/* 
 * Viral News Hub - Main Stylesheet
 * Mediumish-inspired modern blog theme
 */

/* ==================== CSS Variables ==================== */
:root {
    /* Colors - Light Theme */
    --color-primary: #0066FF;
    --color-primary-dark: #0052CC;
    --color-secondary: #FF6B6B;
    --color-accent: #4ECDC4;

    --color-bg: #FFFFFF;
    --color-bg-secondary: #F8F9FA;
    --color-bg-tertiary: #F1F3F5;

    --color-text: #1A1A1A;
    --color-text-secondary: #6C757D;
    --color-text-tertiary: #ADB5BD;

    --color-border: #DEE2E6;
    --color-border-light: #E9ECEF;

    --color-success: #51CF66;
    --color-warning: #FFD43B;
    --color-error: #FF6B6B;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Layout */
    --container-max-width: 1200px;
    --container-narrow-max-width: 800px;
    --navbar-height: 70px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg: #0D1117;
    --color-bg-secondary: #161B22;
    --color-bg-tertiary: #21262D;

    --color-text: #E6EDF3;
    --color-text-secondary: #8B949E;
    --color-text-tertiary: #6E7681;

    --color-border: #30363D;
    --color-border-light: #21262D;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

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

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

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

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

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

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

.container-narrow {
    max-width: var(--container-narrow-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ==================== Navigation ==================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
    transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
    background-color: rgba(13, 17, 23, 0.95);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--navbar-height);
    gap: var(--spacing-xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.logo:hover .logo-icon {
    transform: rotate(-10deg);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    flex: 1;
    justify-content: center;
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-fast);
}

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

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-bg-tertiary);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--color-text);
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

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

/* ==================== Article Header ==================== */
.article-header {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.category-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast);
}

.category-badge:hover {
    transform: translateY(-2px);
}

.article-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.article-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-text), var(--color-text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-author {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.author-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-details {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    color: var(--color-text);
}

.reading-time {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.article-share {
    display: flex;
    gap: var(--spacing-sm);
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.share-btn:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* ==================== Featured Image ==================== */
.featured-image {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto var(--spacing-3xl);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.featured-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ==================== Article Content ==================== */
.article-content {
    padding: var(--spacing-2xl) 0;
}

.article-content h2 {
    margin-top: var(--spacing-3xl);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-3xl);
    border-bottom: 2px solid var(--color-bg-secondary);
    padding-bottom: var(--spacing-sm);
}

.article-content h3 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-2xl);
}

.article-content p {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.article-content ul,
.article-content ol {
    margin-bottom: var(--spacing-xl);
    padding-left: var(--spacing-xl);
}

.article-content li {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
    line-height: 1.8;
}

.article-content strong {
    font-weight: 600;
    color: var(--color-text);
}

.article-content em {
    font-style: italic;
}

.article-content blockquote {
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-xl);
    border-left: 4px solid var(--color-primary);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xl);
    font-style: italic;
}

/* ==================== Article Footer ==================== */
.article-footer {
    padding: var(--spacing-3xl) 0;
    border-top: 2px solid var(--color-border);
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.tag {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

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

.article-share-footer {
    text-align: center;
}

.share-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.share-btn-large {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.share-btn-large.facebook {
    background: #1877F2;
    color: white;
}

.share-btn-large.twitter {
    background: #1DA1F2;
    color: white;
}

.share-btn-large.whatsapp {
    background: #25D366;
    color: white;
}

.share-btn-large:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ==================== Related Articles ==================== */
.related-articles {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

/* ==================== Footer ==================== */
.site-footer {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: var(--color-text-secondary);
}

.footer-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

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

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-links-bottom {
    display: flex;
    gap: var(--spacing-lg);
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
    }

    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .article-title {
        font-size: var(--font-size-4xl);
    }

    .article-author {
        flex-direction: column;
        gap: var(--spacing-lg);
        align-items: flex-start;
    }

    .share-buttons {
        flex-direction: column;
        width: 100%;
    }

    .share-btn-large {
        width: 100%;
        justify-content: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.article-content>* {
    animation: fadeIn 0.6s ease-out;
}