:root{--primary-50: #eff6ff;--primary-100: #dbeafe;--primary-200: #bfdbfe;--primary-300: #93c5fd;--primary-400: #60a5fa;--primary-500: #3b82f6;--primary-600: #2563eb;--primary-700: #1d4ed8;--primary-800: #1e40af;--primary-900: #1e3a8a;--accent-400: #a78bfa;--accent-500: #8b5cf6;--accent-600: #7c3aed;--success-500: #22c55e;--warning-500: #f59e0b;--error-500: #ef4444;--gray-50: #f8fafc;--gray-100: #f1f5f9;--gray-200: #e2e8f0;--gray-300: #cbd5e1;--gray-400: #94a3b8;--gray-500: #64748b;--gray-600: #475569;--gray-700: #334155;--gray-800: #1e293b;--gray-900: #0f172a;--gray-950: #020617;--bg-primary: #f4f1f8;--bg-secondary: #eae6f0;--bg-tertiary: #e2ddec;--bg-card: #ffffff;--bg-card-hover: #faf9fb;--bg-glass: rgba(244, 241, 248, .7);--bg-glass-strong: rgba(244, 241, 248, .85);--bg-overlay: rgba(15, 23, 42, .4);--text-primary: #0f172a;--text-secondary: #475569;--text-tertiary: #94a3b8;--text-inverse: #ffffff;--text-link: #3b82f6;--border-color: #e2e8f0;--border-color-hover: #cbd5e1;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .05);--shadow-glow: 0 0 20px rgba(59, 130, 246, .3);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--transition-spring: .5s cubic-bezier(.34, 1.56, .64, 1);--container-max: 1280px;--navbar-height: 72px}[data-theme=dark]{--bg-primary: #020403;--bg-secondary: #0a0d0c;--bg-tertiary: #141a18;--bg-card: #0b0e0d;--bg-card-hover: #141a18;--bg-glass: rgba(2, 4, 3, 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slideInRight{0%{opacity:0;transform:translate(30px)}to{opacity:1;transform:translate(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.animate-fade-in{animation:fadeIn .5s ease forwards}.animate-fade-in-up{animation:fadeInUp .6s ease forwards}.animate-fade-in-down{animation:fadeInDown .5s ease forwards}.animate-slide-left{animation:slideInLeft .5s ease forwards}.animate-slide-right{animation:slideInRight .5s ease forwards}.animate-scale-in{animation:scaleIn .4s ease forwards}.stagger-1{animation-delay:.1s;opacity:0}.stagger-2{animation-delay:.2s;opacity:0}.stagger-3{animation-delay:.3s;opacity:0}.stagger-4{animation-delay:.4s;opacity:0}.stagger-5{animation-delay:.5s;opacity:0}.stagger-6{animation-delay:.6s;opacity:0}.page-transition{animation:fadeInUp .4s ease forwards}.skeleton{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--bg-secondary) 50%,var(--bg-tertiary) 75%);background-size:400% 100%;animation:shimmer 1.5s ease-in-out infinite;border-radius:var(--radius-sm)}@media(max-width:768px){.container{padding:0 16px}.section{padding:48px 0}}@media(max-width:480px){.container{padding:0 12px}.section{padding:32px 0}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--gray-400);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--gray-500)}::selection{background:var(--primary-500);color:#fff}:root{--navbar-height: 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a:hover{background:#3b82f61a}.navbar-links a.active{color:var(--primary-600);background:var(--primary-50);font-weight:600}[data-theme=dark] .navbar-links a.active{color:var(--primary-400);background:#3b82f626}.navbar-actions{display:flex;align-items:center;gap:8px}.theme-switch-wrap{display:flex;align-items:center;gap:6px;cursor:pointer;padding:4px 6px;border-radius:var(--radius-full);transition:background var(--transition-fast);-webkit-user-select:none;user-select:none}.theme-switch-wrap:hover{background:var(--bg-tertiary)}.theme-switch-icon{font-size:16px!important;transition:all .3s ease}.sun-icon{color:#f59e0b;opacity:1}.moon-icon,.theme-switch-wrap.dark-active .sun-icon{color:var(--text-tertiary);opacity:.4}.theme-switch-wrap.dark-active .moon-icon{color:#818cf8;opacity:1}.theme-switch-track{width:40px;height:22px;border-radius:12px;background:linear-gradient(135deg,#93c5fd,#60a5fa);position:relative;transition:background .4s ease;box-shadow:inset 0 1px 3px 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12px;font-size:.85rem;font-weight:500;color:var(--text-secondary);border-radius:var(--radius-sm);transition:all var(--transition-fast);cursor:pointer;width:100%;text-align:left;text-decoration:none}.profile-dropdown-item:hover{background:var(--bg-tertiary);color:var(--text-primary)}.profile-dropdown-item .material-icons-round{font-size:18px;color:var(--text-tertiary)}.profile-dropdown-item:hover .material-icons-round{color:var(--primary-500)}.profile-logout-btn:hover{background:#ef44440f;color:#ef4444}.profile-logout-btn:hover .material-icons-round{color:#ef4444!important}.btn-google-signin-nav{display:flex;align-items:center;gap:8px;padding:7px 16px;border-radius:var(--radius-full);background:var(--bg-card);border:1px solid var(--border-color);color:var(--text-primary);font-size:.82rem;font-weight:600;cursor:pointer;transition:all 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var(--transition-fast)}.mobile-menu-links a:hover,.mobile-menu-links a.active{color:var(--primary-500);background:var(--primary-50)}[data-theme=dark] .mobile-menu-links a:hover,[data-theme=dark] .mobile-menu-links a.active{background:#3b82f61a}.mobile-menu-links a .material-icons-round{font-size:20px}@media(max-width:900px){.navbar-bottom-row{display:none!important}.navbar-top-row{height:100%;border-bottom:none}.navbar-links{display:none}.mobile-menu-btn{display:flex}.mobile-menu-overlay,.mobile-menu{display:block}}@media(max-width:480px){.navbar-inner-top,.navbar-inner-bottom{padding:0 12px}.navbar-logo{font-size:1.15rem}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;font-size:.9rem;font-weight:600;border-radius:var(--radius-sm);transition:all var(--transition-fast);white-space:nowrap;cursor:pointer}.btn-primary{background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:#fff;box-shadow:0 2px 8px #3b82f64d}.btn-primary:hover{background:linear-gradient(135deg,var(--primary-600),var(--primary-700));box-shadow:0 4px 16px #3b82f666;transform:translateY(-1px);color:#fff}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--border-color-hover);transform:translateY(-1px);color:var(--text-primary)}.btn-download{background:linear-gradient(135deg,var(--success-500),#16a34a);color:#fff;padding:14px 32px;font-size:1rem;border-radius:var(--radius-md);box-shadow:0 4px 12px #22c55e4d}.btn-download:hover{transform:translateY(-2px);box-shadow:0 6px 20px #22c55e66;color:#fff}.btn-download .material-icons-round{animation:float 2s ease-in-out infinite}.btn-sm{padding:8px 16px;font-size:.8rem}.btn-lg{padding:16px 36px;font-size:1rem}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--radius-sm)}.resource-card{position:relative;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition-normal);cursor:pointer}.resource-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-xl);border-color:var(--primary-200)}[data-theme=dark] .resource-card:hover{border-color:var(--primary-800)}.card-image{position:relative;width:100%;height:200px;overflow:hidden;background:var(--bg-tertiary)}.card-image img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-slow)}.resource-card:hover .card-image img{transform:scale(1.05)}.card-badge{position:absolute;top:12px;left:12px;padding:4px 12px;font-size:.75rem;font-weight:600;color:#fff;border-radius:var(--radius-full);z-index:2}.card-type-badge{position:absolute;top:12px;right:12px;padding:4px 10px;font-size:.7rem;font-weight:600;background:var(--bg-glass);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);color:#fff;border-radius:var(--radius-full);z-index:2;text-transform:uppercase;letter-spacing:.5px}.card-content{padding:20px}.card-subject{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}.card-title{font-size:1.05rem;font-weight:700;color:var(--text-primary);margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-description{font-size:.85rem;color:var(--text-secondary);line-height:1.5;margin-bottom:16px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-meta{display:flex;align-items:center;gap:16px;font-size:.78rem;color:var(--text-tertiary);margin-bottom:16px}.card-meta-item{display:flex;align-items:center;gap:4px}.card-meta-item .material-icons-round{font-size:14px}.card-footer{display:flex;align-items:center;justify-content:space-between;padding-top:16px;border-top:1px solid var(--border-color)}.card-download-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:#fff;font-size:.82rem;font-weight:600;border-radius:var(--radius-full);transition:all var(--transition-fast)}.card-download-btn:hover{background:linear-gradient(135deg,var(--primary-600),var(--primary-700));box-shadow:0 4px 12px #3b82f64d;transform:translateY(-1px);color:#fff}.card-download-btn .material-icons-round{font-size:16px}.badge-nodejs{background:linear-gradient(135deg,#22c55e,#16a34a)}.badge-cpp{background:linear-gradient(135deg,#3b82f6,#2563eb)}.badge-web{background:linear-gradient(135deg,#8b5cf6,#7c3aed)}.badge-default{background:linear-gradient(135deg,var(--gray-500),var(--gray-600))}.subject-java{color:#ea580c}.subject-nodejs{color:#16a34a}.subject-cpp{color:#2563eb}.subject-python{color:#ca8a04}.subject-web{color:#7c3aed}.category-tabs{display:flex;align-items:center;gap:8px;overflow-x:auto;padding:4px;-ms-overflow-style:none;scrollbar-width:none}.category-tabs::-webkit-scrollbar{display:none}.category-tab{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;font-size:.85rem;font-weight:500;color:var(--text-secondary);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-full);white-space:nowrap;transition:all 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.hero-btn-secondary:hover{background:#fff3!important;color:#fff!important}[data-theme=dark] .hero-stat-card{background:#ffffff14!important;border:1px solid rgba(255,255,255,.1)!important;box-shadow:none!important}[data-theme=dark] .hero-stat-card:hover{background:#ffffff1f!important}[data-theme=dark] .hero-stat-card .stat-number{color:#fff!important}[data-theme=dark] .hero-stat-card .stat-label{color:#fff9!important}@media(max-width:900px){.hero-content{grid-template-columns:1fr;text-align:center;gap:40px}.hero-subtitle{margin:0 auto 36px}.hero-actions{justify-content:center}.hero-stats{max-width:400px;margin:0 auto}}@media(max-width:480px){.hero{min-height:100vh}.hero-actions{flex-direction:column}.hero-btn-primary,.hero-btn-secondary{width:100%;justify-content:center}}.quick-categories{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:-60px;position:relative;z-index:3}.quick-category-card{background:var(--bg-card);border:1px solid 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.material-icons-round{font-size:20px;color:var(--primary-500)}.download-meta-item .meta-label{font-size:.75rem;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.5px}.download-meta-item .meta-value{font-size:.95rem;font-weight:600;color:var(--text-primary)}.download-cta{margin-bottom:24px}.download-cta .btn-download{width:100%;padding:18px 32px;font-size:1.1rem}.download-share{display:flex;align-items:center;gap:12px}.download-share span{font-size:.85rem;color:var(--text-tertiary);font-weight:500}.download-share .share-btn{width:40px;height:40px;border-radius:var(--radius-sm);background:var(--bg-secondary);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);font-size:18px;transition:all var(--transition-fast)}.download-share .share-btn:hover{background:var(--primary-500);color:#fff;border-color:var(--primary-500)}.related-section{margin-top:64px}@media(max-width:900px){.download-layout{grid-template-columns:1fr;gap:32px}.download-preview{max-height:400px;aspect-ratio:auto}.download-info{position:static}}.about-page{padding-top:var(--navbar-height)}.about-hero{background:linear-gradient(135deg,var(--bg-secondary),var(--bg-tertiary));padding:80px 0;text-align:center}[data-theme=dark] .about-hero{background:linear-gradient(135deg,var(--gray-900),var(--gray-800))}.about-content{max-width:800px;margin:0 auto;padding:60px 24px}.about-content h2{margin-bottom:16px}.about-content p{margin-bottom:20px;font-size:1.05rem}.about-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}.about-feature{text-align:center;padding:32px 24px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg)}.about-feature .material-icons-round{font-size:40px;color:var(--primary-500);margin-bottom:16px}.about-feature h4{margin-bottom:8px}@media(max-width:768px){.about-features{grid-template-columns:1fr}}.contact-page{padding-top:var(--navbar-height)}.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;padding:60px 0}.contact-form{display:flex;flex-direction:column;gap:20px}.form-group{display:flex;flex-direction:column;gap:6px}.form-group label{font-size:.85rem;font-weight:600;color:var(--text-primary)}.form-group input,.form-group textarea{padding:14px 16px;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);transition:border-color var(--transition-fast)}.form-group input:focus,.form-group textarea:focus{border-color:var(--primary-500);box-shadow:0 0 0 4px #3b82f61a}.form-group textarea{min-height:150px;resize:vertical}.contact-info{display:flex;flex-direction:column;gap:24px}.contact-info-card{display:flex;gap:16px;padding:24px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg)}.contact-info-card .material-icons-round{font-size:24px;color:var(--primary-500);flex-shrink:0}.contact-info-card h4{margin-bottom:4px}.contact-info-card p{font-size:.9rem}@media(max-width:768px){.contact-grid{grid-template-columns:1fr;gap:32px}}.university-header{padding-top:calc(var(--navbar-height) + 24px);padding-bottom:32px;background:linear-gradient(180deg,var(--bg-secondary),var(--bg-primary));border-bottom:1px solid var(--border-color)}.breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:.82rem;color:var(--text-tertiary)}.breadcrumbs a{color:var(--text-secondary);font-weight:500;transition:color var(--transition-fast)}.breadcrumbs a:hover{color:var(--primary-500)}.breadcrumbs .divider{color:var(--text-tertiary);-webkit-user-select:none;user-select:none}.breadcrumbs .crumb-text{color:var(--text-tertiary);font-weight:500}.subject-tag{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;font-size:.78rem;font-weight:700;background:#3b82f614;color:var(--primary-600);border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.5px}[data-theme=dark] .subject-tag{background:#3b82f626;color:var(--primary-400)}.university-materials-main{padding:40px 0 80px;min-height:50vh}.resources-info-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--border-color)}.resources-info-bar .info-text{display:flex;align-items:center;gap:8px;font-size:.9rem;color:var(--text-secondary)}.resources-info-bar .info-text .material-icons-round{color:var(--primary-500);font-size:18px}.univ-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:30px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;max-width:600px;margin:40px auto;padding:48px 32px;background:var(--bg-glass-strong);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.empty-icon-wrap{width:80px;height:80px;border-radius:var(--radius-full);background:#3b82f60d;color:var(--primary-500);display:flex;align-items:center;justify-content:center;margin-bottom:24px}[data-theme=dark] .empty-icon-wrap{background:#3b82f61f;color:var(--primary-400)}.empty-icon-wrap .material-icons-round{font-size:40px}.empty-state h2{font-size:1.4rem;font-weight:800;margin-bottom:12px;color:var(--text-primary)}.empty-state p{font-size:.92rem;color:var(--text-secondary);line-height:1.6;margin-bottom:28px}.empty-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}@media(max-width:480px){.empty-actions{flex-direction:column;width:100%}.empty-actions .btn{width:100%}}.glass-card{background:var(--bg-glass-strong);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.chat-wrapper{display:flex;flex-direction:column;height:600px;max-height:calc(100vh - 250px);min-height:450px;overflow:hidden;position:relative;background:var(--bg-glass-strong);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.chat-header{padding:16px 24px;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;background:#fff3}[data-theme=dark] .chat-header{background:#00000026}.chat-tutor-profile{display:flex;align-items:center;gap:12px}.tutor-avatar{width:40px;height:40px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--primary-500),var(--accent-500));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 10px #3b82f640}.tutor-details h3{font-size:1rem;font-weight:700;margin:0;color:var(--text-primary)}.tutor-status{font-size:.75rem;color:var(--text-secondary);display:flex;align-items:center;gap:4px}.chat-clear-btn{color:var(--text-secondary);width:36px;height:36px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);border:1px solid transparent}.chat-clear-btn:hover{background:#ef44441a;color:var(--error-500)}.chat-body{flex:1;padding:24px;overflow-y:auto;-webkit-overflow-scrolling:touch;display:flex;flex-direction:column;gap:20px;scroll-behavior:smooth;background:#ffffff05}[data-theme=dark] .chat-body{background:#0000000d}.message-row{display:flex;gap:12px;width:100%}.tutor-row{justify-content:flex-start}.student-row{justify-content:flex-end}.message-avatar{width:32px;height:32px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:4px}.student-avatar{background:var(--gray-200);color:var(--gray-700)}[data-theme=dark] .student-avatar{background:var(--gray-700);color:var(--gray-200)}.message-bubble{max-width:75%;padding:12px 18px;border-radius:var(--radius-md);font-size:.95rem;line-height:1.5;word-break:break-word;box-shadow:var(--shadow-sm)}.tutor-bubble{background:var(--bg-card);color:var(--text-primary);border-top-left-radius:2px;border:1px solid var(--border-color)}.student-bubble{background:linear-gradient(135deg,var(--primary-600),var(--primary-700));color:#fff;border-top-right-radius:2px}[data-theme=dark] .student-bubble{background:linear-gradient(135deg,var(--primary-500),var(--primary-600))}.message-content{overflow-wrap:break-word}.message-content p{color:inherit;margin-bottom:8px}.message-content p:last-child{margin-bottom:0}.message-content ul,.message-content ol{margin-left:20px;margin-bottom:8px;list-style-type:disc}.message-content li{margin-bottom:4px}.message-content strong{font-weight:700}.chat-suggestions-container{padding:12px 24px;border-top:1px solid var(--border-color);background:#ffffff0d;overflow-x:auto}[data-theme=dark] .chat-suggestions-container{background:#0000001a}.chat-suggestions{display:flex;gap:10px;flex-wrap:nowrap;padding-bottom:4px}.suggestion-chip{padding:8px 16px;border-radius:var(--radius-full);background:var(--bg-card);border:1px solid var(--border-color);color:var(--text-secondary);font-size:.82rem;white-space:nowrap;transition:all var(--transition-fast);cursor:pointer}.suggestion-chip:hover{background:var(--primary-50);border-color:var(--primary-300);color:var(--primary-600);transform:translateY(-1px)}[data-theme=dark] .suggestion-chip:hover{background:#3b82f61a;border-color:var(--primary-500);color:var(--primary-400)}.chat-footer{padding:16px 24px;border-top:1px solid var(--border-color);background:var(--bg-card)}.chat-input-wrapper{display:flex;align-items:flex-end;gap:12px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:8px 12px;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.chat-input-wrapper:focus-within{border-color:var(--primary-400);box-shadow:0 0 0 3px #3b82f626}#chat-input{flex:1;background:transparent;color:var(--text-primary);border:none;resize:none;font-size:.95rem;padding:6px 4px;max-height:150px;min-height:24px;line-height:1.4}.chat-send-btn{width:36px;height:36px;border-radius:var(--radius-sm);background:var(--primary-500);color:#fff;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);cursor:pointer;flex-shrink:0}.chat-send-btn:hover:not(:disabled){background:var(--primary-600);transform:scale(1.05)}.chat-send-btn:disabled{background:var(--gray-300);color:var(--gray-500);cursor:not-allowed}[data-theme=dark] .chat-send-btn:disabled{background:var(--gray-700);color:var(--gray-500)}.typing-indicator{display:flex;align-items:center;gap:4px;padding:4px 6px}.typing-indicator span{width:8px;height:8px;background-color:var(--text-secondary);border-radius:50%;display:inline-block;opacity:.4;animation:typing-bounce 1.4s infinite ease-in-out both}.typing-indicator span:nth-child(1){animation-delay:0s}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes typing-bounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}.code-block{margin:12px 0;background:#1e1e1e!important;color:#d4d4d4;border-radius:var(--radius-sm);border:1px solid rgba(255,255,255,.1);overflow:hidden;font-family:var(--font-mono);font-size:.85rem}.code-header{display:flex;justify-content:space-between;align-items:center;background:#2d2d2d;padding:6px 12px;font-size:.75rem;color:#a0a0a0;text-transform:uppercase;font-weight:600;border-bottom:1px solid #3c3c3c}.copy-code-btn{background:transparent;border:1px solid #4d4d4d;color:#a0a0a0;padding:2px 8px;border-radius:4px;cursor:pointer;font-size:.7rem;transition:all .2s}.copy-code-btn:hover{background:#4d4d4d;color:#fff}.code-block code{display:block;padding:12px;overflow-x:auto;white-space:pre}code:not(.code-block code){background:#3b82f61a;color:var(--primary-600);padding:2px 6px;border-radius:4px;font-family:var(--font-mono);font-size:.9em}[data-theme=dark] code:not(.code-block code){background:#3b82f633;color:var(--primary-300)}.subjects-directory-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}.subject-directory-card{padding:24px;display:flex;flex-direction:column;gap:20px;border-radius:var(--radius-lg);transition:all var(--transition-normal)}.subject-directory-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--primary-300)}[data-theme=dark] .subject-directory-card:hover{border-color:var(--primary-500)}.subject-dir-header{display:flex;align-items:center;gap:16px}.subject-dir-icon{width:48px;height:48px;border-radius:var(--radius-md);background:#3b82f614;display:flex;align-items:center;justify-content:center;font-size:1.6rem;flex-shrink:0}[data-theme=dark] .subject-dir-icon{background:#3b82f629}.subject-dir-info h3{font-size:1.1rem;font-weight:700;margin-bottom:4px;color:var(--text-primary)}.subject-dir-count{font-size:.8rem;color:var(--text-tertiary)}.subject-dir-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.subj-explore-btn{display:flex;align-items:center;justify-content:center;gap:6px;padding:10px 8px;font-size:.78rem;font-weight:600;border-radius:var(--radius-sm);background:var(--bg-secondary);color:var(--text-secondary);border:1px solid var(--border-color);transition:all var(--transition-fast);cursor:pointer}.subj-explore-btn:hover:not(:disabled){background:var(--primary-50);border-color:var(--primary-300);color:var(--primary-600)}[data-theme=dark] .subj-explore-btn:hover:not(:disabled){background:#3b82f61a;border-color:var(--primary-500);color:var(--primary-400)}.subj-explore-btn:disabled{opacity:.45;cursor:not-allowed}.subj-explore-btn .material-icons-round{font-size:14px}.status-dot{width:8px;height:8px;border-radius:50%;background-color:var(--success-500);display:inline-block;box-shadow:0 0 8px var(--success-500);animation:pulse 2s infinite}.ai-suggested-image-wrap{box-shadow:var(--shadow-md);transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.ai-suggested-image-wrap:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.ai-suggested-image{transition:transform .5s ease}.ai-suggested-image-wrap:hover .ai-suggested-image{transform:scale(1.03)}.ai-search-results-html{color:var(--text-secondary)}.ai-search-results-html h3{font-size:1.15rem;font-weight:700;color:var(--text-primary);margin-top:24px;margin-bottom:12px}.ai-search-results-html h3:first-child{margin-top:0}.ai-search-results-html p{margin-bottom:16px}.ai-download-btn{transition:all var(--transition-fast)!important}.ai-download-btn:hover{transform:translateY(-2px);box-shadow:0 6px 14px #3b82f659!important;color:#fff!important}.ai-link{transition:color var(--transition-fast)}.ai-link:hover{color:var(--primary-600)!important}[data-theme=dark] .ai-link:hover{color:var(--primary-400)!important}.ai-search-btn-primary{transition:all var(--transition-fast)}.ai-search-btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 16px #3b82f666!important}.avatar-choice-item{position:relative;background:var(--bg-secondary)}.avatar-choice-item.active{border-color:var(--primary-500)!important;transform:scale(1.08);box-shadow:0 0 12px #3b82f666}.avatar-choice-item:hover{transform:scale(1.08);border-color:var(--primary-300)}.avatar-gallery{transition:all var(--transition-normal)}.ai-youtube-card{transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.ai-youtube-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.video-container{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;background:#000}.video-container iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}.articles-tabs-nav{display:flex;gap:12px;margin-bottom:32px;border-bottom:1px solid var(--border-color);padding-bottom:2px;position:relative}.article-tab-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;font-size:.95rem;font-weight:600;color:var(--text-secondary);background:transparent;border:none;border-bottom:3px solid transparent;cursor:pointer;transition:all var(--transition-fast);border-radius:var(--radius-sm) var(--radius-sm) 0 0}.article-tab-btn:hover{color:var(--primary-500);background:var(--bg-secondary)}.article-tab-btn.active{color:var(--primary-500);border-bottom-color:var(--primary-500);background:#3b82f60a}[data-theme=dark] .article-tab-btn.active{background:#3b82f614}.articles-tab-content{display:none;animation:fadeIn .4s 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var(--border-color);background:var(--bg-card);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.category-pills .pill:hover{border-color:var(--primary-300);color:var(--primary-500)}.category-pills .pill.active{background:var(--primary-500);color:#fff;border-color:var(--primary-500);box-shadow:0 2px 8px #3b82f640}.articles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:30px;margin-bottom:60px}.article-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition-normal);display:flex;flex-direction:column;box-shadow:var(--shadow-sm)}.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--primary-200)}[data-theme=dark] .article-card:hover{border-color:var(--primary-800)}.article-card-image{position:relative;height:200px;overflow:hidden;background:var(--bg-tertiary)}.article-card-image img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-slow)}.article-card:hover .article-card-image img{transform:scale(1.04)}.article-card-badge{position:absolute;top:12px;left:12px;padding:4px 12px;font-size:.72rem;font-weight:700;color:#fff;border-radius:var(--radius-full);z-index:2;text-transform:uppercase;letter-spacing:.5px}.badge-web{background:linear-gradient(135deg,#3b82f6,#06b6d4)}.badge-java{background:linear-gradient(135deg,#f97316,#ea580c)}.badge-nodejs{background:linear-gradient(135deg,#22c55e,#15803d)}.badge-python{background:linear-gradient(135deg,#eab308,#ca8a04)}.badge-cpp{background:linear-gradient(135deg,#ec4899,#d946ef)}.badge-general{background:linear-gradient(135deg,#64748b,#475569)}.badge-mgt{background:linear-gradient(135deg,#6366f1,#a855f7)}.article-card-body{padding:24px;display:flex;flex-direction:column;flex:1}.article-card-meta{font-size:.78rem;color:var(--text-tertiary);margin-bottom:12px;font-weight:500}.article-card-title{font-size:1.15rem;font-weight:700;color:var(--text-primary);margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.article-card-desc{font-size:.88rem;color:var(--text-secondary);line-height:1.6;margin-bottom:20px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.article-card-footer{margin-top:auto;display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--border-color);padding-top:16px}.article-card-author{font-size:.8rem;font-weight:600;color:var(--text-secondary)}.btn-preview-article{display:inline-flex;align-items:center;gap:4px;font-size:.82rem;font-weight:700;color:var(--primary-500);transition:all var(--transition-fast);cursor:pointer}.btn-preview-article:hover{color:var(--primary-600);gap:8px}.btn-preview-article .material-icons-round{font-size:16px}.no-articles-found{text-align:center;padding:60px 20px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);grid-column:1 / -1;color:var(--text-secondary)}.no-articles-found .material-icons-round{font-size:48px;color:var(--text-tertiary);margin-bottom:12px}.no-articles-found h3{font-size:1.2rem;font-weight:700;margin-bottom:6px;color:var(--text-primary)}.custom-editor-container{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-xl);padding:40px;box-shadow:var(--shadow-sm);margin-bottom:60px}.editor-header{margin-bottom:32px;border-bottom:1px solid var(--border-color);padding-bottom:20px}.editor-header h2{font-size:1.5rem;font-weight:800;color:var(--text-primary);margin-bottom:8px}.editor-header p{font-size:.95rem;color:var(--text-secondary)}.custom-note-form{display:flex;flex-direction:column;gap:24px}.form-row{display:flex;gap:24px;flex-wrap:wrap}.flex-1{flex:1;min-width:250px}.flex-2{flex:2;min-width:280px}.form-group .required{color:#ef4444;font-weight:700}.form-group select.filter-select,.form-group select{width:100%;padding:12px 16px;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);font-size:.9rem;font-weight:500;cursor:pointer}.form-group select:focus{border-color:var(--primary-500);outline:none}.editor-formatting-hint{padding:12px 16px;background:#3b82f60d;border-left:4px solid var(--primary-500);border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:.8rem;color:var(--text-secondary);line-height:1.5;margin-bottom:10px}.editor-formatting-hint code{background:#00000014;padding:2px 6px;border-radius:var(--radius-sm);font-family:var(--font-mono);font-size:.78rem}[data-theme=dark] .editor-formatting-hint code{background:#ffffff14}.custom-note-form textarea{font-family:inherit;font-size:.95rem;line-height:1.6}.editor-actions{display:flex;gap:16px;border-top:1px solid var(--border-color);padding-top:24px;margin-top:12px}@media(max-width:768px){.custom-editor-container{padding:24px}.form-row{gap:16px}}.reader-progress-bar{position:fixed;top:0;left:0;height:4px;width:0%;background:linear-gradient(to right,var(--primary-500),var(--accent-500));z-index:2000;transition:width .1s ease}.reader-wrapper{min-height:100vh;background:var(--bg-primary);display:flex;flex-direction:column}.reader-hero-header{position:relative;padding:100px 0 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#ef4444}.review-question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.question-num{font-size:.88rem;font-weight:700;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em}.question-status-badge{display:inline-flex;align-items:center;gap:6px;font-size:.82rem;font-weight:700;padding:4px 10px;border-radius:var(--radius-full)}.question-status-badge.correct{background:#10b9811a;color:#10b981}.question-status-badge.incorrect{background:#ef44441a;color:#ef4444}.question-status-badge .material-icons-round{font-size:16px}.review-question-text{font-size:1.15rem;font-weight:700;color:var(--text-primary);line-height:1.4;margin-bottom:20px}.review-options-list{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}.review-option{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-card);border:1px solid 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#333!important;color:#000!important;background:transparent!important;padding:2px 8px!important}.author-avatar-fallback{display:none!important}.reader-body{padding:30px 0!important}.reader-body-container{max-width:100%!important;font-size:11pt!important;line-height:1.6!important}.article-content-view h2,.article-content-view h3{page-break-after:avoid}.article-content-view pre{background:#f1f5f9!important;border:1px solid #cbd5e1!important;color:#000!important;page-break-inside:avoid}.article-content-view pre 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