:root{--bg: #0a0e1a;--bg-secondary: #0f172a;--card: #1e293b;--card-hover: #2d3b52;--accent: #3b82f6;--accent-dark: #2563eb;--accent-light: #60a5fa;--green: #10b981;--green-dark: #059669;--text: #f1f5f9;--text-dim: #94a3b8;--text-muted: #64748b;--border: #334155;--gold: #f59e0b;--gold-dark: #d97706;--purple: #8b5cf6;--red: #ef4444;--shadow: rgba(0, 0, 0, .3);--shadow-lg: rgba(0, 0, 0, .5);--glow: rgba(59, 130, 246, .15)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden}::-webkit-scrollbar{width:12px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:6px}::-webkit-scrollbar-thumb:hover{background:var(--accent)}nav{background:#0f172af2;position:sticky;top:0;z-index:1000;border-bottom:1px solid 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i{color:var(--accent)}.countries-list{display:flex;flex-direction:column;gap:12px}.country-item{display:flex;justify-content:space-between;align-items:center;padding:12px 15px;background:var(--bg-secondary);border-radius:10px;border:1px solid var(--border);transition:all .3s ease}.country-item:hover{background:var(--card-hover);border-color:var(--accent);transform:translate(5px)}.country-name{display:flex;align-items:center;gap:10px;font-weight:600;color:var(--text)}.country-flag{font-size:1.4rem}.country-count{font-weight:700;color:var(--accent);font-size:1rem}.loading-spinner{text-align:center;padding:40px 20px;color:var(--text-dim);font-size:.95rem}.loading-spinner i{font-size:1.5rem;margin-bottom:10px;display:block;color:var(--accent)}.no-data{text-align:center;padding:20px;color:var(--text-dim);font-size:.9rem}.theme-toggle{background:var(--card);border:1px solid var(--border);color:var(--text);padding:10px 14px;border-radius:8px;cursor:pointer;transition:all .3s 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.phase-details{opacity:1;margin-top:20px;padding-top:20px}.phase-details p{margin-bottom:15px;font-size:.95rem;line-height:1.6}.phase-topics{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.phase-resources h5{margin-bottom:10px;color:var(--text);font-size:.9rem;text-transform:uppercase;letter-spacing:.5px}.video-btn.secondary{margin-top:8px;background:transparent;border-color:var(--text-dim);color:var(--text-dim)}.video-btn.secondary:hover{border-color:var(--text);color:var(--text);background:var(--bg-secondary)}.phase-card.gold{border-color:var(--gold)}.phase-card.gold .phase-tag{color:var(--gold);background:#f59e0b1a}.phase-card.interactive.gold:hover{border-color:var(--gold)}.timeline-item:has(.gold) .timeline-dot{border-color:var(--gold)}.timeline-item:has(.gold):hover .timeline-dot{background:var(--gold)}@media (max-width: 768px){.timeline-line{left:20px}.timeline-item{width:100%;padding-left:50px;padding-right:0!important}.timeline-item.left,.timeline-item.right{margin-left:0}.timeline-dot{left:10px!important;right:auto!important}.timeline-item.left .timeline-dot,.timeline-item.right .timeline-dot{left:11px!important}}.favorites-section{margin-bottom:80px}.favorites-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(400px,1fr));gap:30px;margin-bottom:30px}.favorite-card{background:var(--card);padding:35px;border-radius:16px;border:2px solid var(--border);position:relative;overflow:hidden;transition:all .4s ease}.favorite-card:before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(90deg,#f59e0b,#ef4444);transform:scaleX(0);transform-origin:left;transition:transform .4s ease}.favorite-card:hover:before{transform:scaleX(1)}.favorite-card:hover{transform:translateY(-8px);border-color:var(--gold);box-shadow:0 20px 60px var(--shadow-lg),0 0 40px #f59e0b33}.favorite-badge{position:absolute;top:20px;right:20px;background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;padding:8px 16px;border-radius:20px;font-size:.75rem;font-weight:700;display:flex;align-items:center;gap:6px;box-shadow:0 4px 12px #ef44444d;animation:heartbeat 2s ease-in-out infinite}@keyframes heartbeat{0%,to{transform:scale(1)}10%,30%{transform:scale(1.1)}20%,40%{transform:scale(1)}}.favorite-badge i{animation:pulse 1.5s ease-in-out infinite}.favorite-header{display:flex;align-items:center;gap:15px;margin-bottom:20px}.favorite-icon{width:60px;height:60px;background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff;box-shadow:0 8px 20px #f59e0b4d}.favorite-meta{flex:1}.favorite-university{font-size:.85rem;font-weight:700;color:var(--gold);text-transform:uppercase;letter-spacing:1px}.favorite-professor{font-size:.9rem;color:var(--text-dim);margin-top:2px}.favorite-card h3{font-size:1.4rem;font-weight:700;margin-bottom:15px;color:var(--text)}.favorite-card p{font-size:.95rem;color:var(--text-dim);line-height:1.7;margin-bottom:20px}.favorite-topics{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.favorite-stats{display:flex;gap:20px;margin-bottom:20px;padding:15px;background:var(--bg-secondary);border-radius:8px;border:1px solid var(--border)}.stat-item{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-dim)}.stat-item i{color:var(--gold)}.favorite-btn{display:inline-flex;align-items:center;gap:10px;color:#fff;background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);text-decoration:none;font-weight:600;font-size:.95rem;padding:14px 24px;border-radius:10px;transition:all .3s 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var(--border);border-radius:4px;color:var(--text-muted);font-weight:500}.accordion-controls{display:flex;align-items:center;gap:15px}.checkbox-container{position:relative;cursor:pointer;-webkit-user-select:none;user-select:none}.checkbox-container input{position:absolute;opacity:0;cursor:pointer}.checkmark{display:block;width:24px;height:24px;background:var(--bg-secondary);border:2px solid var(--border);border-radius:6px;transition:all .3s ease}.checkbox-container:hover .checkmark{border-color:var(--accent)}.checkbox-container input:checked~.checkmark{background:var(--green);border-color:var(--green)}.checkmark:after{content:"";position:absolute;display:none;left:7px;top:3px;width:6px;height:11px;border:solid white;border-width:0 2px 2px 0;transform:rotate(45deg)}.checkbox-container input:checked~.checkmark:after{display:block}.accordion-btn i{color:var(--text-dim);transition:transform .3s ease;font-size:1.1rem}.accordion-item.active .accordion-btn 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0;border-radius:8px;display:flex;gap:12px;align-items:flex-start}.key-insight i{color:var(--accent);font-size:1.3rem;margin-top:2px}.key-insight.warning{background:#ef44441a;border-left-color:var(--red)}.key-insight.warning i{color:var(--red)}.comparison-table{margin:20px 0}.comparison-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}.comparison-cell{background:var(--bg-secondary);padding:20px;border-radius:8px;border:1px solid var(--border)}.comparison-cell strong{display:block;color:var(--accent);margin-bottom:12px;font-size:1.05rem}.code-example{margin:20px 0}.solution-diagram pre,.timing-diagram pre,.bit-explanation pre{background:var(--bg-secondary);color:var(--text-dim);font-family:monospace;font-size:.85rem;line-height:1.6}.formula{background:var(--bg-secondary);padding:15px;border-radius:8px;text-align:center;font-family:Courier New,monospace;font-size:1.1rem;color:var(--accent);margin:15px 0;border:1px solid var(--border)}.fifo-logic{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:20px 0}.logic-section{background:var(--bg-secondary);padding:20px;border-radius:8px;border:1px solid var(--border)}.logic-section strong{display:block;color:var(--green);margin-bottom:10px}.pipeline-stages,.dma-flow{display:flex;flex-direction:column;gap:15px;margin:20px 0}.stage,.flow-step{background:var(--bg-secondary);padding:20px;border-radius:8px;border-left:4px solid var(--accent)}.stage-number,.step-number{display:inline-block;width:30px;height:30px;background:var(--accent);color:#fff;border-radius:50%;text-align:center;line-height:30px;font-weight:700;margin-right:10px}.flow-arrow{text-align:center;color:var(--accent);font-size:1.5rem;font-weight:700}.mesi-states{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:15px;margin:20px 0}.mesi-state{background:var(--bg-secondary);padding:20px;border-radius:8px;border:2px solid var(--border);text-align:center}.state-icon{width:50px;height:50px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:800;margin:0 auto 15px;color:#fff}.mesi-state.modified .state-icon{background:var(--red)}.mesi-state.exclusive .state-icon{background:var(--green)}.mesi-state.shared .state-icon{background:var(--accent)}.mesi-state.invalid .state-icon{background:var(--text-muted)}.mesi-state strong{display:block;margin-bottom:10px;font-size:1.1rem}.warning-box{background:#ef44441a;border:1px solid var(--red);padding:20px;border-radius:8px;margin:20px 0}.warning-box p{margin-bottom:8px}footer{background:var(--bg-secondary);border-top:1px solid var(--border);padding:60px 5% 30px;margin-top:80px}.footer-content{max-width:1400px;margin:0 auto 40px;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:40px}.footer-section h4{color:var(--text);font-size:1.2rem;margin-bottom:15px}.footer-section p{color:var(--text-dim);font-size:.9rem;line-height:1.6}.footer-section a{display:block;color:var(--text-dim);text-decoration:none;margin-bottom:10px;font-size:.9rem;transition:color .3s ease}.footer-section a:hover{color:var(--accent)}.footer-bottom{text-align:center;padding-top:30px;border-top:1px solid var(--border);color:var(--text-dim);font-size:.9rem}.footer-bottom p{margin-bottom:10px}@media (max-width: 1024px){.progress-dashboard{grid-template-columns:1fr}.overall-progress{margin-bottom:20px}}@media (max-width: 768px){.hero h1{font-size:2.5rem}.hero p{font-size:1rem}.hero-stats{flex-direction:column;gap:30px}.nav-links{display:none}.phase-grid,.comparison-row,.fifo-logic{grid-template-columns:1fr}.question-content{flex-direction:column;align-items:flex-start}.search-bar{font-size:1rem;padding:16px 20px 16px 50px}}@media (max-width: 480px){.hero h1{font-size:2rem}.section-header{flex-direction:column;align-items:flex-start;gap:15px}.accordion-btn{padding:15px}.content-inner{padding:20px 15px}}.resource-links a:hover{text-decoration:underline!important;opacity:.8}.popup-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:1000;justify-content:center;align-items:center;animation:fadeIn .3s ease}.popup-overlay.show{display:flex}.popup-content{background:var(--card);border:1px solid var(--border);padding:2rem;border-radius:16px;max-width:400px;width:90%;text-align:center;position:relative;box-shadow:0 10px 30px #0000004d;animation:slideUp .4s cubic-bezier(.175,.885,.32,1.275)}.close-popup{position:absolute;top:10px;right:15px;background:none;border:none;font-size:24px;color:var(--text-dim);cursor:pointer;transition:color .3s}.close-popup:hover{color:var(--text)}.author-avatar img{width:80px;height:80px;border-radius:50%;border:3px solid var(--accent);margin-bottom:1rem;object-fit:cover}.popup-header h3{margin:.5rem 0;color:var(--text)}.popup-header p{color:var(--text-dim);font-size:.9rem;margin-bottom:1.5rem}.popup-actions{display:flex;flex-direction:column;gap:10px}.popup-btn{display:flex;align-items:center;justify-content:center;gap:10px;padding:12px;border-radius:8px;text-decoration:none;font-weight:600;transition:transform .2s,opacity .2s}.popup-btn:hover{transform:translateY(-2px);opacity:.9}.popup-btn.linkedin{background:#0077b5;color:#fff}.popup-btn.github{background:#333;color:#fff}[data-theme=dark] .popup-btn.github{background:#f0f6fc;color:#333}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}