:root {
    /* Brand Colors */
    --primary: #2962ff;
    --primary-dark: #1e4bd8;
    --primary-light: #5c8fff;
    --primary-50: rgba(41, 98, 255, 0.05);
    --primary-100: rgba(41, 98, 255, 0.1);
    --primary-200: rgba(41, 98, 255, 0.2);
    
    /* Secondary Colors */
    --secondary: #ffd700;
    --secondary-dark: #e6c200;
    --secondary-light: #ffe033;
    
    /* Success Colors */
    --success: #00c853;
    --success-dark: #00a344;
    --success-light: #33d375;
    
    /* Error Colors */
    --error: #ff5252;
    --error-dark: #e64a4a;
    --error-light: #ff7575;
    
    /* Neutral Colors */
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f5;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.5rem;
    --spacing-6: 2rem;
    --spacing-8: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Selection */
    --selection-border: 3px solid var(--primary);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-all: all 0.2s ease-in-out;
    --transition-transform: transform 0.2s ease-in-out;
    --transition-opacity: opacity 0.2s ease-in-out;
}

/* Base Styles */
html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--gray-900);
    background-color: var(--gray-50);
    margin: 0;
    padding: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: var(--spacing-4);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 2rem); }
h4 { font-size: clamp(1.125rem, 2vw, 1.75rem); }
h5 { font-size: clamp(1rem, 1.5vw, 1.5rem); }
h6 { font-size: clamp(0.875rem, 1vw, 1.25rem); }

p {
    margin-top: 0;
    margin-bottom: var(--spacing-4);
}

/* Links */
a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-all);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

/* Grid System */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--spacing-4));
}

.col {
    flex: 1;
    padding: 0 var(--spacing-4);
}

/* Responsive Breakpoints */
@media (max-width: 576px) {
    .container {
        max-width: 100%;
    }
}

@media (min-width: 576px) {
    .container {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 720px;
    }
}

@media (min-width: 992px) {
    .container {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}