/* ==========================================================================
   DEUTSCHE-GESCHICHTE.ONLINE - MAIN STYLESHEET
   Description: Elegant, library-style design without frills
   ========================================================================== */

/* CSS Variables */
:root {
    --primary-bg: #f8f9fa;
    --content-bg: #d0e0e3;
    --text-primary: #1a252f;
    --text-secondary: #d0e0e3;
    --text-light: #1a252f;
    --accent-color: #1a252f;
    --border-color: #1a252f;
    --hover-color: #f1f3f4;
    --shadow: rgba(0,0,0,0.12);
    --max-width: 1200px;
    --content-width: 800px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --donation-bg: #e9ecef;
    --donation-border: #ced4da;
    --color-accent-green: #20c997;
    --color-primary: #1a252f;
    --font-size-sm: 0.9rem;
    --font-size-xs: 0.8rem;
}

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

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.7;
    font-weight: 400;
}

/* Donation Banner */
.donation-banner {
    background-color: var(--donation-bg);
    border-bottom: 1px solid var(--donation-border);
    padding: var(--spacing-xs) 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.donation-banner-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.donation-text {
    margin: 0;
}

.donation-links {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.donation-link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    background-color: var(--content-bg);
    color: var(--accent-color);
    text-decoration: none;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.donation-link:hover {
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: Georgia, 'Times New Roman', serif;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

h1 { font-size: 2.2rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.2rem; }

p {
    margin-bottom: var(--spacing-sm);
    max-width: 65ch;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

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

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

/* Header & Navigation */
header {
    background-color: var(--content-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-family: Georgia, serif;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: all 0.2s ease;
}

.nav-links a:hover {
    background-color: var(--hover-color);
    text-decoration: none;
}

/* Hero Section */
.hero {
    background-color: var(--content-bg);
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn:hover {
    background-color: var(--text-primary);
    color: white;
    text-decoration: none;
}

.btn-secondary {
    background-color: var(--content-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--hover-color);
    color: var(--text-primary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
}

/* Card Layout */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.card {
    background-color: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px var(--shadow);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.card-header {
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
}

.card-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Resource Cards */
.resource-card {
    background-color: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px var(--shadow);
}

.resource-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.resource-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--accent-color);
}

.resource-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* Timeline */
.timeline {
    position: relative;
    margin: var(--spacing-xl) 0;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 2rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
    margin-left: 4rem;
}

.timeline-marker {
    position: absolute;
    left: -5rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    background-color: var(--accent-color);
    border-radius: 50%;
    border: 3px solid var(--content-bg);
}

.timeline-content {
    background-color: var(--content-bg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.timeline-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
}

.timeline-epoch {
    display: inline-block;
    background-color: var(--hover-color);
    color: var(--text-secondary);
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

/* Epochs Overview */
.epochen-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.epoche-card {
    background-color: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.epoche-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px var(--shadow);
}

.epoche-titel {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-xs);
    color: var(--accent-color);
}

.epoche-zeitraum {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.epoche-beschreibung {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.epoche-stats {
    font-size: 0.9rem;
    color: var(--text-light);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

/* Article Layout */
.artikel-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.artikel-datum {
    font-size: 1.1rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.artikel-titel {
    font-size: 2.2rem;
    margin-bottom: var(--spacing-md);
}

.artikel-meta {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.artikel-content {
    max-width: var(--content-width);
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.8;
}

.artikel-content h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.artikel-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

/* Article Navigation */
.artikel-navigation {
    display: flex;
    justify-content: space-between;
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--border-color);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--text-primary);
}

/* Search */
.search-container {
    max-width: 600px;
    margin: var(--spacing-xl) auto;
}

.search-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.search-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

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

.search-result {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.search-result:last-child {
    border-bottom: none;
}

.search-result-title {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
}

.search-result-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* Footer */
footer {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.footer-section h3 {
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.footer-section p,
.footer-section li {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #fff;
    text-decoration: underline;
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }
    
    .donation-banner-content {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    nav {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .nav-links {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .epochen-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline {
        margin-left: var(--spacing-md);
        margin-right: var(--spacing-md);
    }
    
    .timeline::before {
        left: 1rem;
    }
    
    .timeline-item {
        margin-left: 2.5rem;
    }
    
    .timeline-marker {
        left: -3.5rem;
    }
    
    .artikel-titel {
        font-size: 1.8rem;
    }
    
    .artikel-navigation {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .search-form {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container,
    .content-container {
        padding: 0 1rem;
    }
    
    .hero {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .card,
    .timeline-content,
    .epoche-card {
        padding: var(--spacing-md);
    }
    
    .donation-link {
        font-size: 0.8rem;
        padding: 0.2rem 0.5rem;
    }
}

/* Print Styles */
@media print {
    .donation-banner,
    header,
    .hero-buttons,
    .artikel-navigation,
    footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .artikel-content {
        max-width: none;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

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

/* Focus Styles for Keyboard Navigation */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}