/* ============================================
   The Nordic Observer
   Independent investigative journalism platform
   ============================================ */

/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    /* Typography */
    --font-serif: 'Crimson Pro', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    
    /* Colors - Institutional Authority Palette */
    --color-primary: #1a1a1a;
    --color-secondary: #2d2d2d;
    --color-accent: #0a5078;
    --color-accent-hover: #083d5c;
    --color-text: #1a1a1a;
    --color-text-light: #4a4a4a;
    --color-text-muted: #767676;
    --color-background: #ffffff;
    --color-background-alt: #f7f8fa;
    --color-border: #d8dce6;
    --color-overlay: rgba(0, 0, 0, 0.85);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Layout */
    --max-width: 1400px;
    --content-width: 760px;
    --nav-height: 70px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Navigation
   ============================================ */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--color-primary);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    transition: var(--transition);
}

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

.brand-icon {
    font-size: 0.875rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    background-color: var(--color-accent);
    color: white;
    padding: 0.375rem 0.5rem;
    border-radius: 3px;
    font-family: var(--font-sans);
}

.brand-text {
    font-family: var(--font-display);
}

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

.nav-link {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-light);
    text-decoration: none;
    position: relative;
    transition: var(--transition);
    letter-spacing: -0.01em;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-accent);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-primary);
    cursor: pointer;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    margin-top: var(--nav-height);
    background: linear-gradient(135deg, #0a5078 0%, #083d5c 100%);
    color: white;
    padding: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
    border-bottom: 3px solid var(--color-accent);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.hero-tagline {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: #ffffff;
    opacity: 0.8;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1.125rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.95);
    max-width: 100%;
}

.hero-description br {
    display: block;
    content: "";
    margin-top: 1rem;
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

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

/* ============================================
   Featured Article
   ============================================ */
.featured-section {
    margin-bottom: var(--spacing-3xl);
}

.featured-article {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    background-color: var(--color-background-alt);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: var(--transition);
}

.featured-article:hover {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

.featured-image {
    position: relative;
    overflow: hidden;
    background-color: var(--color-secondary);
    min-height: 500px;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.featured-article:hover .featured-image img {
    transform: scale(1.05);
}

.featured-content {
    padding: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-meta {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.featured-label {
    background-color: var(--color-accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 2px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
}

.featured-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.featured-title a {
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition);
}

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

.featured-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.featured-excerpt {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

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

.article-tag {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    background-color: white;
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: var(--transition);
}

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

.read-more-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
}

.read-more-btn:hover {
    color: var(--color-accent-hover);
    gap: var(--spacing-sm);
}

/* ============================================
   Articles Section
   ============================================ */
.articles-section {
    margin-top: var(--spacing-3xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-primary);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.tag-filter {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    background-color: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.tag-filter:hover,
.tag-filter.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.article-card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.article-card-image {
    position: relative;
    height: 240px;
    overflow: hidden;
    background-color: var(--color-secondary);
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.article-card:hover .article-card-image img {
    transform: scale(1.08);
}

.article-card-content {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card-meta {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.article-card-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.article-card-title a {
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition);
}

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

.article-card-excerpt {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.article-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.article-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.article-card-tag {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    background-color: var(--color-background-alt);
    padding: 0.25rem 0.625rem;
    border-radius: 12px;
    text-decoration: none;
    transition: var(--transition);
}

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

/* ============================================
   Loading & Empty States
   ============================================ */
.loading-spinner {
    text-align: center;
    padding: var(--spacing-3xl) 0;
    font-size: 2rem;
    color: var(--color-accent);
}

.no-articles {
    text-align: center;
    padding: var(--spacing-3xl) 0;
    color: var(--color-text-muted);
}

.no-articles i {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.3;
}

.no-articles a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
}

.no-articles a:hover {
    text-decoration: underline;
}

/* ============================================
   Footer
   ============================================ */
.main-footer {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1rem;
}

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

.footer-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    transition: var(--transition);
}

.footer-link:hover {
    color: white;
}

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

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

.social-link:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-family: var(--font-sans);
    font-size: 0.875rem;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .featured-article {
        grid-template-columns: 1fr;
    }
    
    .featured-image {
        min-height: 400px;
    }
    
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-content {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
        --spacing-3xl: 3rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .footer-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .brand-text {
        font-size: 1rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .featured-content {
        padding: var(--spacing-lg);
    }
}