/* ===================================
   SpAttnForcing - GitHub Pages Style
   =================================== */

/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #0ea5e9;
    --accent-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --font-sans: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Roboto Mono', 'Fira Code', monospace;
    --max-width: 1200px;
}

/* Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-dark);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

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

/* Hero Section */
.hero {
    padding: 160px 24px 80px;
    text-align: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8eb 100%);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.authors {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.author-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
}

.author {
    font-size: 1.1rem;
}

.author sup {
    color: var(--primary-color);
    font-weight: 600;
}

.affiliations {
    display: flex;
    justify-content: center;
    gap: 24px;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 32px;
}

.affiliations sup {
    color: var(--primary-color);
    font-weight: 600;
}

.links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.2s ease;
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Teaser Section */
.teaser {
    padding: 60px 24px;
    background: var(--bg-primary);
}

.teaser-figures {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 16px;
    max-width: 1100px;
    margin: 0 auto 24px;
    align-items: stretch;
}

@media (max-width: 768px) {
    .teaser-figures {
        grid-template-columns: 1fr;
    }
}

.teaser-figure {
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.teaser-figure img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.teaser-cartoon {
    max-width: 280px;
}

.teaser-cartoon img {
    height: 100%;
    width: auto;
    object-fit: contain;
}

.teaser-overview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.teaser-single-figure {
    text-align: center;
    max-width: 1000px;
    margin: 0 auto 24px;
}

.teaser-single-figure img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.video-container {
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-container video {
    width: 100%;
    display: block;
}

.teaser-caption {
    max-width: 800px;
    margin: 24px auto 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Sections */
.section {
    padding: 80px 24px;
}

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

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.section-title i {
    color: var(--primary-color);
}

.section-description {
    text-align: center;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 48px;
    font-size: 1.1rem;
}

/* Speed Control */
.speed-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 32px;
}

.speed-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.speed-buttons {
    display: flex;
    gap: 8px;
}

.speed-btn {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.speed-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* Abstract */
.abstract-content {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.abstract-content p {
    margin-bottom: 16px;
}

.abstract-content strong {
    color: var(--text-primary);
}

/* Demo Grid */
.demo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

@media (max-width: 768px) {
    .demo-grid {
        grid-template-columns: 1fr;
    }
}

.demo-item {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease;
}

.demo-item:hover {
    transform: translateY(-4px);
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    background: #000;
}

.video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.demo-prompt {
    padding: 16px;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
}

/* Video Comparison Layout */
.video-comparison-row {
    margin-bottom: 48px;
}

.video-prompt {
    background: white;
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.6;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.comparison-pair {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

@media (max-width: 768px) {
    .comparison-pair {
        grid-template-columns: 1fr;
    }
}

.comparison-video {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.comparison-video h4 {
    padding: 12px 16px;
    text-align: center;
    background: var(--bg-secondary);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.comparison-video .video-wrapper {
    padding-top: 56.25%;
}

.comparison-video .video-wrapper video {
    object-fit: contain;
}

/* Comparison */
.comparison-container {
    margin-top: 48px;
}

.comparison-container h3 {
    text-align: center;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

@media (max-width: 768px) {
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

.comparison-item {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.comparison-item h4 {
    padding: 16px;
    text-align: center;
    background: var(--bg-secondary);
    font-size: 1rem;
}

.stats {
    padding: 12px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    background: var(--bg-secondary);
}

/* Feature Cards */
.kernel-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

@media (max-width: 992px) {
    .kernel-features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .kernel-features {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Benchmark Section */
.benchmark-section {
    margin: 48px 0;
}

.benchmark-section h3 {
    text-align: center;
    margin-bottom: 24px;
}

.benchmark-table-container {
    overflow-x: auto;
}

.benchmark-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.benchmark-table th,
.benchmark-table td {
    padding: 16px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.benchmark-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

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

.speedup {
    color: var(--accent-color);
    font-weight: 600;
}

.benchmark-note {
    text-align: center;
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Code Blocks */
.code-block {
    background: #1e293b;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: 24px;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #0f172a;
    color: #94a3b8;
    font-size: 0.85rem;
}

.copy-btn {
    background: transparent;
    border: none;
    color: #94a3b8;
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s ease;
}

.copy-btn:hover {
    color: white;
}

.code-block pre {
    padding: 16px;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: #e2e8f0;
    line-height: 1.6;
}

/* Framework Section */
.framework-diagram {
    text-align: center;
    margin-bottom: 48px;
}

.framework-img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Kernel Diagram */
.kernel-diagram {
    text-align: center;
    margin: 24px 0;
}

.kernel-img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.framework-components {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

@media (max-width: 768px) {
    .framework-components {
        grid-template-columns: 1fr;
    }
}

.component-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.component-card h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.component-card h3 i {
    margin-right: 8px;
}

.component-card ul {
    list-style: none;
    padding-left: 0;
}

.component-card li {
    padding: 4px 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Pipeline Steps */
.method-details h3 {
    text-align: center;
    margin-bottom: 32px;
}

.pipeline-steps {
    display: flex;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .pipeline-steps {
        flex-direction: column;
    }
}

.step {
    flex: 1;
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Checkpoint Table */
.checkpoint-table-container {
    overflow-x: auto;
    margin-bottom: 48px;
}

.checkpoint-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.checkpoint-table th,
.checkpoint-table td {
    padding: 16px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.checkpoint-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 500;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: background 0.2s ease;
}

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

/* Config Grid */
.checkpoint-info {
    margin-bottom: 48px;
}

.checkpoint-info h3 {
    text-align: center;
    margin-bottom: 24px;
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

@media (max-width: 768px) {
    .config-grid {
        grid-template-columns: 1fr;
    }
}

.config-item {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.config-item h4 {
    margin-bottom: 16px;
    color: var(--primary-color);
}

.config-item ul {
    list-style: none;
}

.config-item li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.config-item li:last-child {
    border-bottom: none;
}

/* Code Sections */
.code-sections {
    display: grid;
    gap: 32px;
    margin-bottom: 48px;
}

.code-section-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.code-section-card h3 {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.code-section-card h3 i {
    color: var(--primary-color);
    margin-right: 8px;
}

.training-note {
    margin-top: 16px;
    padding: 16px;
    background: #fef3c7;
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: #92400e;
}

.training-note i {
    margin-right: 8px;
}

/* Repository Structure */
.repo-structure h3 {
    margin-bottom: 24px;
}

/* Results Section */
.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}

.result-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.result-card h3 {
    margin-bottom: 16px;
    text-align: center;
}

.chart-placeholder {
    text-align: center;
}

.chart-placeholder img {
    max-width: 100%;
    border-radius: var(--radius);
}

.comparison-table-container {
    margin-top: 32px;
}

.comparison-table-container h3 {
    text-align: center;
    margin-bottom: 24px;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.results-table th,
.results-table td {
    padding: 16px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.results-table th {
    background: var(--bg-secondary);
    font-weight: 600;
}

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

.results-table tr.highlight {
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.1), rgba(14, 165, 233, 0.1));
}

.results-table tr.highlight td {
    color: var(--primary-color);
}

/* Citation */
.citation-box {
    max-width: 800px;
    margin: 0 auto;
}

/* Coming Soon Box */
.coming-soon-box {
    text-align: center;
    padding: 60px 40px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.coming-soon-box i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.coming-soon-box h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.coming-soon-box p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Evaluation Section */
.evaluation-subsection {
    margin-bottom: 48px;
}

.evaluation-subsection h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.table-description {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 900px;
    margin: 0 auto 24px;
    line-height: 1.6;
}

.table-container {
    overflow-x: auto;
}

.eval-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    font-size: 0.9rem;
}

.eval-table th,
.eval-table td {
    padding: 12px 16px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.eval-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

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

.eval-table tr.section-header {
    background: #f1f5f9;
}

.eval-table tr.section-header td {
    text-align: left;
    padding: 10px 16px;
    font-weight: 600;
    color: var(--text-secondary);
}

.eval-table tr.highlight {
    background: rgba(99, 102, 241, 0.05);
}

.eval-table tr.highlight td {
    color: var(--primary-color);
}

.eval-table tr.highlight.best {
    background: rgba(99, 102, 241, 0.1);
}

.eval-table tr.highlight.best td {
    font-weight: 600;
}

/* Acknowledgements */
.acknowledgement-text {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: #9ca3af;
    padding: 48px 24px;
    text-align: center;
}

.footer p {
    margin-bottom: 8px;
}

.footer a {
    color: #9ca3af;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: white;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .hero {
        padding: 120px 24px 60px;
    }

    .section {
        padding: 60px 16px;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .affiliations {
        flex-direction: column;
        gap: 8px;
    }

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

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content {
    animation: fadeIn 0.8s ease-out;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Print Styles */
@media print {
    .navbar,
    .copy-btn,
    .footer {
        display: none;
    }

    .section {
        padding: 24px 0;
    }
}