.container {
    max-width: 400px;
    margin-top: 80px;
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 8px #eee;
    text-align: center;
}
h3 { color: #721c24; }
.loading { color: #007bff; }
.success { color: #28a745; }
.fail { color: #dc3545; }
.spinner {
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    vertical-align: middle;
    border: 0.2em solid #007bff;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
}
@keyframes spin {
    100% { transform: rotate(360deg); }
}
#countdown {
    color: #888;
    font-size: 1rem;
    margin-left: 10px;
}