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

:root {
    /* Colors inspired by Apple's design system */
    --color-primary: #007AFF;
    --color-primary-hover: #0056CC;
    --color-secondary: #F2F2F7;
    --color-accent: #FF3B30;
    --color-success: #34C759;
    --color-text-primary: #1D1D1F;
    --color-text-secondary: #86868B;
    --color-text-tertiary: #C7C7CC;
    --color-background: #FFFFFF;
    --color-background-secondary: #F2F2F7;
    --color-border: #E5E5EA;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Borders */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --border-radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo .logo-text {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 400;
    transition: color var(--transition-fast);
}

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

.nav-link.cta-button {
    background: var(--color-primary);
    color: white;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--border-radius-lg);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-link.cta-button:hover {
    background: var(--color-primary-hover);
    color: white;
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    padding: calc(70px + var(--space-24)) 0 var(--space-24);
    background: linear-gradient(135deg, #F8F9FA 0%, #E9ECEF 100%);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.hero-highlight {
    background: linear-gradient(90deg, var(--color-primary), #5AC8FA);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    align-items: center;
}

/* Code Preview */
.code-preview {
    background: var(--color-text-primary);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform var(--transition-slow);
}

.code-preview:hover {
    transform: perspective(1000px) rotateY(-2deg) rotateX(2deg);
}

.code-header {
    background: #2A2A2E;
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.code-dots {
    display: flex;
    gap: var(--space-2);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #FF5F57; }
.dot.yellow { background: #FFBD2E; }
.dot.green { background: #28CA42; }

.code-title {
    color: #A0A0A0;
    font-size: var(--font-size-sm);
    margin-left: auto;
}

.code-content {
    padding: var(--space-6);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.code-content pre {
    color: #F8F8F2;
}

.code-comment { color: #75715E; }
.code-import { color: #F92672; }
.code-string { color: #E6DB74; }
.code-keyword { color: #66D9EF; }
.code-function { color: #A6E22E; }
.code-property { color: #F8F8F2; }
.code-method { color: #A6E22E; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-6);
    border-radius: var(--border-radius-lg);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    font-size: var(--font-size-base);
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--color-background-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-large {
    padding: var(--space-5) var(--space-8);
    font-size: var(--font-size-lg);
}

/* Sections */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Features Section */
.features {
    padding: var(--space-24) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.feature-card {
    text-align: center;
    padding: var(--space-8);
    background: var(--color-background);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-primary), #5AC8FA);
    border-radius: var(--border-radius-2xl);
    color: white;
    margin-bottom: var(--space-6);
    margin: 0 auto var(--space-6);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.feature-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Tech Stack Section */
.tech-stack {
    padding: var(--space-24) 0;
    background: var(--color-background-secondary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-6);
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    transition: transform var(--transition-fast);
}

.tech-item:hover {
    transform: translateY(-2px);
}

.tech-name {
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.tech-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* Demo Section */
.demo {
    padding: var(--space-24) 0;
}

.demo-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.demo-preview {
    position: relative;
    background: var(--color-background);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.demo-iframe {
    width: 100%;
    height: 500px;
    border: none;
}

.demo-info h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.demo-info p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

.demo-features {
    list-style: none;
    margin-bottom: var(--space-8);
}

.demo-features li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-3);
    color: var(--color-text-secondary);
}

.demo-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 600;
}

/* CTA Section */
.cta {
    padding: var(--space-24) 0;
    background: linear-gradient(135deg, var(--color-primary), #5AC8FA);
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}

.cta-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-8);
    opacity: 0.9;
}

.cta-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.cta-note {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/* Footer */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--color-text-primary);
    color: white;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: var(--space-16);
    margin-bottom: var(--space-12);
}

.footer-brand .logo-text {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-4);
    display: block;
}

.footer-tagline {
    color: var(--color-text-tertiary);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-column h4 {
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer-column a {
    display: block;
    color: var(--color-text-tertiary);
    text-decoration: none;
    margin-bottom: var(--space-3);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid #333;
    color: var(--color-text-tertiary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .demo-container {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

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

.feature-card,
.tech-item {
    animation: fadeInUp var(--transition-slow) ease-out;
}

/* Smooth scrolling offset for fixed nav */
html {
    scroll-padding-top: 70px;
}