/* Clean Academic Paper Styling */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
    font-size: 16px;
}

/* Header - Simple and Clean */
.header {
    background: #ffffff;
    padding: 1rem 0;
    border-bottom: 1px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #666;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #333;
}

/* Main Content */
.main {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background: #ffffff;
}

/* Title Section */
.title-section {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #eee;
}

.main-title {
    font-size: 1.8rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 2rem;
    line-height: 1.4;
}

.author-info {
    margin-top: 1.5rem;
}

.author-info p {
    margin: 0.3rem 0;
    font-size: 1rem;
    color: #666;
}

.author-info p:first-child {
    font-weight: bold;
    font-size: 1.1rem;
    color: #333;
}

.date {
    color: #888;
    font-size: 0.9rem;
    margin-top: 1rem;
}

/* Abstract */
.abstract {
    background: #f9f9f9;
    border: 1px solid #e0e0e0;
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 4px;
}

.abstract h2 {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 1rem;
}

.abstract p {
    text-align: justify;
    margin-bottom: 1rem;
    line-height: 1.7;
}

/* Content Sections */
.content-section {
    margin: 2.5rem 0;
}

.content-section h2 {
    font-size: 1.4rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.5rem;
}

.content-section h3 {
    font-size: 1.2rem;
    font-weight: bold;
    color: #444;
    margin: 1.5rem 0 1rem 0;
}

.content-section h4 {
    font-size: 1.1rem;
    font-weight: bold;
    color: #555;
    margin: 1.2rem 0 0.8rem 0;
}

.content-section h5 {
    font-size: 1rem;
    font-weight: bold;
    color: #666;
    margin: 1rem 0 0.5rem 0;
}

.content-section p {
    margin-bottom: 1rem;
    text-align: justify;
    line-height: 1.7;
}

.content-section ul, .content-section ol {
    margin: 1rem 0 1rem 1.5rem;
    line-height: 1.6;
}

.content-section li {
    margin-bottom: 0.5rem;
}

/* Tables */
.comparison-table, .results-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    background: #fff;
    border: 1px solid #ddd;
}

.comparison-table th, .comparison-table td,
.results-table th, .results-table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

.comparison-table th, .results-table th {
    background: #f5f5f5;
    font-weight: bold;
    color: #333;
}

.comparison-table tr:nth-child(even), .results-table tr:nth-child(even) {
    background: #fafafa;
}

/* Code Blocks */
.code-block {
    margin: 1.5rem 0;
    background: #f8f8f8;
    border: 1px solid #ddd;
    border-radius: 4px;
    overflow: hidden;
}

.code-block h4 {
    background: #eeeeee;
    padding: 0.75rem 1rem;
    margin: 0;
    font-size: 0.95rem;
    color: #555;
    border-bottom: 1px solid #ddd;
}

.code-block pre {
    margin: 0;
    padding: 1rem;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    line-height: 1.4;
    color: #333;
    background: #ffffff;
}

/* Architecture Diagram */
.architecture-diagram {
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.architecture-diagram h4 {
    text-align: center;
    color: #333;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.tech-layers {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.layer {
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1rem;
}

.layer h5 {
    color: #444;
    font-size: 1rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
}

.layer ul {
    margin: 0;
    padding-left: 1.5rem;
}

.layer li {
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

/* Economic Analysis */
.economic-comparison, .economic-results {
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.economic-comparison h4, .economic-results h4 {
    color: #333;
    margin-bottom: 1rem;
    text-align: center;
    font-size: 1.1rem;
}

/* Implementation Phases */
.implementation-phases {
    margin: 2rem 0;
}

.phase {
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin: 1.5rem 0;
    overflow: hidden;
}

.phase h4 {
    background: #f5f5f5;
    padding: 1rem;
    margin: 0;
    color: #333;
    border-bottom: 1px solid #ddd;
    font-size: 1.1rem;
}

.phase-details {
    padding: 1.5rem;
}

.phase-details h5 {
    color: #444;
    margin: 1rem 0 0.5rem 0;
}

.phase-details ul {
    margin: 0.5rem 0 1rem 1.5rem;
}

/* Case Study */
.case-study {
    background: #f9f9f9;
    border-left: 4px solid #666;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 4px 4px 0;
}

.case-study h4 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.case-study p {
    margin-bottom: 1rem;
}

.case-study ul {
    margin: 0.5rem 0 1rem 1.5rem;
}

/* References */
.references {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #ddd;
}

.references h2 {
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 1.5rem;
}

.references ol {
    margin-left: 1.5rem;
    line-height: 1.6;
}

.references li {
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    text-align: justify;
}

/* Paper Footer */
.paper-footer {
    margin-top: 3rem;
    padding: 2rem 0;
    border-top: 1px solid #ddd;
    text-align: center;
    color: #666;
    font-size: 0.85rem;
    line-height: 1.5;
}

.paper-footer p {
    margin: 0.5rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main {
        padding: 1.5rem 1rem;
    }
    
    .main-title {
        font-size: 1.5rem;
    }
    
    .nav {
        padding: 0 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .comparison-table, .results-table {
        font-size: 0.8rem;
    }
    
    .comparison-table th, .comparison-table td,
    .results-table th, .results-table td {
        padding: 8px;
    }
}

@media print {
    .header {
        display: none;
    }
    
    .main {
        max-width: none;
        padding: 0;
        margin: 0;
    }
    
    .content-section {
        page-break-inside: avoid;
    }
}

/* Framework Layers Styling */
.framework-layers {
    margin: 2rem 0;
}

.layer-detail {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    padding: 2rem;
    margin: 1.5rem 0;
    border-radius: 12px;
    border-left: 5px solid #2563eb;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.layer-detail h4 {
    color: #1e40af;
    margin-bottom: 1rem;
    font-weight: 700;
    font-size: 1.2rem;
}

.layer-detail ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.layer-detail li {
    margin: 0.75rem 0;
    line-height: 1.6;
}

/* Enhanced Phase Styling */
.phase {
    background: linear-gradient(135deg, #fefefe 0%, #f8fafc 100%);
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 2rem;
    margin: 1.5rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.phase h4 {
    color: #1e40af;
    font-weight: 700;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 0.5rem;
}

.phase-details p {
    font-weight: 600;
    color: #374151;
    margin-bottom: 1rem;
}

.phase-details ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.phase-details li {
    margin: 0.8rem 0;
    line-height: 1.7;
}

/* Challenges Section Styling */
.challenges-section {
    margin: 2rem 0;
}

.challenge-category {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    border: 1px solid #fecaca;
    border-left: 5px solid #dc2626;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.challenge-category h4 {
    color: #dc2626;
    font-weight: 700;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.challenge-category ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.challenge-category li {
    margin: 1rem 0;
    line-height: 1.6;
}

.challenge-category ul ul {
    background: rgba(255, 255, 255, 0.7);
    border-radius: 4px;
    padding: 0.5rem 1rem;
    margin: 0.5rem 0;
}

.challenge-category ul ul li {
    margin: 0.5rem 0;
    font-size: 0.95rem;
}