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

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --transition: all 0.2s ease-in-out;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--gray-600);
}

.section {
    padding: 5rem 0;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h3 {
    color: var(--primary-color);
    margin: 0;
    font-weight: 700;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.nav-links a.nav-cta {
    background: var(--primary-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-links a.nav-cta:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--light-color) 0%, var(--gray-100) 100%);
    padding: 8rem 0 6rem;
    margin-top: 80px;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    margin-bottom: 2rem;
    color: var(--gray-900);
}

.highlight {
    color: var(--primary-color);
    background: linear-gradient(120deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.authors {
    margin-bottom: 3rem;
}

.authors p {
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.author {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.author:hover {
    color: var(--primary-color);
}

.affiliation {
    color: var(--gray-500);
    font-size: 1rem;
}

.equal-contrib {
    color: var(--gray-400);
    font-size: 0.875rem;
}

.correspondence {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.correspondence a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.correspondence a:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
    transform: translateY(-2px);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Abstract Section */
.abstract-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
}

.abstract-content p {
    color: var(--gray-700);
    margin-bottom: 1.5rem;
}

/* Pipeline Section */
.pipeline-section {
    background: var(--gray-50);
    padding: 5rem 0;
}

.pipeline-diagram {
    text-align: center;
    margin-bottom: 4rem;
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.pipeline-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

.diagram-caption {
    margin-top: 1rem;
    font-style: italic;
    color: var(--gray-600);
    font-size: 0.875rem;
}

.pipeline-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

.pipeline-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.pipeline-card.highlight {
    border: 2px solid var(--primary-color);
    transform: scale(1.02);
}

.pipeline-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.pipeline-card.highlight:hover {
    transform: scale(1.02) translateY(-4px);
}

.pipeline-steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 2rem 0;
}

.step {
    background: var(--gray-100);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    flex: 1;
    text-align: center;
    transition: var(--transition);
}

.step.error-prone {
    background: #fef2f2;
    color: var(--error-color);
    border: 1px solid #fecaca;
}

.step.success {
    background: #f0fdf4;
    color: var(--success-color);
    border: 1px solid #bbf7d0;
}

.arrow {
    margin: 0 0.5rem;
    font-size: 1.5rem;
    color: var(--gray-400);
}

.pipeline-note {
    margin-top: 1rem;
    font-weight: 500;
    text-align: center;
}

/* Contributions Section */
.contributions {
    padding: 5rem 0;
}

.contributions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.contribution-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.contribution-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.contribution-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--white);
    font-size: 1.5rem;
}

.contribution-card h3 {
    margin-bottom: 1rem;
    color: var(--gray-800);
}

.contribution-card p {
    color: var(--gray-600);
    margin: 0;
}

/* Visual Examples Section */
.examples-section {
    padding: 5rem 0;
    background: var(--white);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.examples-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.example-card {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    background: var(--gray-50);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.example-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.example-image {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
}

.example-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.example-content {
    padding: 2rem;
}

.example-content h4 {
    margin-bottom: 1.5rem;
    color: var(--gray-800);
    font-size: 1.25rem;
}

.comparison-results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-item {
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--gray-300);
    background: var(--white);
}

.result-item.error {
    border-left-color: var(--error-color);
    background: #fef2f2;
}

.result-item.success {
    border-left-color: var(--success-color);
    background: #f0fdf4;
}

.method-label {
    font-weight: 600;
    color: var(--gray-700);
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.result-text {
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    color: var(--gray-800);
    line-height: 1.5;
}

.failure-cases {
    margin-top: 4rem;
    text-align: center;
}

.failure-cases h3 {
    margin-bottom: 2rem;
    color: var(--gray-800);
}

.failure-diagram {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: inline-block;
    max-width: 100%;
}

.failure-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

/* Results Section */
.results-section {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    margin-bottom: 4rem;
}

.result-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.result-card h3 {
    background: var(--gray-50);
    padding: 1.5rem;
    margin: 0;
    border-bottom: 1px solid var(--gray-200);
}

.result-table {
    padding: 1.5rem;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
}

.highlight-row {
    background: #f0f9ff;
    border-left: 4px solid var(--primary-color);
}

.highlight-row td {
    color: var(--gray-800);
}

.efficiency-showcase {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.efficiency-showcase h3 {
    color: var(--white);
    margin-bottom: 2rem;
}

.efficiency-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.efficiency-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.big-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-desc {
    font-size: 1rem;
    opacity: 0.9;
}

/* Dataset Section */
.dataset-section {
    background: var(--gray-50);
}

.dataset-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.dataset-info h3 {
    color: var(--gray-800);
    margin-bottom: 1.5rem;
}

.dataset-features {
    margin: 2rem 0;
}

.feature {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--gray-700);
}

.feature i {
    color: var(--primary-color);
    width: 1.5rem;
}

.sample-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.sample-image {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.sample-image:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.sample-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
}

.sample-image:hover img {
    transform: scale(1.05);
}

.sample-caption {
    padding: 0.75rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
    margin: 0;
}

/* BibTeX Section */
.bibtex-section {
    background: var(--gray-900);
    color: var(--white);
}

.bibtex-section h2 {
    color: var(--white);
}

.bibtex-container {
    position: relative;
    background: var(--gray-800);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.bibtex-code {
    background: transparent;
    color: var(--gray-200);
    padding: 2rem;
    margin: 0;
    overflow-x: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
}

.copy-btn:hover {
    background: #1d4ed8;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 3rem 0;
}

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

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--white);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .correspondence {
        font-size: 0.8rem;
        line-height: 1.4;
    }
    
    .pipeline-comparison {
        grid-template-columns: 1fr;
    }
    
    .contributions-grid {
        grid-template-columns: 1fr;
    }
    
    .results-section {
        gap: 2rem;
    }
    
    .dataset-content {
        grid-template-columns: 1fr;
    }
    
    .efficiency-stats {
        grid-template-columns: 1fr;
    }
    
    .example-card {
        grid-template-columns: 1fr;
    }
    
    .example-image {
        order: 1;
    }
    
    .example-content {
        order: 2;
        padding: 1.5rem;
    }
    
    .failure-diagram {
        padding: 1rem;
    }
    
    .pipeline-diagram {
        padding: 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

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

.section {
    animation: fadeInUp 0.6s ease-out;
}

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

/* Selection styling */
::selection {
    background: var(--primary-color);
    color: var(--white);
}

/* Focus styles for accessibility */
button:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}