:root {
    --bg-dark: #1a202c;
    --card-bg: #2d3748;
    --text-main: #e2e8f0;
    --text-muted: #a0aec0;
    --brand-blue: #4299e1;
    --brand-success: #48bb78;
    --border: #4a5568;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.8;
    margin: 0;
    padding: 0;
}

.article-header {
    background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    padding: 100px 20px;
    text-align: center;
    border-bottom: 2px solid var(--brand-blue);
}

.article-header h1 {
    font-size: 3rem;
    margin: 0;
    color: white;
}

.article-meta {
    margin-top: 20px;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.container {
    max-width: 900px;
    margin: -60px auto 60px;
    background: var(--card-bg);
    padding: 60px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    position: relative;
    z-index: 10;
}

h2 {
    color: var(--brand-blue);
    font-size: 2rem;
    margin-top: 40px;
    border-left: 5px solid var(--brand-blue);
    padding-left: 15px;
}

h3 {
    color: var(--brand-success);
    font-size: 1.5rem;
    margin-top: 30px;
}

p, li {
    font-size: 1.15rem;
    margin-bottom: 20px;
}

ul, ol {
    margin-bottom: 30px;
}

.back-link {
    display: block;
    max-width: 900px;
    margin: 20px auto;
    color: var(--brand-blue);
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
}

.back-link:hover {
    text-decoration: underline;
}

.footer {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
    .container {
        padding: 30px;
        margin-top: -30px;
        border-radius: 0;
    }
    .article-header h1 {
        font-size: 2rem;
    }
}