/* --- Advanced Section (Premium) --- */
.section-advanced {
    background: linear-gradient(135deg, #1a1a1a 0%, #2c3e50 100%);
    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 rgba(0, 0, 0, 0.15);
}

.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: rgba(212, 175, 55, 0.3);
}

.section-advanced .chapter-num {
    color: rgba(212, 175, 55, 0.7);
}

.section-advanced .lead {
    color: #cccccc;
    font-style: italic;
}

.section-advanced .module-item {
    border-bottom-color: rgba(212, 175, 55, 0.2);
}

.section-advanced .module-item:hover {
    background-color: rgba(212, 175, 55, 0.05);
}

.section-advanced h3 {
    color: #fff;
}

.section-advanced .module-meta {
    color: #aaa;
}

.section-advanced .tag {
    border-color: #D4AF37;
    color: #D4AF37;
    background: rgba(0, 0, 0, 0.3);
}

.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);
    }
}