.participation-error-box {
    margin-top: 20px;
    padding: 15px 20px;
    border: 1px solid #f0ad4e;
    background-color: #fff3cd;
    color: #856404;
    font-size: 14px;
    border-radius: 6px;
    display: none;
    position: relative;
}
.participation-error-box::before {
    content: "⚠️ ";
    font-size: 18px;
    margin-right: 5px;
}