/* ============================================
   CSS Variablen & Theme
   ============================================ */
:root {
    --color-primary: steelblue;
    --color-primary-dark: #1e5a8e;
    --color-secondary: #ffd700;
    --color-accent: #76B900;
    --color-text: #1a1a1a;
    --color-background: #ffffff;
    --color-muted: #666666;
    --color-border: #e0e0e0;
    --color-warning-bg: #fef9e7;
    --color-success-bg: #f0f9f0;
    
    --font-main: Verdana, Geneva, sans-serif;
    --font-heading: 'Courier New', Courier, monospace;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --max-width: 1200px;
    --border-radius: 4px;
    --header-spacing: 60px;
}

/* ============================================
   Reset & Grundlegendes
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-family: var(--font-main);
    font-weight: 500;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-background);
    min-height: 100vh;
}

a {
    color: #0066cc;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
}

a:hover, a:focus {
    color: #6d4aff;
    border-bottom-color: steelblue;
    outline: none;
}

/* ============================================
   Typografie
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

h1 {
    font-size: clamp(1.4rem, 2.5vw, 1.5rem);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-text);
}

h2 {
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-text);
}

h3 {
    font-size: 1.1rem;
    color: var(--color-primary-dark);
}

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

ul, ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

small {
    font-size: 0.875rem;
    color: var(--color-muted);
}

/* ============================================
   Layout
   ============================================ */
.wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    background-color: var(--color-background);
}

.site-header {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-background);
    color: var(--color-text);
}

.site-header.spacer {
    height: var(--header-spacing);
    background-color: var(--color-background);
}

.main-nav {
    background-color: var(--color-primary);
    font-family: var(--font-heading);
    font-size: clamp(1rem, 3vw, 1.7rem);  /* Responsiv: 16px - 22px */
    font-weight: bold;
    color: white;
    border-top: 2px solid var(--color-text);
    border-bottom: 2px solid var(--color-text);
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.main-nav .nav-link {
    display: block;
    padding: 0.4rem 2rem;
    color: white;
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.main-nav .nav-link:hover,
.main-nav .nav-link:focus {
    background-color: var(--color-secondary);
    color: var(--color-text);
}

.main-nav .nav-link.active {
    background-color: var(--color-accent);
    color: var(--color-text);
}

.container {
    padding: var(--spacing-lg);
}

/* ============================================
   Zwei-Spalten-Layout (Grid)
   ============================================ */
.about-section,
.teaching-section,
.r-section,
.publications-section,
.soccer-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.content-column,
.sidebar-column {
    background: var(--color-background);
}

/* Desktop: Zwei Spalten */
@media (min-width: 768px) {
    .about-section,
    .teaching-section,
    .r-section,
    .publications-section,
    .soccer-section {
        grid-template-columns: 1.15fr 1fr;  /* Links 15% breiter als rechts */
    }
    
    /*.sidebar-column {
        order: -1;
    }*/
}

/* ============================================
   Kontakt-Boxen
   ============================================ */
.contact-block {
    background-color: var(--color-success-bg);
    border: 1px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.contact-block h2 {
    font-size: 1rem;
    border-bottom: 1px solid var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

address {
    font-style: normal;
}

/* ============================================
   Lehrveranstaltungs-Karten
   ============================================ */
.module-card {
    background-color: var(--color-success-bg);
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.module-card h2 {
    font-size: 1.1rem;
    border-bottom: 1px solid var(--color-accent);
}

.announcement {
    background-color: var(--color-warning-bg);
    border-left-color: #ff9800;
}

/* ============================================
   Sidebar Karten
   ============================================ */
.thesis-card,
.topics-card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.topics-card ul {
    margin-left: var(--spacing-md);
}

.note {
    background-color: var(--color-warning-bg);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-left: 3px solid #ff9800;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.important-note {
    background-color: var(--color-warning-bg);
    padding: var(--spacing-sm);
    border: 1px dashed #ff9800;
    border-radius: var(--border-radius);
    margin: var(--spacing-sm) 0;
}

/* ============================================
   Ressourcen-Karten
   ============================================ */
.resource-card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.resource-card h2 {
    font-size: 1.05rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
}

.resource-list {
    margin-left: var(--spacing-md);
    list-style-type: disc;
}

.link-list {
    margin-left: var(--spacing-md);
    list-style-type: none;
}

.link-list li::before {
    content: "→ ";
    color: var(--color-primary);
    font-weight: bold;
}

/* ============================================
   Feature-Bilder
   ============================================ */
.profile-image {
    float: left;
    width: 180px;
    height: auto;
    margin: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 0;
    border-radius: var(--border-radius);
}

.department-logo {
    float: right;
    width: 100px;
    height: auto;
    margin: var(--spacing-sm);
}

.feature-image-right {
    float: right;
    width: 260px;
    height: auto;
    margin: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* ============================================
   Publikationen
   ============================================ */
.publication-card {
    background-color: var(--color-background);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.publication-card h2 {
    font-size: 1.1rem;
    border-bottom: none;
}

.publication-item {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.publication-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

/* ============================================
   Highlight-Box
   ============================================ */
.highlight-box {
    background-color: var(--color-warning-bg);
    border-left: 4px solid #ff9800;
    padding: var(--spacing-md);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    margin: var(--spacing-sm) 0;
}

/* ============================================
   Responsive Anpassungen
   ============================================ */
@media (max-width: 767px) {
    .profile-image,
    .department-logo,
    .feature-image-right {
        float: none;
        display: block;
        margin: var(--spacing-sm) auto var(--spacing-md);
        max-width: 100%;
    }
    
    .main-nav ul {
        flex-direction: column;
    }
    
    .main-nav .nav-link {
        padding: 0.4rem;  /* Von 1rem auf 0.5rem reduziert */
        text-align: left;
    }
}

/* ============================================
   Scroll-to-Top Button
   ============================================ */
#up {
    position: fixed;
    bottom: 80px;
    right: 10px;
    padding: var(--spacing-sm);
    border: 2px solid darkgrey;
    background-color: rgba(225, 232, 240, 0.9);
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    text-decoration: none;
    color: var(--color-text);
    border-radius: var(--border-radius);
    opacity: 0.7;
    transition: all 0.3s ease;
}

#up:hover,
#up:focus {
    opacity: 1;
    background-color: #6ed3cf;
    transform: translateY(-2px);
}

/* ============================================
   Druck-Stil
   ============================================ */
@media print {
    .main-nav,
    #up {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    a {
        text-decoration: underline;
    }
    
    .module-card,
    .contact-block,
    .resource-card,
    .publication-card {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}