.icon-row {
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    margin-left: 15px;
    margin-right: 15px;
    margin-bottom: 2px;
}
.icon-cell {
    flex: 1 1 0;
    max-width: calc((100vw - 10px - 12px) / 4);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    box-sizing: border-box;
    position: relative;
    width: 100%;
    height: auto;
}
.icon-cell:not(:last-child) {
    margin-right: 4px;
}
.icon-img {
    width: 100%;
    height: auto;
    aspect-ratio: 1/1;
    object-fit: contain;
    background: transparent;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.18), 0 1.5px 6px rgba(0,0,0,0.10);
    max-width: 100%;
    max-height: 100vw;
    position: relative;
    z-index: 1;
}
.cover-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
    z-index: 2;
    pointer-events: none;
}
@media (max-width: 600px) {
    .icon-img {
        max-width: 100%;
        max-height: 100vw;
    }
}
body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
    margin: 0;
    padding: 0;
    background: #f7f7f7;
    color: #222;
    width: 100vw;
    height: 100vh;
    box-sizing: border-box;
    overflow-x: hidden;
}
.container {
    width: 100vw;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    background: #ffffff;
    box-shadow: none;
    border-radius: 0;
    display: flex;
    flex-direction: column;
}
header.main-header {
    background: #000000;
    text-align: center;
    padding: 0px;
}
.main-logo {
    display: block;
    margin: 0 auto;
    max-width: 220px;
    height: auto;
}
footer {
    background:#000000;
    color:#e3e3e3;
    text-align:center;
    padding:5px 0;
    font-size:0.9em;
    margin-top:15px;
}
h1 {
    font-size: 1.6em;
    margin-bottom: 16px;
    text-align: center;
}
.info {
    font-size: 1em;
    text-align: center;
    margin-bottom: 5px;
}