/* ========================================
   Ethnic Cleansing Study - Main Stylesheet
   Palette: Somber Neutrals with Accent
   ======================================== */

:root {
    /* Color Palette */
    --bg-primary: #2B2D2F;
    --text-primary: #E8E6E3;
    --accent-burgundy: #8B4049;
    --accent-steel: #4A5A6A;
    --border-slate: #58595B;
    
    /* Typography */
    --font-primary: 'Merriweather', Georgia, serif;
    --font-secondary: 'Open Sans', 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-secondary);
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

a {
    color: var(--accent-steel);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-burgundy);
}

/* ========================================
   Header & Navigation
   ======================================== */

.site-header {
    position: sticky;
    top: 0;
    background-color: rgba(43, 45, 47, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-slate);
    padding: var(--spacing-sm) 0;
    z-index: 1000;
    transition: box-shadow var(--transition-medium);
}

.site-header.scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
}

.main-nav a {
    font-size: 1rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
    border-bottom-color: var(--accent-burgundy);
}

/* ========================================
   Breadcrumbs
   ======================================== */

.breadcrumbs {
    max-width: 1200px;
    margin: var(--spacing-md) auto;
    padding: 0 var(--spacing-md);
    font-size: 0.9rem;
    color: var(--accent-steel);
}

.breadcrumbs a {
    color: var(--accent-steel);
}

.breadcrumbs span {
    margin: 0 var(--spacing-xs);
    opacity: 0.5;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(135deg, #2B2D2F 0%, #3A3C3E 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(139, 64, 73, 0.03) 35px, rgba(139, 64, 73, 0.03) 70px);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--accent-steel);
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-cta {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--accent-burgundy);
    color: var(--text-primary);
    font-weight: 600;
    border-radius: 4px;
    transition: all var(--transition-medium);
    box-shadow: 0 4px 15px rgba(139, 64, 73, 0.3);
}

.hero-cta:hover {
    background-color: #9B5059;
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 64, 73, 0.4);
}

/* ========================================
   Main Content Container
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.section {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    text-align: center;
    color: var(--accent-burgundy);
    margin-bottom: var(--spacing-md);
    font-size: 2.2rem;
}

.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    font-size: 1.1rem;
    color: var(--accent-steel);
}

/* ========================================
   Card Grid
   ======================================== */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.card {
    background-color: rgba(88, 89, 91, 0.2);
    border: 1px solid var(--border-slate);
    border-radius: 8px;
    padding: var(--spacing-md);
    transition: all var(--transition-medium);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(139, 64, 73, 0.1), transparent);
    transition: left var(--transition-slow);
}

.card:hover::before {
    left: 100%;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-burgundy);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    background-color: rgba(88, 89, 91, 0.3);
}

.card-title {
    color: var(--accent-burgundy);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.card:hover .card-title {
    color: #9B5059;
}

.card-description {
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
    opacity: 0.9;
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.7;
    transition: transform var(--transition-medium);
}

.card:hover .card-icon {
    transform: scale(1.1);
}

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

.content-section {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.content-section h2 {
    color: var(--accent-burgundy);
    margin-top: var(--spacing-lg);
}

.content-section h3 {
    color: var(--accent-steel);
    margin-top: var(--spacing-md);
}

.content-section p {
    margin-bottom: var(--spacing-sm);
}

.content-section ul, 
.content-section ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.content-section li {
    margin-bottom: var(--spacing-xs);
}

/* ========================================
   Placeholder Elements
   ======================================== */

.placeholder {
    border: 2px dashed var(--border-slate);
    border-radius: 8px;
    padding: var(--spacing-lg);
    text-align: center;
    background-color: rgba(88, 89, 91, 0.1);
    margin: var(--spacing-md) 0;
}

.placeholder-icon {
    font-size: 3rem;
    color: var(--accent-steel);
    margin-bottom: var(--spacing-sm);
}

.placeholder-text {
    color: var(--accent-steel);
    font-style: italic;
}

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

.site-footer {
    border-top: 1px solid var(--border-slate);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    color: var(--accent-steel);
    font-size: 0.9rem;
}

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

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    body {
        font-size: 16px;
    }
    
    .hero h1 {
        font-size: 1.75rem;
    }
    
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}

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

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.hidden {
    display: none;
}