:root {
    /* Primary Colors */
    --primary-black: #000000;
    --primary-blue: #0a2463;
    --primary-white: #ffffff;
    
    /* Secondary Colors */
    --secondary-blue: #5d8cff;
    --accent-blue: #3a6ee0;
    --light-blue: #e6f0ff;
    
    /* Neutral Colors */
    --gray-900: #1a1a1a;
    --gray-800: #2d2d2d;
    --gray-700: #4a4a4a;
    --gray-600: #666666;
    --gray-500: #888888;
    --gray-400: #b0b0b0;
    --gray-300: #d0d0d0;
    --gray-200: #e5e5e5;
    --gray-100: #f5f5f5;
    
    /* Semantic Colors */
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-secondary: 'Roboto Condensed', 'Arial Narrow', 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;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-base: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* Breakpoints */
    --breakpoint-xs: 0;
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    --breakpoint-xxl: 1400px;
    
    /* Container Widths */
    --container-sm: 540px;
    --container-md: 720px;
    --container-lg: 960px;
    --container-xl: 1140px;
    --container-xxl: 1320px;
}

/* Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    margin: 0;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--primary-white);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-secondary);
    font-weight: 700;
    line-height: 1.3;
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

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

p {
    margin-top: 0;
    margin-bottom: var(--spacing-base);
}

a {
    color: var(--secondary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-blue);
    text-decoration: underline;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-blue);
    color: white;
    padding: 8px;
    z-index: 1000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

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

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-base);
    line-height: 1.5;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

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

.btn-primary:hover {
    color: white;
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
}

.btn-secondary {
    color: var(--primary-blue);
    background-color: transparent;
    border-color: var(--primary-blue);
}

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

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

.btn-outline:hover {
    color: white;
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
}