.koushiki-group {
    margin-top: 2.5rem;
}

.koushiki-group h3 {
    border-left: 5px solid #1f4fbf;
    padding-left: 0.7em;
}

.koushiki-control {
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.koushiki-control button {
    padding: .6rem 1rem;
    cursor: pointer;
}

.koushiki-items {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 900px) {
    .koushiki-items {
        grid-template-columns: 1fr 1fr;
        gap: 1.2rem 1.5rem;
    }
}

.koushiki-item {
    padding: 1rem;
    border: 1px solid #eee;
    border-radius: 10px;
    background: #fff;
}

.koushiki-question {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
    font-size: 1.1rem;
    margin-bottom: 0.7rem;
}

.koushiki-number {
    font-weight: bold;
    margin-right: 0.5em;
}

.koushiki-answer-button {
    flex-shrink: 0;
    padding: 0.45em 1em;
    border: none;
    border-radius: 999px;
    background: #f0f4ff;
    cursor: pointer;
}

.koushiki-answer {
    display: none !important;
    margin-top: 0.8rem;
    padding: 0.8rem 1rem;
    background:#fffae3;
    border-radius: 8px;
}

.koushiki-answer.is-open {
    display: block !important;
}

.koushiki-level {
    font-size: .8rem;
    margin-top: .5rem;
    color: #f0a500;
}

.koushiki-comment {
    margin-top: 1rem;
    font-size: .9rem;
}

@media (max-width: 768px) {
    .koushiki-question {
        display: block;
    }

    .koushiki-answer-button {
        margin-top: .8rem;
    }
}





/*  */

.koushiki-nav{

margin:2rem 0;

padding:1.5rem;

background:#f7f9ff;

border-radius:14px;

}

.koushiki-nav-block{

margin-top:.7rem;

background:#fff;

border-radius:10px;

overflow:hidden;

}

.koushiki-nav summary{

padding:1rem;

cursor:pointer;

font-weight:bold;

}

.koushiki-nav ul{

display:flex;

flex-wrap:wrap;

gap:.5rem;

padding:0 1rem 1rem;

margin:0;

list-style:none;

}

.koushiki-nav a{

display:inline-block;

padding:.45em .8em;

background:#f5f5f5;

border-radius:999px;

text-decoration:none;

}

/*  */
.koushiki-main-summary{

padding:1rem;

font-size:1.05rem;

font-weight:bold;

cursor:pointer;

background:#eaf0ff;

border-radius:10px;

}

.koushiki-main-inner{

margin-top:1rem;

}

/* ランダム */
.koushiki-random-button{

display:inline-block;

padding:.6rem 1rem;

border-radius:999px;

background:#eef5ff;

text-decoration:none;

color:#333;

}


/* 解答を左寄せ */
.koushiki-answer .MathJax,
.koushiki-answer mjx-container,
.koushiki-answer mjx-container[jax="CHTML"]{

text-align:left !important;

justify-content:flex-start !important;

margin:0 !important;

display:flex !important;

}

/* 解答の行間修正 */
.koushiki-answer mjx-container[display="true"]{

display:flex !important;

justify-content:flex-start !important;

margin:.6rem 0 !important;

line-height:2.3 !important;

}

.koushiki-answer mjx-math{

padding:.3rem 0;

}

/* svg */

.koushiki-svg-wrap {
    margin-top: 1rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
}

.koushiki-svg-wrap img {
    width: 180px;
    max-width: 100%;
    height: auto;
    display: block;
}