/* ================================
   F# Data Science Website
   A dark, sophisticated design
   ================================ */

:root {
    /* Color Palette - Midnight Ocean */
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2234;
    --bg-card: #151d2e;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Accent - Vibrant Cyan/Teal */
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --accent-dark: #0891b2;
    --accent-glow: rgba(6, 182, 212, 0.3);
    
    /* Secondary Accent - Warm Orange */
    --accent-warm: #f97316;
    --accent-warm-light: #fb923c;
    
    /* Code Colors */
    --code-keyword: #c084fc;
    --code-string: #4ade80;
    --code-number: #fbbf24;
    --code-comment: #64748b;
    
    /* Spacing */
    --section-padding: 120px;
    --container-max: 1200px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ================================
   Reset & Base
   ================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.9em;
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--accent-light);
}

/* ================================
   Navigation
   ================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: rgba(10, 14, 23, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 1.2rem;
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1.4rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.btn-github {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-tertiary);
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-fast);
}

.btn-github:hover {
    background: var(--bg-card);
    border-color: var(--accent);
    color: var(--text-primary) !important;
}

/* ================================
   Hero Section
   ================================ */

.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 140px 40px 80px;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 70%, transparent 100%);
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--accent);
    top: -200px;
    right: -100px;
    opacity: 0.15;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-warm);
    bottom: -100px;
    left: -100px;
    opacity: 0.1;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: #a855f7;
    top: 40%;
    left: 30%;
    opacity: 0.08;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 50%, var(--accent-warm) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-light);
    font-family: 'JetBrains Mono', monospace;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: var(--bg-primary);
    font-weight: 600;
    padding: 16px 32px;
    border-radius: 12px;
    transition: all var(--transition-base);
    box-shadow: 0 0 40px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px var(--accent-glow);
}

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

/* ================================
   Code Window
   ================================ */

.code-window {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.05),
        0 20px 50px -10px rgba(0, 0, 0, 0.5);
}

.code-window.large {
    max-width: 100%;
}

.window-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.window-dots {
    display: flex;
    gap: 8px;
}

.window-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-card);
}

.window-dots span:nth-child(1) { background: #ef4444; }
.window-dots span:nth-child(2) { background: #eab308; }
.window-dots span:nth-child(3) { background: #22c55e; }

.window-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.code-content {
    padding: 24px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-content code {
    background: transparent;
    padding: 0;
}

.keyword { color: var(--code-keyword); }
.string { color: var(--code-string); }
.number { color: var(--code-number); }
.comment { color: var(--code-comment); font-style: italic; }

/* ================================
   Section Styles
   ================================ */

.section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-glow), transparent);
    border: 1px solid var(--accent);
    color: var(--accent-light);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ================================
   About / Features
   ================================ */

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 32px;
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px -20px var(--accent-glow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent-glow), transparent);
    border: 1px solid var(--accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-light);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ================================
   Pipeline
   ================================ */

.pipeline-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.pipeline-step {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    min-width: 200px;
    transition: all var(--transition-base);
}

.pipeline-step:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.step-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 12px;
}

.step-content h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.step-detail {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 12px;
}

.step-detail code {
    display: block;
    font-size: 0.75rem;
    margin-bottom: 8px;
    background: transparent;
    padding: 0;
}

.step-output {
    display: block;
    font-size: 0.8rem;
    color: var(--accent-light);
    font-weight: 500;
}

.pipeline-arrow {
    color: var(--accent);
    opacity: 0.5;
}

/* ================================
   Visualizations
   ================================ */

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

.viz-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.viz-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-base);
}

.viz-card:hover {
    border-color: var(--accent);
}

.viz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.viz-header h3 {
    font-size: 1.1rem;
}

.viz-type {
    font-size: 0.75rem;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 4px 12px;
    border-radius: 100px;
    font-weight: 600;
}

.viz-frame {
    width: 100%;
    height: 350px;
    background: #fff;
}

.viz-frame iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.viz-description {
    padding: 20px 24px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ================================
   Code Section
   ================================ */

.code-section {
    background: var(--bg-primary);
}

.code-examples {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.code-example {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 32px;
    align-items: start;
}

.code-annotation {
    padding: 24px;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.code-annotation h4 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--accent-light);
}

.code-annotation p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ================================
   Tech Stack
   ================================ */

.tech-stack {
    background: var(--bg-secondary);
}

.tech-grid {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    min-width: 180px;
    transition: all var(--transition-base);
}

.tech-item:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.tech-logo {
    font-size: 2.5rem;
    margin-bottom: 16px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tech-name {
    font-weight: 600;
    margin-bottom: 4px;
}

.tech-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ================================
   Footer
   ================================ */

.footer {
    padding: 80px 0 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    text-align: center;
    margin-bottom: 40px;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-brand .brand-icon {
    width: 40px;
    height: 40px;
}

.footer-content > p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 32px;
}

.footer-links a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ================================
   Mobile Menu
   ================================ */

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ================================
   Responsive
   ================================ */

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: 120px;
    }
    
    .hero-description {
        margin: 0 auto 40px;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .viz-grid {
        grid-template-columns: 1fr;
    }
    
    .code-example {
        grid-template-columns: 1fr;
    }
    
    .pipeline-arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }
    
    .navbar {
        padding: 16px 20px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        padding: 60px 40px;
        transition: right var(--transition-base);
        border-left: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links li {
        width: 100%;
        text-align: center;
    }
    
    .nav-links a {
        display: block;
        padding: 16px;
        font-size: 1.1rem;
    }
    
    .btn-github {
        width: 100%;
        justify-content: center;
    }
    
    .hero {
        padding: 100px 20px 60px;
        min-height: auto;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .stat {
        min-width: 80px;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .btn-primary {
        width: 100%;
        justify-content: center;
        padding: 14px 24px;
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .feature-card {
        padding: 24px;
    }
    
    .pipeline-flow {
        flex-direction: column;
        gap: 16px;
    }
    
    .pipeline-step {
        width: 100%;
        padding: 24px;
    }
    
    .pipeline-arrow {
        transform: rotate(90deg);
    }
    
    .viz-frame {
        height: 280px;
    }
    
    .code-window.large {
        overflow-x: auto;
    }
    
    .code-content {
        font-size: 0.75rem;
        padding: 16px;
    }
    
    .code-annotation {
        padding: 20px;
    }
    
    .tech-grid {
        gap: 12px;
    }
    
    .tech-item {
        min-width: 140px;
        padding: 20px;
    }
    
    .tech-logo {
        font-size: 2rem;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 48px;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .hero {
        padding: 80px 16px 40px;
    }
    
    .hero h1 {
        font-size: 1.75rem;
    }
    
    .hero-badge {
        font-size: 0.75rem;
        padding: 6px 12px;
    }
    
    .hero-stats {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .stat {
        text-align: center;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .section-tag {
        font-size: 0.7rem;
        padding: 4px 12px;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .section-header p {
        font-size: 0.95rem;
    }
    
    .viz-header h3 {
        font-size: 0.95rem;
    }
    
    .viz-frame {
        height: 240px;
    }
    
    .viz-description {
        font-size: 0.85rem;
        padding: 16px;
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tech-item {
        min-width: auto;
        padding: 16px;
    }
    
    .tech-name {
        font-size: 0.85rem;
    }
    
    .tech-desc {
        font-size: 0.75rem;
    }
}

/* ================================
   Animations
   ================================ */

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

.hero-content > * {
    animation: fadeInUp 0.8s ease backwards;
}

.hero-badge { animation-delay: 0.1s; }
.hero h1 { animation-delay: 0.2s; }
.hero-description { animation-delay: 0.3s; }
.hero-stats { animation-delay: 0.4s; }
.btn-primary { animation-delay: 0.5s; }

.hero-visual {
    animation: fadeInUp 1s ease 0.6s backwards;
}