/* CSS Design System for Opel Stadt News - Entdecke Rüsselsheim */

/* ==========================================================================
   0. Lokale Google Fonts - DSGVO-konform
   ========================================================================== */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300;
    font-display: swap;
    src: url('fonts/inter-300-normal-latin.woff2') format('woff2');
}
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('fonts/inter-400-normal-latin.woff2') format('woff2');
}
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url('fonts/inter-500-normal-latin.woff2') format('woff2');
}
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('fonts/inter-600-normal-latin.woff2') format('woff2');
}
@font-face {
    font-family: 'Outfit';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('fonts/outfit-400-normal-latin.woff2') format('woff2');
}
@font-face {
    font-family: 'Outfit';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('fonts/outfit-600-normal-latin.woff2') format('woff2');
}
@font-face {
    font-family: 'Outfit';
    font-style: normal;
    font-weight: 800;
    font-display: swap;
    src: url('fonts/outfit-800-normal-latin.woff2') format('woff2');
}

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */
:root {
    /* Brand Accent: Opel Yellow/Gold */
    --accent-base: #eab308;       /* Amber 500 */
    --accent-hover: #ca8a04;      /* Amber 600 */
    --accent-light: #fef08a;      /* Amber 200 */
    --accent-glow: rgba(234, 179, 8, 0.15);

    /* Layout & Border-Radius */
    --max-width: 1200px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;

    /* Fonts */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: 'Outfit', var(--font-sans);

    /* Standard transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme (Standard) */
html.dark {
    --bg-primary: #0f172a;       /* Slate 900 */
    --bg-secondary: #1e293b;     /* Slate 800 */
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-card-hover: rgba(51, 65, 85, 0.8);
    --text-primary: #f8fafc;     /* Slate 50 */
    --text-secondary: #cbd5e1;   /* Slate 300 */
    --text-muted: #64748b;       /* Slate 500 */
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-hover: rgba(255, 255, 255, 0.15);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --glow-opacity: 0.35;
    
    /* Category Colors for News Badge */
    --tag-politics: #ef4444;     /* Red */
    --tag-economy: #3b82f6;      /* Blue */
    --tag-research: #10b981;     /* Green */
    --tag-culture: #a855f7;      /* Purple */
}

/* Light Theme */
html.light {
    --bg-primary: #f8fafc;       /* Slate 50 */
    --bg-secondary: #ffffff;     /* Reinweiß */
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --text-primary: #0f172a;     /* Slate 900 */
    --text-secondary: #475569;   /* Slate 600 */
    --text-muted: #94a3b8;       /* Slate 400 */
    --border-color: rgba(15, 23, 42, 0.08);
    --border-color-hover: rgba(15, 23, 42, 0.15);
    --shadow: 0 4px 6px -1px rgb(15 23 42 / 0.05);
    --glow-opacity: 0.1;

    /* Category Colors Light Mode */
    --tag-politics: #dc2626;     /* Red 600 */
    --tag-economy: #2563eb;      /* Blue 600 */
    --tag-research: #059669;     /* Green 600 */
    --tag-culture: #7c3aed;      /* Purple 600 */
}

/* ==========================================================================
   2. Reset & General Styles
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition), color var(--transition);
    min-height: 100vh;
}

/* Links & Buttons */
a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

a.text-link {
    color: var(--accent-base);
    text-decoration: underline;
}

a.text-link:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

p {
    color: var(--text-secondary);
}

/* ==========================================================================
   3. Ambient Decorative Layouts (Glows)
   ========================================================================== */
.glow-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: var(--glow-opacity);
    transition: opacity var(--transition);
}

.glow-1 {
    top: -10%;
    right: 15%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, var(--accent-base) 0%, transparent 70%);
}

.glow-2 {
    bottom: 10%;
    left: -5%;
    width: 45vw;
    height: 45vw;
    background: radial-gradient(circle, #f59e0b 0%, transparent 70%);
}

/* ==========================================================================
   4. Common Layout Utilities
   ========================================================================== */
.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

.section-padding {
    padding: 80px 0;
}

.section-border-top {
    border-top: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 48px auto;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
        align-items: center;
    }
}

.grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 640px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Cards (Glassmorphism) */
.card-glass {
    background-color: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card-glass::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--accent-base), #f59e0b);
    opacity: 0;
    transition: opacity var(--transition);
}

.card-glass.hover-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-color-hover);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), var(--shadow);
}

.card-glass.hover-card:hover::after {
    opacity: 1;
}

/* ==========================================================================
   5. Buttons
   ========================================================================== */
.btn-primary, .btn-secondary, .btn-primary-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background-color: var(--accent-base);
    color: #0f172a !important; /* Immer lesbar */
    padding: 12px 24px;
    font-size: 1rem;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--accent-glow);
}

.btn-primary-sm {
    background-color: var(--accent-base);
    color: #0f172a !important;
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-primary-sm:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 12px 24px;
    font-size: 1rem;
}

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

/* ==========================================================================
   6. Navigation Header
   ========================================================================== */
.main-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: var(--bg-primary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition), border-color var(--transition);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.3rem;
}

.logo-accent {
    color: var(--accent-base);
}

.nav-menu {
    display: none; /* Mobil standardmäßig versteckt */
    gap: 24px;
    align-items: center;
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-base);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Theme Toggle Button */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    transition: var(--transition);
}

.theme-toggle:hover {
    border-color: var(--border-color-hover);
}

/* Icons Hide/Show */
html.dark .sun-icon { display: block; }
html.dark .moon-icon { display: none; }
html.light .sun-icon { display: none; }
html.light .moon-icon { display: block; }

/* Mobile Menu Toggle */
.mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

@media (min-width: 768px) {
    .mobile-nav-toggle {
        display: none;
    }
}

.mobile-nav-toggle .close-icon {
    display: none;
}

.mobile-nav-toggle.open .open-icon {
    display: none;
}

.mobile-nav-toggle.open .close-icon {
    display: block;
}

/* Mobile Nav Styles */
.mobile-menu-active {
    display: flex !important;
    flex-direction: column;
    position: absolute;
    top: 73px;
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    z-index: 99;
}

/* ==========================================================================
   7. Hero Section
   ========================================================================== */
.hero-section {
    position: relative;
    padding: 100px 0 60px 0;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 800px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--accent-base);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-base);
    border-radius: 50%;
    position: relative;
}

.pulse-dot::after {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    border-radius: 50%;
    background-color: var(--accent-base);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(2.5); opacity: 0; }
}

.hero-title {
    font-size: 2.75rem;
    line-height: 1.15;
    margin-bottom: 20px;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 3.5rem;
    }
}

.text-gradient {
    background: linear-gradient(to right, var(--accent-base), #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    margin-bottom: 32px;
}

.hero-ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

/* ==========================================================================
   8. Search & Filter Bar
   ========================================================================== */
.filter-container {
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

@media (min-width: 768px) {
    .filter-container {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.search-wrapper {
    position: relative;
    max-width: 400px;
    width: 100%;
}

.search-input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-base);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    padding: 8px 16px;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
    color: #0f172a;
    background-color: var(--accent-base);
    border-color: var(--accent-base);
}

/* ==========================================================================
   9. News Article Cards
   ========================================================================== */
.card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
}

.category-tag {
    padding: 2px 10px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: #fff !important;
}

.category-tag.politik { background-color: var(--tag-politics); }
.category-tag.wirtschaft { background-color: var(--tag-economy); }
.category-tag.forschung { background-color: var(--tag-research); }
.category-tag.kultur { background-color: var(--tag-culture); }
.category-tag.stadtleben { background-color: var(--tag-culture); }

.card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
}

.card-title a:hover {
    color: var(--accent-base);
}

.card-text {
    font-size: 0.95rem;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-base);
}

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

.card-link svg {
    transition: transform var(--transition);
}

.card-glass:hover .card-link svg {
    transform: translateX(4px);
}

/* ==========================================================================
   10. Detail Article View Styles
   ========================================================================== */
.article-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px auto;
}

.article-headline {
    font-size: 2.5rem;
    font-weight: 800;
    margin: 20px 0;
}

@media (min-width: 768px) {
    .article-headline {
        font-size: 3.25rem;
    }
}

.article-content {
    max-width: 750px;
    margin: 0 auto;
}

.article-content p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.article-content h2 {
    font-size: 1.75rem;
    margin: 40px 0 20px 0;
}

.article-content h3 {
    font-size: 1.4rem;
    margin: 30px 0 16px 0;
}

.article-content h4 {
    font-size: 1.2rem;
    margin: 24px 0 12px 0;
}

.article-content ul, .article-content ol {
    margin-bottom: 24px;
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content li strong {
    color: var(--text-primary);
}

.article-content blockquote {
    border-left: 4px solid var(--accent-base);
    padding: 10px 20px;
    margin: 20px 0;
    background-color: var(--bg-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
}

.article-content pre {
    background-color: var(--bg-secondary);
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin-bottom: 24px;
}

.article-content code {
    font-family: monospace;
    font-size: 0.95rem;
}

/* ==========================================================================
   11. Footer
   ========================================================================== */
.main-footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

@media (min-width: 768px) {
    .footer-container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.footer-nav {
    display: flex;
    gap: 20px;
}

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