.article-header {
 background: var(--light-gray);
 padding: 3rem 0;
 margin-bottom: 0.75rem;
 }
 .article-meta {
 display: flex;
 flex-wrap: wrap;
 gap: 1.5rem;
 margin-bottom: 0.75rem;
 font-size: 0.9375rem;
 color: var(--text-medium);
 }
 .article-meta span {
 display: flex;
 align-items: center;
 gap: 0.5rem;
 }
 .article-meta i {
 color: var(--primary-blue);
 }
 .category-tag {
 display: inline-block;
 background: var(--primary-blue);
 color: var(--white);
 padding: 0.4rem 1rem;
 border-radius: 4px;
 font-size: 0.75rem;
 font-weight: 600;
 text-transform: uppercase;
 letter-spacing: 0.5px;
 margin-bottom: 1rem;
 }
 .article-title {
 font-size: 2rem;
 color: var(--primary-navy);
 line-height: 1.3;
 margin-bottom: 0.75rem;
 }
 .article-content {
 max-width: 800px;
 margin: 0 auto;
 }
 .article-content h2 {
 color: var(--primary-navy);
 font-size: 1.5rem;
 margin-top: 2.5rem;
 margin-bottom: 1rem;
 padding-bottom: 0.5rem;
 border-bottom: 2px solid var(--border-gray);
 }
 .article-content h3 {
 color: var(--primary-navy);
 font-size: 1.25rem;
 margin-top: 2rem;
 margin-bottom: 0.75rem;
 }
 .article-content p {
 color: var(--text-medium);
 line-height: 1.8;
 margin-bottom: 1.25rem;
 }
 .abstract-box {
 background: var(--light-gray);
 padding: 1rem;
 border-radius: 8px;
 margin-bottom: 1.25rem;
 border-left: 4px solid var(--primary-blue);
 }
 .abstract-box h3 {
 color: var(--primary-navy);
 font-size: 1.125rem;
 margin-bottom: 1rem;
 margin-top: 0;
 }
 .keywords {
 display: flex;
 flex-wrap: wrap;
 gap: 0.5rem;
 margin-top: 1.5rem;
 padding-top: 1.5rem;
 border-top: 1px solid var(--border-gray);
 }
 .keywords span {
 background: var(--white);
 color: var(--text-medium);
 padding: 0.35rem 0.75rem;
 border-radius: 4px;
 font-size: 0.8125rem;
 border: 1px solid var(--border-gray);
 }
 .equation-box {
 background: var(--white);
 border: 1px solid var(--border-gray);
 border-radius: 8px;
 padding: 1rem;
 margin: 1.5rem 0;
 text-align: center;
 }
 .equation-box .equation {
 font-family: 'Times New Roman', serif;
 font-size: 1.125rem;
 color: var(--primary-navy);
 font-style: italic;
 margin-bottom: 0.5rem;
 }
 .equation-box .label {
 font-size: 0.875rem;
 color: var(--text-light);
 }
 .nomenclature {
 background: var(--light-gray);
 padding: 1rem;
 border-radius: 8px;
 margin-top: 2.5rem;
 }
 .nomenclature h3 {
 margin-top: 0;
 }
 .nomenclature-grid {
 display: grid;
 grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
 gap: 0.75rem;
 }
 .nomenclature-item {
 display: flex;
 gap: 0.75rem;
 font-size: 0.9375rem;
 }
 .nomenclature-item .symbol {
 font-family: 'Times New Roman', serif;
 font-style: italic;
 font-weight: 600;
 color: var(--primary-navy);
 min-width: 60px;
 }
 .nomenclature-item .desc {
 color: var(--text-medium);
 }
 .back-to-research {
 display: inline-flex;
 align-items: center;
 gap: 0.5rem;
 color: var(--primary-blue);
 font-weight: 500;
 text-decoration: none;
 margin-bottom: 0.75rem;
 transition: all 0.3s ease;
 }
 .back-to-research:hover {
 color: var(--primary-navy);
 }
 .related-articles {
 margin-top: 4rem;
 padding-top: 3rem;
 border-top: 1px solid var(--border-gray);
 }
 .related-card {
 background: var(--white);
 border: 1px solid var(--border-gray);
 border-radius: 8px;
 padding: 1rem;
 transition: all 0.3s ease;
 }
 .related-card:hover {
 border-color: var(--primary-blue);
 box-shadow: var(--shadow-sm);
 }
 .related-card h4 {
 color: var(--primary-navy);
 font-size: 1rem;
 margin-bottom: 0.5rem;
 }
 .related-card p {
 color: var(--text-medium);
 font-size: 0.875rem;
 line-height: 1.6;
 margin-bottom: 1rem;
 }
 .related-card .read-more {
 color: var(--primary-blue);
 font-weight: 500;
 font-size: 0.875rem;
 text-decoration: none;
 }
 .highlight-box {
 background: var(--primary-light);
 border-left: 4px solid var(--primary-blue);
 padding: 1rem;
 border-radius: 0 8px 8px 0;
 margin: 1.5rem 0;
 }
 .highlight-box p {
 margin: 0;
 color: var(--text-medium);
 }
 
.hero-features a.hero-feature-item { transition: all 0.3s ease; }
.hero-features a.hero-feature-item:hover { transform: translateY(-4px); background: rgba(255,255,255,0.15); }
.hero-features a.hero-feature-item:hover h4 { color: #8a6d1c; }