@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap";:root{--bg-primary: #0a0e1a;--bg-secondary: #111827;--bg-card: rgba(17, 24, 39, .8);--bg-glass: rgba(255, 255, 255, .05);--bg-glass-hover: rgba(255, 255, 255, .08);--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent-blue: #3b82f6;--accent-blue-glow: rgba(59, 130, 246, .4);--accent-purple: #8b5cf6;--accent-gold: #f59e0b;--accent-gold-glow: rgba(245, 158, 11, .3);--accent-green: #10b981;--accent-red: #ef4444;--gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);--gradient-card: linear-gradient(135deg, rgba(59, 130, 246, .1), rgba(139, 92, 246, .1));--gradient-gold: linear-gradient(135deg, #f59e0b, #d97706);--gradient-blue: linear-gradient(135deg, #3b82f6, #8b5cf6);--gradient-btn: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);--gradient-btn-hover: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--space-3xl: 4rem;--border-glass: 1px solid rgba(255, 255, 255, .1);--border-radius: 12px;--border-radius-lg: 20px;--border-radius-full: 9999px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 20px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .5);--shadow-glow-blue: 0 0 30px rgba(59, 130, 246, .3);--shadow-glow-gold: 0 0 30px rgba(245, 158, 11, .3);--font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 2rem;--font-size-4xl: 2.5rem;--font-size-5xl: 3.5rem;--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-family);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{text-decoration:none;color:inherit}img,video{max-width:100%;display:block}button{cursor:pointer;font-family:var(--font-family);border:none;outline:none}input,select,textarea{font-family:var(--font-family);outline:none}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--space-lg)}.glass-card{background:var(--bg-glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:var(--border-glass);border-radius:var(--border-radius);transition:all var(--transition-base)}.glass-card:hover{background:var(--bg-glass-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:.75rem 1.75rem;font-size:var(--font-size-sm);font-weight:600;border-radius:var(--border-radius);transition:all var(--transition-base);letter-spacing:.025em}.btn-primary{background:var(--gradient-btn);color:#fff;box-shadow:0 4px 15px #3b82f64d}.btn-primary:hover{background:var(--gradient-btn-hover);box-shadow:0 6px 25px #3b82f666;transform:translateY(-1px)}.btn-secondary{background:transparent;color:var(--text-primary);border:var(--border-glass)}.btn-secondary:hover{background:var(--bg-glass)}.btn-gold{background:var(--gradient-gold);color:#0a0e1a;box-shadow:0 4px 15px #f59e0b4d}.btn-gold:hover{box-shadow:0 6px 25px #f59e0b80;transform:translateY(-1px)}.btn-danger{background:var(--accent-red);color:#fff}.btn-danger:hover{background:#dc2626;transform:translateY(-1px)}.btn-sm{padding:.5rem 1rem;font-size:var(--font-size-xs)}.input-field{width:100%;padding:.875rem 1rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:var(--border-radius);color:var(--text-primary);font-size:var(--font-size-base);transition:all var(--transition-base)}.input-field:focus{border-color:var(--accent-blue);box-shadow:0 0 0 3px #3b82f626;background:#ffffff14}.input-field::placeholder{color:var(--text-muted)}.section-title{font-size:var(--font-size-3xl);font-weight:800;text-align:center;margin-bottom:var(--space-md)}.section-subtitle{font-size:var(--font-size-lg);color:var(--text-secondary);text-align:center;margin-bottom:var(--space-3xl);max-width:600px;margin-left:auto;margin-right:auto}.gradient-text{background:var(--gradient-hero);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:#ffffff26;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#ffffff40}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-30px)}to{opacity:1;transform:translate(0)}}@keyframes pulse-glow{0%,to{box-shadow:0 0 20px #3b82f64d}50%{box-shadow:0 0 40px #3b82f680}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes gradient-shift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.animate-fade-in-up{animation:fadeInUp .6s ease-out forwards}.animate-fade-in{animation:fadeIn .5s ease-out forwards}.Toastify__toast{background:var(--bg-secondary)!important;color:var(--text-primary)!important;border:var(--border-glass)!important;border-radius:var(--border-radius)!important}@media(max-width:768px){:root{--font-size-5xl: 2.25rem;--font-size-4xl: 1.875rem;--font-size-3xl: 1.5rem}.container{padding:0 var(--space-md)}}:root{--toastify-color-light: #fff;--toastify-color-dark: #121212;--toastify-color-info: #3498db;--toastify-color-success: #07bc0c;--toastify-color-warning: #f1c40f;--toastify-color-error: hsl(6, 78%, 57%);--toastify-color-transparent: rgba(255, 255, 255, .7);--toastify-icon-color-info: var(--toastify-color-info);--toastify-icon-color-success: var(--toastify-color-success);--toastify-icon-color-warning: var(--toastify-color-warning);--toastify-icon-color-error: var(--toastify-color-error);--toastify-container-width: fit-content;--toastify-toast-width: 320px;--toastify-toast-offset: 16px;--toastify-toast-top: max(var(--toastify-toast-offset), env(safe-area-inset-top));--toastify-toast-right: max(var(--toastify-toast-offset), env(safe-area-inset-right));--toastify-toast-left: max(var(--toastify-toast-offset), env(safe-area-inset-left));--toastify-toast-bottom: max(var(--toastify-toast-offset), env(safe-area-inset-bottom));--toastify-toast-background: #fff;--toastify-toast-padding: 14px;--toastify-toast-min-height: 64px;--toastify-toast-max-height: 800px;--toastify-toast-bd-radius: 6px;--toastify-toast-shadow: 0px 4px 12px rgba(0, 0, 0, .1);--toastify-font-family: sans-serif;--toastify-z-index: 9999;--toastify-text-color-light: #757575;--toastify-text-color-dark: #fff;--toastify-text-color-info: #fff;--toastify-text-color-success: #fff;--toastify-text-color-warning: #fff;--toastify-text-color-error: #fff;--toastify-spinner-color: #616161;--toastify-spinner-color-empty-area: #e0e0e0;--toastify-color-progress-light: linear-gradient(to right, #4cd964, #5ac8fa, #007aff, #34aadc, #5856d6, #ff2d55);--toastify-color-progress-dark: #bb86fc;--toastify-color-progress-info: var(--toastify-color-info);--toastify-color-progress-success: var(--toastify-color-success);--toastify-color-progress-warning: var(--toastify-color-warning);--toastify-color-progress-error: var(--toastify-color-error);--toastify-color-progress-bgo: .2}.Toastify__toast-container{z-index:var(--toastify-z-index);-webkit-transform:translate3d(0,0,var(--toastify-z-index));position:fixed;width:var(--toastify-container-width);box-sizing:border-box;color:#fff;display:flex;flex-direction:column}.Toastify__toast-container--top-left{top:var(--toastify-toast-top);left:var(--toastify-toast-left)}.Toastify__toast-container--top-center{top:var(--toastify-toast-top);left:50%;transform:translate(-50%);align-items:center}.Toastify__toast-container--top-right{top:var(--toastify-toast-top);right:var(--toastify-toast-right);align-items:end}.Toastify__toast-container--bottom-left{bottom:var(--toastify-toast-bottom);left:var(--toastify-toast-left)}.Toastify__toast-container--bottom-center{bottom:var(--toastify-toast-bottom);left:50%;transform:translate(-50%);align-items:center}.Toastify__toast-container--bottom-right{bottom:var(--toastify-toast-bottom);right:var(--toastify-toast-right);align-items:end}.Toastify__toast{--y: 0;position:relative;touch-action:none;width:var(--toastify-toast-width);min-height:var(--toastify-toast-min-height);box-sizing:border-box;margin-bottom:1rem;padding:var(--toastify-toast-padding);border-radius:var(--toastify-toast-bd-radius);box-shadow:var(--toastify-toast-shadow);max-height:var(--toastify-toast-max-height);font-family:var(--toastify-font-family);z-index:0;display:flex;flex:1 auto;align-items:center;word-break:break-word}@media only screen and (max-width:480px){.Toastify__toast-container{width:100vw;left:env(safe-area-inset-left);margin:0}.Toastify__toast-container--top-left,.Toastify__toast-container--top-center,.Toastify__toast-container--top-right{top:env(safe-area-inset-top);transform:translate(0)}.Toastify__toast-container--bottom-left,.Toastify__toast-container--bottom-center,.Toastify__toast-container--bottom-right{bottom:env(safe-area-inset-bottom);transform:translate(0)}.Toastify__toast-container--rtl{right:env(safe-area-inset-right);left:initial}.Toastify__toast{--toastify-toast-width: 100%;margin-bottom:0;border-radius:0}}.Toastify__toast-container[data-stacked=true]{width:var(--toastify-toast-width)}.Toastify__toast--stacked{position:absolute;width:100%;transform:translate3d(0,var(--y),0) scale(var(--s));transition:transform .3s}.Toastify__toast--stacked[data-collapsed] .Toastify__toast-body,.Toastify__toast--stacked[data-collapsed] .Toastify__close-button{transition:opacity 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Toastify__bounceInRight{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(3000px,0,0)}60%{opacity:1;transform:translate3d(-25px,0,0)}75%{transform:translate3d(10px,0,0)}90%{transform:translate3d(-5px,0,0)}to{transform:none}}@keyframes Toastify__bounceOutRight{20%{opacity:1;transform:translate3d(-20px,var(--y),0)}to{opacity:0;transform:translate3d(2000px,var(--y),0)}}@keyframes Toastify__bounceInLeft{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(-3000px,0,0)}60%{opacity:1;transform:translate3d(25px,0,0)}75%{transform:translate3d(-10px,0,0)}90%{transform:translate3d(5px,0,0)}to{transform:none}}@keyframes Toastify__bounceOutLeft{20%{opacity:1;transform:translate3d(20px,var(--y),0)}to{opacity:0;transform:translate3d(-2000px,var(--y),0)}}@keyframes 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Toastify__slideInLeft{0%{transform:translate3d(-110%,0,0);visibility:visible}to{transform:translate3d(0,var(--y),0)}}@keyframes Toastify__slideInUp{0%{transform:translate3d(0,110%,0);visibility:visible}to{transform:translate3d(0,var(--y),0)}}@keyframes Toastify__slideInDown{0%{transform:translate3d(0,-110%,0);visibility:visible}to{transform:translate3d(0,var(--y),0)}}@keyframes Toastify__slideOutRight{0%{transform:translate3d(0,var(--y),0)}to{visibility:hidden;transform:translate3d(110%,var(--y),0)}}@keyframes Toastify__slideOutLeft{0%{transform:translate3d(0,var(--y),0)}to{visibility:hidden;transform:translate3d(-110%,var(--y),0)}}@keyframes Toastify__slideOutDown{0%{transform:translate3d(0,var(--y),0)}to{visibility:hidden;transform:translate3d(0,500px,0)}}@keyframes Toastify__slideOutUp{0%{transform:translate3d(0,var(--y),0)}to{visibility:hidden;transform:translate3d(0,-500px,0)}}.Toastify__slide-enter--top-left,.Toastify__slide-enter--bottom-left{animation-name:Toastify__slideInLeft}.Toastify__slide-enter--top-right,.Toastify__slide-enter--bottom-right{animation-name:Toastify__slideInRight}.Toastify__slide-enter--top-center{animation-name:Toastify__slideInDown}.Toastify__slide-enter--bottom-center{animation-name:Toastify__slideInUp}.Toastify__slide-exit--top-left,.Toastify__slide-exit--bottom-left{animation-name:Toastify__slideOutLeft;animation-timing-function:ease-in;animation-duration:.3s}.Toastify__slide-exit--top-right,.Toastify__slide-exit--bottom-right{animation-name:Toastify__slideOutRight;animation-timing-function:ease-in;animation-duration:.3s}.Toastify__slide-exit--top-center{animation-name:Toastify__slideOutUp;animation-timing-function:ease-in;animation-duration:.3s}.Toastify__slide-exit--bottom-center{animation-name:Toastify__slideOutDown;animation-timing-function:ease-in;animation-duration:.3s}@keyframes 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var(--transition-fast);position:relative}.nav-link:hover{color:var(--text-primary)}.nav-link:after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--gradient-btn);transition:width var(--transition-base)}.nav-link:hover:after{width:100%}.nav-auth{display:flex;gap:var(--space-sm);margin-left:var(--space-md)}.nav-user{display:flex;align-items:center;gap:var(--space-md);margin-left:var(--space-md)}.nav-user-name{display:flex;align-items:center;gap:.35rem;font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500;cursor:pointer;transition:color var(--transition-fast)}.nav-user-name:hover{color:var(--text-primary)}@media(max-width:768px){.menu-toggle{display:block}.navbar-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:#0a0e1af2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);padding:var(--space-lg);gap:var(--space-md);border-bottom:var(--border-glass);animation:fadeInUp .3s 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h4{font-size:var(--font-size-base);font-weight:600;margin-bottom:var(--space-md);color:var(--accent-gold)}.lecture-upload-form form{display:flex;flex-direction:column;gap:var(--space-md)}.admin-lecture-list{margin-top:var(--space-lg);padding-top:var(--space-lg);border-top:var(--border-glass);display:flex;flex-direction:column;gap:var(--space-sm)}.admin-lecture-item{display:flex;align-items:center;gap:var(--space-sm);padding:.75rem;border-radius:8px;background:#ffffff08}.admin-lecture-info{flex:1;display:flex;flex-direction:column}.admin-lecture-title{font-size:var(--font-size-sm);font-weight:600}.admin-lecture-desc{font-size:var(--font-size-xs);color:var(--text-muted)}.no-lectures-msg{font-size:var(--font-size-sm);color:var(--text-muted);padding:var(--space-md) 0}@media(max-width:768px){.dashboard-header{flex-direction:column}.form-row{grid-template-columns:1fr}.admin-course-header{flex-direction:column}.admin-course-actions{width:100%}.admin-course-actions 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