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

:root {
    /* Colors - Cursor.com light theme palette */
    --bg-primary: #fafafa;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #ffffff;
    --text-primary: #000000;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --accent-purple: #8b5cf6;
    --accent-blue: #3b82f6;
    --border-color: rgba(0, 0, 0, 0.08);
    --glass-bg: rgba(0, 0, 0, 0.02);
    --glass-border: rgba(0, 0, 0, 0.08);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography - Inter font like Cursor */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   Navigation
   ========================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 0;
    background: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.nav.scrolled {
    padding: 1rem 0;
    background: rgba(250, 250, 250, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.logo-text {
    color: var(--text-primary);
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color 0.2s ease;
    position: relative;
}

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

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

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

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.08;
    animation: float 25s infinite ease-in-out;
}

.orb-1 {
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.2), transparent 70%);
    top: -300px;
    left: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15), transparent 70%);
    bottom: -200px;
    right: -150px;
    animation-delay: 10s;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 90% 60% at 50% 50%, black 30%, transparent 100%);
    opacity: 0.3;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

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

.hero-title {
    font-size: clamp(3rem, 10vw, 5.5rem);
    font-weight: 700;
    line-height: 1.05;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.title-line {
    display: block;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.2s;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--text-secondary);
    line-height: 1.7;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.4s;
    max-width: 700px;
    margin: 0 auto;
    font-weight: 400;
    letter-spacing: -0.01em;
}

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

/* ==========================================
   Content Sections
   ========================================== */
.content-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    position: relative;
}

.content-section.alt {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.content-text {
    max-width: 800px;
    margin: 0 auto;
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--text-secondary);
    line-height: 1.75;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.content-text p {
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   Focus Areas Grid
   ========================================== */
.focus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.focus-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: all 0.2s ease;
    backdrop-filter: blur(20px) saturate(180%);
}

.focus-card:hover {
    transform: translateY(-2px);
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
}

.focus-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.focus-description {
    color: var(--text-secondary);
    line-height: 1.65;
    font-size: 0.9375rem;
    font-weight: 400;
}

/* ==========================================
   Build List
   ========================================== */
.build-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

.build-item {
    padding: var(--spacing-lg);
    border-left: 2px solid rgba(0, 0, 0, 0.1);
    background: var(--glass-bg);
    border-radius: 8px;
    transition: all 0.2s ease;
    backdrop-filter: blur(20px) saturate(180%);
}

.build-item:hover {
    transform: translateX(4px);
    background: rgba(0, 0, 0, 0.03);
    border-left-color: rgba(0, 0, 0, 0.15);
}

.build-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.build-description {
    color: var(--text-secondary);
    line-height: 1.65;
    font-size: 0.9375rem;
    font-weight: 400;
}

/* ==========================================
   Principles Grid
   ========================================== */
.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.principle-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: all 0.2s ease;
    backdrop-filter: blur(20px) saturate(180%);
    text-align: center;
}

.principle-card:hover {
    transform: translateY(-2px);
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
}

.principle-title {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.principle-description {
    color: var(--text-secondary);
    line-height: 1.65;
    font-size: 0.9375rem;
    font-weight: 400;
}

/* ==========================================
   Audience Grid
   ========================================== */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.audience-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: all 0.2s ease;
    backdrop-filter: blur(20px) saturate(180%);
}

.audience-card:hover {
    transform: translateY(-2px);
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
}

.audience-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.audience-description {
    color: var(--text-secondary);
    line-height: 1.65;
    font-size: 0.9375rem;
    font-weight: 400;
}

/* ==========================================
   Involve List
   ========================================== */
.involve-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.involve-item {
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    position: relative;
    padding-left: var(--spacing-xl);
    backdrop-filter: blur(20px) saturate(180%);
    font-weight: 400;
}

.involve-item::before {
    content: '→';
    position: absolute;
    left: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s ease;
    opacity: 0.6;
}

.involve-item:hover {
    transform: translateX(4px);
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
    color: var(--text-primary);
}

.involve-item:hover::before {
    color: var(--text-primary);
}

/* ==========================================
   Contact Link
   ========================================== */
.contact-link {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: rgba(0, 0, 0, 0.3);
    text-underline-offset: 3px;
    transition: all 0.2s ease;
}

.contact-link:hover {
    color: var(--text-primary);
    text-decoration-color: rgba(0, 0, 0, 0.6);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-lg);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    font-weight: 400;
}

.footer-social {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.social-link {
    color: var(--text-tertiary);
    transition: color 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

.social-link svg {
    width: 20px;
    height: 20px;
}

/* ==========================================
   Scroll Animations
   ========================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.875rem;
    }
    
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
        min-height: 90vh;
    }
    
    .focus-grid,
    .principles-grid,
    .audience-grid {
        grid-template-columns: 1fr;
    }
    
    .content-section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
}