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infinite}.video-container{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;background:#000;border-radius:10px;margin:20px 0}.video-container iframe{position:absolute;top:0;left:0;width:100%;height:100%}.video-thumbnail-container{position:relative;cursor:pointer;border-radius:10px;overflow:hidden;margin:20px 0}.video-thumbnail-img{width:100%;display:block;transition:transform .3s ease}.video-thumbnail-container:hover .video-thumbnail-img{transform:scale(1.05)}.video-play-button{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);transition:transform .3s ease,opacity .3s ease;opacity:.8}.video-thumbnail-container:hover .video-play-button{transform:translate(-50%,-50%) scale(1.1);opacity:1}.phet-simulation-container{position:relative;width:100%;height:500px;border-radius:10px;margin:20px 0;overflow:hidden}.phet-simulation-container iframe{width:100%;height:100%}.phet-preview{width:100%;height:100%;background-size:cover;background-position:center;position:relative}.phet-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background-color:#000000b3;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:var(--text-color);padding:20px}.rotate-icon{width:180px;height:150px;margin-bottom:20px;opacity:.7;animation:gentle-rotate 3s ease-in-out infinite}.code-snippet-container{margin:20px 0;border-radius:10px;overflow:hidden;font-size:.9em}.code-snippet-container pre{background:var(--code-bg-color)!important;border-radius:10px!important;border:1px solid var(--border-color)!important}.timeline-container{position:relative;padding-left:30px;margin-left:20px}.timeline-container:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background-color:var(--timeline-border-color);border-radius:3px}.timeline-item{position:relative;margin-bottom:25px;animation:slideInFromLeft .5s ease-out forwards;opacity:0}.timeline-dot{position:absolute;left:-41px;top:4px;width:20px;height:20px;background-color:var(--bg-color);border:3px solid var(--timeline-border-color);border-radius:50%}.timeline-content h4{margin:0 0 5px;color:var(--header-color)}.timeline-content p{margin:0}.audio-player-container{margin:20px 0}.audio-player-container audio{width:100%}.glossary-modal-backdrop{position:fixed;top:0;left:0;width:100%;height:100%;background:#000000b3;display:flex;justify-content:center;align-items:center;z-index:4000;animation:fadeIn .3s ease-in-out}.glossary-modal-backdrop.exiting{animation:fadeOut .3s ease-in-out 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10px;font-weight:700}.controls-wrapper{display:flex;align-items:center;gap:15px}.play-pause-btn,.skip-btn{background-color:transparent;border:none;cursor:pointer;flex-shrink:0;padding:0;display:flex;align-items:center;justify-content:center;width:32px;height:32px;color:var(--text-color)}.play-pause-btn img{width:100%;height:100%;object-fit:contain}.time{font-size:.9em;min-width:40px;text-align:center}.progress-bar{flex-grow:1;-webkit-appearance:none;appearance:none;height:8px;border-radius:5px;outline:none;background:linear-gradient(to right,#23f0cb var(--progress-percent, 0%),rgba(255,255,255,.3) var(--progress-percent, 0%))}.progress-bar::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:16px;height:16px;background:#23f0cb;cursor:pointer;border-radius:50%;margin-top:-4px}.progress-bar::-moz-range-thumb{width:16px;height:16px;background:#23f0cb;cursor:pointer;border-radius:50%}.playback-speed{display:flex;gap:5px}.playback-speed button{background:transparent;border:1px solid var(--border-color);color:var(--text-color);border-radius:5px;padding:5px 8px;cursor:pointer}.playback-speed button.active{background-color:var(--accent-color);color:var(--bg-color);border-color:var(--accent-color)}.volume-control{display:flex;align-items:center;gap:5px}@media (max-width: 480px){.controls-wrapper{gap:10px}.volume-control,.playback-speed{display:none}}.image-slider-container{margin:20px 0}.slider-wrapper{position:relative;height:300px;overflow:hidden;border-radius:10px}.slide{position:absolute;width:100%;height:100%;opacity:0;transition:opacity .5s ease-in-out}.slide.active{opacity:1}.slide-image{width:100%;height:100%;object-fit:cover}.slide-caption{position:absolute;bottom:0;left:0;right:0;background:#00000080;color:#fff;padding:10px;text-align:center}.slider-control{position:absolute;top:50%;transform:translateY(-50%);background:#00000080;color:#fff;border:none;padding:10px;cursor:pointer;border-radius:50%}.slider-control.prev{left:10px}.slider-control.next{right:10px}.slider-control.fullscreen-btn{top:10px;right:10px;transform:none}.thumbnails-wrapper{display:flex;justify-content:center;margin-top:10px}.thumbnail{width:60px;height:40px;object-fit:cover;margin:0 5px;cursor:pointer;border-radius:5px;border:2px solid transparent;transition:border-color .3s}.thumbnail.active{border-color:var(--accent-color)}.fullscreen-modal{position:fixed;top:0;left:0;width:100%;height:100%;background:#000000e6;z-index:2000;display:flex;align-items:center;justify-content:center}.close-fullscreen{position:absolute;top:20px;right:20px;background:transparent;border:none;color:#fff;font-size:2rem;cursor:pointer}.zoom-controls{position:absolute;bottom:20px;left:50%;transform:translate(-50%);background:#00000080;border-radius:10px;padding:5px;display:flex;gap:10px}.zoom-controls button{background:transparent;border:none;color:#fff;font-size:1.5rem;cursor:pointer}.fullscreen-image-wrapper{width:100%;height:100%;overflow:hidden;cursor:grab}.fullscreen-image-wrapper img{width:100%;height:100%;object-fit:contain;transition:transform .3s}:root{--react-pdf-annotation-layer: 1;--annotation-unfocused-field-background: url("data:image/svg+xml;charset=UTF-8,<svg width='1px' height='1px' xmlns='http://www.w3.org/2000/svg'><rect width='100%' height='100%' style='fill:rgba(0, 54, 255, 0.13);'/></svg>");--input-focus-border-color: Highlight;--input-focus-outline: 1px solid Canvas;--input-unfocused-border-color: transparent;--input-disabled-border-color: transparent;--input-hover-border-color: black;--link-outline: none}@media screen and (forced-colors: active){:root{--input-focus-border-color: CanvasText;--input-unfocused-border-color: ActiveText;--input-disabled-border-color: GrayText;--input-hover-border-color: Highlight;--link-outline: 1.5px solid LinkText}.annotationLayer .textWidgetAnnotation :is(input,textarea):required,.annotationLayer .choiceWidgetAnnotation select:required,.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) input:required{outline:1.5px solid selectedItem}.annotationLayer .linkAnnotation:hover{-webkit-backdrop-filter:invert(100%);backdrop-filter:invert(100%)}}.annotationLayer{position:absolute;top:0;left:0;pointer-events:none;transform-origin:0 0;z-index:3}.annotationLayer[data-main-rotation="90"] 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.buttonWidgetAnnotation.checkBox :focus{border:2px solid var(--input-focus-border-color);border-radius:2px;outline:var(--input-focus-outline)}.annotationLayer .buttonWidgetAnnotation.radioButton :focus{border:2px solid var(--input-focus-border-color);outline:var(--input-focus-outline)}.annotationLayer .buttonWidgetAnnotation.checkBox input:checked:before,.annotationLayer .buttonWidgetAnnotation.checkBox input:checked:after,.annotationLayer .buttonWidgetAnnotation.radioButton input:checked:before{background-color:CanvasText;content:"";display:block;position:absolute}.annotationLayer .buttonWidgetAnnotation.checkBox input:checked:before,.annotationLayer .buttonWidgetAnnotation.checkBox input:checked:after{height:80%;left:45%;width:1px}.annotationLayer .buttonWidgetAnnotation.checkBox input:checked:before{transform:rotate(45deg)}.annotationLayer .buttonWidgetAnnotation.checkBox input:checked:after{transform:rotate(-45deg)}.annotationLayer .buttonWidgetAnnotation.radioButton 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a{background:transparent;border:none;color:var(--text-color);cursor:pointer}.pdf-document-wrapper{max-height:500px;overflow:auto}.pdf-reader-container.dark-mode .react-pdf__Page__canvas{filter:invert(1) hue-rotate(180deg)}.map-renderer-container{position:relative;width:100%;height:400px;margin:20px 0;border-radius:10px;overflow:hidden}.map-renderer-container.fullscreen{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:2000;border-radius:0}.map-controls{position:absolute;top:10px;right:10px;z-index:1}.map-controls button{background:#00000080;border:none;color:#fff;padding:10px;border-radius:50%;cursor:pointer}.model-renderer-container{width:100%;height:400px;margin:20px 0;border-radius:10px;overflow:hidden}@media (max-width: 768px){.model-renderer-container{height:300px}}.lesson-practice{display:flex;flex-direction:column;gap:20px}.practice-question-card{padding:20px}.question-header{display:flex;justify-content:space-between;align-items:flex-start;gap:15px}.question-text{font-size:1.1em;margin-bottom:15px;color:var(--text-color);line-height:1.5;flex-grow:1}.bookmark-btn{background:none;border:none;color:var(--text-color);cursor:pointer;font-size:1.2em}.bookmark-btn.bookmarked{color:var(--accent-color)}.question-image{width:100%;border-radius:8px;margin-bottom:15px}.options-container{display:flex;flex-direction:column;gap:10px}.option-button{width:100%;padding:12px;background:var(--component-bg-color);border:1px solid var(--border-color);color:var(--text-color);border-radius:8px;cursor:pointer;transition:all .2s ease-in-out;text-align:left}.option-button.correct{background-color:#00c853cc;color:#fff;border-color:#00c853}.option-button.incorrect{background-color:#ff5252cc;color:#fff;border-color:#ff5252}.fill-in-the-blank-input{width:100%;padding:12px;background:var(--component-bg-color);border:1px solid var(--border-color);color:var(--text-color);border-radius:8px;font-size:1em}.fill-in-the-blank-input.correct{border-color:#00c853}.fill-in-the-blank-input.incorrect{border-color:#ff5252}.question-footer{margin-top:20px}.footer-buttons{display:flex;justify-content:space-between;gap:10px}.show-answer-btn,.submit-button{padding:10px 15px;border:1px solid var(--accent-color);border-radius:8px;font-weight:700;cursor:pointer;display:flex;align-items:center;gap:8px}.show-answer-btn{background:transparent;color:var(--accent-color)}.submit-button{background-color:var(--accent-color);color:var(--bg-color)}.submit-button:disabled{background-color:#555;border-color:#555;cursor:not-allowed}.feedback-container{margin-top:15px;animation:fadeInUp .4s ease-out}.walkthrough-wrapper{overflow:hidden;transition:max-height .4s ease-in-out,opacity .4s ease-in-out;max-height:0;opacity:0}.walkthrough-wrapper.open{max-height:1000px;opacity:1;margin-top:15px}.feedback-message{font-weight:700;display:flex;align-items:center;gap:8px}.feedback-message.correct{color:#00c853}.feedback-message.incorrect{color:#ff5252}.explanation-box{margin-top:10px;padding:15px;background:#0003;border-left:4px solid var(--accent-color);border-radius:0 8px 8px 0}.explanation-box img{width:100%;border-radius:8px;margin-top:10px}.matching-container{display:flex;justify-content:space-between;gap:20px;align-items:center}.matching-prompts,.matching-options{display:flex;flex-direction:column;gap:10px;flex:1}.matching-prompt,.matching-option{padding:12px;border-radius:8px;background:var(--component-bg-color);border:1px solid var(--border-color);min-height:40px;display:flex;align-items:center;justify-content:space-between}.matching-option{cursor:grab}.matching-option:active{cursor:grabbing}.matching-prompt.correct{border-color:#00c853}.matching-prompt.incorrect{border-color:#ff5252}.diagram-labeling-container{display:flex;flex-direction:column;gap:20px}.diagram-image-wrapper{position:relative;width:100%;max-width:500px;margin:0 auto}.diagram-image-wrapper img{width:100%;border-radius:8px}.diagram-hotspot{width:30px;height:30px;border-radius:50%;background-color:#23f0cbb3;border:2px solid white;display:flex;align-items:center;justify-content:center;transition:background-color .3s,border-color .3s}.hotspot-placeholder{color:#fff;font-weight:700}.placed-label{font-size:.8em;font-weight:700;color:var(--bg-color)}.diagram-labels-pool{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;padding:10px;border:1px dashed var(--border-color);border-radius:8px;min-height:50px}.diagram-label{padding:8px 12px;border-radius:8px;background:var(--component-bg-color);cursor:grab}.diagram-label:active{cursor:grabbing}.diagram-hotspot.correct{background-color:#00c853b3;border-color:#00c853}.diagram-hotspot.incorrect{background-color:#ff5252b3;border-color:#ff5252}.walkthrough-btn{background-color:transparent;color:#f0cb23;border:1px solid #f0cb23;padding:10px 15px;border-radius:8px;font-weight:700;cursor:pointer;display:flex;align-items:center;gap:8px}.worked-example-container{margin-top:20px;border:1px solid var(--border-color);border-radius:8px;padding:15px}.walkthrough-step{min-height:100px;position:relative;overflow:hidden}.step-content{position:absolute;width:100%;animation-duration:.3s;animation-fill-mode:forwards}.step-content.enter-next{animation-name:slideInFromRight}.step-content.enter-prev{animation-name:slideInFromLeft}.step-content.exit-next{animation-name:slideOutToLeft}.step-content.exit-prev{animation-name:slideOutToRight}.step-description{line-height:1.6}.step-image{width:100%;border-radius:8px;margin-top:10px}.walkthrough-navigation{display:flex;justify-content:space-between;align-items:center;margin-top:15px;border-top:1px solid var(--border-color);padding-top:10px}.walkthrough-navigation button{background:transparent;color:var(--accent-color);border:1px solid var(--accent-color);border-radius:8px;padding:8px 12px;cursor:pointer;display:flex;align-items:center;gap:5px}.walkthrough-navigation button:disabled{opacity:.5;cursor:not-allowed}@keyframes slideInFromRight{0%{opacity:0;transform:translate(50px)}to{opacity:1;transform:translate(0)}}@keyframes slideInFromLeft{0%{opacity:0;transform:translate(-50px)}to{opacity:1;transform:translate(0)}}@keyframes slideOutToLeft{0%{opacity:1;transform:translate(0)}to{opacity:0;transform:translate(-50px)}}@keyframes slideOutToRight{0%{opacity:1;transform:translate(0)}to{opacity:0;transform:translate(50px)}}/**
* Copyright (c) 2014 The xterm.js authors. All rights reserved.
* Copyright (c) 2012-2013, Christopher Jeffrey (MIT License)
* https://github.com/chjj/term.js
* @license MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* Originally forked from (with the author's permission):
*   Fabrice Bellard's javascript vt100 for jslinux:
*   http://bellard.org/jslinux/
*   Copyright (c) 2011 Fabrice Bellard
*   The original design remains. The terminal itself
*   has been extended to include xterm CSI codes, among
*   other features.
*/.xterm{cursor:text;position:relative;user-select:none;-ms-user-select:none;-webkit-user-select:none}.xterm.focus,.xterm:focus{outline:none}.xterm .xterm-helpers{position:absolute;top:0;z-index:5}.xterm .xterm-helper-textarea{padding:0;border:0;margin:0;position:absolute;opacity:0;left:-9999em;top:0;width:0;height:0;z-index:-5;white-space:nowrap;overflow:hidden;resize:none}.xterm .composition-view{background:#000;color:#fff;display:none;position:absolute;white-space:nowrap;z-index:1}.xterm .composition-view.active{display:block}.xterm .xterm-viewport{background-color:#000;overflow-y:scroll;cursor:default;position:absolute;inset:0}.xterm .xterm-screen{position:relative}.xterm .xterm-screen canvas{position:absolute;left:0;top:0}.xterm .xterm-scroll-area{visibility:hidden}.xterm-char-measure-element{display:inline-block;visibility:hidden;position:absolute;top:0;left:-9999em;line-height:normal}.xterm.enable-mouse-events{cursor:default}.xterm.xterm-cursor-pointer,.xterm 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