body {
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 1em 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header .container {
    width: 80%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header .logo {
    font-family: 'Roboto', sans-serif;
    font-size: 1.5em;
    font-weight: bold;
}

header nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 1em;
}

header nav ul li {
    display: inline;
}

header nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.upload-area {
    margin: 2em auto;
    width: 80%;
    padding: 2em;
    border: 2px dashed #ccc;
    text-align: center;
    background-color: #fff;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: #4CAF50;
}

.card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1em;
    margin: 2em auto;
    width: 80%;
}

.card {
    background-color: #fff;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 1em;
    width: 45%;
    margin-bottom: 2em;
    transition: transform 0.2s;
}

.card:hover {
    transform: scale(1.02);
}

.card h3 {
    margin-top: 0;
    background-color: #f7f7f7;
    padding: 0.5em;
    border-radius: 5px;
    color: #4CAF50;
    font-family: 'Roboto', sans-serif;
}

.card img {
    max-width: 100%;
    border-radius: 10px;
    transition: transform 0.3s ease;
    cursor: pointer;
}

.card img:hover {
    transform: scale(1.05);
}

.card .details {
    margin-top: 1em;
}

.card .details div {
    margin-bottom: 1em;
}

.details .item {
    padding: 0.5em;
    border-radius: 5px;
    background-color: #e7f5fe;
}

.details .item h3 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.details .item h3::after {
    content: '▼';
    transition: transform 0.3s;
}

.details .item h3.collapsed::after {
    transform: rotate(-90deg);
}

.details .item-content {
    display: none;
    padding: 0.5em 0 0.5em 1em;
}

.details .item-content.visible {
    display: block;
}

.metadata-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1em;
}

.metadata-table th, .metadata-table td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

.metadata-table th {
    background-color: #4CAF50;
    color: white;
}

footer {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1em;
    margin-top: auto;
}

.maker-note {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
    cursor: pointer;
    border-bottom: 1px dotted #000;
}

.maker-note:hover::after {
    content: attr(title);
    position: absolute;
    left: 0;
    top: 1.5em;
    white-space: normal;
    background-color: #fff;
    border: 1px solid #ddd;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 1em;
    z-index: 10;
}

@media (max-width: 768px) {
    .card {
        width: 100%;
    }
}

.features {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 80%;
    margin: 2em auto;
}

.feature-card {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 1em;
    width: 100%;
    margin-bottom: 1em;
}

.feature-card h2 {
    font-family: 'Roboto', sans-serif;
    font-size: 1.5em;
    color: #333;
}

.feature-card p {
    font-size: 1em;
    color: #555;
}