:root {
    /* Purple palette - deep, scientific */
    --purple-950: #1a0a2e;
    --purple-900: #2d1b4e;
    --purple-800: #44337a;
    --purple-700: #5b3d8c;
    --purple-600: #7c5daa;
    --purple-500: #9f7aea;
    --purple-400: #b794f4;
    --purple-300: #d6bcfa;
    
    /* Orange palette - warm accents */
    --orange-600: #dd6b20;
    --orange-500: #ed8936;
    --orange-400: #f6ad55;
    --orange-300: #fbd38d;
    
    /* Neutrals */
    --gray-950: #0d0d0f;
    --gray-900: #171719;
    --gray-800: #27272a;
    --gray-700: #3f3f46;
    --gray-600: #52525b;
    --gray-500: #71717a;
    --gray-400: #a1a1aa;
    --gray-300: #d4d4d8;
    --gray-200: #e4e4e7;
    --gray-100: #f4f4f5;
    
    /* Semantic */
    --bg-primary: var(--gray-950);
    --bg-secondary: var(--gray-900);
    --bg-elevated: var(--purple-950);
    --text-primary: var(--gray-100);
    --text-secondary: var(--gray-400);
    --text-muted: var(--gray-500);
    --accent-primary: var(--orange-500);
    --accent-secondary: var(--purple-500);
    
    /* Typography */
    --font-display: 'Outfit', system-ui, sans-serif;
    --font-body: 'Crimson Pro', Georgia, serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 8rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Grain overlay for texture */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-xl);
    background: linear-gradient(to bottom, var(--bg-primary), transparent);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.x-mark {
    color: var(--accent-primary);
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--text-secondary);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color var(--transition-fast);
}

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

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: var(--space-xl);
    background: 
        radial-gradient(ellipse 80% 50% at 50% 0%, var(--purple-900) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 70% 60%, rgba(237, 137, 54, 0.08) 0%, transparent 50%),
        var(--bg-primary);
}

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

.hero-x {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--space-lg);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.chromosome-svg {
    width: 100%;
    height: 100%;
}

.helix-path {
    fill: none;
    stroke: var(--purple-600);
    stroke-width: 2;
    stroke-linecap: round;
    stroke-dasharray: 300;
    stroke-dashoffset: 300;
    animation: drawHelix 2s ease 0.5s forwards;
}

.helix-path.delay {
    stroke: var(--orange-500);
    animation-delay: 0.7s;
}

.helix-dot {
    fill: var(--purple-400);
    opacity: 0;
    animation: fadeIn 0.5s ease forwards;
    animation-delay: 1.5s;
}

.helix-dot:nth-child(odd) {
    fill: var(--orange-400);
}

@keyframes drawHelix {
    to { stroke-dashoffset: 0; }
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 300;
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: var(--space-md);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.4s forwards;
}

.title-x {
    font-weight: 600;
    background: linear-gradient(135deg, var(--orange-500), var(--orange-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-dot {
    color: var(--purple-500);
}

.hero-tagline {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.6s forwards;
}

.scroll-hint {
    position: absolute;
    bottom: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    animation: fadeIn 0.8s ease 1.2s forwards;
}

.scroll-hint span {
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--gray-600), transparent);
    animation: scrollPulse 2s ease infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.2); }
}

/* Sections */
.section {
    padding: var(--space-2xl) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--orange-500);
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: -0.02em;
}

/* About Section */
.about-content {
    max-width: 720px;
}

.about-content .lead {
    font-size: 1.375rem;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

/* Explorations Section */
.explorations-section {
    background: 
        radial-gradient(ellipse 50% 30% at 0% 50%, rgba(123, 93, 170, 0.1) 0%, transparent 50%),
        transparent;
}

.explorations-intro {
    max-width: 600px;
    margin-bottom: var(--space-xl);
    color: var(--text-secondary);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.post-card {
    background: var(--bg-secondary);
    border: 1px solid var(--gray-800);
    border-radius: 8px;
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

.post-card:hover {
    border-color: var(--gray-700);
    transform: translateY(-2px);
}

.post-card.coming-soon {
    opacity: 0.7;
}

.post-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

.post-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--purple-400);
    background: rgba(159, 122, 234, 0.1);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
}

.post-meta time {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.post-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
}

.post-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Tools Section */
.tools-intro {
    max-width: 600px;
    margin-bottom: var(--space-xl);
    color: var(--text-secondary);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--space-lg);
}

.tool-card {
    display: flex;
    gap: var(--space-lg);
    background: linear-gradient(135deg, var(--purple-950), var(--bg-secondary));
    border: 1px solid var(--purple-800);
    border-radius: 12px;
    padding: var(--space-lg);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
}

.tool-card:hover {
    border-color: var(--orange-500);
    transform: translateY(-2px);
    box-shadow: 0 20px 40px -20px rgba(237, 137, 54, 0.2);
}

.tool-card.placeholder {
    opacity: 0.5;
    pointer-events: none;
}

.tool-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--purple-900);
    border-radius: 10px;
    color: var(--orange-500);
}

.tool-icon.muted {
    color: var(--gray-500);
}

.tool-icon svg {
    width: 24px;
    height: 24px;
}

.tool-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.01em;
}

.tool-tagline {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--purple-400);
    margin-bottom: var(--space-md);
}

.tool-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.tool-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--orange-500);
    transition: gap var(--transition-fast);
}

.tool-card:hover .tool-link {
    gap: var(--space-sm);
}

.tool-link svg {
    width: 16px;
    height: 16px;
}

/* Footer */
.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl);
    border-top: 1px solid var(--gray-800);
    margin-top: var(--space-2xl);
}

.footer-brand {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.footer-dot {
    color: var(--purple-500);
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav {
        padding: var(--space-md);
    }
    
    .nav-links {
        gap: var(--space-md);
    }
    
    .section {
        padding: var(--space-xl) var(--space-md);
    }
    
    .hero {
        padding: var(--space-lg);
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-card {
        flex-direction: column;
    }
    
    .footer {
        flex-direction: column;
        gap: var(--space-lg);
        text-align: center;
    }
}

/* Selection */
::selection {
    background: var(--purple-700);
    color: var(--text-primary);
}