/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6d778e;  /* Slate Gray */
    --primary-dark: #5a6378;   /* Darker Slate Gray */
    --accent-color: #aac6c6;   /* Opal */
    --accent-light: #d6c1b3;   /* Clam Shell */
    --text-primary: #070707;   /* Cod Gray */
    --text-secondary: #4a4a4a;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --success-green: #10b981;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --max-width: 1200px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-white);
}

/* Header Styles */
.site-header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 2rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
    justify-content: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.primary {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.nav-link.primary:hover {
    background-color: var(--primary-dark);
}

/* Main Container */
.main-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 4rem 0;
    border-bottom: 1px solid var(--border-color);
}

.paper-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.authors {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.author::after {
    content: ',';
    margin-right: 0.25rem;
}

.author:last-child::after {
    content: '';
}

.affiliations {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    line-height: 1.5;
}

.affiliation {
    display: inline-block;
}

.venue {
    font-size: 1rem;
    color: var(--accent-color);
    font-weight: 500;
}

/* Abstract Section */
.abstract-section {
    padding: 3rem 0;
    max-width: 800px;
    margin: 0 auto;
}

.abstract-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.abstract-text {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-align: justify;
}

/* Figures Section */
.figures-section {
    padding: 3rem 0;
    background-color: var(--bg-light);
    margin: 0 -2rem;
    padding-left: 2rem;
    padding-right: 2rem;
}

.figures-section h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

.figure-grid {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    margin-top: 2rem;
    align-items: center;
}

.figure-container {
    max-width: 900px;
    width: 100%;
    transition: transform 0.2s ease;
}

.figure-container-small {
    max-width: 450px;
}

.figure-container:hover {
    transform: scale(1.02);
}

.figure-img {
    width: 100%;
    height: auto;
    cursor: pointer;
    display: block;
    max-width: 100%;
    object-fit: contain;
}

.figure-caption {
    padding: 1rem 0;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
    text-align: justify;
    max-width: 900px;
    margin: 0 auto;
}

.figure-caption strong:first-child {
    color: var(--text-primary);
}

.figure-caption strong {
    color: var(--text-primary);
}

/* Findings Section */
.findings-section {
    padding: 3rem 0;
}

.findings-section h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

.findings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.finding-card {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.finding-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.finding-card p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Resources Section */
.resources-section {
    padding: 3rem 0;
    background-color: var(--bg-light);
    margin: 0 -2rem;
    padding-left: 2rem;
    padding-right: 2rem;
    text-align: center;
}

.resources-section h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.resource-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.resource-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.2s ease;
}

.resource-btn:hover {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.resource-icon {
    font-size: 1.2rem;
}

/* Citation Section */
.citation-section {
    padding: 3rem 0;
    max-width: 800px;
    margin: 0 auto;
}

.citation-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.citation-box {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

.citation-box code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* Footer */
.site-footer {
    background-color: var(--bg-light);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    padding-top: 50px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.9);
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 80vh;
    object-fit: contain;
}

#modal-caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
}

.modal-content, #modal-caption {
    animation-name: zoom;
    animation-duration: 0.3s;
}

@keyframes zoom {
    from {transform: scale(0.8)}
    to {transform: scale(1)}
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: #bbb;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
    }
    
    .paper-title {
        font-size: 1.8rem;
    }
    
    .figure-grid {
        grid-template-columns: 1fr;
    }
    
    .findings-grid {
        grid-template-columns: 1fr;
    }
    
    .main-container {
        padding: 1rem;
    }
    
    .figures-section,
    .resources-section {
        margin: 0 -1rem;
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Copy Button Feedback */
.resource-btn.copied {
    background-color: var(--success-green);
    border-color: var(--success-green);
    color: white;
}