header {
    border-bottom: 2px solid #910000;
    background-color: white;
    padding: 15px 0 7px;
    margin: 0 15px;
    position: sticky;
    top: 0;
    width: calc(100% - 30px);
    max-width: 950px;
}

header .title-group {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.header-group {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 100%;
    position: relative;
}

.kuma-icon {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    user-select: none;
}

.kuma-char {
    font-size: 45px;
    font-weight: 500;
    font-family: "Playfair Display", serif;
    line-height: 0.9;
}

.kuma-char::selection {
    color: #b30000;
    background-color: black;
}

.kuma-char .red {
    color: #b30000;
}

.kuma-char .red::selection {
    color: white;
}

.kuma-japanese {
    font-family: "Shippori Mincho", serif;
    font-size: 18px;
    font-weight: 700;
}

.kuma-japanese::selection {
    color: white;
    background-color: black;
}

.kuma-japanese .red::selection {
    color: #b30000;
}

@media (min-aspect-ratio: 1/1) {
    header {
        display: flex;
    }
    header .title-group {
        align-items: flex-start;
        padding-left: 20px;
    }
    .header-group {
        justify-content: flex-start;
    }
    .kuma-japanese {
        padding-left: 10px;
    }
}