:root {
    --primary-cyan: #00d4ff;
    --primary-purple: #7c3aed;
    --gradient-start: #00d4ff;
    --gradient-end: #7c3aed;
    --dark-bg: #0f0f23;
    --light-bg: #1a1a2e;
    --text-primary: #ffffff;
    --text-secondary: #b8b8d1;
    --accent: #00d4ff;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.8;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
}

.logo span {
    color: var(--dark-bg);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.8;
}

/* Article Header */
.article-header {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    padding: 4rem 0;
    text-align: center;
}

.article-header h1 {
    font-size: 2.8rem;
    margin: 1rem 0;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.article-header .subtitle {
    font-size: 1.3rem;
    color: var(--text-primary);
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
}

.category-tag {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.meta {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
    opacity: 0.9;
}

/* Content Layout */
.content-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    padding: 3rem 0;
}

/* Sidebar TOC */
.sidebar {
    position: sticky;
    top: 80px;
    height: fit-content;
}

.toc {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-cyan);
}

.toc h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.toc ul {
    list-style: none;
}

.toc li {
    margin: 0.5rem 0;
}

.toc a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

/* Main Content */
.main-content {
    background: var(--light-bg);
    padding: 2.5rem;
    border-radius: 16px;
}

.main-content section {
    margin-bottom: 3rem;
}

.main-content h2 {
    font-size: 2rem;
    color: var(--primary-cyan);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(0, 212, 255, 0.3);
}

.main-content h3 {
    font-size: 1.4rem;
    color: var(--primary-purple);
    margin: 2rem 0 1rem;
}

.main-content p {
    margin-bottom: 1.2rem;
    color: var(--text-secondary);
}

.main-content ul {
    margin: 1rem 0 1.5rem 1.5rem;
}

.main-content li {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

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

/* Comparison Table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-table th {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    font-weight: 600;
}

.comparison-table tr:hover {
    background: rgba(0, 212, 255, 0.1);
}

/* Ad Container */
.ad-container {
    padding: 2rem 0;
    text-align: center;
}

.ad-banner {
    background: var(--light-bg);
    padding: 1rem;
    border-radius: 8px;
    min-height: 90px;
}

/* Social Bar */
.social-bar {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 999;
}

/* Native Banner */
.native-banner {
    margin: 2rem 0;
    text-align: center;
}

/* Footer */
footer {
    background: var(--light-bg);
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--primary-cyan);
    margin-bottom: 1rem;
}

.footer-section h4 {
    color: var(--primary-purple);
    margin-bottom: 1rem;
}

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

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin: 0.5rem 0;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 900px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .article-header h1 {
        font-size: 2rem;
    }

    .nav-links {
        display: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}