body {
    font-family: Arial;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.login-box {
    background: white;
    padding: 30px;
    box-shadow: 0 0 10px #ccc;
    border-radius: 8px;
    text-align: center;
    width: 380px;
}
.login-box img {
    width: 100%;
    border-radius: 6px;
    margin-bottom: 15px;
}
.login-box h2 {
    color: #00758f;
}
.login-btn {
    background-color: #00758f;
    color: white;
    padding: 10px 20px;
    border: none;
    margin-top: 20px;
    cursor: pointer;
    font-size: 16px;
    border-radius: 4px;
    width: 100%;
    position: relative;
}
.login-btn:hover:not(:disabled) {
    background-color: #005f72;
}
.login-btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}
.error-message {
    color: #d32f2f;
    margin-top: 20px;
    padding: 10px;
    background-color: #ffebee;
    border-radius: 4px;
    display: none;
}
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    margin-right: 8px;
    vertical-align: middle;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.2);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    display: none;
}
.loading-content {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}