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

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --background-color: #ffffff;
    --background-alt: #f8fafc;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --border-color: #e5e7eb;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Language Toggle */
.language-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    background: var(--background-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 6px var(--shadow-light);
    overflow: hidden;
}

.lang-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
}

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

.lang-btn:hover:not(.active) {
    background: var(--background-alt);
    color: var(--text-primary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.nav-logo i {
    font-size: var(--font-size-2xl);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: color var(--transition-normal);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

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

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: slideInLeft 1s ease-out;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    opacity: 0.9;
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

.hero-badges {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    backdrop-filter: blur(10px);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: transparent;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Molecule Animation */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: slideInRight 1s ease-out;
}

.molecule-animation {
    position: relative;
    width: 300px;
    height: 300px;
    animation: float 6s ease-in-out infinite;
}

.atom {
    position: absolute;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.2));
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.3);
}

.atom-1 {
    top: 50px;
    left: 120px;
    background-color: #ff6b6b;
    animation: pulse 2s ease-in-out infinite;
}

.atom-2 {
    top: 190px;
    left: 45px;
    background-color: #4ecdc4;
    animation: pulse 2s ease-in-out infinite 0.5s;
}

.atom-3 {
    top: 190px;
    left: 195px;
    background-color: #45b7d1;
    animation: pulse 2s ease-in-out infinite 1s;
}

.bond {
    position: absolute;
    background: rgba(255, 255, 255, 0.6);
    transform-origin: left center;
}

.bond-1 {
    top: 80px;
    left: 150px;
    width: 159px;
    height: 4px;
    transform: rotate(62deg);
}

.bond-2 {
    top: 220px;
    left: 75px;
    width: 150px;
    height: 4px;
    transform: rotate(0deg);
}

.bond-3 {
    top: 220px;
    left: -83px;
    width: 159px;
    height: 4px;
    transform: rotate(118deg);
    transform-origin: right center;
}

/* Features Section */
.features {
    padding: var(--spacing-3xl) 0;
    background: var(--background-alt);
}

.section-title {
    text-align: center;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-3xl);
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
    transition: all var(--transition-normal);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px var(--shadow-medium);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: white;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Research Section */
.research {
    padding: var(--spacing-3xl) 0;
    background: white;
}

.research-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.research-text h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.research-text p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.workflow-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl);
    background: var(--background-alt);
    border-radius: var(--border-radius-xl);
}

.workflow-step {
    text-align: center;
    flex: 1;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
    margin: 0 auto var(--spacing-md);
}

.step-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.step-content p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.workflow-arrow {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    font-weight: bold;
}

/* Publications Section */
.publications {
    padding: var(--spacing-3xl) 0;
    background: var(--background-alt);
}

.publication-item {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.pub-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-lg);
}

.pub-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.pub-status {
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
}

.pub-authors {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: var(--spacing-md);
}

.pub-abstract {
    color: var(--text-secondary);
    line-height: 1.6;
}

.citation-section {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.citation-section h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.citation-box {
    position: relative;
    background: var(--background-alt);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
}

.citation-box code {
    display: block;
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    color: var(--text-primary);
}

.copy-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.copy-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.related-work {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.related-work h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.research-list li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.research-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Downloads Section */
.downloads {
    padding: var(--spacing-3xl) 0;
    background: white;
}

.install-section {
    margin-bottom: var(--spacing-3xl);
}

.install-section h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--text-primary);
}

.install-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.install-card {
    background: var(--background-alt);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    text-align: center;
}

.install-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.code-block {
    position: relative;
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-base);
}

.copy-code-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.modes-install {
    margin-bottom: var(--spacing-3xl);
}

.modes-install h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--text-primary);
}

.modes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.mode-install {
    background: var(--background-alt);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.mode-install h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.docs-download {
    margin-bottom: var(--spacing-3xl);
}

.docs-download h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--text-primary);
}

.download-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
    justify-content: center;
    font-weight: 500;
}

.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-medium);
}

.download-btn i {
    font-size: var(--font-size-lg);
}

.requirements h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--text-primary);
}

.req-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.req-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--background-alt);
    border-radius: var(--border-radius-lg);
    justify-content: center;
    font-weight: 500;
}

.req-item i {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
}

/* Animations */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .research-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .workflow-diagram {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .workflow-arrow {
        transform: rotate(90deg);
    }
    
    .pub-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .molecule-animation {
        width: 250px;
        height: 250px;
    }
    
    .atom {
        width: 40px;
        height: 40px;
    }
    
    .install-options,
    .modes-grid,
    .download-links,
    .req-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .language-toggle {
        top: 10px;
        right: 10px;
    }
}

/* Smooth scrolling and additional interactions */
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    width: 100%;
}

/* Loading animations for better UX */
.hero-content > * {
    animation-fill-mode: both;
}

.hero-title {
    animation-delay: 0.2s;
}

.hero-subtitle {
    animation-delay: 0.4s;
}

.hero-badges {
    animation-delay: 0.6s;
}

.hero-buttons {
    animation-delay: 0.8s;
}

/* Guide Section */
.guide {
    padding: var(--spacing-3xl) 0;
    background: var(--background-alt);
}

.guide-section {
    margin-bottom: var(--spacing-3xl);
}

.guide-section h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.guide-content {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.guide-step {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.guide-step:hover {
    background: var(--background-alt);
}

.guide-step:last-child {
    margin-bottom: 0;
}

.guide-step .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: 700;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.guide-step .step-content {
    flex: 1;
}

.guide-step .step-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.guide-step .step-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.installation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.install-option {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
    transition: all var(--transition-normal);
}

.install-option:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-medium);
}

.install-option h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.install-option p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.data-format-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.data-example {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.data-example h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.data-example p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.config-example {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.config-example h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.tutorial-steps {
    display: grid;
    gap: var(--spacing-lg);
}

.tutorial-step {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.tutorial-step h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.tutorial-step p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.cli-commands {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.cli-command {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.cli-command h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.troubleshooting-items {
    display: grid;
    gap: var(--spacing-lg);
}

.trouble-item {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
}

.trouble-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
}

.trouble-item p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Updates Section */
.updates {
    padding: var(--spacing-3xl) 0;
    background: white;
}

.updates-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto var(--spacing-3xl);
}

.updates-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.update-item {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.update-item::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 20px;
    width: 14px;
    height: 14px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--primary-color);
}

.update-date {
    text-align: center;
    min-width: 60px;
    flex-shrink: 0;
}

.date-day {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.date-month {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.update-content {
    flex: 1;
    background: var(--background-alt);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 2px 4px var(--shadow-light);
}

.update-type {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.update-type.version {
    background: var(--primary-color);
    color: white;
}

.update-type.website {
    background: var(--secondary-color);
    color: white;
}

.update-type.application {
    background: var(--accent-color);
    color: white;
}

.update-type.research {
    background: #8b5cf6;
    color: white;
}

.update-type.paper {
    background: #06b6d4;
    color: white;
}

.update-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.update-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.update-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.update-tags .tag {
    background: white;
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    border: 1px solid var(--border-color);
}

.upcoming-updates {
    margin-top: var(--spacing-3xl);
}

.upcoming-updates h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.upcoming-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.upcoming-item {
    background: var(--background-alt);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    text-align: center;
    position: relative;
    transition: all var(--transition-normal);
}

.upcoming-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-medium);
}

.upcoming-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    font-size: var(--font-size-xl);
    color: white;
}

.upcoming-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.upcoming-item p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.upcoming-item .eta {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

/* NatScreen Link */
.natscreen-link {
    margin-top: var(--spacing-lg);
    text-align: center;
}

.natscreen-link .btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.natscreen-link .btn::after {
    content: '→';
    font-weight: bold;
}

/* Enhanced Mobile Responsive Design */
@media (max-width: 768px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: var(--spacing-lg) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: var(--spacing-md) 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .research-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .workflow-diagram {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .workflow-arrow {
        transform: rotate(90deg);
    }
    
    .pub-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .molecule-animation {
        width: 250px;
        height: 250px;
    }
    
    .atom {
        width: 40px;
        height: 40px;
    }
    
    .install-options,
    .modes-grid,
    .download-links,
    .req-grid,
    .installation-grid,
    .data-format-examples,
    .cli-commands,
    .upcoming-grid {
        grid-template-columns: 1fr;
    }
    
    .guide-step {
        flex-direction: column;
        text-align: center;
    }
    
    .updates-timeline::before {
        left: 15px;
    }
    
    .update-item::before {
        left: 9px;
    }
    
    .update-item {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .update-date {
        align-self: flex-start;
        margin-left: var(--spacing-2xl);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .language-toggle {
        top: 10px;
        right: 10px;
    }
    
    .guide-step .step-number {
        width: 30px;
        height: 30px;
        font-size: var(--font-size-base);
    }
    
    .update-content {
        padding: var(--spacing-lg);
    }
    
    .upcoming-item .eta {
        position: static;
        display: inline-block;
        margin-top: var(--spacing-md);
    }
}

/* Improved accessibility for keyboard navigation */
.keyboard-navigation button:focus,
.keyboard-navigation a:focus,
.keyboard-navigation input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .navbar,
    .language-toggle,
    .hero-buttons,
    .copy-code-btn,
    .copy-btn {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .hero {
        background: none;
        color: black;
        min-height: auto;
        padding: 1rem 0;
    }
}

/* Utility classes */
.text-center {
    text-align: center;
}

.hidden {
    display: none;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* Extensible classes for future development */
.content-section {
    padding: var(--spacing-3xl) 0;
}

.content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.grid-auto-fit {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 6px var(--shadow-light);
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-medium);
} 

/* Page Title Styles for individual pages */
.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.page-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* Key Information Section */
.key-info {
    padding: 4rem 0;
    background: var(--light-bg);
}

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

.info-card {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.info-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    margin-bottom: 1.5rem;
    color: white;
    font-size: 2rem;
}

.info-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.info-card p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.info-card .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: inline-block;
}

/* Mobile responsive for key info */
@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 2rem;
    }
    
    .info-card {
        padding: 2rem;
    }
    
    .info-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .info-card h3 {
        font-size: 1.3rem;
    }
}

/* Table Styles */
.guide-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-xl) 0;
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 6px var(--shadow-light);
}

.guide-table thead {
    background: var(--gradient-primary);
    color: white;
}

.guide-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    font-size: var(--font-size-base);
}

.guide-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.guide-table tbody tr:hover {
    background: var(--background-alt);
}

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

@media (max-width: 768px) {
    .guide-table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .guide-table th,
    .guide-table td {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
        white-space: nowrap;
    }
}

/* Highlight List Styles */
.highlight-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-lg) 0;
}

.highlight-list li {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--background-alt);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--border-radius-sm);
}

.highlight-list li::before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    display: inline-block;
    width: 1em;
    margin-right: var(--spacing-sm);
}

/* Subsection Styles */
.guide-subsection {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 2px 4px var(--shadow-light);
}

.guide-subsection h3 {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.guide-subsection h4 {
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

/* Application Scenarios */
.scenario-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.scenario-item {
    background: var(--background-alt);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--secondary-color);
}

.scenario-item h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
}