/* 로딩 화면 */
.loading {
    text-align: center;
    padding: 50px;
}

.spinner {
    border: 4px solid #444;
    border-top: 4px solid #ff6b6b;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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