/**
 * Main Stylesheet - Global Styles
 * This file contains base styles used across all pages
 * Page-specific styles should be in their own CSS files
 */

/* ========================================
   CSS Reset & Base Styles
   ======================================== */

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

*::before,
*::after {
    box-sizing: inherit;
}

/* ========================================
   Typography
   ======================================== */

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 
                 Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 0.5em;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #764ba2;
    text-decoration: underline;
}

a:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
    z-index: 9999;
}

.skip-link:focus {
    position: fixed;
    top: 10px;
    left: 10px;
    width: auto;
    height: auto;
    padding: 10px 15px;
    background: #667eea;
    color: white;
    border-radius: 5px;
    font-weight: 600;
    text-decoration: none;
}

/* ========================================
   Layout
   ======================================== */

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    padding: 40px;
}

/* ========================================
   Header Styles
   ======================================== */

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid #667eea;
}

header h1 {
    color: #667eea;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
}

/* ========================================
   Navigation
   ======================================== */

nav {
    margin: 30px 0;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

nav li {
    margin: 0;
}

nav a {
    display: inline-block;
    padding: 10px 20px;
    background: #667eea;
    color: white;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
}

nav a:hover {
    background: #764ba2;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    color: #667eea;
    font-weight: 500;
}

.back-link:hover {
    text-decoration: underline;
}

/* ========================================
   Content Sections
   ======================================== */

section {
    margin-bottom: 40px;
}

section h2 {
    color: #667eea;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eee;
}

/* ========================================
   Cards
   ======================================== */

.card {
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    background: #fafafa;
    transition: all 0.3s ease;
}

.card:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
}

.card h3 {
    color: #333;
    margin-bottom: 10px;
}

/* ========================================
   Grid Layouts
   ======================================== */

.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn:hover {
    background: #764ba2;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.btn-secondary {
    background: #6c757d;
}

.btn-secondary:hover {
    background: #5a6268;
}

/* ========================================
   Forms
   ======================================== */

input,
textarea,
select {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #333;
}

/* ========================================
   Footer
   ======================================== */

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid #eee;
    color: #666;
    font-size: 0.95rem;
}

/* ========================================
   Utility Classes
   ======================================== */

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

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

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    nav ul {
        flex-direction: column;
        align-items: stretch;
    }
    
    nav a {
        text-align: center;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .container {
        padding: 15px;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    body {
        background: white;
        padding: 0;
    }
    
    .container {
        box-shadow: none;
        padding: 0;
    }
    
    nav,
    .back-link {
        display: none;
    }
}