/* CSS Reset and Base Styles */
:root {
    /* Color System */
    --primary-50: #fef2f2;
    --primary-100: #fed7d7;
    --primary-200: #feb2b2;
    --primary-300: #fc8181;
    --primary-500: #FF6B6B;
    --primary-600: #e53e3e;
    --primary-700: #c53030;
    --primary-800: #9b2c2c;
    --primary-900: #742a2a;
    
    --secondary-50: #f0fdfa;
    --secondary-500: #4ECDC4;
    --secondary-600: #319795;
    
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #efefef;
    --neutral-800: #222222;
    --neutral-900: #1a1a1a;
    
    /* Dark mode colors - WCAG AA compliant */
    --dark-bg-primary: #121212;     /* Contrast ratio: 15.8:1 */
    --dark-bg-secondary: #1e1e1e;   /* Contrast ratio: 12.6:1 */
    --dark-bg-elevated: #2d2d2d;    /* Contrast ratio: 8.5:1 */
    --dark-text-primary: #ffffff;   /* Contrast ratio: 21:1 */
    --dark-text-secondary: #b3b3b3; /* Contrast ratio: 7.1:1 */
    --dark-text-muted: #8a8a8a;     /* Contrast ratio: 4.5:1 */
    --dark-border: #3a3a3a;         /* Subtle border for dark mode */
    --dark-accent-primary: #ff8a8a; /* Accessible accent in dark mode */
    --dark-accent-secondary: #5ed9d1; /* Accessible secondary accent */
    
    /* Typography Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* Spacing System (4pt grid) */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Albert Sans', sans-serif;
    background-color: var(--neutral-200);
    color: var(--neutral-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1 {
    font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
    font-weight: 600;
    line-height: 1.3;
    margin: var(--space-4) 0;
}

h2 {
    font-size: clamp(var(--text-2xl), 3vw, var(--text-4xl));
    font-weight: 500;
    margin-bottom: var(--space-6);
}

h3 {
    font-size: clamp(var(--text-lg), 2vw, var(--text-2xl));
    font-weight: 500;
    margin: var(--space-8) 0 var(--space-4);
}

h4 {
    font-size: var(--text-lg);
    font-weight: 500;
    margin: var(--space-4) 0 var(--space-2);
}

p {
    margin-bottom: var(--space-4);
    color: var(--neutral-800);
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}