body { font-family: Arial, sans-serif; line-height: 1.6; margin: 20px; padding: 0; }
.container {
    max-width: 800px;
    margin: auto;
    padding: 20px;
    /*border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);*/
}
.book-title { 
    color: #333;
    padding-bottom: 10px;
    font-size: 2.2rem;
    margin-bottom: 100px;
    }
.book-title .subtitle {
    font-size: 1.5rem;
}
.book-author {
    font-style: italic;
    color: #888;
    border-bottom: 2px solid #1d2088;
    padding-bottom: 60px;
    font-size: 1.5rem;
    }
.chapter {
  margin-top: 60px;
  margin-bottom: 100px;
}
.container>.chapter:not(:first-child) {
    border-top: 2px solid #1d2088;
    padding-top: 60px;
}

.chapter-title {
    background-color: #6fb3fd;
    color: #fff;
    font-weight: bold;
    padding: 40px 0 120px 20px;
    margin: 0px 0 40px 0;
    font-size: 1.5rem;
    }
.section-body { margin-top: 15px; }
.section-body .chapter-title {
    color: #1d2088;
    background-color: unset;
    padding: 80px 0 20px 0;
    margin: 60px 0 0 0;
    border-top: 2px solid #1d2088;
    font-size: 1.18rem;

}
.section-body .chapter:first-child .chapter-title {
    border-top: unset;
    padding: 20px 0;
    margin: 40px 0 0 0;
}
p { margin-bottom: 10px; }
p.based-on {
    margin: 0;
}
a { color: #007bff; text-decoration: none; }
a:hover { text-decoration: underline; }
.section {margin-bottom: 40px}

.title { color: #555252; font-weight: bold; font-size: 16px}
.section .title { color: #979797;}


/* 참조 링크 스타일 */
.citation { font-size: 0.8em; vertical-align: super; }
.ref-list {
    
}

.ref-list h4 { margin-bottom: 10px; border-bottom: 1px solid #ccc; padding-bottom: 5px; }
.ref-item { margin-bottom: 10px; font-size: 0.9em; }
.ref-item a { word-break: break-all; }
.ref-list a { color: #555; }

.back-matter .ref-list {
    margin-bottom: 60px;
}

.toc {
    /*padding: 40px 0 100px 20px;*/
    padding: 10px 0 10px 20px;
    background-color: #6fb3fd;
}
.toc h2 {
    
    padding-bottom: 10px;
    color: #fff;
    font-weight: bold;
}
.toc ul { list-style-type: none;}

.toc li { margin-bottom: 5px; }
.toc li a { color: #fff; }
.toc li a i {
    font-size: 0.85rem;
    display: block;
}

@media screen and (max-width: 767px) {
    .container { 
        font-size: 1.4rem;
    }
    .toc h2 {
        font-size: 1.6rem;
    }
    .toc ul {
        padding-left: 0;
        padding-right: 10px;
    }
    .toc li {
        margin-bottom: 15px;
        line-height: 1.8rem;
    }
    .toc li a i {
        font-size: 1.12rem;
        line-height: 1.2rem;
    }
}