:root{--primary-color:#ff6b35;--secondary-color:#e63946;--accent-color:#ff6b35;--background-color:#1a1a1a;--surface-color:#2d1b1b;--text-primary:#fff;--text-secondary:#ccc;--border-color:#333;--success-color:#4ade80;--error-color:#ef4444;--warning-color:#f59e0b;--quiz-correct:#10b981;--quiz-incorrect:#ef4444;--quiz-neutral:#ff6b35;--font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","Roboto",sans-serif;--font-size-xs:0.75rem;--font-size-sm:0.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:1.875rem;--font-size-4xl:2.25rem;--font-size-5xl:3rem;--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--border-radius-sm:0.25rem;--border-radius-md:0.5rem;--border-radius-lg:0.75rem;--border-radius-xl:1rem;--border-radius-2xl:1.5rem;--shadow-sm:0 1px 2px 0 #0000004d;--shadow-md:0 4px 6px -1px #0006,0 2px 4px -2px #0000004d;--shadow-lg:0 10px 15px -3px #00000080,0 4px 6px -4px #0006;--shadow-xl:0 20px 25px -5px #0009,0 10px 10px -5px #00000080;--transition-fast:150ms ease-in-out;--transition-normal:250ms ease-in-out;--transition-slow:350ms ease-in-out;--gradient-primary:linear-gradient(135deg,#ff6b35,#e63946);--gradient-secondary:linear-gradient(135deg,#1a1a1a,#2d1b1b 50%,#000);--gradient-quiz:linear-gradient(135deg,#ff6b35,#e63946)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:#1a1a1a;background-color:var(--background-color);background:linear-gradient(135deg,#1a1a1a,#2d1b1b 50%,#000);background:var(--gradient-secondary);color:#fff;color:var(--text-primary);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-family:var(--font-family);font-size:1rem;font-size:var(--font-size-base);line-height:1.6;min-height:100vh;overflow-x:hidden}@media screen and (orientation:portrait){.landscape-warning{align-items:center;background:linear-gradient(135deg,#1a1a1a,#2d1b1b 50%,#000);background:var(--gradient-secondary);color:#fff;display:flex;flex-direction:column;height:100vh;justify-content:center;left:0;padding:2rem;padding:var(--spacing-xl);position:fixed;text-align:center;top:0;width:100vw;z-index:9999}.landscape-warning h2{color:#ff6b35;color:var(--primary-color);font-size:1.5rem;font-size:var(--font-size-2xl);margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}.landscape-warning p{color:#ccc;color:var(--text-secondary);font-size:1.125rem;font-size:var(--font-size-lg);max-width:400px}.landscape-warning .rotate-icon{animation:rotate 2s ease-in-out infinite;color:#ff6b35;color:var(--primary-color);font-size:2.25rem;font-size:var(--font-size-4xl);margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}@keyframes rotate{0%,to{transform:rotate(0deg)}50%{transform:rotate(90deg)}}}.container{margin:0 auto;max-width:1200px;padding:0 1rem;padding:0 var(--spacing-md)}.btn{align-items:center;background:linear-gradient(135deg,#ff6b35,#e63946);background:var(--gradient-primary);border:none;border-radius:.75rem;border-radius:var(--border-radius-lg);box-shadow:0 4px 6px -1px #0006,0 2px 4px -2px #0000004d;box-shadow:var(--shadow-md);display:inline-flex;font-size:1rem;font-size:var(--font-size-base);font-weight:600;justify-content:center;padding:.5rem 1.5rem;padding:var(--spacing-sm) var(--spacing-lg);text-decoration:none;transition:all .15s ease-in-out;transition:all var(--transition-fast)}.btn:hover:not(:disabled){box-shadow:0 10px 15px -3px #00000080,0 4px 6px -4px #0006;box-shadow:var(--shadow-lg);transform:translateY(-2px)}.btn:disabled{transform:none}.btn-secondary{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff1a;border:1px solid #fff3;color:#fff;color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background:#fff3}.btn-success{background:linear-gradient(135deg,#ff6b35,#e63946);background:var(--gradient-primary);background:linear-gradient(135deg,#10b981,#059669);background:linear-gradient(135deg,var(--quiz-correct) 0,#059669 100%)}.btn-error{background:linear-gradient(135deg,#ff6b35,#e63946);background:var(--gradient-primary);background:linear-gradient(135deg,#ef4444,#dc2626);background:linear-gradient(135deg,var(--error-color) 0,#dc2626 100%)}.text-center{text-align:center}.mb-1{margin-bottom:.25rem;margin-bottom:var(--spacing-xs)}.mb-2{margin-bottom:.5rem;margin-bottom:var(--spacing-sm)}.mb-3{margin-bottom:1rem;margin-bottom:var(--spacing-md)}.mb-4{margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}.mb-5{margin-bottom:2rem;margin-bottom:var(--spacing-xl)}.mt-1{margin-top:.25rem;margin-top:var(--spacing-xs)}.mt-2{margin-top:.5rem;margin-top:var(--spacing-sm)}.mt-3{margin-top:1rem;margin-top:var(--spacing-md)}.mt-4{margin-top:1.5rem;margin-top:var(--spacing-lg)}.mt-5{margin-top:2rem;margin-top:var(--spacing-xl)}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#1a1a1a;background:var(--background-color)}::-webkit-scrollbar-thumb{background:#ff6b35;background:var(--primary-color);border-radius:.25rem;border-radius:var(--border-radius-sm)}::-webkit-scrollbar-thumb:hover{background:#e63946;background:var(--secondary-color)}.top-bar{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#1a1a1af2;border-bottom:1px solid #ffffff1a;display:flex;height:80px;left:0;overflow:visible;position:fixed;right:0;top:0;transition:height .3s ease,opacity .3s ease;z-index:1000}.top-bar,.top-bar.hidden{padding:0 var(--spacing-lg)}.top-bar.hidden{border-bottom:none;height:0;opacity:0}.top-bar-content{align-items:center;display:flex;justify-content:space-between;margin:0 auto;max-width:1200px;width:100%}.logo-section{align-items:flex-start;display:flex;flex-direction:column}.logo-image{cursor:pointer;filter:brightness(1.1) contrast(1.1);height:55px;max-width:250px;object-fit:contain;transition:filter .3s ease;width:auto}.logo-image:hover{filter:brightness(1.2) contrast(1.2)}.logo-text-fallback .logo{color:var(--text-primary);font-size:var(--font-size-2xl);font-weight:700;letter-spacing:2px;margin-bottom:var(--spacing-xs)}.logo-text-fallback .logo-subtitle{color:var(--text-secondary);font-size:var(--font-size-sm);font-weight:500}.logo-text-fallback .logo-subtitle.ar{direction:rtl;font-size:var(--font-size-xs)}.logo{color:var(--text-primary);font-size:var(--font-size-2xl);font-weight:700;letter-spacing:2px;margin-bottom:var(--spacing-xs)}.logo-subtitle{color:var(--text-secondary);font-size:var(--font-size-sm);font-weight:500}.logo-subtitle.ar{direction:rtl;font-size:var(--font-size-xs)}.slide-navigation{align-items:center;display:flex;left:50%;position:absolute;transform:translateX(-50%)}.slide-nav-btn{align-items:center;background:#0000;border:none;border-radius:6px;color:var(--text-secondary);cursor:pointer;display:flex;font-size:var(--font-size-sm);font-weight:600;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);transition:all var(--transition-fast)}.slide-nav-btn:hover{background:#ffffff1a;color:var(--text-primary)}.slide-current{font-family:Courier New,monospace;letter-spacing:1px}.dropdown-arrow{transition:transform var(--transition-fast)}.dropdown-arrow.open{transform:rotate(180deg)}.slide-dropdown{animation:fadeInScale .2s ease-out;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#1a1a1af2;border:1px solid #ffffff1a;border-radius:8px;box-shadow:var(--shadow-lg);left:50%;max-width:400px;min-width:300px;overflow:hidden;position:absolute;top:calc(100% + 8px);transform:translateX(-50%);z-index:1002}.slide-dropdown,.slide-dropdown-list{max-height:calc(100vh - var(--top-bar-height) - var(--audio-bar-height) - 100px)}.slide-dropdown-list{overflow-y:auto;padding:var(--spacing-xs)}.slide-option{background:#0000;border:none;border-radius:6px;color:var(--text-primary);cursor:pointer;margin-bottom:var(--spacing-xs);padding:0;text-align:left;transition:all var(--transition-fast);width:100%}.slide-option:last-child{margin-bottom:0}.slide-option:hover:not(.disabled){background:#26d0ce1a}.slide-option.current{background:var(--primary-color);color:#fff}.slide-option.current:hover{background:var(--secondary-color)}.slide-option.completed:not(.current){background:#4caf501a}.slide-option.completed:not(.current):hover{background:#4caf5033}.slide-option.disabled{cursor:not-allowed;opacity:.5}.slide-option-content{align-items:center;display:flex;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md)}.slide-number{font-family:Courier New,monospace;font-weight:700;min-width:24px}.slide-number,.slide-title{color:inherit;font-size:var(--font-size-sm)}.slide-title{flex:1 1;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.slide-status{align-items:center;display:flex;gap:var(--spacing-xs)}.status-indicator{border-radius:4px;font-size:var(--font-size-xs);font-weight:600;letter-spacing:.5px;padding:2px 6px;text-transform:uppercase}.current-indicator{background:#fff3;color:#fff}.slide-dropdown-list::-webkit-scrollbar{width:6px}.slide-dropdown-list::-webkit-scrollbar-track{background:#ffffff1a;border-radius:3px}.slide-dropdown-list::-webkit-scrollbar-thumb{background:#26d0ce80;border-radius:3px}.slide-dropdown-list::-webkit-scrollbar-thumb:hover{background:#26d0ceb3}.controls-section{align-items:center;display:flex;gap:var(--spacing-md)}.language-controls{align-items:center;display:flex;position:relative}.language-selector{background:var(--primary-color);border:2px solid var(--primary-color);border-radius:6px;box-shadow:var(--shadow-sm);color:#fff;cursor:pointer;font-size:var(--font-size-sm);font-weight:500;margin-right:var(--spacing-md);min-width:100px;padding:var(--spacing-xs) var(--spacing-sm);transition:all var(--transition-fast)}.language-selector:hover{background:var(--secondary-color);border-color:var(--secondary-color);transform:scale(1.02)}.language-selector:focus{box-shadow:0 0 0 3px #26d0ce4d;outline:none}.language-selector option{background:var(--background-dark);color:var(--text-primary);padding:var(--spacing-xs)}.language-icon-btn{align-items:center;background:var(--primary-color);border:2px solid var(--primary-color);border-radius:50%;box-shadow:var(--shadow-sm);color:#fff;cursor:pointer;display:flex;height:40px;justify-content:center;margin-right:var(--spacing-md);padding:var(--spacing-xs);transition:all var(--transition-fast);width:40px}.language-icon-btn:hover{background:var(--secondary-color);border-color:var(--secondary-color);transform:scale(1.05)}.language-icon-btn:focus{box-shadow:0 0 0 3px #26d0ce4d;outline:none}.language-dropdown{animation:fadeInScale .2s ease-out;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#1a1a1af2;border:1px solid #ffffff1a;border-radius:8px;box-shadow:var(--shadow-lg);max-width:200px;min-width:160px;padding:var(--spacing-xs);position:absolute;right:0;top:calc(100% + 8px);transform:translateX(0);z-index:1002}@keyframes fadeInScale{0%{opacity:0;transform:translateY(-8px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.language-option{align-items:center;background:#0000;border:none;border-radius:6px;color:var(--text-primary);cursor:pointer;display:flex;font-size:var(--font-size-sm);font-weight:500;padding:var(--spacing-sm) var(--spacing-md);text-align:left;transition:all var(--transition-fast);width:100%}.language-option:hover{background:#26d0ce1a;color:var(--secondary-color)}.language-option.active{background:var(--primary-color);color:#fff}.language-option.active:hover{background:var(--secondary-color)}.language-name{white-space:nowrap}.lang-icon-btn{align-items:center;background:var(--primary-color);border:2px solid var(--primary-color);border-radius:50%;box-shadow:var(--shadow-sm);color:#fff;cursor:pointer;display:flex;height:40px;justify-content:center;padding:var(--spacing-xs);transition:all var(--transition-fast);width:40px}.lang-icon-btn:hover{background:var(--secondary-color);border-color:var(--secondary-color);transform:scale(1.05)}.lang-btn{align-items:center;background:var(--primary-color);border:2px solid var(--primary-color);border-radius:50%;box-shadow:var(--shadow-sm);color:#fff;cursor:pointer;display:flex;font-size:var(--font-size-sm);font-weight:700;height:40px;justify-content:center;padding:var(--spacing-xs) var(--spacing-md);transition:all var(--transition-fast);width:40px}.lang-btn:hover{transform:scale(1.05)}.lang-btn.active,.lang-btn:hover{background:var(--secondary-color);border-color:var(--secondary-color)}.lang-btn.active{box-shadow:var(--shadow-md)}.speaker-btn{align-items:center;background:var(--primary-color);border:2px solid var(--primary-color);border-radius:50%;box-shadow:var(--shadow-sm);color:#fff;cursor:pointer;display:flex;height:40px;justify-content:center;transition:all var(--transition-fast);width:40px}.speaker-btn:hover{background:var(--secondary-color);border-color:var(--secondary-color);transform:scale(1.05)}.speaker-btn.muted{background:var(--error-color);border-color:var(--error-color)}.speaker-btn.muted:hover{background:#dc2626;border-color:#dc2626}.speaker-icon{height:20px;width:20px}@media (max-width:768px){.top-bar{height:70px;padding:0 var(--spacing-md)}.logo{font-size:var(--font-size-xl)}.logo-subtitle,.slide-nav-btn{font-size:var(--font-size-xs)}.slide-dropdown{max-width:350px;min-width:280px}.slide-dropdown,.slide-dropdown-list{max-height:calc(100vh - 205px)}.language-icon-btn,.speaker-btn{height:36px;width:36px}.speaker-icon{height:18px;width:18px}.language-dropdown{min-width:140px;right:-10px}}@media (max-width:480px){.top-bar{height:60px;padding:0 var(--spacing-sm)}.top-bar-content{gap:var(--spacing-sm)}.language-selector{gap:var(--spacing-xs)}.language-icon-btn,.speaker-btn{height:32px;width:32px}.speaker-icon{height:16px;width:16px}.slide-dropdown{max-width:320px;min-width:260px}.slide-dropdown,.slide-dropdown-list{max-height:calc(100vh - 170px)}.slide-option-content{padding:var(--spacing-xs) var(--spacing-sm)}.slide-title{font-size:var(--font-size-xs)}}@media (max-width:380px){.top-bar{height:60px;padding:0 var(--spacing-sm)}.language-icon-btn,.speaker-btn{height:30px;width:30px}.speaker-icon{height:14px;width:14px}}.audio-bar{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:linear-gradient(135deg,#ff6b35f2,#e63946f2);border-top:1px solid #fff3;bottom:0;box-shadow:0 -4px 20px #0000004d;display:flex;height:70px;left:0;opacity:1;overflow:hidden;padding:0 var(--spacing-md);position:fixed;right:0;transition:height .3s ease,opacity .3s ease;z-index:1000}.audio-bar.hidden{border-top:none;box-shadow:none;height:0;opacity:0;padding:0 var(--spacing-md)}.audio-bar-content{grid-gap:var(--spacing-lg);align-items:center;display:grid;gap:var(--spacing-lg);grid-template-columns:auto 1fr auto;height:100%;margin:0 auto;max-width:1400px;padding:0 var(--spacing-md);position:relative;width:100%}.content-info{display:flex;flex-direction:column;gap:var(--spacing-xs);justify-self:start}.session-title{color:var(--text-primary);font-size:var(--font-size-lg);font-weight:600}.content-title{color:#fff;font-size:var(--font-size-base);font-weight:600;text-shadow:0 1px 2px #00000080}.audio-controls{align-items:center;display:flex;flex-shrink:0;gap:var(--spacing-md);justify-content:flex-start;justify-self:start;min-width:200px}.forward-btn,.rewind-btn{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fff3;border:2px solid #ffffff4d;border-radius:50%;box-shadow:0 4px 12px #0003;color:#fff;cursor:pointer;display:flex;height:40px;justify-content:center;transition:all .3s ease;width:40px}.forward-btn:hover:not(:disabled),.rewind-btn:hover:not(:disabled){background:#ffffff4d;border-color:#ffffff80;transform:scale(1.05)}.forward-btn:disabled,.rewind-btn:disabled{background:#ffffff1a;cursor:not-allowed;opacity:.3;transform:none}.play-btn{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffffe6;border:3px solid #fff;border-radius:50%;box-shadow:0 6px 20px #0000004d;color:#ff6b35;cursor:pointer;display:flex;height:48px;justify-content:center;margin:0 var(--spacing-sm);transition:all .3s ease;width:48px}.play-btn:hover:not(:disabled){background:#fff;box-shadow:0 8px 25px #0006;transform:scale(1.08)}.play-btn:disabled{cursor:not-allowed;opacity:.5;transform:none}.play-btn.playing{background:var(--secondary-color)}.timeline{align-items:center;display:flex;flex:1 1;flex-direction:row;gap:var(--spacing-md);margin:0 var(--spacing-xs) 0 0;max-width:none;min-width:200px;overflow:hidden;transition:all var(--transition-fast);width:100%}.timeline,.timeline.seekable{cursor:pointer}.timeline.no-seek{cursor:not-allowed;opacity:.7}.progress-bar-container{cursor:pointer;flex:1 1}.progress-bar{background:#fff6;border-radius:4px;box-shadow:inset 0 1px 3px #0000004d;height:8px;overflow:hidden;position:relative;transition:all .3s ease}.timeline.seekable .progress-bar{background:#ffffff4d}.timeline.no-seek .progress-bar{background:#ffffff1a}.progress-fill{background:linear-gradient(90deg,#fff,#fffffff2);border-radius:4px;box-shadow:0 1px 2px #0000004d;height:100%;transition:width .3s ease}.progress-handle{background:#fff;border:2px solid #fff;border-radius:50%;box-shadow:0 2px 8px #0000004d;height:16px;opacity:0;position:absolute;top:50%;transform:translate(-50%,-50%);transition:opacity .3s ease;width:16px}.timeline.seekable:hover .progress-handle{opacity:1}.timeline.no-seek .progress-handle{display:none}.time-display{color:#ffffffe6;flex-shrink:0;font-size:var(--font-size-sm);font-weight:600;min-width:80px;text-align:right;text-shadow:0 1px 2px #00000080;white-space:nowrap}.navigation-controls{display:flex;flex-shrink:0;gap:var(--spacing-sm);justify-content:flex-end;justify-self:end;min-width:200px}.nav-btn{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fff3;border:2px solid #fff6;border-radius:25px;color:#fff;cursor:pointer;font-size:var(--font-size-sm);font-weight:700;min-height:44px;min-width:80px;padding:10px 20px;text-shadow:0 1px 2px #00000080;transition:all .3s ease}.nav-btn:hover:not(:disabled){background:#ffffff4d;border-color:#fff9;box-shadow:0 4px 12px #0000004d;transform:translateY(-2px)}.nav-btn:disabled{background:#ffffff0d;border-color:#ffffff1a;color:var(--text-secondary);cursor:not-allowed;opacity:.5;transform:none}.nav-btn.exit{background:linear-gradient(135deg,#ff6b35,#e63946);border-color:#fff9;box-shadow:0 4px 12px #e6394666;color:#fff}.nav-btn.exit:hover:not(:disabled){background:linear-gradient(135deg,var(--secondary-color) 0,#dc2626 100%);border-color:var(--secondary-color)}@media (max-width:1024px){.timeline{max-width:400px;min-width:220px}.time-display{font-size:.85rem;min-width:75px}.navigation-controls{min-width:180px}}@media (max-width:900px){.audio-bar-content{gap:var(--spacing-xs);grid-template-columns:auto 1fr minmax(160px,auto)}.timeline{gap:var(--spacing-xs);min-width:180px}.time-display{font-size:.8rem;min-width:65px}.navigation-controls{gap:var(--spacing-xs);min-width:160px}.nav-btn{font-size:.85rem;min-width:45px;padding:var(--spacing-xs) var(--spacing-sm)}}@media (max-width:768px){.audio-bar{height:55px;padding:0 var(--spacing-sm)}.audio-bar-content{gap:var(--spacing-sm);grid-template-columns:auto 1fr minmax(180px,auto);padding:0 var(--spacing-sm)}.content-info{display:none}.session-title{font-size:var(--font-size-base)}.content-title{font-size:var(--font-size-xs)}.audio-controls{gap:var(--spacing-sm)}.forward-btn,.rewind-btn{height:32px;width:32px}.play-btn{height:40px;margin:0 var(--spacing-xs);width:40px}.progress-bar{height:6px}.progress-handle{height:16px;width:16px}.timeline{gap:var(--spacing-xs);margin:0 var(--spacing-xs);max-width:none;min-width:160px}.time-display{font-size:.75rem;min-width:65px}.navigation-controls{gap:var(--spacing-xs)}.nav-btn{font-size:.8rem;min-height:38px;min-width:50px;padding:var(--spacing-xs) 8px}}@media (max-width:480px){.audio-bar{height:60px;padding:0 var(--spacing-xs)}.audio-bar-content{gap:4px;grid-template-columns:auto 1fr auto;padding:0 var(--spacing-xs)}.content-info{display:none}.session-title{font-size:var(--font-size-sm)}.content-title{font-size:var(--font-size-xs)}.audio-controls{flex-shrink:0;gap:var(--spacing-xs)}.forward-btn,.rewind-btn{height:28px;width:28px}.play-btn{height:32px;margin:0 2px;width:32px}.progress-bar{height:5px}.progress-handle{height:12px;width:12px}.timeline{flex-shrink:1;gap:1px;margin:0 1px 0 0;max-width:120px;min-width:60px}.time-display{font-size:.55rem;min-width:35px}.navigation-controls{flex-shrink:0;gap:1px;min-width:140px}.nav-btn{font-size:.55rem;min-height:28px;min-width:30px;overflow:hidden;padding:2px 4px;text-overflow:ellipsis;white-space:nowrap}}@media (max-width:380px){.audio-bar{height:65px}.audio-bar-content{gap:2px;grid-template-columns:auto 1fr auto}.audio-controls{flex-shrink:0;gap:2px}.forward-btn,.rewind-btn{height:24px;width:24px}.play-btn{height:28px;margin:0 1px;width:28px}.timeline{flex-shrink:1;gap:1px;margin:0 1px 0 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