@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--color-bg-primary: #0a0a0f;--color-bg-secondary: #13131a;--color-bg-tertiary: #1c1c24;--color-accent-primary: #6366f1;--color-accent-secondary: #818cf8;--color-accent-success: #10b981;--color-accent-warning: #f59e0b;--color-accent-error: #ef4444;--color-text-primary: #f8f9fa;--color-text-secondary: #9ca3af;--color-text-tertiary: #6b7280;--color-border: #27272f;--color-divider: rgba(255, 255, 255, .05);--font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--leading-tight: 1.25;--leading-normal: 1.5;--leading-relaxed: 1.75;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-6: 1.5rem;--space-8: 2rem;--space-12: 3rem;--space-16: 4rem;--space-24: 6rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .6);--transition-fast: .15s ease-in-out;--transition-base: .25s ease-in-out;--transition-slow: .35s ease-in-out}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-primary);background-color:var(--color-bg-primary);color:var(--color-text-primary);line-height:var(--leading-normal);min-height:100vh}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:var(--leading-tight);color:var(--color-text-primary)}h1{font-size:var(--text-4xl);margin-bottom:var(--space-6)}h2{font-size:var(--text-3xl);margin-bottom:var(--space-4)}h3{font-size:var(--text-2xl);margin-bottom:var(--space-4)}h4{font-size:var(--text-xl);margin-bottom:var(--space-3)}h5{font-size:var(--text-lg);margin-bottom:var(--space-3)}h6{font-size:var(--text-base);margin-bottom:var(--space-2)}p{margin-bottom:var(--space-4);color:var(--color-text-secondary);line-height:var(--leading-relaxed)}a{color:var(--color-accent-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-accent-secondary)}.page-container{width:100%;max-width:1280px;margin:0 auto;padding:0 var(--space-6)}@media(max-width:768px){.page-container{padding:0 var(--space-4)}}.content-wrapper{flex:1;padding:var(--space-8) 0}.navbar{position:sticky;top:0;z-index:1000;background:#0a0a0fcc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border);height:64px}.navbar-container{max-width:1280px;margin:0 auto;padding:0 var(--space-6);height:100%;display:flex;align-items:center;justify-content:space-between}.navbar-brand{font-size:var(--text-xl);font-weight:700;color:var(--color-text-primary);text-decoration:none}.nav-links{display:flex;gap:var(--space-8);align-items:center}.nav-links a{font-size:var(--text-sm);font-weight:500;color:var(--color-text-secondary);text-decoration:none;transition:color var(--transition-fast);position:relative}.nav-links a:hover{color:var(--color-text-primary)}.nav-links a.active{color:var(--color-accent-primary)}.nav-links a.active:after{content:"";position:absolute;bottom:-20px;left:0;right:0;height:2px;background:var(--color-accent-primary)}.hamburger{display:none;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:var(--space-2)}.hamburger span{width:24px;height:2px;background:var(--color-text-primary);transition:all var(--transition-base)}@media(max-width:768px){.hamburger{display:flex}.nav-links{position:fixed;top:64px;right:-100%;width:280px;height:calc(100vh - 64px);background:var(--color-bg-secondary);flex-direction:column;align-items:flex-start;padding:var(--space-8) var(--space-6);gap:var(--space-4);transition:right var(--transition-base);border-left:1px solid var(--color-border)}.nav-links.open{right:0}.nav-links a.active:after{display:none}}button,.btn{font-family:var(--font-primary);font-size:var(--text-sm);font-weight:500;padding:var(--space-3) var(--space-6);border-radius:var(--radius-md);border:none;cursor:pointer;transition:all var(--transition-fast);display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);text-decoration:none}button:disabled,.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-accent-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-accent-secondary);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--color-bg-tertiary);color:var(--color-text-primary);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-bg-secondary);border-color:var(--color-accent-primary)}.btn-logout{background:transparent;color:var(--color-text-secondary);border:1px solid var(--color-border);padding:var(--space-2) var(--space-4)}.btn-logout:hover{color:var(--color-accent-error);border-color:var(--color-accent-error)}.form-card{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-12);width:100%;max-width:420px;box-shadow:var(--shadow-lg)}@media(max-width:768px){.form-card{padding:var(--space-8)}}.form-group{margin-bottom:var(--space-6)}.form-group label{display:block;font-size:var(--text-sm);font-weight:500;color:var(--color-text-primary);margin-bottom:var(--space-2)}.form-group input,.form-group select,.form-group textarea{width:100%;padding:var(--space-3) var(--space-4);background:var(--color-bg-tertiary);border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text-primary);font-family:var(--font-primary);font-size:var(--text-base);transition:all var(--transition-fast)}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--color-accent-primary);box-shadow:0 0 0 3px #6366f11a}.form-group input::placeholder{color:var(--color-text-tertiary)}.form-card button[type=submit]{width:100%;margin-top:var(--space-4)}.card{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition-base)}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--color-accent-primary)}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:var(--space-6);margin-top:var(--space-8)}@media(max-width:768px){.course-grid{grid-template-columns:1fr;gap:var(--space-4)}}.course-card{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition-base);cursor:pointer;text-decoration:none;color:inherit;display:block}.course-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--color-accent-primary)}.course-thumbnail{width:100%;height:180px;object-fit:cover;background:linear-gradient(135deg,var(--color-bg-tertiary) 0%,var(--color-bg-primary) 100%)}.course-content{padding:var(--space-6)}.course-title{font-size:var(--text-lg);font-weight:600;color:var(--color-text-primary);margin-bottom:var(--space-3);display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:var(--leading-tight)}.course-description{font-size:var(--text-sm);color:var(--color-text-secondary);line-height:var(--leading-relaxed);display:-webkit-box;-webkit-line-clamp:3;line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.table-container{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;margin-top:var(--space-6)}table{width:100%;border-collapse:collapse}thead{background:var(--color-bg-tertiary);position:sticky;top:0}th{padding:var(--space-4);text-align:left;font-size:var(--text-sm);font-weight:600;color:var(--color-text-primary);border-bottom:1px solid var(--color-border)}td{padding:var(--space-4);font-size:var(--text-sm);color:var(--color-text-secondary);border-bottom:1px solid var(--color-divider)}tbody tr{transition:background var(--transition-fast)}tbody tr:hover{background:var(--color-bg-tertiary)}@media(max-width:768px){.table-container{overflow-x:auto}th,td{padding:var(--space-3);font-size:var(--text-xs)}}.course-hero{position:relative;height:400px;background:linear-gradient(135deg,var(--color-bg-tertiary) 0%,var(--color-bg-primary) 100%);display:flex;align-items:center;margin-bottom:var(--space-8);overflow:hidden}.course-hero:before{content:"";position:absolute;inset:0;background:linear-gradient(to bottom,transparent 0%,rgba(10,10,15,.9) 100%);z-index:1}.course-hero-content{position:relative;z-index:2;max-width:1280px;margin:0 auto;padding:0 var(--space-6);width:100%}.back-link{display:inline-flex;align-items:center;gap:var(--space-2);font-size:var(--text-sm);color:var(--color-text-secondary);margin-bottom:var(--space-4);transition:color var(--transition-fast)}.back-link:hover{color:var(--color-accent-primary)}.course-hero h1{font-size:var(--text-4xl);margin-bottom:var(--space-4)}.course-hero .description{font-size:var(--text-lg);color:var(--color-text-secondary);max-width:800px}@media(max-width:768px){.course-hero{height:300px}.course-hero h1{font-size:var(--text-2xl)}.course-hero .description{font-size:var(--text-base)}}.module-card{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6);margin-bottom:var(--space-6)}.module-header h3{font-size:var(--text-xl);margin-bottom:var(--space-4)}.clips-list{list-style:none}.clip-item{display:flex;align-items:center;gap:var(--space-4);padding:var(--space-4);border-radius:var(--radius-md);transition:background var(--transition-fast);cursor:pointer}.clip-item:hover{background:var(--color-bg-tertiary)}.play-icon{width:32px;height:32px;background:var(--color-accent-primary);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-size:var(--text-xs);color:#fff;flex-shrink:0}.clip-info{flex:1;display:flex;justify-content:space-between;align-items:center;gap:var(--space-4)}.clip-title{font-size:var(--text-sm);color:var(--color-text-primary);font-weight:500}.clip-duration{font-size:var(--text-xs);color:var(--color-text-tertiary);white-space:nowrap}@media(max-width:768px){.clip-info{flex-direction:column;align-items:flex-start}}.instructor-section{margin-bottom:var(--space-12)}.instructor-card{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6);display:flex;align-items:center;gap:var(--space-6);margin-top:var(--space-4)}.instructor-avatar{width:80px;height:80px;border-radius:var(--radius-full);object-fit:cover;flex-shrink:0}.instructor-info h3{font-size:var(--text-xl);margin-bottom:var(--space-2);color:var(--color-text-primary)}.instructor-workplace{font-size:var(--text-sm);color:var(--color-text-secondary);margin:0}@media(max-width:768px){.instructor-card{flex-direction:column;text-align:center}}.video-group{margin-bottom:var(--space-8)}.group-title{font-size:var(--text-2xl);font-weight:600;color:var(--color-text-primary);margin-bottom:var(--space-6);padding-bottom:var(--space-3);border-bottom:2px solid var(--color-border)}.video-list{display:flex;flex-direction:column;gap:var(--space-4)}.video-item{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;display:flex;gap:var(--space-4);transition:all var(--transition-base);cursor:pointer}.video-item:hover{border-color:var(--color-accent-primary);transform:translate(4px)}.video-thumbnail-wrapper{position:relative;width:240px;height:135px;flex-shrink:0;background:var(--color-bg-tertiary)}.video-thumbnail{width:100%;height:100%;object-fit:cover}.play-overlay{position:absolute;inset:0;background:#0006;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity var(--transition-base)}.video-item:hover .play-overlay{opacity:1}.play-button{width:48px;height:48px;background:var(--color-accent-primary);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;color:#fff;font-size:var(--text-lg)}.video-content{padding:var(--space-4);flex:1;display:flex;flex-direction:column;gap:var(--space-2)}.video-title{font-size:var(--text-lg);font-weight:600;color:var(--color-text-primary);margin:0}.video-description{font-size:var(--text-sm);color:var(--color-text-secondary);line-height:var(--leading-relaxed);margin:0;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.video-id{font-size:var(--text-xs);color:var(--color-text-tertiary);font-family:var(--font-mono, monospace);margin-top:auto}.no-content{text-align:center;color:var(--color-text-secondary);padding:var(--space-12);font-size:var(--text-lg)}@media(max-width:768px){.video-item{flex-direction:column}.video-thumbnail-wrapper{width:100%;height:200px}}.error{color:var(--color-accent-error);font-size:var(--text-sm);margin-top:var(--space-2)}.success{color:var(--color-accent-success);font-size:var(--text-sm);margin-top:var(--space-2)}.text-center{text-align:center}.mt-4{margin-top:var(--space-4)}.mt-6{margin-top:var(--space-6)}.mt-8{margin-top:var(--space-8)}.mb-4{margin-bottom:var(--space-4)}.mb-6{margin-bottom:var(--space-6)}.mb-8{margin-bottom:var(--space-8)}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--space-6)}.login-form h2{text-align:center;margin-bottom:var(--space-8)}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-8);flex-wrap:wrap;gap:var(--space-4)}.page-header h1{margin-bottom:0}@media(max-width:768px){.page-header{flex-direction:column;align-items:flex-start}}.password-requirements{margin-top:var(--space-3);padding:var(--space-4);background:var(--color-bg-tertiary);border:1px solid var(--color-border);border-radius:var(--radius-md)}.requirements-title{font-size:var(--text-sm);font-weight:500;color:var(--color-text-secondary);margin-bottom:var(--space-3)}.requirements-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--space-2)}.requirements-list li{display:flex;align-items:center;gap:var(--space-2);font-size:var(--text-sm);transition:color var(--transition-fast)}.requirements-list li.valid{color:var(--color-accent-success)}.requirements-list li.invalid{color:var(--color-text-tertiary)}.requirements-list li svg{flex-shrink:0}.field-error{display:flex;align-items:center;gap:var(--space-2);margin-top:var(--space-2);font-size:var(--text-sm);color:var(--color-accent-error)}.field-success{display:flex;align-items:center;gap:var(--space-2);margin-top:var(--space-2);font-size:var(--text-sm);color:var(--color-accent-success)}.error{padding:var(--space-3) var(--space-4);background:#ef44441a;border:1px solid var(--color-accent-error);border-radius:var(--radius-md);color:var(--color-accent-error);font-size:var(--text-sm);margin-bottom:var(--space-4)}.user-menu{position:relative}.user-menu-button{display:flex;align-items:center;gap:var(--space-2);background:transparent;border:1px solid var(--color-border);padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.user-menu-button:hover{color:var(--color-text-primary);border-color:var(--color-accent-primary);background:#6366f10d}.user-menu-button svg{flex-shrink:0}.user-menu-button .chevron{transition:transform var(--transition-base)}.user-menu-button .chevron.open{transform:rotate(180deg)}.user-menu-dropdown{position:absolute;top:calc(100% + var(--space-2));right:0;min-width:180px;background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);overflow:hidden;animation:slideDown .2s ease-out;z-index:1000}.user-menu-item{width:100%;display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:transparent;border:none;color:var(--color-text-secondary);font-size:var(--text-sm);font-weight:500;text-align:left;cursor:pointer;transition:all var(--transition-fast)}.user-menu-item:hover{background:var(--color-bg-tertiary);color:var(--color-text-primary)}.user-menu-item.logout-item:hover{background:#ef44441a;color:var(--color-accent-error)}.user-menu-item svg{flex-shrink:0}@media(max-width:768px){.user-menu-dropdown{min-width:160px}}.layout{display:flex;flex-direction:column;min-height:100vh;width:100vw}.top-nav{background-color:#1a1a1a;color:#fff;padding:1rem 0;border-bottom:1px solid #333;position:sticky;top:0;z-index:1000}.nav-container{max-width:1200px;margin:0 auto;padding:0 2rem;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap}.logo{font-size:1.5rem;font-weight:700;color:#fff;text-decoration:none}.nav-links{display:flex;align-items:center;gap:1.5rem}.nav-links a{color:#ccc;text-decoration:none;font-weight:500;transition:color .2s}.nav-links a:hover,.nav-links a.active{color:#fff}.logout-btn{background-color:#d32f2f;padding:.5rem 1rem;margin-left:1rem;margin-top:0}.logout-btn:hover{background-color:#b71c1c}.menu-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:0;margin:0}.content{flex:1;padding:2rem;background-color:#242424}@media(max-width:768px){.menu-toggle{display:block}.nav-links{display:none;width:100%;flex-direction:column;align-items:flex-start;padding-top:1rem;gap:1rem}.nav-links.open{display:flex}.logout-btn{margin-left:0;width:100%}}.custom-select{position:relative;width:100%}.custom-select-trigger{width:100%;display:flex;align-items:center;justify-content:space-between;gap:var(--space-2);padding:var(--space-3) var(--space-4);background:var(--color-bg-tertiary);border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text-primary);font-family:var(--font-primary);font-size:var(--text-base);cursor:pointer;transition:all var(--transition-fast);text-align:left}.custom-select-trigger:hover{border-color:var(--color-accent-primary);background:#6366f10d}.custom-select-trigger:focus{outline:none;border-color:var(--color-accent-primary);box-shadow:0 0 0 3px #6366f11a}.custom-select-value{flex:1;color:var(--color-text-primary)}.custom-select-trigger:hover .custom-select-value:not(.placeholder){color:var(--color-text-primary)}.custom-select-chevron{flex-shrink:0;color:var(--color-text-secondary);transition:transform var(--transition-base),color var(--transition-fast)}.custom-select-chevron.open{transform:rotate(180deg)}.custom-select-trigger:hover .custom-select-chevron{color:var(--color-accent-primary)}.custom-select-dropdown{position:absolute;left:0;right:0;min-width:100%;background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);overflow:hidden;z-index:1000;max-height:240px;overflow-y:auto}.custom-select-dropdown.slide-down{top:calc(100% + var(--space-2));animation:slideDown .2s ease-out}.custom-select-dropdown.slide-up{bottom:calc(100% + var(--space-2));animation:slideUp .2s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.custom-select-option{width:100%;display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:transparent;border:none;color:var(--color-text-secondary);font-size:var(--text-sm);font-weight:500;text-align:left;cursor:pointer;transition:all var(--transition-fast)}.custom-select-option:hover{background:var(--color-bg-tertiary);color:var(--color-text-primary)}.custom-select-option.selected{color:var(--color-accent-primary);background:#6366f11a}.custom-select-option span{flex:1}.custom-select-option svg{flex-shrink:0;color:var(--color-accent-primary)}.custom-select-dropdown::-webkit-scrollbar{width:6px}.custom-select-dropdown::-webkit-scrollbar-track{background:var(--color-bg-tertiary)}.custom-select-dropdown::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}.custom-select-dropdown::-webkit-scrollbar-thumb:hover{background:var(--color-accent-primary)}.keyboard-shortcuts-overlay{position:fixed;inset:0;background:#000c;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.keyboard-shortcuts-modal{background:var(--color-bg-secondary);border-radius:var(--radius-lg);max-width:600px;width:90%;max-height:80vh;overflow:hidden;box-shadow:0 20px 60px #00000080}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-6);border-bottom:1px solid var(--color-border)}.modal-header h2{margin:0;font-size:var(--text-2xl);font-weight:700;color:var(--color-text-primary)}.close-btn{background:transparent;border:none;color:var(--color-text-secondary);cursor:pointer;padding:var(--space-2);border-radius:var(--radius-md);transition:all .2s ease;display:flex;align-items:center;justify-content:center}.close-btn:hover{background:var(--color-bg-tertiary);color:var(--color-text-primary)}.modal-content{padding:var(--space-6);display:grid;gap:var(--space-6);overflow-y:auto;max-height:calc(80vh - 100px)}.modal-content::-webkit-scrollbar{width:8px}.modal-content::-webkit-scrollbar-track{background:var(--color-bg-primary);border-radius:var(--radius-full)}.modal-content::-webkit-scrollbar-thumb{background:var(--color-accent-primary);border-radius:var(--radius-full);transition:background var(--transition-base)}.modal-content::-webkit-scrollbar-thumb:hover{background:#5558d9}.modal-content{scrollbar-width:thin;scrollbar-color:var(--color-accent-primary) 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