/* Modern AI Website - Main Styles */
/* Core layout and base styles - Components and animations are modularized */

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

:root {
    /* Modern Dark Theme Color Palette */
    --bg-primary: #000000;           /* Pure black backgrounds */
    --bg-secondary: #0a0a0a;         /* Slightly lighter black */
    --bg-tertiary: #1a1a1a;          /* Tertiary background */
    --bg-card: #111111;              /* Card backgrounds */
    --bg-elevated: #1a1a1a;          /* Elevated surfaces */
    --text-primary: #ffffff;         /* Pure white text */
    --text-secondary: #a3a3a3;       /* Gray text */
    --text-muted: #666666;           /* Muted text */
    --border-subtle: #1a1a1a;        /* Subtle borders */
    --border-medium: #333333;        /* Medium borders */
    
    /* Modern Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Primary Color for Focus States */
    --primary: #667eea;
    
    /* Typography Scale - Modern */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */
    --font-size-6xl: 3.75rem;     /* 60px */
    --font-size-7xl: 4.5rem;      /* 72px */
    --font-size-8xl: 6rem;        /* 96px */
    
    /* Spacing Scale - Mathematical Precision */
    --spacing-xs: 0.5rem;     /* 8px */
    --spacing-sm: 1rem;       /* 16px */
    --spacing-md: 1.5rem;     /* 24px */
    --spacing-lg: 2rem;       /* 32px */
    --spacing-xl: 3rem;       /* 48px */
    --spacing-2xl: 4rem;      /* 64px */
    --spacing-3xl: 6rem;      /* 96px */
    --spacing-4xl: 8rem;      /* 128px */
    
    /* Modern Design Tokens */
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Shadows - Subtle Dark Theme */
    --shadow-sm: 0 1px 2px rgba(255, 255, 255, 0.05);
    --shadow-md: 0 4px 6px rgba(255, 255, 255, 0.05);
    --shadow-lg: 0 10px 15px rgba(255, 255, 255, 0.1);
    --shadow-xl: 0 20px 25px rgba(255, 255, 255, 0.1);
    --shadow-2xl: 0 25px 50px rgba(255, 255, 255, 0.15);
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1010;
    --z-fixed: 1020;
    --z-modal: 1030;
    --z-tooltip: 1040;
}

/* Base Styles - Modern Typography */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Modern Typography System */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.025em;
}

h1 { 
    font-size: clamp(2.5rem, 6vw, 4rem); 
    font-weight: 700; 
}

h2 { 
    font-size: clamp(2rem, 4vw, 3rem); 
    font-weight: 600; 
}

h3 { 
    font-size: clamp(1.5rem, 3vw, 2rem); 
    font-weight: 600; 
}

h4 { 
    font-size: var(--font-size-xl); 
    font-weight: 600; 
}

h5 { 
    font-size: var(--font-size-lg); 
    font-weight: 600; 
}

h6 { 
    font-size: var(--font-size-base); 
    font-weight: 600; 
}

p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

/* Gradient Text System */
.gradient-text-hero {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    line-height: 1.1;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background-size: 200% 200%;
    animation: gradientShift 4s ease infinite;
}

.gradient-text-primary {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.gradient-text-accent {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.gradient-text-success {
    background: var(--gradient-success);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

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

/* Hero Section - Modern & Minimal */
.hero {
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4xl) var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(102, 126, 234, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-xl);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.6;
    font-weight: 400;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

/* Features Section - Clean Grid */
.features-section {
    background: var(--bg-primary);
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    line-height: 1.7;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* About Section */
.about-section {
    background: var(--bg-secondary);
    padding: var(--spacing-4xl) 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.about-text h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-xl);
    line-height: 1.2;
}

.about-text p {
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-lg);
    line-height: 1.7;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.about-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* CTA Section */
.cta-section {
    background: var(--bg-primary);
    padding: var(--spacing-4xl) var(--spacing-lg);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.cta-content p {
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-lg);
    line-height: 1.7;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.footer-brand {
    max-width: 300px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: var(--font-size-base);
    margin-top: var(--spacing-md);
}

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

.footer-column h4 {
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color 0.2s ease;
}

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

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Accessibility */
.skip-nav {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 100;
}

.skip-nav:focus {
    top: 6px;
}

.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Focus States */
.user-is-tabbing *:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* High Contrast Support */
.high-contrast {
    --text-secondary: #cccccc;
    --border-subtle: #333333;
    --border-medium: #666666;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-3xl) var(--spacing-lg);
    }
    
    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .features-section,
    .about-section,
    .cta-section {
        padding: var(--spacing-3xl) 0;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}