:root {
    /* Core Spacing Scale */
    --space-xxs: 4px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;

    /* Grid */
    --max-content-width: 1200px;
    --gutter: 24px;

    /* Typography: technicalMono */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'JetBrains Mono', monospace;
    
    /* Neutral Scale */
    --neutral-50: #FAFAFA;
    --neutral-100: #F1F1F1;
    --neutral-200: #E4E4E4;
    --neutral-300: #D1D1D1;
    --neutral-400: #A8A8A8;
    --neutral-500: #7A7A7A;
    --neutral-600: #565656;
    --neutral-700: #3A3A3A;
    --neutral-800: #242424;
    --neutral-900: #141414;

    /* Accent: Orange */
    --color-accent: #0D9488;
    --color-accent-hover: #0F766E;

    /* Light Mode Defaults */
    --bg-color: var(--neutral-50);
    --surface-color: var(--neutral-100);
    --border-color: var(--neutral-300);
    --text-primary: var(--neutral-900);
    --text-secondary: var(--neutral-600);
    
    /* Minimalism Overrides */
    --border-radius: 0px;
    --shadow-soft: 0px 1px 3px rgba(0,0,0,0.08);
}

/* System Dark Mode */
@media (prefers-color-scheme: dark) {
    :root:not(.theme-light) {
        --bg-color: var(--neutral-900);
        --surface-color: var(--neutral-800);
        --border-color: var(--neutral-700);
        --text-primary: var(--neutral-50);
        --text-secondary: var(--neutral-400);
        --color-accent: #2DD4BF;
        --color-accent-hover: #0D9488;
    }
}

/* Manual Dark Mode Override */
:root.theme-dark {
    --bg-color: var(--neutral-900);
    --surface-color: var(--neutral-800);
    --border-color: var(--neutral-700);
    --text-primary: var(--neutral-50);
    --text-secondary: var(--neutral-400);
    --color-accent: #2DD4BF;
    --color-accent-hover: #0D9488;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    transition: background-color 300ms, color 300ms;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

/* Layout */
.container {
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: 0 var(--gutter);
}

.section-padding {
    padding: var(--space-4xl) 0;
}

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

.bg-surface {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.mt-xl {
    margin-top: var(--space-xl);
}

/* Split Layouts (Learned from LinkPass) */
.split-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3xl);
}

@media (min-width: 1024px) {
    .split-container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.section-content {
    flex: 1;
    width: 100%;
}

.section-visual {
    flex: 1;
    width: 100%;
    height: 400px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.text-left {
    text-align: left !important;
}

/* Typography Scales */
.hero-headline {
    font-size: 56px;
    margin-bottom: var(--space-lg);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
    text-align: left;
}

.hero-subheadline {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 800px;
    text-align: left;
    margin-left: 0;
}

.section-title {
    font-size: 31px;
    margin-bottom: var(--space-2xl);
    font-weight: 400;
}

.section-text {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 800px;
    line-height: 1.7;
}

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 16px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
    background-color: var(--color-accent);
    color: #FAFAFA;
}

.btn-primary:hover, .btn-primary:focus-visible {
    background-color: var(--color-accent-hover);
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

.btn-secondary:hover, .btn-secondary:focus-visible {
    border-color: var(--text-primary);
}

.btn-large {
    padding: var(--space-md) var(--space-2xl);
    font-size: 20px;
}

.icon-btn {
    padding: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Nav Bar */
.nav-bar {
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: var(--space-md) 0;
}

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

.logo {
    display: inline-block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.brand-teal {
    color: var(--color-accent);
}

.nav-icon {
    width: 24px;
    height: 24px;
}

.logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: none;
}

.nav-links a {
    margin: 0 var(--space-md);
    color: var(--text-secondary);
    font-size: 14.4px;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.login-link {
    font-size: 14.4px;
    color: var(--text-secondary);
}
.login-link:hover {
    color: var(--text-primary);
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
}

/* Hero Section */
.hero-section {
    padding: var(--space-4xl) 0;
    border-bottom: 1px solid var(--border-color);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-container {
        grid-template-columns: 1.1fr 0.9fr;
    }
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: flex-start;
}

.hero-visual {
    width: 100%;
    height: 400px;
    position: relative;
}

#three-canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Force all Three.js canvases to fit their containers and not overflow */
canvas {
    outline: none;
    width: 100% !important;
    height: 100% !important;
}

.justify-center {
    justify-content: center;
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    text-align: center;
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.stat-value {
    display: block;
    font-family: var(--font-heading);
    font-size: 49px;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
    letter-spacing: -0.02em;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Problem Section */
.problem-section {
    border-bottom: 1px solid var(--border-color);
}

.content-block {
    border-left: 1px solid var(--border-color);
    padding-left: var(--space-xl);
}

/* How It Works Section */
.steps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
}

@media (min-width: 768px) {
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.step-card {
    border-top: 1px solid var(--text-primary);
    padding-top: var(--space-lg);
}

.step-number {
    font-family: var(--font-heading);
    font-size: 20px;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--space-sm);
}

.step-title {
    font-size: 20px;
    margin-bottom: var(--space-sm);
}

.step-desc {
    color: var(--text-secondary);
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    border-top: 1px solid var(--border-color);
    padding-top: var(--space-2xl);
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.feature-item {
    text-align: left;
    padding: var(--space-xl);
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    /* No heavy shadow to differentiate from primary step cards */
}

.feature-item h3 {
    margin-bottom: var(--space-sm);
    font-size: 24px;
    font-weight: 600;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 16px;
}

/* Pricing Section */
.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    max-width: 900px;
    margin: 0 auto;
}

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

.pricing-card {
    border: 1px solid var(--border-color);
    padding: var(--space-2xl);
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color);
}

.pricing-tier {
    font-size: 24px;
    margin-bottom: var(--space-sm);
}

.pricing-price {
    font-size: 40px;
    font-family: var(--font-heading);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.pricing-price span {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 400;
    font-family: var(--font-body);
}

.pricing-desc {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    font-size: 14.4px;
    min-height: 48px;
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-2xl);
    flex-grow: 1;
}

.pricing-features li {
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 14.4px;
    color: var(--text-secondary);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-btn {
    width: 100%;
}

/* About Section */
.about-section {
    border-top: 1px solid var(--border-color);
}

/* FAQ Section */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-md) 0;
}

.faq-item summary {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    padding: var(--space-xs) 0;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-content {
    padding-top: var(--space-sm);
    padding-bottom: var(--space-md);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    padding: var(--space-3xl) 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

@media (min-width: 768px) {
    .footer-container {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-brand .copyright {
    color: var(--text-secondary);
    font-size: 12.8px;
    margin-top: var(--space-sm);
}

.footer-links {
    display: flex;
    gap: var(--space-4xl);
}

.link-column h4 {
    font-size: 14.4px;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.link-column a {
    display: block;
    color: var(--text-secondary);
    font-size: 14.4px;
    margin-bottom: var(--space-xs);
}

.link-column a:hover {
    color: var(--text-primary);
}

/* Compliance Banner */
.compliance-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--text-primary);
    color: var(--bg-color);
    padding: var(--space-md) 0;
    z-index: 1000;
    transform: translateY(100%);
    transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.compliance-banner.is-active {
    transform: translateY(0);
}

.banner-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    justify-content: space-between;
}

.banner-container p {
    font-size: 14.4px;
    margin: 0;
}

.banner-container a {
    color: var(--bg-color);
}

.banner-actions {
    display: flex;
    gap: var(--space-sm);
}

.banner-actions .btn-secondary {
    border-color: var(--bg-color);
    color: var(--bg-color);
}

.banner-actions .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

@media (min-width: 768px) {
    .banner-container {
        flex-direction: row;
    }
}

/* Legal Pages */
.legal-hero {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding-top: var(--space-4xl);
    padding-bottom: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.legal-content {
    max-width: 760px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.8;
}

.legal-content h2 {
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-md);
    font-size: 24px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--space-sm);
}

.legal-content h3 {
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-sm);
    font-size: 18px;
    color: var(--text-primary);
}

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

.legal-content ul, .legal-content ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-xl);
    color: var(--text-secondary);
}

.legal-content li {
    margin-bottom: var(--space-xs);
}

/* Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 600ms cubic-bezier(0.4, 0, 0.2, 1), transform 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays for grids */
.steps-grid .step-card:nth-child(1) { transition-delay: 100ms; }
.steps-grid .step-card:nth-child(2) { transition-delay: 200ms; }
.steps-grid .step-card:nth-child(3) { transition-delay: 300ms; }
.steps-grid .step-card:nth-child(4) { transition-delay: 400ms; }

.features-grid .feature-item:nth-child(1) { transition-delay: 100ms; }
.features-grid .feature-item:nth-child(2) { transition-delay: 200ms; }
.features-grid .feature-item:nth-child(3) { transition-delay: 100ms; }
.features-grid .feature-item:nth-child(4) { transition-delay: 200ms; }

.pricing-grid .pricing-card:nth-child(1) { transition-delay: 100ms; }
.pricing-grid .pricing-card:nth-child(2) { transition-delay: 200ms; }