/* ============================================
   VIPKOLUMNE - Premium Magazine Design System
   ============================================ */

/* === CSS Variables - Premium Color Palette === */
:root {
    /* Primary Colors - Deep Elegant Tones */
    --primary: #1a1a1a;
    --primary-dark: #0d0d0d;
    --primary-light: #2d2d2d;
    
    /* Accent Colors - Luxury Gold & Rich Tones */
    --accent: #d4af37;
    --accent-dark: #b8941f;
    --accent-light: #e8d5a3;
    
    /* Secondary Colors - Sophisticated Palette */
    --secondary: #2c3e50;
    --secondary-light: #34495e;
    
    /* Neutral Colors - Premium Grays */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-tertiary: #6c757d;
    --text-light: #ffffff;
    
    /* Border & Shadow */
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
    
    /* Spacing Scale */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

/* === Base Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h5 {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
}

h6 {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

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

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

/* === Header / Navigation === */
.header {
    background: var(--primary);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header .navbar {
    padding: 0;
}

.brand {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 700;
    color: var(--text-light);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: color var(--transition-base);
    display: inline-block;
    position: relative;
}

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

.brand::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-base);
}

.brand:hover::after {
    width: 100%;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    font-size: 0.9375rem;
    padding: var(--spacing-xs) var(--spacing-sm) !important;
    margin: 0 var(--spacing-xs);
    position: relative;
    transition: color var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--accent) !important;
}

.nav-link:hover::before {
    width: calc(100% - 1rem);
}

.navbar-toggler {
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.5rem;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* === Hero Section === */
.hero-large {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    background: var(--primary);
}

.hero-large img {
    width: 100%;
    height: clamp(400px, 60vh, 600px);
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
}

.hero-large:hover img {
    transform: scale(1.05);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(0, 0, 0, 0) 0%,
        rgba(0, 0, 0, 0.3) 50%,
        rgba(0, 0, 0, 0.85) 100%
    );
    display: flex;
    align-items: flex-end;
    padding: clamp(2rem, 5vw, 4rem);
    z-index: 2;
}

.hero-overlay > div {
    max-width: 800px;
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-overlay h1 {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.hero-overlay p {
    color: rgba(255, 255, 255, 0.95);
    font-size: clamp(1rem, 2vw, 1.125rem);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.hero-overlay .btn {
    background: var(--accent);
    color: var(--primary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.9375rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    display: inline-block;
}

.hero-overlay .btn:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--primary);
}

/* === Category Pill === */
.category-pill {
    display: inline-block;
    background: var(--accent);
    color: var(--primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.category-pill:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* === Post Cards Grid === */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.post-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.post-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent);
}

.post-card img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
}

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

.post-card-body {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.post-card-body h5 {
    margin: var(--spacing-sm) 0;
    font-size: clamp(1.125rem, 2vw, 1.25rem);
}

.post-card-body h5 a {
    color: var(--text-primary);
    transition: color var(--transition-base);
    display: block;
}

.post-card-body h5 a:hover {
    color: var(--accent);
}

.post-card-body p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
    flex-grow: 1;
}

/* === Sidebar === */
.sidebar {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    position: sticky;
    top: calc(var(--spacing-sm) + 60px);
}

.sidebar h6 {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--accent);
}

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

.sidebar ul li {
    margin-bottom: var(--spacing-sm);
}

.sidebar ul li a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: all var(--transition-base);
    display: block;
    padding: var(--spacing-xs) 0;
    position: relative;
    padding-left: var(--spacing-md);
}

.sidebar ul li a::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    transition: transform var(--transition-base);
}

.sidebar ul li a:hover {
    color: var(--accent);
    padding-left: var(--spacing-lg);
}

.sidebar ul li a:hover::before {
    transform: translateX(4px);
}

/* === Article Hero (Article Pages) === */
.article-hero {
    height: clamp(400px, 50vh, 500px);
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
}

.article-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.article-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(0, 0, 0, 0.1) 0%,
        rgba(0, 0, 0, 0.3) 50%,
        rgba(0, 0, 0, 0.7) 100%
    );
    z-index: 1;
}

.article-hero-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    color: var(--text-light);
    z-index: 2;
    padding: var(--spacing-xl);
    max-width: 900px;
}

.article-hero-content h1 {
    color: var(--text-light);
    margin-top: var(--spacing-sm);
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.article-meta {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: var(--spacing-sm);
    font-weight: 500;
}

/* === Article Wrapper === */
.article-wrapper {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: clamp(2rem, 5vw, 4rem);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-2xl);
}

.article-wrapper p {
    font-size: clamp(1rem, 2vw, 1.125rem);
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.article-wrapper h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    border-left: 4px solid var(--accent);
    padding-left: var(--spacing-md);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.article-wrapper h3 {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.section-divider {
    height: 3px;
    width: 80px;
    background: linear-gradient(90deg, var(--accent), transparent);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-full);
}

.tag {
    background: var(--bg-tertiary);
    color: var(--primary);
    font-size: 0.8125rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-weight: 600;
    display: inline-block;
    margin-right: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    transition: all var(--transition-base);
}

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

/* === Footer === */
.footer {
    background: var(--primary);
    color: var(--text-light);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer h5 {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.footer h6 {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: var(--spacing-md);
}

.footer p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all var(--transition-base);
    font-size: 0.9375rem;
}

.footer a:hover {
    color: var(--accent);
    padding-left: var(--spacing-xs);
}

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

.footer ul li {
    margin-bottom: var(--spacing-sm);
}

.footer hr {
    border-color: rgba(255, 255, 255, 0.1);
    margin: var(--spacing-xl) 0;
    opacity: 1;
}

.footer .text-center {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    padding-top: var(--spacing-md);
}

/* === Back to Top Button === */
.back-to-top {
    position: fixed;
    right: var(--spacing-md);
    bottom: var(--spacing-md);
    width: 50px;
    height: 50px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-full);
    color: var(--primary);
    font-size: 1.25rem;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

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

.back-to-top:hover {
    background: var(--accent-dark);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.back-to-top:active {
    transform: translateY(-2px);
}

/* === Utility Classes === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* === Responsive Design (Mobile-First) === */
@media (max-width: 767.98px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }
    
    .hero-overlay {
        padding: var(--spacing-lg);
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .article-wrapper {
        padding: var(--spacing-lg);
    }
    
    .sidebar {
        position: static;
        margin-top: var(--spacing-lg);
    }
    
    .back-to-top {
        width: 44px;
        height: 44px;
        right: var(--spacing-sm);
        bottom: var(--spacing-sm);
    }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    .posts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* === Print Styles === */
@media print {
    .header,
    .footer,
    .back-to-top,
    .sidebar {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}