.ai-modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;backdrop-filter:blur(4px);z-index:1000;display:flex;justify-content:center;align-items:center;padding:1rem;opacity:1;transition:opacity .3s ease}.ai-modal-overlay.hidden{opacity:0;pointer-events:none}.ai-chat-container{width:100%;max-width:600px;height:85vh;max-height:700px;background:var(--bg-color);border:3px solid var(--border-color);border-radius:16px 24px 20px 28px/24px 20px 28px 16px;display:flex;flex-direction:column;transform:translateY(0) scale(1);transition:all .3s cubic-bezier(.25,.8,.25,1);overflow:hidden;font-family:aria,sans-serif}.ai-modal-overlay.hidden .ai-chat-container{transform:translateY(20px) scale(.95)}.ai-chat-header{background-color:var(--purple-primary);color:#fff;padding:1rem 1.5rem;display:flex;justify-content:space-between;align-items:center;flex-shrink:0}.ai-header-title{display:flex;align-items:center;gap:.75rem}.ai-header-title h3{margin:0;font-size:1.25rem;font-family:inherit;font-weight:700;color:#fff}.close-btn{width:40px;height:40px}.btn.transparent{color:#fff}.ai-chat-messages{flex:1;padding:1.5rem;overflow-y:auto;display:flex;flex-direction:column;gap:1rem;background:var(--bg-color);-webkit-overflow-scrolling:touch}.message{max-width:85%;padding:.85rem 1.2rem;border-radius:12px 18px 14px 20px/18px 14px 20px 12px;font-size:1.1rem;line-height:1.4;border:2px solid var(--border-color);word-break:break-word}.message ul{margin:.5rem 0 0 1.5rem;padding:0}.ai-message{background:var(--bg-card);color:var(--text-color);align-self:flex-start;border-bottom-left-radius:4px}.user-message{background:var(--purple-primary);color:#fff;border-color:var(--purple-primary);align-self:flex-end;box-shadow:2px 3px 0 var(--shadow-color);border-bottom-right-radius:4px}.typing{font-style:normal;color:var(--text-muted);display:inline-flex;align-items:center;gap:.6rem}.ai-typing-dots{display:inline-flex;align-items:center;gap:.25rem}.ai-typing-dots span{width:7px;height:7px;background-color:var(--purple-primary);border-radius:50%;animation:ai-typing-bounce 1.1s infinite ease-in-out both}.ai-typing-dots span:nth-child(1){animation-delay:0s}.ai-typing-dots span:nth-child(2){animation-delay:.15s}.ai-typing-dots span:nth-child(3){animation-delay:.3s}@keyframes ai-typing-bounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1.1);opacity:1}}.ai-config-banner{padding:.65rem 1.25rem;background:var(--bg-card);border-bottom:2px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;gap:.75rem;flex-shrink:0}.ai-config-status{display:flex;align-items:center;gap:.55rem;font-family:inherit;font-size:1.05rem;font-weight:700;color:var(--yellow-base)}.ai-status-icon{font-size:1.25em;line-height:1;color:var(--yellow-base)}.ai-status-text{color:var(--yellow-base)}.ai-config-toggle{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem 1rem;font-family:inherit;font-size:1.05rem;font-weight:700;text-decoration:none;color:var(--text-color);background-color:var(--bg-card);border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;box-shadow:3px 4px 0 var(--shadow-color);cursor:pointer;transition:all .2s cubic-bezier(.25,.8,.25,1),background-color .3s ease,border-color .3s ease,color .3s ease}.ai-config-toggle:hover{transform:translateY(2px) translate(1px);box-shadow:2px 2px 0 var(--shadow-color);background-color:var(--bg-card-hover)}.ai-config-toggle:active{transform:translateY(5px) translate(4px);box-shadow:0 0 0 transparent}.ai-config-toggle .material-symbols-rounded{font-size:1.25em}.ai-config-panel{background:var(--bg-card);border-bottom:2px solid var(--border-color);flex-shrink:0}.ai-config-panel.hidden{display:none}.ai-config-panel-inner{padding:1rem 1.25rem;display:flex;flex-direction:column;gap:.75rem}.ai-config-title{display:flex;align-items:center;gap:.5rem;margin:0;font-family:inherit;font-size:1.05rem;font-weight:700;color:var(--text-color)}.ai-config-title .material-symbols-rounded{font-size:1.25em;color:var(--color-primary)}.ai-config-input-group{display:flex;gap:.5rem}.ai-config-input-group input{flex:1;min-width:0;background-color:var(--bg-color);color:var(--text-color);border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;padding:.55rem .85rem;font-family:inherit;font-size:1.05rem;transition:border-color .2s ease,box-shadow .2s ease}.ai-config-input-group input:focus{outline:none;border-color:var(--color-primary)}.ai-save-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.55rem 1.25rem;font-family:inherit;font-size:1.05rem;font-weight:700;text-decoration:none;color:#fff;background-color:var(--color-primary);border:2px solid var(--color-primary);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;box-shadow:3px 4px 0 var(--shadow-color);cursor:pointer;white-space:nowrap;transition:all .2s cubic-bezier(.25,.8,.25,1),background-color .3s ease,border-color .3s ease,color .3s ease}.ai-save-btn:hover{transform:translateY(2px) translate(1px);box-shadow:2px 2px 0 var(--shadow-color)}.ai-save-btn:active{transform:translateY(5px) translate(4px);box-shadow:0 0 0 transparent}.ai-save-btn:disabled{opacity:.65;cursor:not-allowed}.ai-config-help{display:flex;align-items:flex-start;gap:.35rem;margin:0;font-family:inherit;font-size:.95rem;line-height:1.35;color:var(--text-muted)}.ai-config-help .material-symbols-rounded{font-size:1.1em;margin-top:.15rem;flex-shrink:0}.ai-config-help a{color:var(--color-primary);font-weight:700;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px;transition:color .2s ease}.ai-config-help a:hover{color:var(--text-color)}.ai-quick-actions{padding:.75rem 1.5rem;background:var(--bg-card);display:flex;gap:.5rem;overflow-x:auto;border-top:2px solid var(--border-color);flex-shrink:0}.btn.small{padding:.35rem .7rem;font-size:.9rem}.quick-btn{flex-shrink:0;font-size:1rem;padding:.4rem .8rem;border-radius:8px 12px 10px 14px;display:inline-flex;align-items:center;gap:.35rem}.ai-feedback-mode .ai-chat-messages{background:linear-gradient(135deg,#f59e0b0f,#f59e0b05)}.ai-feedback-active{background-color:var(--yellow-base)!important;border-color:var(--yellow-base)!important;color:#1e1e1e!important}.ai-feedback-active:hover{background-color:#b08d3a!important;border-color:#b08d3a!important}.ai-chat-input-area{padding:1rem 1.5rem;background:var(--bg-card);border-top:2px solid var(--border-color);display:flex;gap:.75rem;align-items:flex-end;flex-shrink:0}.ai-chat-input-area textarea{flex:1;background-color:var(--bg-color);color:var(--text-color);border:2px solid var(--border-color);border-radius:12px 16px 14px 18px;padding:.75rem;font-family:inherit;font-size:1.1rem;resize:none;max-height:90px;outline:none;transition:border-color .2s,box-shadow .2s;box-shadow:inset 2px 2px 4px #0000000d}.ai-chat-input-area textarea:focus{border-color:var(--purple-primary)}#ai-send-btn{width:48px;height:48px;padding:0;border-radius:12px 18px 14px 20px;flex-shrink:0;display:flex;align-items:center;justify-content:center}@media(max-width:640px){.ai-modal-overlay{padding:0!important;overflow:hidden!important;position:fixed!important;top:0;left:0;width:100%!important;height:100dvh!important}.ai-chat-container{width:100%!important;height:100%!important;max-height:100%!important;border:none!important;border-radius:0!important;box-shadow:none!important}.ai-chat-header{padding:.85rem 1rem!important}.ai-chat-messages{padding:1rem!important}.message{max-width:90%!important;font-size:1rem!important}.ai-quick-actions{padding:.6rem 1rem!important}.ai-chat-input-area{padding:.75rem 1rem!important}}.theory-section h2,.theory-section h3,.theory-section h4{color:var(--purple-primary);margin-top:1rem;margin-bottom:.5rem}.theory-section h2{margin-left:.2rem}.theory-section h3{margin-left:.4rem}.theory-section h4{margin-left:.6rem}.bottom-actions-bar{position:fixed;bottom:0;left:0;width:100%;background-color:var(--bg-color);z-index:1000;padding:.4rem .8rem}.bottom-bar-inner{max-width:var(--max-width);margin:0 auto;width:100%;box-sizing:border-box;display:flex;justify-content:space-between;align-items:center;border-top:2px dashed var(--border-color);gap:1rem;padding:.4rem .8rem}.tabs-nav{display:flex;position:relative;padding:4px;border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;background-color:var(--bg-card);isolation:isolate}.tab-indicator{position:absolute;top:4px;left:4px;height:calc(100% - 8px);width:calc(50% - 4px);background-color:var(--purple-primary);border-radius:10px 15px 12px 16px/15px 12px 16px 10px;transition:transform .25s cubic-bezier(.4,0,.2,1);z-index:-1}.tabs-nav[data-active-tab=exercises] .tab-indicator{transform:translate(100%)}.switch{flex:1;padding:.6rem 1.2rem;font-size:1rem;border:none;background:transparent!important;cursor:pointer;font-weight:700;color:var(--text-color);transition:color .25s ease;margin-left:.6rem;-webkit-tap-highlight-color:transparent}.switch.active{color:#fff}.action-buttons{display:flex;gap:.75rem}.tab-content{display:none!important}#theory.active{display:block!important;animation:fadeIn .4s ease}#exercises.active{display:flex!important;flex-direction:column;gap:.75rem;animation:fadeIn .4s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.container{margin-bottom:4rem;font-family:aria,sans-serif;font-size:1rem}article>*:first-child{margin-top:0}{}article p{margin-top:0;margin-bottom:1rem;line-height:1.4}article p:last-child{margin-bottom:0}article ul,article ol{margin-top:0;margin-bottom:1.25rem;padding-left:1.5rem;line-height:1.6}article li{margin-bottom:.5rem}article li::marker{color:var(--purple-primary);font-weight:700}.table-wrapper{width:100%;overflow-x:auto}table{width:100%;border-collapse:separate;border-spacing:0;margin:.8rem 0;background:var(--bg-card);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;border:2px solid var(--border-color)}table th,table td{border-bottom:2px solid var(--border-color);border-right:2px solid var(--border-color);padding:.5rem .75rem;text-align:left}table th{background-color:var(--bg-card-hover);font-weight:700;color:var(--text-color)}table tr:last-child td{border-bottom:none}table td:last-child,table th:last-child{border-right:none}.math-wrapper{width:100%;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}.math-wrapper .mjx-container{margin-top:0!important;margin-bottom:0!important;display:inline-block!important;min-width:100%}details{margin:1rem 0}details summary{background:var(--bg-card);border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;box-shadow:3px 4px 0 var(--shadow-color);padding:.8rem;color:var(--text-color);font-weight:700;position:relative;z-index:2;display:flex;justify-content:space-between;align-items:center;list-style:none;cursor:pointer}details summary::-webkit-details-marker{display:none}details summary:after{content:"";width:1.2rem;height:1.2rem;background-color:var(--text-color);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center / contain;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center / contain;transition:transform .3s ease}details[open] summary:after{transform:rotate(90deg)}details summary:hover{transform:translate(1px,2px);box-shadow:2px 2px 0 var(--shadow-color);background-color:var(--bg-card-hover)}details>*:not(summary){padding:.5rem .8rem;border-inline:2px dashed var(--border-color);position:relative;z-index:1}details>*:not(summary):first-of-type{margin-top:-2px;padding-top:.6rem}details>*:not(summary):last-of-type{padding-bottom:.6rem;border-bottom:2px dashed var(--border-color);border-radius:0 0 14px 20px/0 0 20px 12px}details p{margin-bottom:0}.video-wrapper,img{max-width:500px}.video-wrapper{position:relative;width:100%;aspect-ratio:16 / 9;margin:.6rem auto;background-size:cover;background-position:center;border-radius:14px;cursor:pointer;display:flex;align-items:center;justify-content:center}.video-wrapper iframe{width:100%;height:100%;border:none;border-radius:12px}.lite-yt-playbtn{width:68px;height:48px;background-color:#212121cc;border-radius:14px;position:relative;transition:background-color .2s}.lite-yt-playbtn:before{content:"";border-style:solid;border-width:11px 0 11px 19px;border-color:transparent transparent transparent #fff;position:absolute;top:50%;left:50%;transform:translate(-40%,-50%)}.lite-yt-playbtn:hover{background-color:red}img{display:block;width:100%;margin:.6rem auto;border-radius:14px;background-color:#fff}.quiz-container{display:flex;flex-direction:column;gap:1.5rem}.question-card{background:var(--bg-card);border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;padding:1.5rem;color:var(--text-color);transition:background-color .3s ease}.question-title{font-weight:700;margin-top:0;margin-bottom:1rem;line-height:1.4}.question-image{display:block;max-width:min(100%,550px);margin:0 auto 1rem}.question-points{color:var(--text-secondary, #6b7280);font-size:.9rem;font-weight:500;margin-left:.5rem;white-space:nowrap}.options-list{display:flex;flex-direction:column;gap:.6rem}.option-label{display:flex;align-items:center;gap:.75rem;padding:.75rem 1rem;border:2px solid var(--border-color);border-radius:10px 15px 12px 16px;cursor:pointer;transition:all .2s;background-color:var(--bg-color)}.option-label:hover{background-color:var(--bg-card-hover);transform:translate(2px)}.option-label input[type=radio]{width:1.2rem;height:1.2rem;accent-color:var(--purple-primary);margin:0;cursor:pointer}.exercise-actions{display:flex;gap:1rem;margin-top:1.5rem;flex-wrap:wrap}.feedback-box{margin-top:1.5rem;padding:1rem;border-radius:12px 18px 14px 20px/18px 14px 20px 12px;border:2px solid transparent;display:none;font-weight:700}.feedback-box.correct{display:block;background-color:var(--bg-card);color:var(--green-base);border-color:var(--green-base)}.feedback-box.unanswered{display:block;background-color:var(--bg-card);color:var(--yellow-base);border-color:var(--yellow-base)}.feedback-box.incorrect{display:block;background-color:var(--bg-card);color:var(--red-base);border-color:var(--red-base)}@media(max-width:640px){.bottom-actions-bar{flex-direction:column;align-items:stretch}.btn-text{display:none}.bottom-actions-bar .btn{padding:.6rem}}.custom-input{width:100%;padding:10px 14px;border:2px solid var(--border-color, #e2e8f0);background-color:var(--bg-color);color:var(--text-color);border-radius:8px;font-size:1rem;margin-top:8px;transition:border-color .3s;font-family:inherit}.custom-input:focus{outline:none;border-color:var(--primary-color, #0ea5e9)}.multi-part-container{display:flex;flex-direction:column;gap:1rem;margin-top:1rem}.multi-part-item p{margin:0 0 6px;font-size:.95rem;font-weight:500}.hidden{display:none!important}.help-link{display:inline-flex;align-items:center;gap:.25rem;margin-left:.5rem;padding:.15rem .5rem;font-family:inherit;font-size:.85em;font-weight:700;color:var(--text-muted);background-color:transparent;border:2px solid transparent;border-radius:8px 12px 10px 14px/12px 10px 14px 8px;cursor:pointer;transition:border-color .2s ease,color .2s ease}.help-link:hover{border-color:var(--border-color);color:var(--text-color)}.final-actions{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center;margin:1.5rem 0 1rem}.score-display{margin:0 0 1rem;padding:1rem;border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;background:var(--bg-card)}.score-results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}.score-result-item{padding:1rem;border-radius:12px;border:2px solid var(--border-color);text-align:center}.score-fraction{font-size:1.5rem;font-weight:700}.score-label{font-size:.9rem;color:var(--text-muted)}.score-excellent{border-color:var(--green-base);color:var(--green-base)}.score-warning{border-color:var(--yellow-base);color:var(--yellow-base)}.score-poor{border-color:var(--red-base);color:var(--red-base)}.score-answered-count{margin-top:.75rem;text-align:center;color:var(--text-muted)}.option-label.correct-answer{border-color:var(--green-base);background-color:#7fa14214}.option-label.wrong-answer{border-color:var(--red-base);background-color:#ca524514}.option-label.selected-correct{box-shadow:inset 0 0 0 2px var(--green-base)}.custom-input.correct-input{border-color:var(--green-base);background-color:#7fa14214}.custom-input.unanswered-input{box-shadow:inset 0 0 0 2px var(--yellow-base)}.custom-input.incorrect-input{border-color:var(--red-base);background-color:#ca524514}.feedback-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.5rem;margin-bottom:.5rem}.feedback-points{font-weight:700}.feedback-answer{margin:.5rem 0;font-weight:700}.feedback-text{margin-top:.5rem;display:block}.feedback-penalty{color:var(--red-base)}.modal-overlay{position:fixed;inset:0;background-color:#00000073;z-index:2000;display:flex;align-items:center;justify-content:center;padding:1rem}.modal-content{background:var(--bg-card);border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;width:100%;max-width:600px;max-height:80vh;display:flex;flex-direction:column}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;border-bottom:2px dashed var(--border-color)}.modal-header h3{margin:0}.history-content{overflow-y:auto;padding:1rem}.history-item{display:flex;gap:1rem;padding:1rem;border:2px solid var(--border-color);border-radius:10px 15px 12px 16px;margin-bottom:.75rem}.history-score{text-align:center;min-width:80px}.history-percentage{font-size:1.5rem;font-weight:700}.history-points{font-size:.9rem;color:var(--text-muted)}.history-title{font-weight:700}.history-date{color:var(--text-muted);font-size:.9rem}.history-stats{display:flex;gap:1rem;margin-top:.5rem;flex-wrap:wrap;font-size:.9rem}.no-history{text-align:center;padding:2rem;color:var(--text-muted)}.modal-footer{padding:1rem;border-top:2px dashed var(--border-color);display:flex;justify-content:flex-end}.btn.danger{color:var(--red-base);border-color:var(--red-base)}