.subtitle {
	font-style: italic;
    text-align: center;
    opacity: 0.8;
}
		
.image {
  display: block;         /* removes inline-gap */
  max-width: 100%;        /* responsive width */
  height: auto;
  margin: 0 auto;         /* center horizontally */
  border-radius: 8px;     /* rounded corners */
  box-shadow: 0 6px 18px rgba(0,0,0,0.15);
  transition: transform .25s ease, box-shadow .25s ease;
}

.pdf-download {
    display: inline-block;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
	margin-top: 20px;
}

.content-section {
  max-width: 900px;
  margin: 0 auto;
}

.content-title {
  font-size: 2.5rem;
  color: #252525;
}

.toc-list {
  max-width: 900px;
  margin: 20px auto;
}

.toc-item {
    margin-bottom: 16px;
    border-radius: 10px;
    overflow: hidden; /* ensures hover styles stay inside */
}

.toc-link {
    display: block;
    padding: 18px 20px;
    text-decoration: none;
    color: inherit;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: #fff;
    transition: all 0.25s ease;
}

.toc-link:hover {
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
    transform: translateY(-3px);
    background: #fafafa;
	text-decoration: none;
}

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

.toc-author {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1f295c;
  margin-bottom: 6px;
}

.toc-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #444;
  margin: 0;
}

.toc-title-eng {
  font-size: 1.4rem;
  font-style: italic;
  color: #666;
  margin-top: 4px;
}

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

/* Layout */
.article-wrapper {
    max-width: 1300px;
    margin: 0 auto;
}

/* GRID */
.article-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 40px;
}

.doi a {
    color: #0e836f;
    text-decoration: none;
    font-size: 16px;
}

.sidebar {
    border-right: 2px solid #1f295c;
    padding-right: 25px;
}

.side-heading {
    text-transform: uppercase;
    font-size: 14px;
    color: #777;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

/* AUTHORS & CORRESPONDING BOX */
.authors-box,
.corresponding-box {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 25px;
}

.authors-box p,
.corresponding-box p {
    margin: 6px 0;
}

/* Main content */
.article-content strong {
    color: #1f295c;
}

.article-content {
    text-align: justify;
}

/* Responsive */
@media (max-width: 900px) {
    .article-grid {
        grid-template-columns: 1fr;
    }
    .sidebar {
        border-right: none;
        border-bottom: 2px solid #0e836f33;
        padding-bottom: 20px;
        margin-bottom: 20px;
    }
}