:root {
    /* Brand Colors */
    --bg-color: #FAFAF7; /* Warm cream base */
    --text-primary: #1A1A1A; /* Dark ink */
    --text-secondary: #5C5C59; /* Muted ink */
    --accent-muted: #E6E4DF;
    --accent-dark: #3D3C3A;
    --white: #FFFFFF;
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --space-sm: 0.5rem;
    --space-md: 1.5rem;
    --space-lg: 3rem;
    --space-xl: 6rem;
    --space-xxl: 10rem;
    
    /* Transitions */
    --transition-smooth: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--text-secondary);
}

/* Typography Hierarchy */
h1, h2, h3 {
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.headline {
    font-size: clamp(3rem, 6vw, 5rem);
    margin-bottom: var(--space-md);
}

.subhead {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-lg);
    line-height: 1.4;
}

.section-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.section-desc {
    font-size: clamp(1.1rem, 1.5vw, 1.35rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
    text-align: center;
}

/* Layout Utilities */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xxl) 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    z-index: 100;
    background: rgba(250, 250, 247, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wordmark {
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.03em;
}

.nav-links {
    display: none;
    gap: 2.5rem;
    font-size: 0.95rem;
}

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

/* Buttons */
.btn-primary {
    display: inline-block;
    background-color: var(--text-primary);
    color: var(--bg-color);
    padding: 1rem 2rem;
    border-radius: 100px;
    font-size: 1.1rem;
    font-weight: 500;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.btn-primary:hover {
    background-color: #000;
    transform: translateY(-2px);
    color: var(--white);
}

.btn-secondary {
    display: inline-block;
    border: 1px solid var(--accent-muted);
    padding: 0.6rem 1.2rem;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    padding-top: calc(var(--space-xxl) + 4rem);
    text-align: center;
    padding-inline: 2rem;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto var(--space-xl);
}

.eyebrow {
    display: inline-block;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.cta-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* iPhone Placeholder Mockup */
.iphone-frame {
    width: 320px;
    height: 650px;
    margin: 0 auto;
    background-color: var(--white);
    border-radius: 40px;
    border: 8px solid var(--accent-muted);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    position: relative;
    overflow: hidden;
}

.iphone-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 25px;
    background-color: var(--accent-muted);
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
    z-index: 10;
}

.mock-ui {
    padding: 4rem 1.5rem 2rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mock-header {
    text-align: left;
}

.mock-greeting {
    display: block;
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.mock-summary {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.mock-card {
    background-color: var(--bg-color);
    border-radius: 16px;
    height: 120px;
    width: 100%;
    border: 1px solid var(--accent-muted);
}

.mock-card-small {
    height: 80px;
}

/* Problem Section */
.problem {
    background-color: var(--white);
    border-top: 1px solid var(--accent-muted);
    border-bottom: 1px solid var(--accent-muted);
}

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

.problem-item {
    font-size: 1.25rem;
    color: var(--text-secondary);
    padding: 1.5rem 0;
    border-top: 1px solid var(--accent-muted);
}

.problem-conclusion {
    text-align: center;
    font-size: 2rem;
    font-weight: 400;
    letter-spacing: -0.02em;
}

/* Transformation Orbit Visual Placeholder */
.transformation {
    text-align: center;
}

.transformation-visual {
    margin-top: var(--space-xl);
    height: 400px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.orbit-system {
    position: relative;
    width: 300px;
    height: 300px;
}

.center-node {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--text-primary);
    color: var(--bg-color);
    padding: 1.5rem;
    border-radius: 50%;
    font-weight: 500;
    z-index: 2;
}

.orbit-node {
    position: absolute;
    background: var(--white);
    border: 1px solid var(--accent-muted);
    padding: 0.5rem 1rem;
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.n1 { top: 0; left: 50%; transform: translate(-50%, -50%); }
.n2 { bottom: 0; left: 50%; transform: translate(-50%, 50%); }
.n3 { top: 50%; left: 0; transform: translate(-50%, -50%); }
.n4 { top: 50%; right: 0; transform: translate(50%, -50%); }
.n5 { top: 15%; left: 15%; transform: translate(-50%, -50%); }
.n6 { bottom: 15%; right: 15%; transform: translate(50%, 50%); }

/* Intelligence Section */
.intelligence {
    background-color: var(--white);
}

.interaction-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.interaction-item {
    border: 1px solid var(--accent-muted);
    border-radius: 12px;
    padding: 2rem;
    background: var(--bg-color);
}

.interaction-query {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.interaction-result {
    color: var(--text-secondary);
}

/* Showcase Section */
.showcase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.showcase-card {
    padding: 2.5rem;
    border: 1px solid var(--accent-muted);
    border-radius: 16px;
    background: var(--white);
    transition: transform 0.3s ease;
}

.showcase-card:hover {
    transform: translateY(-4px);
}

.showcase-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.showcase-card p {
    color: var(--text-secondary);
}

/* General Sections */
.over-time, .collaboration, .privacy {
    text-align: center;
}

.over-time { background-color: var(--white); border-bottom: 1px solid var(--accent-muted); }
.collaboration { background-color: var(--bg-color); }
.privacy { background-color: var(--white); border-top: 1px solid var(--accent-muted); }

.privacy-content {
    max-width: 600px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Footer & CTA */
.cta-section {
    text-align: center;
    background-color: var(--bg-color);
    padding: 8rem 2rem;
}

.footer {
    border-top: 1px solid var(--accent-muted);
    background-color: var(--white);
    padding: 3rem 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    font-weight: 500;
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-smooth);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }