body{
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

.souzoku-main {
    font-size: 1.5rem;
    /* 16px × 1.5 = 24px */
    position: relative;
    z-index: 10;
    background: rgba(0, 0, 0, 0.5);
    padding: 50px 20px;
    color: white;
    max-width: 1800px;
    margin: auto;
}


.content-container {
    position: relative;
    z-index: 10;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 50px 20px;
    text-align: center;
}

.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
}

.spacer {
    height: 300px;
    background-color: white;
}

/* スマホ対応 */
@media screen and (max-width: 768px) {
    html {
        font-size: 16px;
    }

    body {
        font-size: 1.2rem;
    }

    .content-container {
        padding: 10px 10px;
        text-align: center;
        justify-content: center;
    }

    .souzoku-main {
        padding: 30px 15px;
    }

    .spacer {
        height: 150px;
    }
}