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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Oxford Colors */
:root {
    --oxford-blue: #002147;
    --oxford-gold: #C4A484;
    --oxford-light-blue: #4A90A4;
    --text-dark: #333333;
    --text-light: #666666;
    --background-light: #f8f9fa;
    --white: #ffffff;
}

/* Header */
.header {
    background: var(--oxford-blue);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.oxford-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.title-section {
    flex: 1;
}

.main-title {
    font-family: 'Crimson Text', serif;
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.authors {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
    color: var(--oxford-gold);
}

.affiliation {
    font-size: 0.9rem;
    color: #cccccc;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

.nav-link:hover {
    color: var(--oxford-gold);
}

.download-btn {
    background: var(--oxford-gold);
    color: var(--oxford-blue) !important;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.download-btn:hover {
    background: #b8956f;
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--background-light) 0%, #e8f4f8 100%);
    padding: 4rem 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-title {
    font-family: 'Crimson Text', serif;
    font-size: 3rem;
    font-weight: 700;
    color: var(--oxford-blue);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--oxford-blue);
    font-family: 'Crimson Text', serif;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

.hero-image {
    text-align: center;
}

.hero-img {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.hero-img:hover {
    transform: translateY(-10px);
}

/* Section Styles */
.section-title {
    font-family: 'Crimson Text', serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--oxford-blue);
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--oxford-gold);
}

/* Abstract Section */
.abstract {
    padding: 4rem 0;
    background: var(--white);
}

.abstract-content {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.8;
}

.abstract-points {
    margin: 2rem 0;
}

.point {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}

.point-number {
    background: var(--oxford-blue);
    color: var(--white);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.abstract-conclusion {
    font-style: italic;
    color: var(--text-light);
    margin-top: 2rem;
}

/* Sections Grid */
.sections {
    padding: 4rem 0;
    background: var(--background-light);
}

.sections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.section-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border-top: 4px solid var(--oxford-gold);
}

.section-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.card-icon {
    background: var(--oxford-blue);
    color: var(--white);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.section-card h3 {
    font-family: 'Crimson Text', serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--oxford-blue);
    margin-bottom: 1rem;
}

.section-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.section-card ul {
    list-style: none;
}

.section-card li {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.5rem;
}

.section-card li::before {
    content: '•';
    color: var(--oxford-gold);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Insights Section */
.insights {
    padding: 4rem 0;
    background: var(--white);
}

.insights-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.insight-item {
    margin-bottom: 2rem;
}

.insight-item h3 {
    font-family: 'Crimson Text', serif;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--oxford-blue);
    margin-bottom: 0.5rem;
}

.insight-item p {
    color: var(--text-light);
    line-height: 1.7;
}

.insight-img {
    width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

/* Authors Section */
.authors {
    padding: 4rem 0;
    background: var(--background-light);
}

.authors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.author-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.author-card:hover {
    transform: translateY(-5px);
}

.author-card h3 {
    font-family: 'Crimson Text', serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--oxford-blue);
    margin-bottom: 0.5rem;
}

.author-title {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.author-email {
    color: var(--oxford-gold);
    font-weight: 500;
}

.acknowledgments {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.acknowledgments h3 {
    font-family: 'Crimson Text', serif;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--oxford-blue);
    margin-bottom: 1rem;
}

.acknowledgments p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Download Section */
.download {
    padding: 4rem 0;
    background: var(--oxford-blue);
    color: var(--white);
    text-align: center;
}

.download-content h2 {
    font-family: 'Crimson Text', serif;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.download-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #cccccc;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--oxford-gold);
    color: var(--oxford-blue);
}

.btn-primary:hover {
    background: #b8956f;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--oxford-blue);
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: var(--white);
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.footer-right {
    text-align: right;
    font-size: 0.9rem;
    color: #cccccc;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .insights-content {
        grid-template-columns: 1fr;
    }
    
    .sections-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-right {
        text-align: center;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.5rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

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

/* Loading Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-card, .author-card, .insight-item {
    animation: fadeInUp 0.6s ease-out;
}