/* ===================================================================
   CSS Variables and Reset
   =================================================================== */

:root {
    /* Color Palette */
    --primary-color: #005A9C;
    --primary-light: #1E7BC8;
    --primary-dark: #003D6B;
    --secondary-color: #EBF4FA;
    --accent-color: #FF6B35;
    --text-color: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --background-color: #FFFFFF;
    --background-light: #F8F9FA;
    --border-color: #E0E0E0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-h1: 2.5rem;
    --font-size-h2: 2rem;
    --font-size-h3: 1.5rem;
    --font-size-h4: 1.25rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* CSS Reset */
* {
    box-sizing: border-box;
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd {
    margin: 0;
    padding: 0;
}

/* ===================================================================
   Base Styles
   =================================================================== */

html {
    scroll-behavior: smooth;
}

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

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

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

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

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

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

/* Lists */
ul, ol {
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

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

/* Images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

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

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

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--border-radius);
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

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

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

.site-header {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #ffffff 100%);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo a {
    text-decoration: none;
    color: inherit;
}

.logo h1 {
    font-size: var(--font-size-h2);
    margin: 0;
    color: var(--primary-color);
}

.tagline {
    font-size: var(--font-size-small);
    color: var(--text-light);
    margin: 0;
    font-weight: 300;
}

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

.main-nav {
    position: relative;
}

.menu-toggle {
    display: none;
    background: none;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xs);
    cursor: pointer;
    transition: var(--transition);
}

.menu-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

.hamburger {
    display: block;
    width: 20px;
    height: 2px;
    background: currentColor;
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: currentColor;
    transition: var(--transition);
}

.hamburger::before { top: -6px; }
.hamburger::after { top: 6px; }

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-md);
}

.nav-menu a {
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
	display: flex;
	align-items: center;
	justify-content: center;
	text-align: center;
	min-height: 40px;

}

.nav-menu a:hover,
.nav-menu a:focus {
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
}

.nav-menu a.active {
    background-color: var(--primary-color);
    color: white;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-arrow {
    font-size: 0.8em;
    margin-left: var(--spacing-xs);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px var(--shadow-color);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1000;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu {
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-xs);
}

.dropdown-menu a {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: calc(var(--border-radius) / 2);
	justify-content: flex-start;
}

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

.hero-section {
    background: linear-gradient(rgba(0, 90, 156, 0.8), rgba(0, 90, 156, 0.6)),
                url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 400"><rect fill="%23005A9C" width="1200" height="400"/><path fill="%23ffffff" fill-opacity="0.1" d="M0,200 Q300,100 600,200 T1200,200 V400 H0 Z"/></svg>');
    background-size: cover;
    background-position: center;
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero-content h2 {
    color: white;
    font-size: var(--font-size-h1);
    margin-bottom: var(--spacing-sm);
}

.hero-text {
    font-size: var(--font-size-large);
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.95;
}

figure img {									/*OS*/
    display: block;
    margin: 0 auto;
}


/* ===================================================================
   Main Content Styles
   =================================================================== */

.main-content {
    padding: var(--spacing-xl) 0;
}

.container {
    max-width: 1200px;        					/* Maximale Breite begrenzen (OS) */
    margin: 0 auto;           					/* Zentriert den Container (OS)  */
    padding: 0 var(--spacing-lg); 				/* Links/rechts Abstand (OS)  */
}

.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.primary-content {
    background: white;
}

.intro-section {
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
}

/* Content Cards */
.featured-content {
    margin-bottom: var(--spacing-lg);
}

.content-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.content-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.content-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
}

.content-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.content-card h4 {
    margin-bottom: var(--spacing-sm);
}

.content-card h4 a {
    color: var(--primary-color);
    text-decoration: none;
}

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

.card-link {
    font-weight: 500;
    color: var(--primary-color);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.card-link:hover {
    color: var(--primary-light);
}

/* ===================================================================
   Sidebar Styles
   =================================================================== */

.sidebar {
    position: sticky;
    top: 8em;
    align-self: flex-start;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    background: var(--background-light);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: var(--transition);
}

.sidebar:hover {
    box-shadow: 0 4px 25px var(--shadow-color);
}

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

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-section h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--primary-color);
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-color);
}

.sidebar-menu a:hover {
    background-color: white;
    color: var(--primary-color);
    text-decoration: none;
    box-shadow: 0 2px 8px var(--shadow-color);
}

.menu-icon {
    margin-right: var(--spacing-sm);
    font-size: 1.2em;
}

[id]::before {
    content: '';
    display: block;
    height: 10rem;        /* Header-Höhe + gewünschter Abstand */
    margin-top: -10rem;   /* Negativ, um das Layout nicht zu verschieben */
    visibility: hidden;
}

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

.site-footer {
    background: var(--primary-dark);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-large);
}

.footer-section address {
    font-style: normal;
    line-height: 1.6;
}

.footer-section a {
    color: #B8D4EA;
}

.footer-section a:hover {
    color: white;
}

.footer-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.tech-info {
    font-size: var(--font-size-small);
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: var(--font-size-small);
    color: #B8D4EA;
}

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

/* Tablet Styles */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .sidebar {
        position: static;
        max-height: none;
        order: -1;
    }
    
    .content-cards {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

/* Mobile Styles */
@media (max-width: 768px) {
    :root {
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
        --spacing-xl: 2rem;
        --spacing-lg: 1.5rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    /* Header adjustments */
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .logo {
        width: 100%;
    }
    
    .main-nav {
        width: 100%;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        box-shadow: 0 4px 20px var(--shadow-color);
        padding: var(--spacing-sm);
        gap: 0;
    }
    
    .nav-menu.open {
        display: flex;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        padding: var(--spacing-sm);
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu li:last-child a {
        border-bottom: none;
    }
    
    /* Dropdown adjustments for mobile */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background: var(--background-light);
        margin-top: var(--spacing-xs);
    }
    
    /* Hero section */
    .hero-section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-content h2 {
        font-size: var(--font-size-h2);
    }
    
    .hero-text {
        font-size: var(--font-size-base);
    }
    
    /* Content cards */
    .content-cards {
        grid-template-columns: 1fr;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* Small mobile devices */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .intro-section {
        padding: var(--spacing-md);
    }
    
    .sidebar {
        padding: var(--spacing-md);
    }
    
    .content-card {
        padding: var(--spacing-md);
    }
}

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

@media print {
    .menu-toggle,
    .site-footer,
    .sidebar {
        display: none;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    a {
        color: var(--text-color);
        text-decoration: underline;
    }
    
    .hero-section {
        background: none;
        color: var(--text-color);
    }
}