软雅黑", sans-serif; background: #f0f2f5; padding: 40px 20px; }
.register-box { max-width: 600px; margin: 0 auto; background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 2px 12px rgba(0,0,0,0.1); }
h2 { text-align: center; margin-bottom: 30px; color: #333; }
.role-select { display: flex; gap: 20px; margin-bottom: 25px; justify-content: center; flex-wrap: wrap; }
.role-item { padding: 10px 20px; border: 1px solid #ddd; border-radius: 4px; cursor: pointer; }
.role-item.active { border-color: #409eff; background: #ecf5ff; color: #409eff; }
.form-item { margin-bottom: 18px; }
label { display: block; margin-bottom: 8px; color: #666; }
input, select { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 4px; font-size: 16px; }
@media (max-width: 768px) {
    body { padding: 16px; padding-top: max(16px, env(safe-area-inset-top)); }
    .register-box { padding: 20px 14px; }
    .role-select { gap: 10px; }
    .role-item { flex: 1; text-align: center; min-height: 44px; }
    .form-row { flex-direction: column; }
}
.form-row { display: flex; gap: 15px; flex-wrap: wrap; }
.form-row .form-item { flex: 1; min-width: 140px; }
button { width: 100%; padding: 12px; background: #409eff; color: #fff; border: none; border-radius: 4px; font-size: 16px; cursor: pointer; margin-top: 10px; }
/* 验证码题目按钮是行内元素，不能被上面的 button{width:100%} 撑满整行挤扁输入框 */
#captcha-box { width: auto; flex-shrink: 0; margin-top: 0; }
button:disabled { opacity: .7; }
.back-link { text-align: center; margin-top: 20px; }
.back-link a { color: #409eff; text-decoration: none; }
.hidden { display: none; }
.hint { font-size: 12px; color: #999; margin-top: 4px; }
.notice { background: #ecf5ff; border: 1px solid #b3d8ff; color: #409eff; padding: 10px 12px; border-radius: 4px; font-size: 13px; margin-bottom: 20px; line-height: 1.6; }
.msg { color: #f56c6c; text-align: center; margin-bottom: 12px; min-height: 20px; font-size: 14px; }