/* shadcn-inspired Design System */
:root {
    --background: #ffffff;
    --foreground: #0a0a0a;
    --card: #ffffff;
    --card-foreground: #0a0a0a;
    --popover: #ffffff;
    --popover-foreground: #0a0a0a;
    --primary: #171717;
    --primary-foreground: #fafafa;
    --secondary: #f5f5f5;
    --secondary-foreground: #171717;
    --muted: #f5f5f5;
    --muted-foreground: #737373;
    --accent: #f5f5f5;
    --accent-foreground: #171717;
    --destructive: #ef4444;
    --destructive-foreground: #fafafa;
    --border: #e5e5e5;
    --input: #e5e5e5;
    --ring: #0a0a0a;
    --radius: 0.5rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--foreground);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: transform 0.3s ease;
}

#navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--foreground);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    text-decoration: none;
    color: var(--muted-foreground);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--radius);
    transition: all 0.15s ease;
}

.nav-links a:hover {
    color: var(--foreground);
    background: var(--muted);
}

.nav-icons {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--muted-foreground);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    transition: all 0.15s ease;
    cursor: pointer;
}

.icon-btn:hover {
    color: var(--foreground);
    background: var(--muted);
    border-color: var(--ring);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: var(--radius);
    transition: all 0.15s ease;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    color: var(--secondary-foreground);
    background: var(--secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--accent);
}

.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Hero Section */
.hero-section {
    margin-top: 57px;
    padding: 80px 0;
    text-align: center;
    background: var(--secondary);
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('images_and_pdfs/hero.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.13;
    z-index: 0;
}

.hero-container {
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 500;
    color: var(--muted-foreground);
    background: var(--background);
    border: 1px solid var(--border);
    padding: 4px 12px;
    border-radius: 9999px;
    margin-bottom: 24px;
}

.hero-section h1 {
    font-size: 64px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--foreground);
    letter-spacing: -2px;
}

.subtitle {
    font-size: 20px;
    color: var(--muted-foreground);
    margin-bottom: 8px;
    font-weight: 400;
}

.authors {
    font-size: 14px;
    color: var(--muted-foreground);
    margin-bottom: 32px;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.description {
    font-size: 16px;
    line-height: 1.7;
    color: var(--muted-foreground);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Logos Section */
.logos-section {
    padding: 40px 0;
    background: var(--background);
    border-bottom: 1px solid var(--border);
}

.logos-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.logo-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--foreground);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s ease;
    cursor: pointer;
}

.logo-btn:hover {
    background: var(--muted);
    border-color: var(--ring);
    color: var(--foreground);
    transform: translateY(-1px);
}

.logo-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.logo-btn span {
    white-space: nowrap;
}

/* Section Styles */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--secondary);
}

.section h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 48px;
    text-align: center;
    color: var(--foreground);
    letter-spacing: -0.5px;
}

.section h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--foreground);
}

/* Highlights Grid */
.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.highlight-item {
    background: var(--card);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: border-color 0.15s ease;
}

.highlight-item:hover {
    border-color: var(--ring);
}

.highlight-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.highlight-item h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.highlight-item p {
    color: var(--muted-foreground);
    font-size: 14px;
    line-height: 1.5;
}

/* Table Styles */
.table-section {
    margin-bottom: 32px;
}

.table-category {
    font-size: 14px;
    font-weight: 600;
    color: var(--muted-foreground);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    padding-left: 0;
    border-left: none;
}

.table-wrapper {
    overflow-x: auto;
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.comparison-table th {
    background: var(--muted);
    padding: 12px;
    text-align: left;
    font-weight: 500;
    font-size: 12px;
    color: var(--muted-foreground);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.comparison-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    color: var(--foreground);
}

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

.comparison-table tbody tr:hover {
    background: var(--muted);
}

.comparison-table .highlight-row {
    background: var(--secondary);
}

.comparison-table .highlight-row:hover {
    background: var(--accent);
}

.comparison-table .highlight-row td {
    font-weight: 500;
}

.comparison-table .yes {
    color: #16a34a;
    font-weight: 600;
}

.comparison-table .no {
    color: var(--muted-foreground);
}

.comparison-table .na {
    color: var(--muted-foreground);
}

/* Visualization Styles */
.visualization-block {
    margin-bottom: 48px;
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
}

.visualization-block h3 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--foreground);
}

.viz-description {
    text-align: center;
    color: var(--muted-foreground);
    font-size: 13px;
    margin-top: 12px;
}

/* Image Gallery */
.image-gallery {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 56px;
}

.gallery-container {
    width: 100%;
    overflow: hidden;
    position: relative;
}

.gallery-slide {
    display: none;
    text-align: center;
    animation: fadeSlide 0.3s ease-in-out;
}

.gallery-slide.active {
    display: block;
}

@keyframes fadeSlide {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.gallery-image {
    max-width: 100%;
    max-height: 500px;
    height: auto;
    border-radius: var(--radius);
    cursor: zoom-in;
    transition: opacity 0.15s ease;
    border: 1px solid var(--border);
}

.gallery-image:hover {
    opacity: 0.95;
}

.gallery-gif {
    max-height: 450px;
}

.gallery-label {
    margin-top: 12px;
    font-size: 14px;
    color: var(--muted-foreground);
    font-weight: 500;
}

.gallery-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--muted-foreground);
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.gallery-arrow:hover {
    background: var(--muted);
    color: var(--foreground);
    border-color: var(--ring);
}

.gallery-arrow-left {
    left: 0;
}

.gallery-arrow-right {
    right: 0;
}

.gallery-dots {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 16px;
}

.gallery-dot {
    width: 8px;
    height: 8px;
    border-radius: 9999px;
    background: var(--border);
    cursor: pointer;
    transition: all 0.15s ease;
}

.gallery-dot:hover {
    background: var(--muted-foreground);
}

.gallery-dot.active {
    background: var(--foreground);
}

/* Single Image Container */
.single-image-container {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.full-width-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    cursor: zoom-in;
    border: 1px solid var(--border);
    transition: opacity 0.15s ease;
}

.full-width-image:hover {
    opacity: 0.95;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    cursor: zoom-out;
    animation: fadeIn 0.2s ease;
}

.lightbox.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.lightbox-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s ease;
    z-index: 10000;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lightbox-image {
    max-width: 95%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius);
    cursor: default;
}

.lightbox-caption {
    color: rgba(255, 255, 255, 0.8);
    margin-top: 16px;
    font-size: 14px;
    text-align: center;
}

/* Download Section */
.download-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.download-content > p {
    font-size: 16px;
    margin-bottom: 32px;
    color: var(--muted-foreground);
}

.download-info {
    text-align: left;
    background: var(--card);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin: 32px 0;
}

.download-info h3 {
    margin-top: 24px;
    margin-bottom: 12px;
    color: var(--foreground);
    font-size: 16px;
}

.download-info h3:first-child {
    margin-top: 0;
}

.download-info pre {
    background: var(--foreground);
    color: var(--background);
    padding: 16px;
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.5;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
}

.download-info code {
    font-family: inherit;
}

.stats-list {
    list-style: none;
}

.stats-list li {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.stats-list li:last-child {
    border-bottom: none;
}

.stat-label {
    color: var(--muted-foreground);
}

.stat-value {
    color: var(--foreground);
    font-weight: 500;
}

.dataset-notes {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.dataset-notes h4 {
    margin-bottom: 12px;
    color: var(--foreground);
    font-size: 15px;
    font-weight: 600;
}

.notes-list {
    list-style: none;
    padding: 0;
}

.notes-list li {
    padding: 8px 0;
    font-size: 14px;
    line-height: 1.6;
    color: var(--muted-foreground);
}

.notes-list code {
    background: var(--muted);
    color: var(--foreground);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    font-size: 13px;
}

.download-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
footer {
    background: var(--foreground);
    padding: 48px 0;
    text-align: center;
}

.footer-content {
    color: var(--muted);
}

.footer-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--background);
    margin-bottom: 8px;
}

.footer-cite {
    font-size: 13px;
    color: var(--muted-foreground);
    margin-bottom: 4px;
}

.footer-cite a {
    color: var(--muted);
    text-decoration: underline;
}

.footer-cite a:hover {
    color: var(--background);
}

.footer-contact {
    font-size: 13px;
    color: var(--muted-foreground);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        gap: 12px;
    }

    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
        gap: 4px;
    }

    .nav-links a {
        padding: 6px 10px;
        font-size: 13px;
    }

    .nav-icons {
        gap: 6px;
    }

    .icon-btn {
        width: 32px;
        height: 32px;
    }

    .icon-btn svg {
        width: 16px;
        height: 16px;
    }

    .logos-section {
        padding: 32px 0;
    }

    .logos-container {
        gap: 8px;
    }

    .logo-btn {
        padding: 8px 14px;
        font-size: 13px;
    }

    .logo-btn svg {
        width: 16px;
        height: 16px;
    }

    .hero-section {
        padding: 60px 0;
    }

    .hero-section h1 {
        font-size: 40px;
    }

    .subtitle {
        font-size: 16px;
    }

    .section h2 {
        font-size: 24px;
    }

    .highlights-grid {
        grid-template-columns: 1fr;
    }

    .image-gallery {
        padding: 0 44px;
    }

    .gallery-arrow {
        width: 36px;
        height: 36px;
    }

    .gallery-image {
        max-height: 350px;
    }

    .gallery-gif {
        max-height: 300px;
    }

    .comparison-table {
        font-size: 11px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 8px 6px;
    }

    .visualization-block {
        padding: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
}

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

/* Selection Color */
::selection {
    background: var(--foreground);
    color: var(--background);
}

::-moz-selection {
    background: var(--foreground);
    color: var(--background);
}