:root{--primary: #2c78c8;--primary-light: #4191e6;--primary-dark: #205fa6;--primary-glow: rgba(44, 120, 200, .28);--accent-green: #029000;--accent-green-light: #17a317;--accent-orange: #f2b24d;--accent-orange-light: #f7c86d;--accent-red: #ff5a57;--accent-red-light: #ff7b77;--accent-purple: #8b5cf6;--accent-cyan: #06b6d4;--bg-base: #edf2f7;--bg-surface: #243445;--bg-elevated: #2c4052;--bg-card: #ffffff;--bg-card-hover: #f3f7fb;--bg-input: #1f2d3b;--bg-overlay: rgba(0, 0, 0, .65);--text-primary: #112031;--text-secondary: #4b5f75;--text-muted: #6c8094;--text-accent: #4191e6;--border-subtle: rgba(17, 32, 49, .08);--border-light: rgba(17, 32, 49, .14);--border-active: rgba(44, 120, 200, .5);--shadow-sm: 0 2px 6px rgba(15, 23, 42, .08);--shadow-md: 0 8px 24px rgba(15, 23, 42, .12);--shadow-lg: 0 18px 48px rgba(15, 23, 42, .16);--shadow-glow: 0 0 24px rgba(44, 120, 200, .18);--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--space-3xl: 64px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-xs: .75rem;--font-sm: .875rem;--font-base: 1rem;--font-lg: 1.125rem;--font-xl: 1.25rem;--font-2xl: 1.5rem;--font-3xl: 1.875rem;--font-4xl: 2.25rem;--font-5xl: 3rem;--sidebar-width: 280px;--header-height: 64px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);background:linear-gradient(180deg,#eef3f8,#e7edf4);color:var(--text-primary);line-height:1.6;min-height:100vh;overflow-x:hidden}a{color:var(--text-accent);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:#21486f}img{max-width:100%;height:auto;display:block}button{font-family:var(--font-family);cursor:pointer;border:none;outline:none;font-size:var(--font-sm)}input,select,textarea{font-family:var(--font-family);font-size:var(--font-base)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}#app{min-height:100vh;display:flex;flex-direction:column}.app-layout{display:flex;min-height:calc(100vh - var(--header-height));margin-top:var(--header-height)}.main-content{flex:1;margin-left:var(--sidebar-width);padding:var(--space-xl);min-height:calc(100vh - var(--header-height));transition:margin-left var(--transition-base);background:#f8fbff}.main-content.no-sidebar{margin-left:0}.main-content.lesson-focus-layout{padding:8px var(--space-lg) var(--space-lg)}.app-header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:var(--bg-surface);border-bottom:1px solid rgba(255,255,255,.06);display:flex;align-items:center;padding:0 var(--space-lg);z-index:100;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#243445f5}.header-logo{display:flex;align-items:center;gap:var(--space-md);cursor:pointer;flex-shrink:0}.header-logo-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--primary),var(--accent-cyan));border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800;color:#fff;box-shadow:var(--shadow-glow)}.header-logo-text{font-size:var(--font-lg);font-weight:700;color:#f8fafc;white-space:nowrap}.header-logo-text span{color:#21486f}.header-search{flex:1;max-width:480px;margin:0 var(--space-xl);position:relative}.header-search input{width:100%;height:40px;background:var(--bg-input);border:1px solid var(--border-light);border-radius:var(--radius-full);padding:0 var(--space-md) 0 42px;color:#f8fafc;transition:all var(--transition-fast)}.header-search input::placeholder{color:#6d849a}.header-search input:focus{border-color:var(--border-active);box-shadow:0 0 0 3px var(--primary-glow);background:#93c5fd1f}.header-search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:#6d849a;font-size:14px;pointer-events:none}.header-right{display:flex;align-items:center;gap:var(--space-md);margin-left:auto}.header-lesson-actions{display:flex;align-items:center;gap:6px;margin-right:2px}.header-lesson-btn{position:relative;border-radius:var(--radius-full);border:1px solid rgba(191,219,254,.72);background:linear-gradient(180deg,#60a5faf2,#3b82f6eb 48%,#1d4ed8f0);color:#21486f;font-size:.75rem;font-weight:700;line-height:1;padding:8px 12px;cursor:pointer;transition:all var(--transition-fast);box-shadow:0 12px 24px #0f172a47,0 4px #164eaad1,inset 0 1px #ffffff57,inset 0 -1px #1e40af66;text-shadow:0 1px 2px rgba(15,23,42,.28)}.header-lesson-btn:before{content:"";position:absolute;inset:1px 1px auto 1px;height:48%;border-radius:inherit;background:linear-gradient(180deg,#ffffff47,#fff0);pointer-events:none}.header-lesson-btn:hover{transform:translateY(-1px);filter:brightness(1.06)}.header-lesson-edit-btn{width:38px;height:38px;padding:0;display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(180deg,#fbbf24fa,#f59e0bf2,#d97706f5);border-color:#fef08acc;box-shadow:0 12px 24px #78350f38,0 4px #b45309d9,inset 0 1px #ffffff59,inset 0 -1px #92400e59}.header-lesson-next-btn{background:linear-gradient(180deg,#60a5fafa,#3b82f6f2 48%,#1d4ed8f5);border-color:#dbeafed1}.header-lesson-exit-btn{background:linear-gradient(180deg,#e2e8f0fa,#bfdbfeeb 48%,#93c5fdf0);border-color:#eff6ffe6;color:#1e3a5f;text-shadow:none;box-shadow:0 12px 24px #0f172a2e,0 4px #60a5fa99,inset 0 1px #ffffff80,inset 0 -1px #60a5fa3d}.header-status-badge{display:flex;align-items:center;gap:var(--space-sm);padding:6px 14px;background:#94a3b82e;border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-full);font-size:var(--font-sm);color:#d9e3ee;box-shadow:inset 0 0 0 1px #ffffff0a}.status-dot{width:8px;height:8px;border-radius:50%;background:var(--accent-green);animation:statusPulse 2s ease-in-out infinite}@keyframes statusPulse{0%,to{opacity:1}50%{opacity:.4}}.header-admin-badge{display:flex;align-items:center;gap:var(--space-xs);padding:6px 14px;background:linear-gradient(135deg,#f59e0b26,#ef44441a);border:1px solid rgba(245,158,11,.3);border-radius:var(--radius-full);font-size:var(--font-sm);font-weight:600;color:var(--accent-orange-light);cursor:pointer;transition:all var(--transition-fast)}.header-admin-badge:hover{border-color:var(--accent-orange);background:#f59e0b33}.app-sidebar{position:fixed;top:var(--header-height);left:0;bottom:0;width:var(--sidebar-width);background:linear-gradient(180deg,#edf4fb,#e4edf7);border-right:1px solid rgba(148,163,184,.16);overflow-y:auto;z-index:50;padding:var(--space-lg) 0;transition:transform var(--transition-base)}.sidebar-section{margin-bottom:var(--space-lg)}.sidebar-section-title{font-size:var(--font-xs);font-weight:600;color:#6f86a0;text-transform:uppercase;letter-spacing:.08em;padding:0 var(--space-lg);margin-bottom:var(--space-sm)}.sidebar-nav-item{display:flex;align-items:center;gap:var(--space-md);padding:10px var(--space-lg);color:#35506a;cursor:pointer;transition:all var(--transition-fast);border-left:3px solid transparent;font-size:var(--font-sm)}.sidebar-nav-item:hover{background:#60a5fa24;color:#223d56}.sidebar-nav-item.active{background:linear-gradient(180deg,#60a5fa33,#3b82f61f);color:#1f5e95;border-left-color:var(--primary)}.sidebar-nav-icon{width:34px;height:34px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0;background:linear-gradient(180deg,#ffffffb8,#dbeafe8c);border:1px solid rgba(148,163,184,.16);box-shadow:inset 0 1px #fffc,0 1px 2px #1e293b0d}.sidebar-nav-item:hover .sidebar-nav-icon{background:linear-gradient(180deg,#ffffffd1,#bfdbfe9e);border-color:#60a5fa3d}.sidebar-nav-item.active .sidebar-nav-icon{background:linear-gradient(180deg,#60a5fa42,#3b82f62e);border-color:#3b82f638;box-shadow:inset 0 1px #ffffff73,0 2px 6px #3b82f61f}.sidebar-nav-label{flex:1;min-width:0}.sidebar-nav-badge{font-size:.72rem;min-width:28px;padding:3px 8px;border-radius:999px;background:linear-gradient(180deg,#ffffffc7,#e2e8f0e6);border:1px solid rgba(148,163,184,.18);color:#5f748b;font-weight:700;text-align:center;box-shadow:inset 0 1px #ffffffd1,0 1px 2px #1e293b0a}.sidebar-nav-item.active .sidebar-nav-badge{background:linear-gradient(180deg,#60a5fa38,#3b82f629);border-color:#3b82f63d;color:#1f5e95}.sidebar-progress{padding:var(--space-md) var(--space-lg);border-top:1px solid rgba(148,163,184,.14);margin-top:var(--space-md)}.sidebar-progress-label{font-size:var(--font-xs);color:#6d849a;margin-bottom:var(--space-sm);display:flex;justify-content:space-between}.sidebar-progress-bar{height:4px;background:#94a3b82e;border-radius:var(--radius-full);overflow:hidden}.sidebar-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-light),var(--accent-green));border-radius:var(--radius-full);transition:width var(--transition-slow)}.access-denied-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg-base);padding:var(--space-xl)}.access-denied-container{width:100%;max-width:480px;text-align:center}.access-denied-icon{width:100px;height:100px;background:linear-gradient(135deg,#ef444426,#f59e0b1a);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;font-size:48px;margin:0 auto var(--space-xl);border:1px solid rgba(239,68,68,.2);animation:lockPulse 3s ease-in-out infinite}@keyframes lockPulse{0%,to{border-color:#ef444433;box-shadow:0 0 #ef444400}50%{border-color:#ef444466;box-shadow:0 0 32px #ef44441a}}.access-denied-title{font-size:var(--font-3xl);font-weight:800;margin-bottom:var(--space-md);background:linear-gradient(135deg,var(--text-primary),var(--text-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.access-denied-text{color:var(--text-secondary);font-size:var(--font-lg);margin-bottom:var(--space-sm)}.access-denied-subtext{color:#667e96;font-size:var(--font-sm)}.home-page{max-width:1100px}.page-header{margin-bottom:var(--space-2xl)}.page-header h1{font-size:var(--font-3xl);font-weight:800;margin-bottom:var(--space-sm);color:#23384e}.page-header p{font-size:var(--font-lg);color:var(--text-secondary)}.welcome-banner{background:linear-gradient(135deg,#2c78c81a,#f2b24d14);border:1px solid rgba(44,120,200,.18);border-radius:var(--radius-xl);padding:var(--space-xl) var(--space-2xl);margin-bottom:var(--space-2xl);display:flex;align-items:center;gap:var(--space-xl)}.welcome-banner-icon{font-size:48px;flex-shrink:0}.welcome-banner h2{font-size:var(--font-2xl);font-weight:700;margin-bottom:var(--space-xs)}.welcome-banner p{color:var(--text-secondary)}.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-md);margin-bottom:var(--space-2xl)}.stat-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:var(--space-lg);text-align:center;transition:all var(--transition-base);box-shadow:var(--shadow-sm)}.stat-card:hover{transform:translateY(-2px);border-color:var(--border-light);box-shadow:var(--shadow-md)}.stat-value{font-size:var(--font-3xl);font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent-orange));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-label{font-size:var(--font-sm);color:#667e96;margin-top:var(--space-xs)}.dashboard-panels{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--space-lg)}.dashboard-panel{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);padding:var(--space-xl);box-shadow:var(--shadow-sm)}.dashboard-panel-primary{background:linear-gradient(135deg,#2c78c81f,#f2b24d14),var(--bg-card);border-color:#2c78c838}.dashboard-panel-label{font-size:var(--font-xs);text-transform:uppercase;letter-spacing:.08em;font-weight:700;color:var(--primary);margin-bottom:var(--space-sm)}.dashboard-panel h3{font-size:var(--font-2xl);font-weight:800;color:#23384e;margin-bottom:var(--space-sm)}.dashboard-panel p{color:var(--text-secondary);margin-bottom:var(--space-lg);max-width:42ch}.dashboard-panel-btn{min-width:220px}.dashboard-preview-note{margin-bottom:var(--space-xl);padding:14px 18px;border-radius:var(--radius-lg);background:linear-gradient(180deg,#f8fbff,#eef5fd);border:1px solid rgba(96,165,250,.18);color:#4d6379;box-shadow:var(--shadow-sm)}.dashboard-preview-note strong{color:#21486f}.modules-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:var(--space-lg)}.module-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);overflow:hidden;cursor:pointer;transition:all var(--transition-base);position:relative;box-shadow:var(--shadow-sm)}.module-card:hover{transform:translateY(-4px);border-color:var(--border-active);background:var(--bg-card-hover);box-shadow:var(--shadow-lg),var(--shadow-glow)}.module-card-header{padding:var(--space-lg) var(--space-lg) 0;display:flex;align-items:flex-start;gap:var(--space-md)}.module-card-icon{width:48px;height:48px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.module-card-header h3{font-size:var(--font-lg);font-weight:700}.module-card-header p{font-size:var(--font-sm);color:#667e96;margin-top:2px}.module-card-body{padding:var(--space-md) var(--space-lg)}.module-card-meta{display:flex;gap:var(--space-lg);font-size:var(--font-sm);color:#667e96}.module-card-meta span{display:flex;align-items:center;gap:4px}.module-card-footer{padding:var(--space-md) var(--space-lg) var(--space-lg)}.module-card-progress{height:4px;background:#dfe7ef;border-radius:var(--radius-full);overflow:hidden}.module-card-progress-fill{height:100%;border-radius:var(--radius-full);transition:width var(--transition-slow)}.module-card-progress-label{font-size:var(--font-xs);color:#667e96;margin-top:var(--space-xs);text-align:right}.module-card.locked{opacity:.5;pointer-events:none}.module-card.locked:after{content:"🔒";position:absolute;top:var(--space-md);right:var(--space-md);font-size:20px}.module-page{max-width:1000px}.module-header{display:flex;align-items:center;gap:var(--space-lg);margin-bottom:var(--space-2xl);padding-bottom:var(--space-xl);border-bottom:1px solid var(--border-subtle);background:#fff;border:1px solid var(--border-subtle);border-radius:var(--radius-xl);padding:var(--space-xl);box-shadow:var(--shadow-sm)}.module-header-icon{width:64px;height:64px;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:28px}.module-header-info h1{font-size:var(--font-3xl);font-weight:800}.module-header-info p{color:var(--text-secondary);margin-top:var(--space-xs)}.module-actions{margin-left:auto;display:flex;gap:var(--space-md)}.btn{display:inline-flex;align-items:center;gap:var(--space-sm);padding:10px 20px;border-radius:var(--radius-md);font-size:var(--font-sm);font-weight:600;transition:all var(--transition-fast)}.btn-primary{background:linear-gradient(180deg,var(--primary-light),var(--primary));color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{background:linear-gradient(180deg,#5aa2ee,var(--primary));transform:translateY(-1px);box-shadow:var(--shadow-md),var(--shadow-glow)}.btn-secondary{background:#f8fbff;border:1px solid var(--border-light);color:var(--text-secondary)}.btn-secondary:hover{border-color:var(--border-active);color:var(--text-primary);background:#edf5ff}.lessons-list{display:flex;flex-direction:column;gap:var(--space-sm)}.lesson-item{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm)}.lesson-item:hover{border-color:var(--border-active);background:var(--bg-card-hover);transform:translate(4px)}.lesson-item.completed{border-left:3px solid var(--accent-green)}.lesson-number{width:32px;height:32px;border-radius:50%;background:#edf5ff;display:flex;align-items:center;justify-content:center;font-size:var(--font-sm);font-weight:700;color:var(--primary);flex-shrink:0}.lesson-item.completed .lesson-number{background:#10b98126;color:var(--accent-green)}.lesson-item.next-lesson-focus{border-color:#60a5fabf;box-shadow:0 0 0 1px #60a5fa33,0 0 24px #2563eb2e;animation:nextLessonPulse 1.8s ease-in-out 3}.lesson-info{flex:1}.lesson-info h4{font-size:var(--font-base);font-weight:600}.lesson-info p{font-size:var(--font-sm);color:#667e96}.lesson-duration{font-size:var(--font-sm);color:#667e96;flex-shrink:0}.lesson-arrow{color:#667e96;transition:transform var(--transition-fast)}.lesson-item:hover .lesson-arrow{transform:translate(4px);color:#21486f}.lesson-page{width:100%;max-width:none}.lesson-nav{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;margin-bottom:2px;flex-wrap:nowrap}.lesson-nav-main{display:flex;align-items:flex-start;justify-content:flex-start;min-width:0;flex:1 1 auto}.lesson-step-header{display:none}.lesson-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:6px;font-size:.6875rem;line-height:1.1;color:#667e96;opacity:.8}.lesson-breadcrumb a{color:#667e96}.lesson-breadcrumb a:hover{color:var(--text-accent)}.lesson-breadcrumb .separator{color:#667e96}.lesson-exit-btn{flex-shrink:0;padding:8px 12px;border-color:var(--border-active);color:var(--text-primary);background:#2563eb14}.lesson-nav-actions{display:none}.lesson-edit-btn{width:34px;height:34px;flex-shrink:0}.lesson-next-btn{flex-shrink:0;padding:8px 12px;font-size:var(--font-xs)}.lesson-exit-btn:hover{background:#2563eb2e;color:var(--text-primary);transform:translateY(-1px)}.lesson-title-bar{margin-bottom:var(--space-xl)}.lesson-title-bar h1{font-size:var(--font-2xl);font-weight:800;margin-bottom:var(--space-xs)}.lesson-title-bar .lesson-meta{display:flex;gap:var(--space-lg);font-size:var(--font-sm);color:#667e96}.immersive-lesson .lesson-title-bar{display:none}.immersive-lesson .lesson-nav{margin-bottom:0;min-height:0}.immersive-lesson .lesson-bottom-nav{display:none}#immersive-player-root{display:flex;flex-direction:column;width:100%;height:calc(100vh - 122px);min-height:0;margin-top:0;border-radius:var(--radius-xl);overflow:hidden;box-shadow:0 10px 40px #00000080;background:var(--bg-card);border:1px solid var(--border-light)}.immersive-player-container{display:flex;flex-direction:column;height:100%;position:relative;min-height:0}.immersive-viewport{flex:1;position:relative;display:flex;align-items:center;justify-content:center;background:linear-gradient(180deg,#000000e6,#0f1117);overflow:hidden;padding:6px}.immersive-stage{position:relative;display:flex;flex-direction:column;align-items:center;gap:0;width:fit-content;max-width:100%;max-height:100%;flex:0 0 auto}.immersive-image-wrapper{position:relative;display:block;box-shadow:var(--shadow-lg);border-radius:var(--radius-md);overflow:hidden;width:fit-content;max-width:100%;background:#000;line-height:0;flex:0 0 auto}.immersive-image-wrapper img{width:auto;height:auto;max-width:min(100%,2480px);max-height:calc(100vh - 8px);display:block;object-fit:contain}#immersive-player-root.image-size-fit .immersive-image-wrapper img{max-width:min(100%,2480px);max-height:calc(100vh - 8px)}#immersive-player-root.image-size-adaptive .immersive-stage,#immersive-player-root.image-size-large .immersive-stage{width:100%;display:flex;justify-content:center}#immersive-player-root.image-size-large .immersive-image-wrapper{width:min(140vw,3000px);max-width:min(140vw,3000px)}#immersive-player-root.image-size-large .immersive-image-wrapper img{width:100%;max-width:none;max-height:calc(100vh - 8px);height:auto}#immersive-player-root.image-size-zoom .immersive-stage{width:100%}#immersive-player-root.image-size-zoom .immersive-image-wrapper{width:min(110vw,2048px);max-width:min(110vw,2048px)}#immersive-player-root.image-size-zoom .immersive-image-wrapper img{width:100%;max-width:none;max-height:calc(100vh - 8px);height:auto}.immersive-stage-nav{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:13}.subtitle-step-counter{font-size:var(--font-xs);color:#21486f;text-transform:uppercase;letter-spacing:1px;font-weight:700;margin-bottom:1px}.subtitle-text{font-size:var(--font-base);color:var(--text-primary);line-height:1.5;margin:0}.immersive-caption-panel{position:relative;width:min(84%,1120px);padding:10px 18px;border-radius:var(--radius-lg);background:linear-gradient(180deg,#0a0c12e0,#0a0c1294);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.14);box-shadow:var(--shadow-md);text-align:center;z-index:12}.lesson-header-caption{width:min(100%,680px);padding:7px 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