* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: #111;
    color: #fff;
    font-family: Arial, sans-serif;
}

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    background: #181818;
    padding: 20px;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
}

.logo {
    font-size: 24px;
    margin: 0 0 25px;
}

.sidebar nav a {
    display: block;
    color: #ddd;
    text-decoration: none;
    padding: 10px 0;
    border-bottom: 1px solid #333;
}

.sidebar nav a:hover {
    color: #fff;
}

.content {
    margin-left: 220px;
    width: calc(100% - 220px);
    padding: 15px;
}

.thumb-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
}

.thumb {
    display: block;
    background: #222;
    aspect-ratio: 1 / 1;
    overflow: hidden;
}

.thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* スマホ */
@media (max-width: 768px) {
    .layout {
        display: block;
    }

    .sidebar {
        position: static;
        width: 100%;
        padding: 12px;
    }

    .logo {
        font-size: 20px;
        margin-bottom: 10px;
    }

    .sidebar nav {
        display: flex;
        overflow-x: auto;
        gap: 10px;
    }

    .sidebar nav a {
        white-space: nowrap;
        border-bottom: none;
        background: #222;
        padding: 8px 12px;
        border-radius: 4px;
    }

    .content {
        margin-left: 0;
        width: 100%;
        padding: 8px;
    }

    .thumb-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }
}
.pagination {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin: 25px 0;
    flex-wrap: wrap;
}

.pagination a {
    color: #fff;
    background: #222;
    padding: 8px 12px;
    text-decoration: none;
    border-radius: 4px;
}

.pagination a.active,
.pagination a:hover {
    background: #555;
}