/* =========================================================
   VOLUME DETAIL
========================================================= */

.volume-content{
    background:#f5f5f5;
    padding:70px 0;
}

.volume-header{
    margin-bottom:50px;
}

.volume-meta{
    display:block;
    font-size:16px;
    color:#666;
    margin-bottom:10px;
}

.volume-header h1{
    font-size:32px;
    font-weight:700;
    line-height:1.1;
    margin-bottom:0;
}

/* SECCIONES */

.toc-section{
    margin-bottom:60px;
}

.toc-section h2{
    font-size:24px;
    font-weight:300;
    color:#222;
    margin-bottom:25px;
    padding-bottom:10px;
    border-bottom:2px solid var(--secondary-color);
}

/* ARTÍCULOS */

.article-item{
    padding:25px 0;
    border-bottom:1px solid #ddd;
}

.article-item:last-child{
    border-bottom:none;
}

.article-item h3{
    font-size:16px;
    font-weight:700;
    line-height:1.4;
    margin-bottom:12px;
}

.authors{
    color:#666;
    font-size:16px;
    margin-bottom:15px;
}

/* BOTONES */

.article-actions{
    display:flex;
    gap:10px;
}

.btn-pdf,
.btn-html{

    display:inline-block;

    padding:8px 18px;

    border-radius:4px;

    font-size:12px;
    font-weight:600;

    text-decoration:none;

    transition:.3s;
}

.btn-pdf{
    background:var(--secondary-color);
    color:#fff;
}

.btn-html{
    background:#222;
    color:#fff;
}

.btn-pdf:hover,
.btn-html:hover{
    color:#fff;
    opacity:.85;
}

/* PORTADA */

.cover-box{
    position:sticky;
    top:120px;
}

.cover-image{
    width:100%;
    border-radius:6px;
    box-shadow:0 10px 30px rgba(0,0,0,.15);
}

/* RESPONSIVE */

@media(max-width:991px){

    .cover-box{
        position:relative;
        top:auto;
        margin-top:40px;
    }

    .volume-header h1{
        font-size:32px;
    }

    .toc-section h2{
        font-size:24px;
    }

    .article-item h3{
        font-size:16px;
    }
}