/* ============================================
           CSS RESET & BASE STYLES
           ============================================ */

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

:root {
    /* Dark Theme Color Palette */
    --primary-color: #00d4ff;
    --primary-dark: #00a8cc;
    --primary-light: #33ddff;
    --secondary-color: #7b2cbf;
    --accent-color: #ff006e;
    --dark-bg: #0a0a0a;
    --dark-bg-alt: #121212;
    --dark-bg-card: #1a1a1a;
    --dark-bg-elevated: #242424;
    --light-accent: #2a2a2a;
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --border-color: #333333;
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.7);
    --glow-primary: 0 0 20px rgba(0, 212, 255, 0.3);
    --glow-accent: 0 0 20px rgba(255, 0, 110, 0.3);

    /* Typography */
    --font-sans: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-serif: Georgia, 'Times New Roman', Times, serif;

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

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
    /* Improve mobile scrolling performance */
    -webkit-overflow-scrolling: touch;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--dark-bg);
    overflow-x: hidden;
    /* Improve scroll performance on mobile */
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
}

p, li {
    font-family: var(--font-serif);
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

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

.container-article {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   HEADER
   ============================================ */

.header {
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    padding: var(--spacing-md) 0;
    box-shadow: 0 2px 20px rgba(0, 212, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: padding var(--transition-normal),
    background-color var(--transition-normal),
    box-shadow var(--transition-normal);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
}

.header.scrolled {
    padding: var(--spacing-sm) 0;
    background-color: rgba(18, 18, 18, 0.98);
    box-shadow: 0 4px 30px rgba(0, 212, 255, 0.2);
    border-bottom: 1px solid rgba(0, 212, 255, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
}

.logo {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

.header.scrolled .logo {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.75rem;
    transition: all var(--transition-normal);
    box-shadow: var(--glow-primary);
}

.header.scrolled .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
    border-radius: 8px;
}

.back-link {
    color: var(--primary-color);
    text-decoration: none;
    font-family: var(--font-sans);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.back-link:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--primary-color);
    transform: translateX(-5px);
}

/* ============================================
   ARTICLE HERO
   ============================================ */

.article-hero {
    background: linear-gradient(135deg, var(--dark-bg-alt) 0%, var(--dark-bg) 100%);
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
    position: relative;
    overflow: hidden;
}

.article-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at top, rgba(0, 212, 255, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.article-hero-content {
    position: relative;
    z-index: 1;
}

.article-category {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--dark-bg);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-title {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    color: var(--text-secondary);
    font-size: 1rem;
    font-family: var(--font-sans);
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-featured-image {
    width: 100%;
    height: 400px;
    background-size: cover;
    background-position: center;
    border-radius: 16px;
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.article-featured-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(10, 10, 10, 0.5) 100%);
}

/* ============================================
   ARTICLE CONTENT
   ============================================ */

.article-body {
    padding: var(--spacing-xl) 0;
}

.article-content {
    background: var(--dark-bg-card);
    padding: var(--spacing-lg);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.article-content h2 {
    color: var(--primary-color);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.article-content h3 {
    color: var(--primary-light);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

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

.article-content ul,
.article-content ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.article-content li {
    margin-bottom: var(--spacing-xs);
}

.article-content blockquote {
    background: rgba(0, 212, 255, 0.05);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: 8px;
    font-style: italic;
    color: var(--text-primary);
}

.article-content code {
    background: var(--dark-bg-elevated);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--primary-light);
}

.highlight-box {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(123, 44, 191, 0.1));
    border: 1px solid var(--primary-color);
    padding: var(--spacing-md);
    border-radius: 12px;
    margin: var(--spacing-md) 0;
}

.highlight-box h3 {
    color: var(--primary-color);
    margin-top: 0;
}

/* ============================================
   RELATED ARTICLES
   ============================================ */

.related-articles {
    background: var(--dark-bg-alt);
    padding: var(--spacing-xl) 0;
}

.related-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.related-header h2 {
    color: var(--primary-color);
    position: relative;
    display: inline-block;
    padding-bottom: var(--spacing-sm);
}

.related-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.related-card {
    background: var(--dark-bg-card);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-primary);
}

.related-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), var(--glow-primary);
    border-color: var(--primary-color);
}

.related-card-image {
    width: 100%;
    height: 180px;
    background-size: cover;
    background-position: center;
}

.related-card-content {
    padding: var(--spacing-md);
}

.related-card h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.related-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background-color: var(--dark-bg-card);
    color: var(--text-primary);
    padding: var(--spacing-lg) 0 var(--spacing-md) 0;
    border-top: 1px solid var(--border-color);
}

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

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

.footer-logo:hover {
    color: var(--primary-color);
    filter: drop-shadow(var(--glow-primary));
}

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

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.footer-links a:hover::after,
.footer-links a:focus::after {
    width: 100%;
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    :root {
        --spacing-xl: 2.5rem;
        --spacing-lg: 2rem;
    }

    .article-featured-image {
        height: 250px;
    }

    .article-content {
        padding: var(--spacing-md);
    }

    .related-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    border-radius: 6px;
    border: 2px solid var(--dark-bg);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--primary-light), var(--primary-color));
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--dark-bg);
}