* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: white;
    color: black;
    padding: 20px;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
}

.message {
    border: 1px solid black;
    padding: 10px;
    margin-bottom: 20px;
}

form {
    border: 1px solid black;
    padding: 20px;
    margin-bottom: 20px;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    border: 1px solid black;
    font-size: 16px;
    margin-bottom: 10px;
}

button {
    padding: 10px 20px;
    border: 1px solid black;
    background: white;
    color: black;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: black;
    color: white;
}

.grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 10px;
}

@media (max-width: 1400px) {
    .grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

@media (max-width: 1000px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 600px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.grid-item {
    border: 1px solid black;
    cursor: pointer;
}

.grid-item img {
    width: 100%;
    height: auto;
    display: block;
}

.loading {
    text-align: center;
    padding: 40px;
    border: 1px solid black;
}

.viewer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.viewer-content {
    background: white;
    border: 2px solid black;
    padding: 20px;
    max-width: 63vw;
    max-height: 63vh;
    display: flex;
    flex-direction: column;
}

.viewer img {
    max-width: 100%;
    max-height: calc(63vh - 100px);
    object-fit: contain;
    display: block;
    margin-bottom: 10px;
}

.viewer-buttons {
    margin-top: 10px;
}

.viewer-buttons button {
    margin-right: 10px;
}

.load-indicator {
    text-align: center;
    padding: 40px;
    display: none;
}

.load-indicator.visible {
    display: block;
}

.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid black;
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

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