/* ============================================================================
   ROBERT KOCHINSTITUT - MAIN STYLESHEET
   Design: Warm, Editorial, Professional
   ============================================================================ */

/* === CSS VARIABLES === */
:root {
    /* Color Palette - Warm Koch-Ästhetik */
    --color-primary: #D35400;        /* Warmes Orange (Rezeptbuch) */
    --color-primary-dark: #A04000;
    --color-primary-light: #E67E22;
    
    --color-secondary: #1A5490;      /* Tiefblau (Lehrbuch) */
    --color-secondary-dark: #0D3A6F;
    --color-secondary-light: #2E6DB5;
    
    --color-accent: #27AE60;         /* Frisches Grün (Lernen) */
    --color-accent-dark: #1E8449;
    
    --color-dark: #2C3E50;
    --color-text: #34495E;
    --color-text-light: #7F8C8D;
    --color-border: #E0E4E8;
    --color-bg: #FDFAF7;
    --color-bg-alt: #F8F5F2;
    --color-white: #FFFFFF;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Lora', Georgia, serif;
    --font-ui: 'Lexend', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Layout */
    --container-width: 1280px;
    --header-height: 80px;
    --nav-height: 60px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* === RESET & BASE STYLES === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

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

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.35rem; }

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

a:hover {
    color: var(--color-primary-dark);
}

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

button {
    font-family: var(--font-ui);
    cursor: pointer;
    border: none;
    background: none;
}

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

.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--color-dark);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 10000;
    transition: top var(--transition-fast);
}

.skip-to-content:focus {
    top: 0;
}

/* === SITE HEADER === */
.site-header {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

/* Header Top */
.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

/* Logo */
.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.site-logo:hover {
    transform: translateY(-2px);
}

.logo-icon {
    font-size: 2.5rem;
    line-height: 1;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    line-height: 1;
}

.logo-tagline {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    transition: all var(--transition-fast);
    position: relative;
}

.header-btn:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary);
}

.favorites-count {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--color-primary);
    color: white;
    font-size: 0.65rem;
    font-family: var(--font-ui);
    font-weight: 600;
    padding: 2px 5px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-dark);
    transition: all var(--transition-fast);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* === MAIN NAVIGATION === */
.main-nav {
    padding: 0;
}

.nav-menu {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: var(--spacing-md) var(--spacing-sm);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link svg {
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.nav-link:hover {
    background: var(--color-bg-alt);
    color: var(--color-dark);
}

.nav-link:hover svg {
    opacity: 1;
}

/* Color-coded nav items */
.nav-link[data-category="lehrbuch"]:hover {
    color: var(--color-secondary);
    background: rgba(26, 84, 144, 0.08);
}

.nav-link[data-category="rezeptbuch"]:hover {
    color: var(--color-primary);
    background: rgba(211, 84, 0, 0.08);
}

.nav-link[data-category="lernen"]:hover {
    color: var(--color-accent);
    background: rgba(39, 174, 96, 0.08);
}

.dropdown-arrow {
    transition: transform var(--transition-fast);
}

.nav-item:hover .dropdown-arrow {
    transform: rotate(180deg);
}

/* === MEGA MENU === */
.mega-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100vw;
    max-width: 1200px;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: 100;
    margin-top: var(--spacing-xs);
}

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

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

.mega-menu-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.mega-menu-header h3 {
    font-size: 1.5rem;
    color: var(--color-dark);
    margin-bottom: var(--spacing-xs);
}

.mega-menu-header p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.mega-menu-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.mega-menu-column h4 {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 8px;
}

.mega-menu-column h4 svg {
    opacity: 0.6;
}

.mega-menu-column ul {
    list-style: none;
}

.mega-menu-column ul li {
    margin-bottom: 10px;
}

.mega-menu-column ul li a {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    color: var(--color-text);
    transition: all var(--transition-fast);
    display: inline-block;
    padding: 4px 0;
}

.mega-menu-column ul li a:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* Color-coded mega menus */
.nav-item:nth-child(2) .mega-menu-header {
    border-color: var(--color-secondary);
}

.nav-item:nth-child(2) .mega-menu-column h4 {
    color: var(--color-secondary);
}

.nav-item:nth-child(3) .mega-menu-header {
    border-color: var(--color-primary);
}

.nav-item:nth-child(3) .mega-menu-column h4 {
    color: var(--color-primary);
}

/* === SEARCH OVERLAY === */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(44, 62, 80, 0.95);
    backdrop-filter: blur(10px);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    width: 100%;
    max-width: 800px;
    position: relative;
}

.search-close {
    position: absolute;
    top: -60px;
    right: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.search-close:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(90deg);
}

.search-form {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.search-input-wrapper {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-light);
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 56px;
    font-family: var(--font-ui);
    font-size: 1.25rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.search-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

.filter-chip input {
    display: none;
}

.filter-chip span {
    padding: 8px 16px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.filter-chip:hover span {
    border-color: var(--color-primary);
}

.filter-chip input:checked + span {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.search-submit {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-primary);
    color: white;
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.search-submit:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.search-suggestions h4 {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.suggestion-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.suggestion-tag {
    padding: 6px 14px;
    background: var(--color-bg);
    border-radius: 16px;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.suggestion-tag:hover {
    background: var(--color-primary);
    color: white;
}

/* === BREADCRUMB NAVIGATION === */
.breadcrumb-nav {
    background: var(--color-bg-alt);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-ui);
    font-size: 0.85rem;
}

.breadcrumb-item:not(:last-child)::after {
    content: '›';
    color: var(--color-text-light);
    margin-left: var(--spacing-xs);
}

.breadcrumb-item a {
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
    color: var(--color-primary);
}

.breadcrumb-item.active {
    color: var(--color-text-light);
}

/* === MAIN CONTENT === */
main {
    min-height: 60vh;
    padding: var(--spacing-xl) 0;
}

/* === FOOTER === */
.site-footer {
    background: var(--color-dark);
    color: rgba(255, 255, 255, 0.8);
    margin-top: var(--spacing-xxl);
}

.footer-top {
    padding: var(--spacing-xxl) 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.footer-logo .logo-icon {
    font-size: 2rem;
}

.footer-logo .logo-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: white;
}

.footer-description {
    font-size: 0.95rem;
    line-height: 1.6;
    opacity: 0.8;
}

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

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--color-primary);
    transform: translateY(-3px);
}

.footer-heading {
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
    display: inline-block;
}

.footer-links a:hover {
    color: white;
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg) 0;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.copyright {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    opacity: 0.7;
}

.footer-legal {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

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

/* === BACK TO TOP BUTTON === */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 900;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
    .mega-menu-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    /* Mobile Menu */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background: white;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        overflow-y: auto;
        box-shadow: var(--shadow-lg);
    }
    
    .main-nav.active {
        transform: translateX(0);
    }
    
    .nav-menu {
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-link {
        width: 100%;
        padding: var(--spacing-md);
        justify-content: space-between;
    }
    
    /* Mobile Mega Menu */
    .mega-menu {
        position: static;
        width: 100%;
        box-shadow: none;
        border-radius: 0;
        max-height: 0;
        overflow: hidden;
        background: var(--color-bg-alt);
    }
    
    .nav-item.active .mega-menu {
        max-height: 2000px;
        opacity: 1;
        visibility: visible;
        transform: none;
    }
    
    .mega-menu-container {
        padding: var(--spacing-md);
    }
    
    .mega-menu-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
    
    /* Typography */
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.35rem; }
}

@media (max-width: 480px) {
    .logo-name {
        font-size: 1.25rem;
    }
    
    .logo-tagline {
        font-size: 0.7rem;
    }
    
    .search-input {
        font-size: 1rem;
        padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 48px;
    }
    
    .search-form {
        padding: var(--spacing-md);
    }
}

/* === ANIMATIONS === */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.animate-slide-in {
    animation: slideInRight 0.6s ease forwards;
}
/* === GLOSSAR-SPEZIFISCHE STYLES === */
/* Trennlinie vor Buchstaben (außer A) */
.glossar-letter-separator {
    width: 80%;
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-lg) auto;
    opacity: 0.5;
}

/* Umrahmung für Glossar-Karten */
.glossar-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-md);
}

.glossar-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.glossar-card .featured-content {
    padding: var(--spacing-lg);
}