@import "https://fonts.googleapis.com/css2?family=Cinzel:wght@500;600;700;800;900&family=Cormorant+Garamond:wght@500;600;700&family=Great+Vibes&family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@300;400;500;600;700;800;900&family=Poppins:wght@300;400;500;600;700;800&family=Playfair+Display:ital,wght@0,600;0,700;0,800;1,400&display=swap";:root{--primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#2563eb1a;--primary-glow:#2563eb4d;--secondary:#0ea5e9;--accent:#06b6d4;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--primary-color:#2563eb;--secondary-color:#0ea5e9;--accent-color:#06b6d4;--success-color:#10b981;--warning-color:#f59e0b;--danger-color:#ef4444;--bg-page:#f8fafc;--bg-card:#fff;--bg-card-hover:#f8fafc;--bg-sidebar:#fff;--bg-navbar:#ffffffeb;--bg-input:#f1f5f9;--bg-input-focus:#fff;--bg-modal:#fff;--bg-overlay:#00000080;--bg-tooltip:#1e293b;--bg-badge:#2563eb14;--bg-dark:#f8fafc;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--text-placeholder:#94a3b8;--text-inverse:#fff;--text-main:#0f172a;--border:#e2e8f0;--border-strong:#cbd5e1;--border-color:#e2e8f0;--border-focus:#2563eb;--shadow-xs:0 1px 2px #0000000a;--shadow-sm:0 1px 3px #0000000d, 0 1px 2px #0000000a;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -1px #0000000d;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -2px #0000000a;--shadow-xl:0 20px 25px -5px #00000014, 0 10px 10px -5px #00000008;--shadow-2xl:0 25px 50px -12px #00000026;--shadow-card:0 4px 20px -2px #0f172a0a;--shadow-nav:0 4px 20px -2px #0f172a0a;--shadow-primary:0 8px 25px #2563eb4d;--sidebar-width:260px;--sidebar-collapsed-width:68px;--sidebar-transition:width .3s cubic-bezier(.4, 0, .2, 1);--navbar-height:72px;--navbar-height-mobile:60px;--font-main:"Outfit", "Inter", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--text-4xl:clamp(1.75rem, 4vw, 2.5rem);--text-3xl:clamp(1.4rem, 3vw, 2rem);--text-2xl:clamp(1.2rem, 2.5vw, 1.6rem);--text-xl:clamp(1.05rem, 2vw, 1.25rem);--text-lg:clamp(.95rem, 1.5vw, 1.1rem);--text-base:clamp(.875rem, 1.2vw, 1rem);--text-sm:clamp(.8rem, 1vw, .875rem);--text-xs:clamp(.7rem, .9vw, .78rem);--radius-sm:.5rem;--radius-md:.75rem;--radius-lg:1rem;--radius-xl:1.25rem;--radius-2xl:1.5rem;--radius-full:9999px;--space-section:clamp(3rem, 6vw, 5rem);--space-card:clamp(1rem, 2vw, 1.75rem);--transition-fast:.15s ease;--transition-base:.2s ease;--transition-slow:.35s ease;--transition-theme:background-color .35s ease, color .35s ease, border-color .35s ease, box-shadow .35s ease}[data-theme=dark],.dark{--bg-page:#111827;--bg-card:#1f2937;--bg-card-hover:#263348;--bg-sidebar:#111827;--bg-navbar:#111827f2;--bg-input:#1f2937;--bg-input-focus:#263348;--bg-modal:#1f2937;--bg-overlay:#000000b3;--bg-tooltip:#f1f5f9;--bg-badge:#2563eb26;--bg-dark:#111827;--text-primary:#f1f5f9;--text-secondary:#cbd5e1;--text-muted:#94a3b8;--text-placeholder:#64748b;--text-inverse:#0f172a;--text-main:#f1f5f9;--border:#374151;--border-strong:#4b5563;--border-color:#374151;--border-focus:#3b82f6;--shadow-xs:0 1px 2px #0000004d;--shadow-sm:0 1px 3px #0000004d, 0 1px 2px #0003;--shadow-md:0 4px 6px -1px #0006, 0 2px 4px -1px #0000004d;--shadow-lg:0 10px 15px -3px #0006, 0 4px 6px -2px #0000004d;--shadow-xl:0 20px 25px -5px #00000080, 0 10px 10px -5px #0000004d;--shadow-2xl:0 25px 50px -12px #0009;--shadow-card:0 4px 20px -2px #0006;--shadow-nav:0 4px 20px #0006;--shadow-primary:0 8px 25px #2563eb66}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;overflow-x:hidden}body{font-family:var(--font-main);background-color:var(--bg-page);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:var(--transition-theme);-webkit-text-size-adjust:100%;line-height:1.6;overflow-x:hidden}a{color:inherit;transition:color var(--transition-base);text-decoration:none}button{cursor:pointer;outline:none;font-family:inherit}img{max-width:100%;display:block}:focus-visible{outline:2px solid var(--primary);outline-offset:3px;border-radius:var(--radius-sm)}button:focus-visible,a:focus-visible{outline:2px solid var(--primary);outline-offset:3px}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.container{max-width:1280px;margin:0 auto;padding:0 2rem}.flex-center{justify-content:center;align-items:center;display:flex}.flex-between{justify-content:space-between;align-items:center;display:flex}.grid-cards{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:2rem;display:grid}.glass{background:var(--bg-navbar);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border);box-shadow:var(--shadow-nav)}.bg-mesh{background-color:var(--bg-page);background-image:radial-gradient(at 0 0,#2563eb0f 0,#0000 50%),radial-gradient(at 50% 0,#06b6d40a 0,#0000 50%),radial-gradient(at 100% 0,#0ea5e90f 0,#0000 50%);position:relative;overflow:hidden}[data-theme=dark] .bg-mesh{background-image:radial-gradient(at 0 0,#2563eb14 0,#0000 50%),radial-gradient(at 50% 0,#06b6d40d 0,#0000 50%),radial-gradient(at 100% 0,#0ea5e912 0,#0000 50%)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@keyframes slideInFromLeft{0%{opacity:0;transform:translate(-100%)}to{opacity:1;transform:translate(0)}}@keyframes slideInFromRight{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}@keyframes floatSlow{0%{transform:translateY(0)rotate(0)}50%{transform:translateY(-14px)rotate(1deg)}to{transform:translateY(0)rotate(0)}}@keyframes floatCard{0%{transform:translateY(0)}50%{transform:translateY(-8px)}to{transform:translateY(0)}}@keyframes pulseGlow{0%{opacity:.8;transform:scale(.95)}to{opacity:1;transform:scale(1.08)}}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@keyframes spin{to{transform:rotate(360deg)}}.animate-fade-in{animation:.5s cubic-bezier(.16,1,.3,1) forwards fadeIn}.animate-slide-up{animation:.6s cubic-bezier(.16,1,.3,1) forwards slideUp}.animate-float{animation:6s ease-in-out infinite floatSlow}.btn{border-radius:var(--radius-full);cursor:pointer;white-space:nowrap;border:none;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.9rem;font-weight:600;transition:all .25s cubic-bezier(.16,1,.3,1);display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);color:#fff;box-shadow:var(--shadow-primary)}.btn-primary:hover{filter:brightness(1.05);transform:translateY(-2px);box-shadow:0 12px 30px #2563eb66}.btn-primary:active{transform:translateY(0)}.btn-outline{border:1.5px solid var(--border);color:var(--text-primary);background:0 0}.btn-outline:hover{background:var(--text-primary);color:var(--bg-card);border-color:var(--text-primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.btn-ghost{color:var(--text-muted);background:0 0;border:none}.btn-ghost:hover{background:var(--bg-input);color:var(--text-primary)}.btn-icon{border-radius:var(--radius-md);background:var(--bg-input);border:1px solid var(--border);width:38px;height:38px;color:var(--text-muted);transition:all var(--transition-base);justify-content:center;align-items:center;padding:0;display:flex}.btn-icon:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}.card{background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border);box-shadow:var(--shadow-card);padding:1.75rem;transition:all .3s cubic-bezier(.16,1,.3,1)}.card:hover{box-shadow:var(--shadow-xl);border-color:#2563eb33;transform:translateY(-4px)}.card-flat{background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border);padding:1.75rem}.main-layout-wrapper{min-height:100vh;padding-top:var(--navbar-height)!important}.navbar{background:var(--bg-navbar);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border);box-shadow:var(--shadow-nav);transition:var(--transition-theme), box-shadow .3s ease;width:100%!important;height:var(--navbar-height)!important;z-index:1000!important;position:fixed!important;top:0!important;left:0!important;right:0!important}.navbar.scrolled{box-shadow:var(--shadow-lg)}.navbar-brand{color:var(--text-primary);align-items:center;gap:.25rem;font-size:1.35rem;font-weight:800;transition:transform .2s;display:flex}.navbar-brand:hover{transform:scale(1.02)}.navbar-search{width:100%;position:relative}.search-icon{color:var(--text-muted);pointer-events:none;position:absolute;top:50%;left:1rem;transform:translateY(-50%)}.search-input{border-radius:var(--radius-full);background:var(--bg-input);width:100%;color:var(--text-primary);font-size:.9rem;font-family:var(--font-main);border:1.5px solid #0000;outline:none;padding:.6rem 3.5rem .6rem 2.8rem;transition:all .25s}.search-input::placeholder{color:var(--text-placeholder)}.search-input:focus{background:var(--bg-input-focus);border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.main-content-grid{min-height:calc(100vh - var(--navbar-height))!important;display:flex!important;position:relative!important}.sidebar{background:var(--bg-sidebar);border-right:1px solid var(--border);flex-direction:column;transition:width .3s cubic-bezier(.4,0,.2,1),background-color .35s,border-color .35s;display:flex;top:var(--navbar-height)!important;height:calc(100vh - var(--navbar-height))!important;max-height:calc(100vh - var(--navbar-height))!important;z-index:900!important;flex-shrink:0!important;position:fixed!important;bottom:0!important;left:0!important;overflow:hidden auto!important}.sidebar.expanded{width:var(--sidebar-width)!important}.sidebar.collapsed{width:var(--sidebar-collapsed-width)!important}@media (width>=768px){.sidebar.expanded+.main-content-area{margin-left:var(--sidebar-width)!important;width:calc(100% - var(--sidebar-width))!important}.sidebar.collapsed+.main-content-area{margin-left:var(--sidebar-collapsed-width)!important;width:calc(100% - var(--sidebar-collapsed-width))!important}}.main-content-area{transition:margin-left .3s cubic-bezier(.4,0,.2,1),width .3s cubic-bezier(.4,0,.2,1);flex-direction:column!important;flex:1!important;min-width:0!important;display:flex!important}.sidebar-nav{scrollbar-width:thin;scrollbar-color:var(--border) transparent;flex-direction:column;flex:1;gap:.25rem;padding:1rem 0;display:flex;overflow:hidden auto}.sidebar-section-label{color:var(--text-placeholder);text-transform:uppercase;letter-spacing:.08em;white-space:nowrap;padding:.5rem 1.25rem .35rem;font-size:.68rem;font-weight:800;transition:opacity .2s;overflow:hidden}.sidebar.collapsed .sidebar-section-label{opacity:0;pointer-events:none}.sidebar-link{border-radius:var(--radius-lg);color:var(--text-muted);white-space:nowrap;cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:.85rem;width:calc(100% - 1.3rem);margin:.1rem .65rem;padding:.7rem .85rem;font-size:.92rem;font-weight:500;text-decoration:none;transition:all .2s;display:flex;position:relative;overflow:hidden}.sidebar-link:hover{background:var(--bg-input);color:var(--text-primary)}.sidebar-link.active{color:#1d4ed8;background:#eff6ff;border:1px solid #bfdbfe;font-weight:700;box-shadow:0 2px 8px #2563eb14}.sidebar-link.active .link-icon{color:#2563eb}.sidebar-link .link-icon{flex-shrink:0;justify-content:center;align-items:center;width:20px;height:20px;display:flex}.sidebar-link .link-label{text-overflow:ellipsis;flex:1;transition:opacity .2s,width .2s;overflow:hidden}.sidebar.collapsed .link-label{opacity:0;pointer-events:none;width:0}.sidebar-collapse-btn{border-radius:var(--radius-lg);border:1px solid var(--border);background:var(--bg-card);color:var(--text-muted);cursor:pointer;justify-content:center;align-items:center;width:calc(100% - 1.3rem);margin:.5rem .65rem;padding:.75rem;transition:all .2s;display:flex}.sidebar-collapse-btn:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}.sidebar-support-widget{border:1px solid var(--border);border-radius:var(--radius-xl);background:linear-gradient(135deg,#2563eb14 0%,#0ea5e90f 100%);margin:.75rem;padding:1rem;transition:all .3s;overflow:hidden}.sidebar.collapsed .sidebar-support-widget{justify-content:center;margin:.5rem;padding:.6rem;display:flex}.sidebar-support-text{transition:opacity .2s}.sidebar.collapsed .sidebar-support-text{display:none}.sidebar-link[data-tooltip]:hover:after{content:attr(data-tooltip);background:var(--bg-tooltip);color:var(--text-inverse);border-radius:var(--radius-md);white-space:nowrap;pointer-events:none;z-index:200;box-shadow:var(--shadow-lg);padding:.35rem .75rem;font-size:.82rem;font-weight:600;position:absolute;top:50%;left:calc(100% + .75rem);transform:translateY(-50%)}.main-layout-wrapper{background:var(--bg-page);flex-direction:column;min-height:100vh;transition:background-color .35s;display:flex}.main-content-grid{flex:1;min-height:0;display:flex}.main-content-area{flex:1;min-width:0;overflow-x:hidden}.theme-toggle-btn{border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-input);width:38px;height:38px;color:var(--text-muted);cursor:pointer;transition:all var(--transition-base);flex-shrink:0;justify-content:center;align-items:center;display:flex}.theme-toggle-btn:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}.badge{border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.04em;align-items:center;gap:.25rem;padding:.2rem .6rem;font-size:.72rem;font-weight:700;display:inline-flex}.badge-blue{background:var(--primary-light);color:var(--primary)}.badge-red{color:var(--danger);background:#ef44441a}.badge-green{color:var(--success);background:#10b9811a}.badge-yellow{color:var(--warning);background:#f59e0b1a}.form-group{flex-direction:column;gap:.4rem;display:flex}.form-label{color:var(--text-secondary);font-size:.85rem;font-weight:600}.form-input{background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-lg);width:100%;color:var(--text-primary);font-size:.92rem;font-family:var(--font-main);outline:none;padding:.75rem 1rem;transition:all .2s}.form-input::placeholder{color:var(--text-placeholder)}.form-input:focus{background:var(--bg-input-focus);border-color:var(--border-focus);box-shadow:0 0 0 3px var(--primary-light)}.progress-track{background:var(--border);border-radius:var(--radius-full);width:100%;height:6px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);border-radius:var(--radius-full);height:100%;transition:width .5s}.skeleton{background:linear-gradient(90deg, var(--border) 0%, var(--bg-card-hover) 50%, var(--border) 100%);border-radius:var(--radius-md);background-size:200% 100%;animation:1.5s infinite shimmer}.dropdown-menu{background:var(--bg-modal);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-2xl);z-index:200;min-width:200px;padding:.5rem;animation:.15s fadeIn;position:absolute;top:calc(100% + .5rem);right:0}.dropdown-item{border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);text-align:left;background:0 0;border:none;align-items:center;gap:.75rem;width:100%;padding:.6rem .85rem;font-size:.88rem;font-weight:500;display:flex}.dropdown-item:hover{background:var(--bg-input);color:var(--text-primary)}.dropdown-item.danger{color:var(--danger)}.dropdown-item.danger:hover{background:#ef444414}.dropdown-divider{background:var(--border);height:1px;margin:.35rem 0}.modal-overlay{background:var(--bg-overlay);z-index:300;justify-content:center;align-items:center;padding:1rem;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal-content{background:var(--bg-modal);border-radius:var(--radius-2xl);border:1px solid var(--border);width:100%;max-width:500px;box-shadow:var(--shadow-2xl);padding:2rem;animation:.25s slideUp}.tabs-header{border-bottom:1px solid var(--border);gap:0;display:flex}.tab-btn{color:var(--text-muted);font-size:.9rem;font-weight:600;font-family:var(--font-main);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-bottom:2.5px solid #0000;align-items:center;gap:.4rem;padding:.65rem 1rem;transition:all .2s;display:flex}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}.alert{border-radius:var(--radius-lg);border:1px solid;align-items:flex-start;gap:.75rem;padding:1rem 1.25rem;font-size:.9rem;display:flex}.alert-info{color:var(--text-primary);background:#2563eb0f;border-color:#2563eb26}.alert-success{color:var(--text-primary);background:#10b9810f;border-color:#10b98126}.alert-warning{color:var(--text-primary);background:#f59e0b0f;border-color:#f59e0b26}.footer{color:#94a3b8;background-color:#0f172a;border-top:1px solid #ffffff0d;padding:4.5rem 0 2rem}[data-theme=dark] .footer{background-color:#030712;border-top:1px solid #ffffff0a}.footer-title{color:#fff;margin-bottom:1.25rem;font-size:1rem;font-weight:700}.footer-link{color:#94a3b8;margin-bottom:.6rem;font-size:.9rem;transition:all .2s;display:block}.floating-container{justify-content:center;align-items:center;width:100%;height:450px;display:flex;position:relative}.floating-block{border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);background:var(--bg-card);border:1px solid var(--border);align-items:center;gap:.65rem;padding:.85rem 1.25rem;animation:6s ease-in-out infinite floatCard;display:flex;position:absolute}.blob-glow{filter:blur(40px);z-index:0;pointer-events:none;background:radial-gradient(circle,#06b6d426 0%,#0000 70%);border-radius:50%;animation:20s ease-in-out infinite alternate floatSlow;position:absolute}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.lecture-breadcrumb{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:1.5rem;font-size:.85rem;display:flex}.lecture-breadcrumb a{color:var(--primary);font-weight:600}.lecture-breadcrumb a:hover{text-decoration:underline}.lecture-breadcrumb .sep{color:var(--border-strong)}.lecture-video-container{border-radius:var(--radius-xl);aspect-ratio:16/9;box-shadow:var(--shadow-2xl);border:1px solid var(--border);background:#000;position:relative;overflow:hidden}.instructor-card{background:var(--bg-input);border-radius:var(--radius-lg);border:1px solid var(--border);align-items:center;gap:.85rem;padding:.85rem 1.1rem;display:flex}.mark-complete-btn{border-radius:var(--radius-full);cursor:pointer;border:2px solid;align-items:center;gap:.5rem;padding:.65rem 1.25rem;font-size:.88rem;font-weight:700;transition:all .2s;display:flex}.mark-complete-btn.completed{border-color:var(--success);color:var(--success);background:#10b9811a}.mark-complete-btn.incomplete{border-color:var(--border-strong);color:var(--text-muted);background:0 0}.mark-complete-btn.incomplete:hover{border-color:var(--success);color:var(--success);background:#10b9810f}.empty-state{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:.75rem;padding:3rem 1.5rem;display:flex}.empty-state-icon{background:var(--bg-input);border-radius:var(--radius-xl);width:56px;height:56px;color:var(--text-placeholder);justify-content:center;align-items:center;margin-bottom:.5rem;display:flex}@media (width<=1024px){.floating-container{height:300px;margin-top:2rem}.sidebar{top:var(--navbar-height);height:calc(100vh - var(--navbar-height));z-index:90;transition:transform .3s,background-color .35s;position:fixed;left:0;transform:translate(-100%);width:var(--sidebar-width)!important}.sidebar.mobile-open{transform:translate(0)}.main-content-grid{display:block}.desktop-only{display:none!important}}@media (width>=1025px){.mobile-only{display:none!important}}@media (width<=640px){.container{padding:0 1rem}.btn{padding:.65rem 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