:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --accent: #22d3ee;
    --accent-dim: rgba(34, 211, 238, 0.15);
    --border: rgba(255, 255, 255, 0.08);
    --gradient-1: linear-gradient(135deg, #22d3ee 0%, #0ea5e9 50%, #6366f1 100%);
    --font-serif: 'Instrument Serif', Georgia, serif;
    --font-mono: 'DM Mono', 'SF Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Grain overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    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");
    opacity: 0.03;
    pointer-events: none;
    z-index: 1000;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    text-decoration: none;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.75rem 1.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-decoration: none;
    font-family: var(--font-mono);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 8rem 3rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.hero-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--accent-dim) 0%, transparent 60%);
    filter: blur(100px);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.hero-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    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-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.1s forwards;
    opacity: 0;
}

.hero h1 em {
    font-style: italic;
    color: var(--accent);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.8;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}

.btn-secondary {
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
}

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

.btn-secondary svg {
    transition: transform 0.3s ease;
}

.btn-secondary:hover svg {
    transform: translateX(4px);
}

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

/* Stats bar */
.stats-bar {
    display: flex;
    gap: 4rem;
    padding: 3rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border);
    animation: fadeInUp 0.8s ease 0.4s forwards;
    opacity: 0;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-value {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-tertiary);
}

/* Problem Section */
.section {
    padding: 8rem 3rem;
    position: relative;
}

.section-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--accent);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-label::after {
    content: '';
    flex: 1;
    max-width: 100px;
    height: 1px;
    background: var(--border);
}

.section h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.02em;
    max-width: 800px;
    margin-bottom: 3rem;
}

.section h2 em {
    font-style: italic;
    color: var(--text-secondary);
}

/* Problem cards */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    margin-top: 4rem;
}

.problem-card {
    background: var(--bg-secondary);
    padding: 2.5rem;
    transition: all 0.4s ease;
}

.problem-card:hover {
    background: var(--bg-tertiary);
}

.problem-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-dim);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.problem-card h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.problem-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* How it works */
.how-section {
    background: var(--bg-secondary);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: 4rem;
}

.process-step {
    position: relative;
}

.step-number {
    font-family: var(--font-serif);
    font-size: 6rem;
    color: var(--bg-tertiary);
    line-height: 1;
    margin-bottom: -1.5rem;
    position: relative;
    z-index: 0;
}

.step-content {
    position: relative;
    z-index: 1;
    padding-left: 1rem;
    border-left: 1px solid var(--accent);
}

.step-content h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.75rem;
}

.step-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Demo visualization */
.demo-container {
    margin-top: 6rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.demo-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.demo-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-tertiary);
}

.demo-dot.active {
    background: var(--accent);
    animation: pulse 2s ease-in-out infinite;
}

.demo-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-tertiary);
    margin-left: 0.5rem;
}

.workflow-visual {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 2rem 0;
    overflow-x: auto;
}

.workflow-node {
    flex-shrink: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 1.5rem 2rem;
    min-width: 200px;
    transition: all 0.3s ease;
}

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

.workflow-node.detected {
    border-color: var(--accent);
    box-shadow: 0 0 30px var(--accent-dim);
}

.node-type {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.node-action {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.workflow-arrow {
    flex-shrink: 0;
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    position: relative;
}

.workflow-arrow::after {
    content: '→';
    position: absolute;
    right: -10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent);
    font-size: 1rem;
}

/* Pricing section */
.pricing-section {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.pricing-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 4rem;
    max-width: 900px;
}

.pricing-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 3rem;
    position: relative;
}

.pricing-card.featured {
    border-color: var(--accent);
}

.pricing-card.featured::before {
    content: 'Cortex';
    position: absolute;
    top: -12px;
    left: 2rem;
    background: var(--accent);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.pricing-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-tertiary);
    margin-bottom: 1rem;
}

.pricing-price {
    font-family: var(--font-serif);
    font-size: 3rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.pricing-price span {
    font-size: 1rem;
    color: var(--text-tertiary);
}

.pricing-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.pricing-features {
    list-style: none;
}

.pricing-features li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.pricing-features li::before {
    content: '✓';
    color: var(--accent);
    font-size: 0.75rem;
}

.pricing-card:not(.featured) .pricing-features li::before {
    content: '—';
    color: var(--text-tertiary);
}

/* CTA Section */
.cta-section {
    padding: 10rem 3rem;
    text-align: center;
    position: relative;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-dim) 0%, transparent 60%);
    filter: blur(80px);
    pointer-events: none;
}

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

.cta-content h2 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.cta-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 3rem;
}

/* Footer */
footer {
    padding: 4rem 3rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .problem-grid,
    .process-steps {
        grid-template-columns: 1fr;
    }

    .pricing-comparison {
        grid-template-columns: 1fr;
    }

    nav {
        padding: 1rem 1.5rem;
    }

    .nav-links {
        display: none;
    }

    .section,
    .hero {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .stats-bar {
        flex-wrap: wrap;
        gap: 2rem;
    }
}