body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    background: #f8fafc;
    color: #222;
}
header {
    background: #2d3748;
    color: #fff;
    padding: 1em 0;
    text-align: center;
}
nav a {
    color: #fff;
    margin: 0 1em;
    text-decoration: none;
    font-weight: bold;
}
nav a:hover {
    text-decoration: underline;
}
main {
    max-width: 700px;
    margin: 2em auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    padding: 2em;
}
.app-details {
    text-align: center;
}
.app-icon {
    width: 96px;
    height: 96px;
    margin-bottom: 1em;
}
.download-btn {
    display: inline-block;
    padding: 0.7em 2em;
    background: #3182ce;
    color: #fff;
    border-radius: 4px;
    text-decoration: none;
    margin-top: 1em;
    font-size: 1.1em;
    transition: background 0.2s;
}
.download-btn:hover {
    background: #225ea8;
}
.screenshots {
    margin-top: 2em;
}
.screenshot-list {
    display: flex;
    justify-content: center;
    gap: 1em;
    flex-wrap: wrap;
}
.screenshot-list img {
    width: 140px;
    height: 250px;
    object-fit: cover;
    border-radius: 6px;
    box-shadow: 0 1px 6px rgba(0,0,0,0.08);
}
footer {
    text-align: center;
    color: #888;
    padding: 1em 0;
    background: #f1f1f1;
    margin-top: 2em;
}
@media (max-width: 600px) {
    main {
        padding: 1em;
    }
    .screenshot-list img {
        width: 100px;
        height: 180px;
    }
}