body { 
    background-color: #030712; 
    color: #f3f4f6; 
    font-family: 'Inter', sans-serif;
}

h1, h2, h3, h4 {
    font-family: 'Outfit', sans-serif;
}

/* Premium Dark Mode Scrollbar custom styling */
::-webkit-scrollbar { 
    height: 8px; 
    width: 8px; 
}
::-webkit-scrollbar-track { 
    background: #0b0f19; 
    border-radius: 4px; 
}
::-webkit-scrollbar-thumb { 
    background: #1f2937; 
    border-radius: 4px; 
}
::-webkit-scrollbar-thumb:hover { 
    background: #374151; 
}

/* Premium dynamic glassmorphism panels */
.glass-panel {
    background: rgba(17, 24, 39, 0.7);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(75, 85, 99, 0.3);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

/* Sidebar Timeline Progress Indicators */
.timeline-line::before {
    content: ''; 
    position: absolute; 
    left: 1.5rem; 
    top: 3.25rem; 
    bottom: -1rem;
    width: 2px; 
    background: linear-gradient(to bottom, #3b82f6 0%, #6366f1 50%, #1f2937 100%);
    z-index: 0; 
    opacity: 0.3;
}
.timeline-item:last-child .timeline-line::before { 
    display: none; 
}

/* Math breakdowns with indicators */
.math-breakdown li { 
    position: relative; 
    padding-left: 1.25rem; 
    margin-bottom: 0.5rem; 
}
.math-breakdown li::before { 
    content: '→'; 
    position: absolute; 
    left: 0; 
    color: #3b82f6; 
    font-weight: bold; 
}

/* Prism JS tomorrow theme overrides for premium contrast */
pre[class*="language-"] { 
    background: #05070c !important; 
    border-radius: 12px; 
    margin: 0; 
    padding: 1.25rem !important; 
    border: 1px solid rgba(75, 85, 99, 0.1); 
}
code[class*="language-"], pre[class*="language-"] { 
    text-shadow: none !important; 
    font-size: 0.85rem; 
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; 
}

/* Custom design glows and animations */
.glow-text-blue { 
    text-shadow: 0 0 15px rgba(59, 130, 246, 0.5); 
}
.glow-border-indigo:hover { 
    border-color: rgba(99, 102, 241, 0.8); 
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.2); 
}
.neon-glow-red { 
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4); 
}

/* Fade-in transitions */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}