:root{--bg-primary: #070809;--bg-secondary: #0d1014;--bg-elevated: #12161d;--bg-hover: #1a1f27;--bg-subtle: #1a1f33;--text-primary: #f8fafc;--text-secondary: #a6b3c6;--text-tertiary: #6b7280;--accent-primary: #4f8bff;--accent-secondary: #8b5cf6;--accent-tertiary: #ec4899;--accent-hover: #3b6fe0;--accent-light: rgba(79, 139, 255, .12);--accent-strong: #7c3aed;--accent: #4f8bff;--primary: #6b9eff;--border-primary: rgba(255, 255, 255, .08);--border-secondary: #334155;--border-hover: rgba(255, 255, 255, .18);--border: #1e293b;--success: #10b981;--success-light: rgba(16, 185, 129, .12);--warning: #f59e0b;--warning-light: rgba(245, 158, 11, .12);--error: #ef4444;--error-light: rgba(239, 68, 68, .12);--surface: #141826;--card-bg: #141826;--nav-bg: #1e293b;--nav-text: #e2e8f0;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--font-sans: "SF Pro Display", "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;--font-mono: "SF Mono", "Menlo", monospace;--font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-heading: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--shadow-sm: 0 1px 2px rgba(0,0,0,.25);--shadow-md: 0 8px 20px rgba(0,0,0,.35);--shadow-lg: 0 18px 40px rgba(0,0,0,.45);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1);--shadow-glow: 0 0 20px rgba(99, 102, 241, .3);--nav-height: 64px;--sidebar-width: 300px;--container-max: 1360px;--transition: all .3s cubic-bezier(.4, 0, .2, 1);--transition-fast: all .15s ease;--z-base: 1;--z-dropdown: 10;--z-sticky: 100;--z-overlay: 999;--z-nav: 1000;--z-modal: 1001}[data-theme=light]{--bg-primary: #f7f9fc;--bg-secondary: #ffffff;--bg-elevated: #f3f4f6;--bg-hover: #e8ecf4;--bg-subtle: #f1f5f9;--text-primary: #111827;--text-secondary: #4b5563;--text-tertiary: #9ca3af;--accent-primary: #2b6fff;--accent-hover: #1d4ed8;--accent-light: rgba(37, 99, 235, .12);--accent: #2563eb;--primary: #3b82f6;--border-primary: #e5e7eb;--border-secondary: #cbd5e1;--border-hover: #cbd5e1;--border: #e2e8f0;--surface: #f8fafc;--card-bg: #ffffff;--nav-bg: #ffffff;--nav-text: #1e293b;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 25px rgba(0, 0, 0, .12)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:radial-gradient(circle at 15% 20%,rgba(79,139,255,.08),transparent 32%),radial-gradient(circle at 80% 0%,rgba(124,58,237,.06),transparent 26%),var(--bg-primary);color:var(--text-primary);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6;min-height:100vh;min-width:320px;overflow-x:hidden}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:700;line-height:1.2;letter-spacing:-.02em;color:var(--text-primary);margin:0 0 var(--spacing-sm)}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.5rem}h4{font-size:1.25rem}h5{font-size:1rem}h6{font-size:.875rem}p{color:var(--text-secondary);line-height:1.7;margin:0 0 var(--spacing-md)}a{color:var(--accent-primary);text-decoration:none;transition:color .2s ease}a:hover{color:var(--accent-hover)}strong{color:var(--accent-primary);font-weight:600}code{background:var(--bg-hover);padding:2px 6px;border-radius:4px;font-family:var(--font-mono);font-size:.9em}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;padding:.9rem 1.6rem;border-radius:var(--radius-lg);font-weight:600;text-decoration:none;border:none;cursor:pointer;transition:var(--transition);font-family:inherit;font-size:1rem}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--accent-primary),var(--accent-strong));color:#fff!important;box-shadow:0 10px 30px #4f8bff47}.btn-primary:hover:not(:disabled){background:linear-gradient(135deg,var(--accent-hover),var(--accent-primary));transform:translateY(-1px);box-shadow:0 18px 36px #4f8bff52}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border-primary)}.btn-secondary:hover:not(:disabled){background:var(--bg-hover);border-color:var(--border-hover)}.card{background:linear-gradient(145deg,var(--bg-secondary),var(--bg-elevated));border:1px solid var(--border-primary);border-radius:20px;padding:var(--spacing-xl);box-shadow:var(--shadow-md);transition:var(--transition);position:relative;overflow:hidden}[data-theme=light] .card{background:var(--card-bg);box-shadow:0 2px 8px #0000000f,0 1px 3px #0000000a}.card:after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 20%,rgba(79,139,255,.12),transparent 35%);opacity:0;transition:var(--transition);pointer-events:none}[data-theme=light] .card:after{background:radial-gradient(circle at 20% 20%,rgba(37,99,235,.08),transparent 35%)}.card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-lg)}[data-theme=light] .card:hover{box-shadow:0 8px 24px #0000001a,0 2px 6px #0000000f}.card:hover:after{opacity:1}.page-header.card:hover{border-color:var(--border-primary);box-shadow:var(--shadow-md)}.page-header.card:hover:after{opacity:0}.container{max-width:var(--container-max);margin:0 auto;padding:0 var(--spacing-xl);width:100%}.content-width{max-width:1180px;margin:0 auto;width:100%}.text-center{text-align:center}.mt-auto{margin-top:auto}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--bg-hover);border-radius:var(--radius-md)}::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}.nav{position:fixed;top:0;left:0;right:0;padding:16px;z-index:var(--z-nav);pointer-events:none}.nav>*{pointer-events:auto}.nav-content{background:#0000001a;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.2);border-radius:16px;padding:12px 20px;display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;box-shadow:0 8px 32px #0000004d}[data-theme=light] .nav-content{background:#ffffff1a}.nav-logo{display:flex;align-items:center;gap:12px;font-size:1.25rem;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-decoration:none;transition:opacity .2s ease;letter-spacing:-.02em;white-space:nowrap}.nav-logo:hover{opacity:.8}.nav-links{display:flex;flex-direction:row;gap:8px;list-style:none;margin:0;padding:0;justify-content:center}.nav-links a{color:#ffffffe6;text-decoration:none;padding:8px 20px;border-radius:8px;cursor:pointer;transition:all .3s ease;font-size:1rem;font-weight:500;white-space:nowrap}[data-theme=light] .nav-links a{color:#000000e6}.nav-links a:hover,.nav-links a.active{background:#ffffff1a;color:#fff!important}.nav-actions{display:flex;align-items:center;gap:1rem;flex-direction:row}.profile-dropdown{position:relative}.profile-trigger{display:flex;align-items:center;gap:.5rem;padding:.625rem 1rem;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);border-radius:12px;color:#ffffffe6;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s}[data-theme=light] .profile-trigger{background:#0000000d;border-color:#0000001a;color:#000000e6}.profile-trigger:hover{background:#ffffff26;border-color:#ffffff4d}.profile-trigger.open .fa-chevron-down{transform:rotate(180deg)}.profile-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:180px;background:#000000f2;border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:.5rem;box-shadow:0 8px 32px #0006;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:var(--z-dropdown)}[data-theme=light] .profile-menu{background:#fffffff2;border-color:#0000001a;box-shadow:0 8px 32px #00000026}.profile-menu button{width:100%;display:flex;align-items:center;gap:.75rem;padding:.75rem 1rem;background:transparent;border:none;border-radius:8px;color:#ffffffe6;font-size:.9rem;font-weight:500;text-align:left;cursor:pointer;transition:all .2s}[data-theme=light] .profile-menu button{color:#000000e6}.profile-menu button:hover{background:#6366f126}.profile-menu .menu-divider{height:1px;background:#ffffff1a;margin:.5rem 0}[data-theme=light] .profile-menu .menu-divider{background:#0000001a}.module-nav-sidebar{position:sticky;top:120px;width:300px;max-height:calc(100vh - 140px);overflow:hidden;padding:0;background:var(--nav-bg);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(99,102,241,.2);border-radius:20px;box-shadow:0 10px 40px #0000004d,inset 0 1px #ffffff1a;margin-right:2rem;flex-shrink:0;display:flex;flex-direction:column;color:var(--nav-text)}.scroll-progress-container{position:absolute;left:0;top:0;bottom:0;width:4px;background:#ffffff0d;border-radius:4px 0 0 4px;overflow:hidden;z-index:10}.scroll-progress-bar{width:100%;background:linear-gradient(180deg,#6366f1,#8b5cf6,#ec4899);box-shadow:0 0 10px #6366f180;transition:height .1s ease-out;border-radius:4px 0 0}.module-nav-content{display:flex;flex-direction:column;gap:0;padding:0;overflow-y:auto;overflow-x:hidden;flex:1}.module-nav-content::-webkit-scrollbar{width:6px}.module-nav-content::-webkit-scrollbar-track{background:#0003;border-radius:3px;margin:4px}.module-nav-content::-webkit-scrollbar-thumb{background:#6366f166;border-radius:3px;transition:background .2s}.module-nav-content::-webkit-scrollbar-thumb:hover{background:#6366f199}.nav-title{font-size:.95rem;font-weight:700;color:#ffffffe6;margin:0;display:flex;align-items:center;gap:.75rem;padding:2rem 1.5rem 1rem 2rem;position:sticky;top:0;background:linear-gradient(145deg,#111827f2,#1f2937f2);z-index:10;border-bottom:1px solid rgba(99,102,241,.1)}.nav-title i{color:#6366f1;font-size:1rem}.nav-sections{display:flex;flex-direction:column;gap:.25rem;padding:1.5rem 1.5rem 2rem 2rem}.nav-section-group{display:flex;flex-direction:column}.nav-section-item{display:flex;align-items:center;gap:.75rem;padding:.875rem 1rem;background:transparent;border:none;border-radius:12px;color:#ffffffb3;font-size:.9rem;font-weight:500;text-align:left;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.nav-section-item:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);transform:scaleY(0);transition:transform .2s cubic-bezier(.4,0,.2,1);border-radius:0 2px 2px 0}.nav-section-item:hover{background:#6366f114;color:#fffffff2;transform:translate(2px)}.nav-section-item:hover:before{transform:scaleY(1)}.nav-section-item.active{background:linear-gradient(90deg,#6366f126,#6366f10d);color:#a5b4fc;font-weight:600}.nav-section-item.active:before{transform:scaleY(1);box-shadow:0 0 8px #6366f180}.nav-section-item .section-title{flex:1;font-size:1rem!important;margin:0!important;line-height:1!important;text-align:left;font-weight:500}.section-toggle{font-size:.75rem;color:#fff6;transition:all .2s;margin-left:auto}.nav-section-item:hover .section-toggle{color:#ffffffb3}.nav-subsections{display:flex;flex-direction:column;gap:.125rem;margin-left:1.5rem;margin-top:.25rem;margin-bottom:.5rem;padding-left:1rem;border-left:1px solid rgba(99,102,241,.2)}.nav-subsection-item{display:flex;align-items:center;gap:.625rem;padding:.625rem .875rem;background:transparent;border:none;border-radius:8px;color:#fff9;font-size:.85rem;font-weight:400;text-align:left;cursor:pointer;transition:all .2s}.nav-subsection-item:hover{background:#6366f126;color:#ffffffd9;transform:translate(2px)}.nav-subsection-item.active{background:#6366f126;color:#c4b5fd;font-weight:500}.subsection-dot{width:4px;height:4px;border-radius:50%;background:#fff6;flex-shrink:0;transition:all .2s}.nav-subsection-item.active .subsection-dot{background:#8b5cf6;box-shadow:0 0 6px #8b5cf699}.nav-actions{display:flex;flex-direction:row;gap:.625rem;padding:.75rem 1rem;border-top:none;margin-top:auto}.nav-action-btn{display:flex;align-items:center;justify-content:center;gap:.75rem;padding:.875rem 1.125rem;background:linear-gradient(135deg,#6366f11a,#8b5cf60d);border:1px solid rgba(99,102,241,.2);border-radius:12px;color:#ffffffe6;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);flex:1 1 auto;min-width:fit-content;white-space:nowrap}.nav-action-btn:hover{background:linear-gradient(135deg,#6366f133,#8b5cf61a);border-color:#6366f166;transform:translateY(-2px);box-shadow:0 6px 20px #6366f133}.video-btn i{color:#ef4444}.flashcard-btn i{color:#10b981}.exam-btn i{color:#f59e0b}.module-detail-with-nav{display:flex;align-items:flex-start;gap:2rem}.module-content-wrapper{flex:1;min-width:0}.home-page,.module-detail-page,.exams-page,.exam-page,.flashcards-page,.videos-page,.planner-page,.analytics-page,.admin-page{padding-top:calc(var(--nav-height) + 2rem);min-height:100vh}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem;background:linear-gradient(135deg,#667eea,#764ba2)}.hamburger,.mobile-menu,.mobile-sections-btn,.mobile-all-sections-btn,.mobile-quick-nav,.mobile-nav-overlay,.mobile-nav-actions{display:none!important}.home-page{padding-top:calc(var(--nav-height) + 8px);min-height:100vh}.hero{padding:var(--spacing-2xl) 0;text-align:center}.hero-title{font-size:clamp(2.5rem,5vw,4rem);font-weight:800;line-height:1.05;margin-bottom:var(--spacing-md);background:linear-gradient(135deg,#fff,#b8c5e5);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{color:var(--text-secondary);max-width:640px;margin:0 auto var(--spacing-xl);font-size:1.1rem}.hero-actions{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap}.stats-section{padding:var(--spacing-xl) 0}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg)}.stat-item{background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:var(--spacing-xl);text-align:center;box-shadow:var(--shadow-sm)}.stat-value{font-size:2rem;font-weight:700;color:var(--accent-primary);margin-bottom:var(--spacing-xs)}.stat-label{color:var(--text-secondary);font-weight:600;font-size:.9rem;text-transform:uppercase;letter-spacing:.04em}.modules-section{padding:var(--spacing-2xl) 0}.section-title{text-align:center;font-size:2.1rem;margin-bottom:var(--spacing-xl)}.modules-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--spacing-lg);width:100%}.module-card .module-header{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.module-card .module-header i{font-size:1.5rem;color:var(--accent-primary)}.module-number{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-weight:800;color:var(--accent-primary);background:var(--accent-light);border:1px solid var(--accent-primary)}.module-card h3{margin:0 0 .35rem;font-size:1.25rem}.module-card p{margin:0;color:var(--text-secondary)}.module-meta{display:flex;gap:var(--spacing-lg);margin-top:var(--spacing-lg);padding-top:var(--spacing-lg);border-top:1px solid var(--border-primary);color:var(--text-secondary);font-weight:600;font-size:.9rem}.module-meta i{color:var(--accent-primary);margin-right:.25rem}.module-actions{display:flex;gap:var(--spacing-sm);margin-top:var(--spacing-lg)}.btn-module,.btn-exam{flex:1;text-align:center;padding:.75rem 1rem;border-radius:var(--radius-md);font-weight:700;text-decoration:none;transition:var(--transition)}.btn-module{background:linear-gradient(135deg,var(--accent-primary),var(--accent-strong));color:#fff;box-shadow:0 10px 26px #4f8bff40}.btn-module:hover{transform:translateY(-1px);box-shadow:0 14px 30px #4f8bff4d}.btn-exam{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border-primary)}.btn-exam:hover{background:var(--bg-hover);border-color:var(--border-hover)}.back-link{display:inline-flex;align-items:center;gap:var(--spacing-sm);color:var(--text-secondary);text-decoration:none;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);transition:var(--transition);margin-bottom:var(--spacing-lg)}.back-link:hover{color:var(--accent-primary);background:var(--bg-elevated)}.module-header-section{margin-bottom:var(--spacing-2xl)}.module-hero{text-align:center;padding:var(--spacing-2xl) 0}.module-icon-large{width:100px;height:100px;border-radius:20px;background:var(--accent-light);border:2px solid var(--accent-primary);display:inline-flex;align-items:center;justify-content:center;margin-bottom:var(--spacing-lg)}.module-icon-large i{font-size:3rem;color:var(--accent-primary)}.module-hero h1{font-size:clamp(2rem,4vw,2.5rem);margin-bottom:var(--spacing-md)}.module-description{font-size:1.2rem;color:var(--text-secondary);max-width:600px;margin:0 auto var(--spacing-xl)}.module-stats{display:flex;gap:var(--spacing-xl);justify-content:center;flex-wrap:wrap}.module-stats .stat{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);background:var(--bg-elevated);border:1px solid var(--border-primary);border-radius:var(--radius-lg);font-weight:600}.module-stats .stat i{color:var(--accent-primary)}.module-content-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--spacing-lg)}.content-card h2{display:flex;align-items:center;gap:var(--spacing-sm);font-size:1.3rem;margin-bottom:var(--spacing-md)}.content-card h2 i{color:var(--accent-primary)}.content-card p{margin-bottom:var(--spacing-lg)}.content-main{max-width:900px;margin:0 auto var(--spacing-2xl)}.content-main h2{display:flex;align-items:center;gap:var(--spacing-sm);font-size:1.8rem;margin-bottom:var(--spacing-xl);padding-bottom:var(--spacing-md);border-bottom:2px solid var(--border-primary)}.content-section{margin-bottom:var(--spacing-2xl);padding-bottom:var(--spacing-2xl);border-bottom:1px solid var(--border-secondary)}.content-section:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.content-body{line-height:1.8;font-size:1.05rem}.content-body h2{font-size:1.4rem;margin-top:var(--spacing-xl);margin-bottom:var(--spacing-md);border-bottom:none;padding-bottom:0}.content-body h3{font-size:1.2rem;margin-top:var(--spacing-lg);margin-bottom:var(--spacing-sm)}.content-body ul,.content-body ol{margin:var(--spacing-md) 0;padding-left:var(--spacing-xl)}.content-body li{margin-bottom:var(--spacing-sm);line-height:1.8}.content-body ul li::marker{color:var(--accent-primary)}.content-body ol li::marker{color:var(--accent-primary);font-weight:700}.content-body table{width:100%;border-collapse:collapse;margin:var(--spacing-lg) 0;border-radius:var(--radius-md);overflow:hidden;box-shadow:0 2px 8px #0000001a}.content-body th,.content-body td{padding:var(--spacing-md);border:1px solid var(--border-primary);text-align:left}.content-body th{background:var(--accent-light);font-weight:700;color:var(--accent-primary);border-bottom:2px solid var(--accent-primary)}.content-body tr:nth-child(2n){background:var(--bg-hover)}.content-body tr:hover{background:var(--accent-light);transition:background .2s ease}.content-body blockquote{border-left:4px solid var(--accent-primary);padding-left:var(--spacing-md);margin:var(--spacing-md) 0;font-style:italic;color:var(--text-secondary)}.login-container{width:100%;max-width:450px}.login-card{padding:3rem}.login-header{text-align:center;margin-bottom:2rem}.login-header 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.container{grid-template-columns:1fr;gap:40px}.hero-title{font-size:2rem}.hero-description{font-size:1rem}.hero-actions{flex-direction:column;align-items:stretch}.hero-button{justify-content:center}.hero-stats{flex-wrap:wrap;gap:20px}.features-grid,.pricing-grid{grid-template-columns:1fr}.pricing-grid-three{grid-template-columns:1fr;max-width:600px}.faq-grid{grid-template-columns:1fr}section{padding:60px 0}.section-title{font-size:2rem}.footer-content{grid-template-columns:1fr;gap:40px}}@media(max-width:768px){.btn{min-height:44px;min-width:44px}.nav-section-item,.nav-subsection-item{min-height:44px}.option{min-height:60px}@media(hover:none){.card:hover{transform:none;box-shadow:var(--shadow-md)}.btn:hover,.nav-section-item:hover{transform:none}}.btn:active,.nav-section-item:active,.nav-subsection-item:active,.option:active{opacity:.8;transform:scale(.98)}}.mobile-theme-toggle{padding:1rem 1.5rem;border-top:1px solid rgba(255,255,255,.1)}[data-theme=light] .mobile-theme-toggle{border-top-color:#0000001a}.theme-toggle-mobile{display:flex;align-items:center;justify-content:center;gap:.75rem;width:100%;padding:.875rem 1rem;background:#6366f11a;border:1px solid rgba(99,102,241,.2);border-radius:12px;color:#ffffffe6;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s ease}[data-theme=light] .theme-toggle-mobile{color:#000000e6;background:#6366f114}.theme-toggle-mobile:hover{background:#6366f133;transform:translateY(-1px)}.theme-toggle-mobile span{font-size:.95rem}