:root{--bg-primary: #0a0a0a;--bg-secondary: #111111;--bg-card: #161616;--bg-card-hover: #1c1c1c;--bg-input: #1a1a1a;--bg-overlay: rgba(0, 0, 0, .6);--gold: #c9a84c;--gold-light: #d4b96a;--gold-dark: #a88a3a;--gold-muted: rgba(201, 168, 76, .15);--gold-glow: rgba(201, 168, 76, .3);--text-primary: #f5f5f5;--text-secondary: #a0a0a0;--text-muted: #666666;--border: #222222;--border-light: #2a2a2a;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--info: #3b82f6;--font-heading: "Playfair Display", Georgia, "Times New Roman", serif;--font-body: "Raleway", "Helvetica Neue", Arial, sans-serif;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--shadow-gold: 0 0 20px rgba(201, 168, 76, .15);--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease;--navbar-height: 64px;--sidebar-width: 260px}*,*:before,*:after{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-body);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh}a{color:inherit;text-decoration:none}button{font-family:var(--font-body);cursor:pointer;border:none;background:none;color:inherit}input{font-family:var(--font-body);color:var(--text-primary)}ul,ol{list-style:none}img{max-width:100%;display:block}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:600;line-height:1.3}.gold-text{color:var(--gold)}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;background:var(--bg-primary);gap:16px}.loading-spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--gold);border-radius:50%;animation:spin .8s linear infinite}.loading-text{color:var(--text-secondary);font-size:.875rem;letter-spacing:.1em;text-transform:uppercase}@keyframes spin{to{transform:rotate(360deg)}}.app{min-height:100vh;display:flex;flex-direction:column}.app-body{display:flex;flex:1;padding-top:var(--navbar-height)}.app-body.auth-layout{padding-top:0}.main-content{flex:1;padding:32px;margin-left:var(--sidebar-width);min-height:calc(100vh - var(--navbar-height));transition:margin-left var(--transition-base)}.main-content.auth-main{margin-left:0;padding:0}.navbar{position:fixed;top:0;left:0;right:0;height:var(--navbar-height);background:var(--bg-secondary);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;z-index:1000;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#111111eb}.navbar-left{display:flex;align-items:center;gap:16px}.sidebar-toggle{display:none;width:36px;height:36px;align-items:center;justify-content:center;border-radius:var(--radius-sm);transition:background var(--transition-fast)}.sidebar-toggle:hover{background:var(--bg-card)}.hamburger{display:flex;flex-direction:column;gap:5px;width:20px}.hamburger-line{display:block;width:100%;height:2px;background:var(--text-primary);border-radius:1px;transition:transform var(--transition-base),opacity var(--transition-base)}.hamburger.open .hamburger-line:nth-child(1){transform:translateY(7px) rotate(45deg)}.hamburger.open .hamburger-line:nth-child(2){opacity:0}.hamburger.open .hamburger-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.navbar-logo{display:flex;align-items:center;gap:10px;text-decoration:none}.logo-dv{font-family:var(--font-heading);font-size:1.25rem;font-weight:700;color:var(--gold);background:var(--gold-muted);width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);border:1px solid var(--gold-dark);letter-spacing:.05em}.logo-text{font-family:var(--font-heading);font-size:1.1rem;font-weight:500;color:var(--text-primary);letter-spacing:.02em}.navbar-links{display:flex;align-items:center;gap:8px}.nav-link{padding:8px 16px;font-size:.875rem;font-weight:500;color:var(--text-secondary);border-radius:var(--radius-sm);transition:color var(--transition-fast),background var(--transition-fast);letter-spacing:.02em}.nav-link:hover{color:var(--text-primary);background:var(--bg-card)}.navbar-right,.navbar-user{display:flex;align-items:center;gap:12px}.user-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--gold-dark),var(--gold));display:flex;align-items:center;justify-content:center;font-size:.875rem;font-weight:600;color:var(--bg-primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;font-size:.875rem;font-weight:600;border-radius:var(--radius-sm);transition:all var(--transition-fast);letter-spacing:.02em;white-space:nowrap}.btn-sm{padding:6px 14px;font-size:.8125rem}.btn-full{width:100%;padding:12px 20px}.btn-gold{background:linear-gradient(135deg,var(--gold-dark),var(--gold));color:var(--bg-primary);border:1px solid var(--gold)}.btn-gold:hover{background:linear-gradient(135deg,var(--gold),var(--gold-light));box-shadow:var(--shadow-gold);transform:translateY(-1px)}.btn-gold:active{transform:translateY(0)}.btn-gold:disabled{opacity:.6;cursor:not-allowed;transform:none;box-shadow:none}.btn-outline{background:transparent;color:var(--text-primary);border:1px solid var(--border-light)}.btn-outline:hover{border-color:var(--gold);color:var(--gold)}.btn-outline:disabled{opacity:.5;cursor:not-allowed}.btn-loading{display:flex;align-items:center;gap:8px}.btn-spinner{width:16px;height:16px;border:2px solid transparent;border-top-color:currentColor;border-radius:50%;animation:spin .6s linear infinite}.sidebar{position:fixed;top:var(--navbar-height);left:0;bottom:0;width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:900;overflow-y:auto;transition:transform var(--transition-base)}.sidebar-overlay{display:none}.sidebar-header{padding:20px 20px 12px}.sidebar-title{font-size:.6875rem;font-weight:600;text-transform:uppercase;letter-spacing:.12em;color:var(--text-muted)}.sidebar-nav{display:flex;flex-direction:column;gap:2px;padding:0 12px}.sidebar-link{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition-fast)}.sidebar-link:hover{color:var(--text-primary);background:var(--bg-card)}.sidebar-link.active{color:var(--gold);background:var(--gold-muted)}.sidebar-icon{width:20px;height:20px;flex-shrink:0}.sidebar-footer{margin-top:auto;padding:20px}.sidebar-divider{height:1px;background:var(--border);margin-bottom:16px}.sidebar-brand{display:flex;flex-direction:column;gap:2px}.sidebar-brand-text{font-family:var(--font-heading);font-size:.9rem;font-weight:600;color:var(--gold)}.sidebar-brand-sub{font-size:.75rem;color:var(--text-muted)}.progress-bar-container{display:flex;align-items:center;gap:10px;width:100%}.progress-sm .progress-track{height:4px}.progress-md .progress-track{height:8px}.progress-lg .progress-track{height:12px}.progress-label{font-size:.8125rem;color:var(--text-secondary);white-space:nowrap}.progress-track{flex:1;background:var(--bg-input);border-radius:20px;overflow:hidden;position:relative}.progress-fill{height:100%;background:linear-gradient(90deg,var(--gold-dark),var(--gold));border-radius:20px;position:relative;transition:width var(--transition-slow);min-width:0}.progress-glow{position:absolute;top:0;right:0;bottom:0;width:20px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3));border-radius:0 20px 20px 0}.progress-percent{font-size:.8125rem;font-weight:600;color:var(--gold);min-width:36px;text-align:right}.lesson-card{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition-base);text-decoration:none}.lesson-card:hover{border-color:var(--gold-dark);background:var(--bg-card-hover);transform:translateY(-4px);box-shadow:var(--shadow-lg),var(--shadow-gold)}.lesson-card-thumbnail{position:relative;aspect-ratio:16 / 9;background:linear-gradient(135deg,#1a1a1a,#252525);overflow:hidden}.lesson-card-image{width:100%;height:100%;object-fit:cover}.lesson-card-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#141414,#1e1e1e)}.lesson-card-camera-icon{width:48px;height:48px;color:var(--text-muted);opacity:.4}.lesson-card-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(to top,rgba(0,0,0,.7),transparent 50%);pointer-events:none}.lesson-card-duration{position:absolute;bottom:10px;right:10px;display:flex;align-items:center;gap:4px;padding:4px 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var(--border);border-radius:var(--radius-md);padding:20px;display:flex;flex-direction:column;gap:4px;transition:border-color var(--transition-fast)}.stat-card:hover{border-color:var(--border-light)}.stat-number{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--gold)}.stat-label{font-size:.8125rem;color:var(--text-secondary);font-weight:500}.dashboard-section{margin-bottom:40px}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.section-title{font-family:var(--font-heading);font-size:1.375rem;font-weight:600}.section-link{font-size:.875rem;font-weight:500;color:var(--gold);transition:color var(--transition-fast)}.section-link:hover{color:var(--gold-light)}.courses-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.course-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:all 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50%,rgba(201,168,76,.06) 0%,transparent 50%),radial-gradient(ellipse at 80% 20%,rgba(201,168,76,.04) 0%,transparent 50%),var(--bg-primary)}.auth-container{width:100%;max-width:420px;display:flex;flex-direction:column;gap:32px}.auth-brand{text-align:center}.auth-logo{display:inline-flex;align-items:center;justify-content:center;margin-bottom:24px}.auth-logo-dv{font-family:var(--font-heading);font-size:1.75rem;font-weight:700;color:var(--gold);background:var(--gold-muted);width:64px;height:64px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);border:1px solid var(--gold-dark);box-shadow:var(--shadow-gold);letter-spacing:.05em}.auth-title{font-family:var(--font-heading);font-size:1.75rem;font-weight:700;margin-bottom:8px}.auth-subtitle{font-size:.9375rem;color:var(--text-secondary);line-height:1.5}.auth-form{display:flex;flex-direction:column;gap:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px}.auth-error{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;background:#ef44441a;border:1px solid rgba(239,68,68,.25);border-radius:var(--radius-sm);font-size:.8125rem;color:#f87171}.auth-error-icon{width:18px;height:18px;flex-shrink:0;margin-top:1px}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:.8125rem;font-weight:600;color:var(--text-secondary);letter-spacing:.02em}.input-wrapper{position:relative;display:flex;align-items:center}.input-icon{position:absolute;left:14px;width:18px;height:18px;color:var(--text-muted);pointer-events:none}.form-input{width:100%;padding:11px 14px 11px 42px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.9375rem;color:var(--text-primary);transition:border-color var(--transition-fast),box-shadow 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var(--transition-fast)}.auth-footer-link:hover{color:var(--gold-light)}.auth-decoration{display:flex;align-items:center;gap:16px}.auth-line{flex:1;height:1px;background:var(--border)}.auth-decoration-text{font-size:.6875rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.12em;white-space:nowrap}.lessons-toolbar{display:flex;flex-direction:column;gap:16px;margin-bottom:28px}.search-bar{position:relative;max-width:400px}.search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--text-muted);pointer-events:none}.search-input{width:100%;padding:10px 14px 10px 42px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.875rem;color:var(--text-primary);outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.search-input::placeholder{color:var(--text-muted)}.search-input:focus{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-muted)}.category-filters{display:flex;gap:8px;flex-wrap:wrap}.category-btn{padding:6px 16px;font-size:.8125rem;font-weight:500;color:var(--text-secondary);background:var(--bg-card);border:1px solid var(--border);border-radius:20px;transition:all var(--transition-fast)}.category-btn:hover{color:var(--text-primary);border-color:var(--border-light)}.category-btn.active{color:var(--bg-primary);background:var(--gold);border-color:var(--gold)}.lessons-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center}.empty-icon{width:48px;height:48px;color:var(--text-muted);margin-bottom:16px;opacity:.5}.empty-title{font-family:var(--font-heading);font-size:1.25rem;font-weight:600;margin-bottom:8px;color:var(--text-secondary)}.empty-text{font-size:.875rem;color:var(--text-muted)}.lesson-detail{max-width:1100px}.lesson-detail-header{margin-bottom:32px;display:flex;flex-direction:column;gap:16px}.back-link{display:inline-flex;align-items:center;gap:8px;font-size:.875rem;color:var(--text-secondary);transition:color var(--transition-fast)}.back-link:hover{color:var(--gold)}.back-link svg{width:18px;height:18px}.lesson-detail-meta{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.lesson-detail-badge{padding:4px 14px;font-size:.75rem;font-weight:600;color:var(--gold);background:var(--gold-muted);border:1px solid rgba(201,168,76,.3);border-radius:20px;text-transform:uppercase;letter-spacing:.06em}.lesson-detail-duration,.lesson-detail-instructor{display:flex;align-items:center;gap:6px;font-size:.8125rem;color:var(--text-secondary)}.meta-icon{width:16px;height:16px}.lesson-detail-title{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--text-primary);line-height:1.3}.lesson-detail-body{display:grid;grid-template-columns:1fr 320px;gap:32px;align-items:start}.lesson-detail-main{display:flex;flex-direction:column;gap:28px}.lesson-video-area{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border)}.lesson-video-placeholder{aspect-ratio:16 / 9;background:linear-gradient(135deg,#111,#1a1a1a);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px}.play-icon-large{width:64px;height:64px;color:var(--gold);opacity:.7}.video-placeholder-text{font-size:.875rem;color:var(--text-muted)}.lesson-section-heading{font-family:var(--font-heading);font-size:1.25rem;font-weight:600;margin-bottom:12px;color:var(--text-primary)}.lesson-description-text{font-size:.9375rem;color:var(--text-secondary);line-height:1.7}.objectives-list{display:flex;flex-direction:column;gap:12px}.objective-item{display:flex;align-items:flex-start;gap:10px;font-size:.9375rem;color:var(--text-secondary);line-height:1.5}.objective-icon{width:20px;height:20px;color:var(--gold);flex-shrink:0;margin-top:2px}.lesson-detail-sidebar{position:sticky;top:calc(var(--navbar-height) + 32px)}.lesson-sections-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}.sections-card-title{font-family:var(--font-heading);font-size:1rem;font-weight:600;padding:18px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.sections-count{font-family:var(--font-body);font-size:.75rem;font-weight:500;color:var(--text-muted);background:var(--bg-input);padding:3px 10px;border-radius:12px}.sections-list{display:flex;flex-direction:column}.section-item{display:flex;align-items:center;gap:14px;padding:14px 20px;border-bottom:1px solid var(--border);transition:background var(--transition-fast);cursor:pointer}.section-item:last-child{border-bottom:none}.section-item:hover{background:var(--bg-card-hover)}.section-item.completed{opacity:.7}.section-item-left{position:relative;width:28px;height:28px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.section-number{font-size:.75rem;font-weight:600;color:var(--text-muted);position:absolute}.section-item.completed .section-number{display:none}.section-check{width:20px;height:20px;color:var(--success)}.section-item:not(.completed) .section-check{display:none}.section-play{width:16px;height:16px;color:var(--text-muted);display:none}.section-item:not(.completed):hover .section-number{display:none}.section-item:not(.completed):hover .section-play{display:block;color:var(--gold)}.section-item-content{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}.section-item-title{font-size:.875rem;font-weight:500;color:var(--text-primary)}.section-item-duration{font-size:.75rem;color:var(--text-muted)}.assignments-filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px}.assignments-list{display:flex;flex-direction:column;gap:16px}.assignment-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;transition:border-color var(--transition-fast)}.assignment-card:hover{border-color:var(--border-light)}.assignment-card.status-graded{border-left:3px solid var(--success)}.assignment-card.status-submitted{border-left:3px solid var(--info)}.assignment-card.status-in-progress{border-left:3px solid var(--gold)}.assignment-card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;flex-wrap:wrap;gap:8px}.assignment-card-left{display:flex;align-items:center;gap:8px}.assignment-status-badge{padding:4px 12px;font-size:.6875rem;font-weight:600;border-radius:20px;text-transform:uppercase;letter-spacing:.06em}.assignment-status-badge.status-not-started{color:var(--text-muted);background:var(--bg-input);border:1px solid var(--border)}.assignment-status-badge.status-in-progress{color:var(--gold);background:var(--gold-muted);border:1px solid rgba(201,168,76,.3)}.assignment-status-badge.status-submitted{color:var(--info);background:#3b82f61a;border:1px solid rgba(59,130,246,.3)}.assignment-status-badge.status-graded{color:var(--success);background:#10b9811a;border:1px solid rgba(16,185,129,.3)}.assignment-category-badge{padding:4px 12px;font-size:.6875rem;font-weight:600;color:var(--text-secondary);background:var(--bg-input);border-radius:20px;border:1px 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rgba(16,185,129,.15);border-radius:var(--radius-md);padding:16px}.assignment-grade{display:flex;align-items:center;gap:8px;margin-bottom:8px}.grade-label{font-size:.8125rem;color:var(--text-secondary);font-weight:500}.grade-value{font-family:var(--font-heading);font-size:1.25rem;font-weight:700;color:var(--success)}.assignment-feedback{font-size:.8125rem;color:var(--text-secondary);line-height:1.6;font-style:italic}.assignment-actions{display:flex;gap:8px}.resources-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:20px}.resource-card{display:flex;gap:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;transition:all var(--transition-base)}.resource-card:hover{border-color:var(--border-light);transform:translateY(-2px);box-shadow:var(--shadow-md)}.resource-card-icon{width:48px;height:48px;background:var(--gold-muted);border:1px solid rgba(201,168,76,.2);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.resource-card-icon svg{width:24px;height:24px;color:var(--gold)}.resource-card-content{display:flex;flex-direction:column;gap:8px;flex:1;min-width:0}.resource-card-header{display:flex;gap:8px}.resource-type-badge,.resource-category-badge{padding:2px 10px;font-size:.6875rem;font-weight:600;border-radius:12px;text-transform:uppercase;letter-spacing:.04em}.resource-type-badge{color:var(--gold);background:var(--gold-muted);border:1px solid rgba(201,168,76,.25)}.resource-category-badge{color:var(--text-secondary);background:var(--bg-input);border:1px solid var(--border)}.resource-card-title{font-family:var(--font-heading);font-size:1rem;font-weight:600;color:var(--text-primary);line-height:1.4}.resource-card-desc{font-size:.8125rem;color:var(--text-secondary);line-height:1.5}.resource-card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:4px}.resource-size{font-size:.75rem;color:var(--text-muted)}.resource-download-btn{text-decoration:none}.download-icon{width:14px;height:14px}@media(max-width:1100px){.lesson-detail-body{grid-template-columns:1fr}.lesson-detail-sidebar{position:static}.dashboard-two-col{grid-template-columns:1fr}}@media(max-width:900px){.courses-grid,.dashboard-stats{grid-template-columns:repeat(2,1fr)}.navbar-links{display:none}.sidebar-toggle{display:flex}.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:850;opacity:0;pointer-events:none;transition:opacity var(--transition-base)}.sidebar-overlay.visible{opacity:1;pointer-events:auto}.main-content{margin-left:0;padding:24px 16px}.instructor-dashboard .page-header>div{flex-direction:column!important}.category-filters{overflow-x:auto;flex-wrap:nowrap;-webkit-overflow-scrolling:touch;scrollbar-width:none}.category-filters::-webkit-scrollbar{display:none}.category-btn{white-space:nowrap;flex-shrink:0}.lesson-card,.sidebar-link,button{min-height:44px}}@media(max-width:640px){.courses-grid{grid-template-columns:1fr}.dashboard-stats{grid-template-columns:repeat(2,1fr)}.dashboard-greeting,.page-title{font-size:1.5rem}.lessons-grid,.resources-grid{grid-template-columns:1fr}.resource-card{flex-direction:column;gap:16px}.upcoming-lessons-grid .lesson-card{flex-direction:column}.upcoming-lessons-grid .lesson-card-thumbnail{width:100%;aspect-ratio:16 / 9}.lesson-detail-title{font-size:1.5rem}.auth-form{padding:20px}.stat-card{padding:16px}.stat-number{font-size:1.5rem}.logo-text{font-size:.7rem!important}input,select,textarea{font-size:16px!important}}