body {
    font-family: Arial, sans-serif;
    height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #f4f4f4;
}

.center-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

button {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    border: none;
    border-radius: 6px;
    background-color: #1976d2;
    color: white;
    margin-top: 16px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #1565c0;
}

#uploadDkvPricesButton {
    background-color: #f08908;
}

#uploadShellPricesButton {
    background-color: #db2f23;
}

#uploadEwPricesButton {
    background-color: #01014b;
}

#uploadIdsPricesButton {
    background-color: #ed1b2e;
}

#uploadIdsSpecialPricesButton {
    background-color: rgba(237, 27, 46, 0.42);
}

form {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 20px;
}

input[type="file"] {
    margin-bottom: 12px;
}

.notification {
    position: fixed;
    top: 30px;
    right: 30px;
    background-color: #4caf50;
    color: white;
    padding: 16px 28px;
    font-size: 18px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    z-index: 9999;
}

.notification.show {
    opacity: 1;
}

/* NEW: Bottom-right button group */
.corner-buttons {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
}

/* Full-screen loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.8);
    z-index: 10000;
    display: none;
    justify-content: center;
    align-items: center;
}

/* Spinner style */
.loading-spinner {
    border: 16px solid #f3f3f3;
    border-top: 16px solid #1976d2;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 1s linear infinite;
}

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