.section-advanced{background:linear-gradient(135deg,#1a1a1a,#2c3e50);color:#f0f0f0;padding:var(--space-xl);border-radius:var(--border-radius-lg);border:1px solid #D4AF37;position:relative;overflow:hidden;box-shadow:0 10px 30px #00000026}.section-advanced:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,transparent,#D4AF37,transparent)}.section-advanced h2{color:#d4af37;border-bottom-color:#d4af374d}.section-advanced .chapter-num{color:#d4af37b3}.section-advanced .lead{color:#ccc;font-style:italic}.section-advanced .module-item{border-bottom-color:#d4af3733}.section-advanced .module-item:hover{background-color:#d4af370d}.section-advanced h3{color:#fff}.section-advanced .module-meta{color:#aaa}.section-advanced .tag{border-color:#d4af37;color:#d4af37;background:#0000004d}.section-advanced .content-note .margin-note{border-left-color:#d4af37;color:#aaa}.section-advanced .content-note .margin-note strong{color:#d4af37}@media(max-width:768px){.section-advanced{padding:var(--space-m)}}