span {
    display: block;
}

.card {
    position: relative;
    width: var(--width-card);
    max-width: 100%;
    min-height: var(--min-height-card);
    height: max-content;
    margin: 8% auto 0;
    padding: 48px;
    border-radius: 6px;
    z-index: var(--layer-card);
    box-shadow: 16px 8px 8px rgb(225, 248, 213);
}

.card_shadow {
    box-shadow:
        0 0 5px rgba(214, 233, 202, 0.5),
        /* 内側の緑っぽい光 */
        0 0 10px rgba(214, 233, 202, 0.4),
        /* 中間の緑っぽい光 */
        0 0 15px rgba(0, 255, 0, 0.3),
        /* 外側の明るい緑の光 */
        0 0 20px rgba(0, 255, 0, 0.2),
        /* さらに外側の明るい緑の光 */
        0 0 25px rgba(0, 255, 0, 0.1);
    /* さらにさらに外側の明るい緑の光 */
}

/* リロードボタン */
.card .card_reload_btn {
    --size-reload-btn: 32px;
    position: absolute;
    top: 24px;
    right: 24px;
    max-width: var(--size-reload-btn);
    min-width: var(--size-reload-btn);
    max-height: var(--size-reload-btn);
    min-height: var(--size-reload-btn);
    padding: 0;
    /* background-color: rgb(182, 199, 183); */
    /* background-color: transparent; */
    background: linear-gradient(to bottom, #DAAF08, #FFFFFF);
    background-size: 100% 200%;
    animation: gradientAnimation 6s infinite;
    border-radius: 50%;
    /* border-top: 2px solid var(--color-golden); */
    outline: none;
    box-shadow: 2px 4px 4px var(--color-golden);
    opacity: 0.5;
}

@keyframes gradientAnimation {
    0% {
        background-position: 100% 0;
    }

    50% {
        background-position: 100% 100%;
    }

    100% {
        background-position: 100% 0;
    }
}

/* バージョン */
.card_version {
    position: absolute;
    bottom: 16px;
    right: 16px;
    font-size: 12px;
    color: rgb(216, 212, 212);
}

.card_word {
    padding-bottom: 4px;
}

.card_ruby_sublanguage {
    padding-left: 0.4rem;
    padding-bottom: 6px;
    line-height: 1;
    font-size: var(--font-size-xs);
}

.card_ruby {
    margin-bottom: 4px;
    color: var(--color-body-thiner);
}

.card_sublanguage {
    font-weight: normal;
    color: var(--color-body-thiner);
}

.card_word_title {
    margin-bottom: 8px;
    font-size: var(--font-size-xxxl);
    line-height: 1;
}

.card_explanation {
    padding-left: 0.3rem;
    margin-bottom: 16px;
}

.card_explanation_text {
    font-size: var(--font-size-s);
    text-align: justify;
}

.card_coffee_break {
    /* padding: 0.5rem; */
}

.card_coffee_break .card_coffee_break_label {
    display: flex;
    flex-direction: row;
    width: max-content;
    padding: 4px 16px;
    background-color: rgb(182, 199, 183);
    border-radius: 5px;
}

.card_coffee_break .card_coffee_break_label svg {
    display: block;
    width: 20px;
    margin: auto 0;
    padding-right: 8px;
}

.card_coffee_break .card_coffee_break_label span {
    display: block;
    font-size: 74%;
    color: var(--color-secondary);
}

.card_coffee_break .card_coffee_break_text {
    font-size: 92%;
}

#word_id {
    position: absolute;
    bottom: 16px;
    left: 16px;
}

#word_id span {
    font-size: 10px;
    color: gray;
}

@media screen and (max-width:768px) {
    .card {
        padding: 8%
    }
}