/**
 * Global Styles & Theme Variables
 * This file contains CSS variables for theming and global styles
 */

:root {
    /* Layout */
    --header-height: 100px;
    --max-content-width: 1200px;

    /* Colors - Primary */
    --color-primary: #0066cc;
    --color-primary-dark: #0052a3;
    --color-primary-light: #007bff;
    --color-primary-lighter: #f0f8ff;

    /* Colors - Semantic */
    --color-success: #28a745;
    --color-success-dark: #155724;
    --color-success-bg: #d4edda;
    --color-success-border: #c3e6cb;

    --color-error: #dc3545;
    --color-error-dark: #e53e3e;
    --color-error-bg: #f8d7da;
    --color-error-border: #f5c6cb;

    --color-info: #007bff;
    --color-info-dark: #0056b3;

    /* Colors - Neutral */
    --color-text: #333;
    --color-text-light: #666;
    --color-text-lighter: #999;

    --color-bg: #ffffff;
    --color-bg-light: #f8f9fa;
    --color-bg-lighter: #f5f5f5;

    --color-border: #ddd;
    --color-border-light: #e2e8f0;
    --color-border-lighter: #eee;

    --color-gray-50: #f8fafc;
    --color-gray-100: #f7fafc;
    --color-gray-200: #e9ecef;
    --color-gray-300: #e2e8f0;
    --color-gray-400: #cbd5e0;
    --color-gray-500: #a0aec0;
    --color-gray-600: #718096;
    --color-gray-700: #4a5568;
    --color-gray-800: #2d3748;
    --color-gray-900: #1a202c;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --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);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Typography */
    --font-family-base: 'Arial', sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --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: 2rem;
    --font-size-4xl: 3rem;

    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;
}

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

/* Base Styles */
body {
    font-family: var(--font-family-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
}

main {
    margin-top: var(--header-height);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight);
    font-weight: var(--font-weight-bold);
}

h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

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

/* Utility Classes */
.container {
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: var(--spacing-md);
}

.text-center {
    text-align: center;
}

.hidden {
    display: none;
}

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