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.close-btn{background:none;border:none;color:var(--ui-muted, #9aa6b2);font-size:1.2rem;cursor:pointer;padding:.25rem;line-height:1}.modal-header .close-btn:hover{color:var(--ui-text, #e6eef8)}.modal-body{padding:1rem}.modal-body .loading-text,.modal-body .error-text,.modal-body .empty-text{text-align:center;color:var(--ui-muted, #9aa6b2);margin:1rem 0}.modal-body .error-text{color:var(--ui-danger, #ff6b6b)}.modal-body .world-select{width:100%;padding:.75rem;border:1px solid var(--ui-border, #22303a);border-radius:8px;background:var(--ui-bg, #0b0f14);color:var(--ui-text, #e6eef8);font-size:1rem;margin-bottom:.75rem}.modal-body .checkbox-label{display:flex;align-items:center;gap:.5rem;color:var(--ui-muted, #9aa6b2);font-size:.9rem;cursor:pointer}.modal-body .checkbox-label input{width:16px;height:16px}.modal-footer{display:flex;justify-content:flex-end;gap:.75rem;padding:1rem;border-top:1px solid var(--ui-border, #22303a)}.modal-footer .cancel-btn{padding:.5rem 1rem;border:1px solid var(--ui-border, #22303a);border-radius:6px;background:transparent;color:var(--ui-text, #e6eef8);cursor:pointer}.modal-footer .cancel-btn:hover:not(:disabled){background:var(--ui-border, #22303a)}.modal-footer .import-btn{padding:.5rem 1rem;border:none;border-radius:6px;background:var(--ui-accent, #4f9cff);color:#fff;cursor:pointer;font-weight:500}.modal-footer .import-btn:hover:not(:disabled){opacity:.9}.modal-footer .import-btn:disabled,.modal-footer .cancel-btn:disabled{opacity:.5;cursor:not-allowed}.book-assembler-wizard{display:flex;flex-direction:column;height:100%;min-height:100vh;background:var(--ui-bg, #0b0f14);color:var(--ui-text, #e6eef8)}.wizard-header{display:flex;align-items:center;padding:1rem 1.5rem;background:var(--ui-surface, #0f1720);border-bottom:1px solid var(--ui-border, #22303a);gap:1rem}.wizard-header h1{margin:0;font-size:1.25rem;font-weight:600;flex:1}.credits-badge{display:flex;align-items:center;gap:.5rem;padding:.5rem .75rem;background:#4f9cff26;border:1px 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.modal-close{position:absolute;top:1rem;right:1rem;background:none;border:none;color:var(--ui-muted, #9aa6b2);font-size:1.5rem;cursor:pointer}.book-share-modal .modal-close:hover{color:var(--ui-text, #e6eef8)}.book-share-modal .modal-header h2{margin:0;font-size:1.2rem;color:var(--ui-text, #e6eef8)}.book-title-hint{margin:.5rem 0 0;color:var(--ui-muted, #9aa6b2);font-size:.9rem}.book-share-modal .modal-content{flex:1;overflow-y:auto;padding:1.5rem}.modal-error{background:#ff6b6b1a;border:1px solid var(--ui-danger, #ff6b6b);color:var(--ui-danger, #ff6b6b);padding:.75rem;border-radius:6px;margin-bottom:1rem}.class-selector{margin-bottom:1.5rem}.class-selector label{display:block;margin-bottom:.5rem;color:var(--ui-muted, #9aa6b2)}.class-selector select{width:100%;padding:.75rem;background:var(--ui-bg, #0b0f14);border:1px solid var(--ui-border, #22303a);border-radius:6px;color:var(--ui-text, #e6eef8);font-size:1rem}.class-selector select:focus{outline:none;border-color:var(--ui-accent, 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.2s}.btn-add-readers:hover:not(:disabled){opacity:.9}.btn-add-readers:disabled{background:var(--ui-border, #22303a);cursor:not-allowed;color:var(--ui-muted, #9aa6b2)}.current-readers{border-top:1px solid var(--ui-border, #22303a);padding-top:1.5rem}.current-readers h3{margin:0 0 1rem;font-size:1rem;color:var(--ui-muted, #9aa6b2)}.current-readers ul{list-style:none;padding:0;margin:0}.current-readers li{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0;border-bottom:1px solid var(--ui-border, #22303a);color:var(--ui-text, #e6eef8)}.btn-remove-reader{background:none;border:none;color:var(--ui-danger, #ff6b6b);cursor:pointer;padding:.25rem .5rem;font-size:1rem}.btn-remove-reader:hover{opacity:.8}.book-share-modal .modal-footer{padding:1rem 1.5rem;border-top:1px solid var(--ui-border, #22303a)}.modal-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem}.modal-loading p{color:var(--ui-muted, #9aa6b2)}.book-share-modal .spinner{width:40px;height:40px;border:3px solid var(--ui-border, #22303a);border-top-color:var(--ui-accent, #4f9cff);border-radius:50%;animation:share-spin 1s linear infinite;margin:0 auto 1rem}@keyframes share-spin{to{transform:rotate(360deg)}}@media(max-width:768px){.book-share-modal{max-height:90vh}.book-share-modal .modal-content{padding:1rem}.student-list th,.student-list td{padding:.5rem}}.voca-catch-particles{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:10001;overflow:hidden}.voca-catch-flash{position:fixed;width:24px;height:24px;border-radius:50%;background:radial-gradient(circle,rgba(0,229,255,.9) 0%,transparent 70%);transform:translate(-50%,-50%) scale(0);animation:voca-flash-burst .4s ease-out forwards}@keyframes voca-flash-burst{0%{transform:translate(-50%,-50%) scale(0);opacity:1}50%{transform:translate(-50%,-50%) scale(2.5);opacity:.8}to{transform:translate(-50%,-50%) scale(3.5);opacity:0}}.voca-catch-particle{position:fixed;border-radius:50%;transform:translate(-50%,-50%) scale(1);animation:voca-particle-fly .5s ease-out forwards;will-change:transform,opacity}@keyframes voca-particle-fly{0%{transform:translate(-50%,-50%) scale(1);opacity:1}30%{transform:translate(calc(-50% + var(--particle-tx, 0px) * .4),calc(-50% + var(--particle-ty, 0px) * .4)) scale(1.3);opacity:1}to{transform:translate(calc(-50% + var(--particle-tx, 0px)),calc(-50% + var(--particle-ty, 0px))) scale(0);opacity:0}}.voca-catch-glow{position:fixed;border-radius:4px;pointer-events:none;z-index:10001;box-shadow:0 0 8px #00e5ffcc,0 0 16px #00e5ff66,inset 0 0 6px #00e5ff4d;animation:voca-glow-pulse .4s ease-out forwards}@keyframes voca-glow-pulse{0%{opacity:0;box-shadow:0 0 4px #00e5ff66,0 0 8px #00e5ff33}40%{opacity:1;box-shadow:0 0 12px #00e5ff,0 0 24px #00e5ff99,inset 0 0 8px #00e5ff66}to{opacity:0;box-shadow:0 0 20px #00e5ff4d,0 0 40px #00e5ff1a}}@media(prefers-reduced-motion:reduce){.voca-catch-particle,.voca-catch-flash,.voca-catch-glow{animation-duration:.01ms!important}}.mcq-player{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--ui-bg, #0b0f14);z-index:1000;display:flex;flex-direction:column}.mcq-header{display:flex;align-items:center;padding:1rem;border-bottom:1px solid var(--ui-border, #22303a)}.mcq-close-btn{background:none;border:none;color:var(--ui-text, #e6eef8);font-size:1.5rem;cursor:pointer;padding:.5rem}.mcq-header h1{flex:1;text-align:center;margin:0;font-size:1.2rem;color:var(--ui-text, #e6eef8)}.mcq-content{flex:1;overflow-y:auto;padding:2rem;display:flex;flex-direction:column;align-items:center;justify-content:center}.mcq-intro{text-align:center;max-width:400px}.mcq-intro h2{margin-bottom:1rem;color:var(--ui-text, #e6eef8)}.mcq-intro>p{color:var(--ui-muted, #9aa6b2)}.mcq-intro-tips{text-align:left;margin:1.5rem 0;padding-left:1rem;list-style:none}.mcq-intro-tips li{margin:.5rem 0;color:var(--ui-muted, #9aa6b2)}.mcq-start-btn{padding:1rem 2rem;font-size:1.2rem;background:var(--ui-accent, #4f9cff);color:#fff;border:none;border-radius:8px;cursor:pointer;transition:opacity .2s}.mcq-start-btn:hover{opacity:.9}.mcq-question-container{width:100%;max-width:600px}.mcq-progress{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;color:var(--ui-muted, #9aa6b2)}.mcq-progress-dots{display:flex;gap:.5rem}.mcq-progress-dots .dot{width:12px;height:12px;border-radius:50%;background:var(--ui-border, #22303a)}.mcq-progress-dots .dot.current{background:var(--ui-accent, #4f9cff)}.mcq-progress-dots .dot.complete.correct{background:#4caf50}.mcq-progress-dots .dot.complete.incorrect{background:var(--ui-danger, #ff6b6b)}.mcq-question{margin-bottom:2rem}.mcq-question .question-type{font-size:2rem;display:block;margin-bottom:.5rem}.mcq-question p{font-size:1.2rem;line-height:1.6;color:var(--ui-text, #e6eef8)}.mcq-question .target-word{margin-top:1rem;color:var(--ui-accent, #4f9cff)}.mcq-options{display:flex;flex-direction:column;gap:1rem;margin-bottom:2rem}.mcq-option{display:flex;align-items:center;padding:1rem 1.5rem;background:var(--ui-surface, #0f1720);border:2px solid var(--ui-border, #22303a);border-radius:8px;cursor:pointer;transition:all .2s;text-align:left;color:var(--ui-text, #e6eef8)}.mcq-option:hover:not(:disabled){border-color:var(--ui-accent, #4f9cff)}.mcq-option.selected{border-color:var(--ui-accent, #4f9cff);background:#4f9cff1a}.mcq-option.correct{border-color:#4caf50;background:#4caf501a}.mcq-option.incorrect{border-color:var(--ui-danger, #ff6b6b);background:#ff6b6b1a}.mcq-option .option-letter{font-weight:700;margin-right:1rem;color:var(--ui-muted, #9aa6b2)}.mcq-option .option-text{flex:1}.mcq-option .option-icon{margin-left:1rem;font-size:1.2rem}.mcq-actions{display:flex;justify-content:center}.mcq-confirm-btn,.mcq-next-btn{padding:1rem 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#9aa6b2)}.score-percent{font-size:1.5rem;color:var(--ui-text, #e6eef8);margin-top:1rem}.perfect-message,.best-score-message{font-size:1.2rem;margin:1rem 0}.perfect-message{color:gold}.best-score-message{color:#4caf50}.mcq-error{color:var(--ui-danger, #ff6b6b);margin:1rem 0}.mcq-results-actions{display:flex;gap:1rem;justify-content:center;margin-top:2rem}.mcq-results-actions button{padding:.8rem 1.5rem;border-radius:8px;cursor:pointer;font-size:1rem}.mcq-results-actions .btn-secondary{background:var(--ui-surface, #0f1720);border:1px solid var(--ui-border, #22303a);color:var(--ui-text, #e6eef8)}.mcq-results-actions .btn-secondary:hover{border-color:var(--ui-accent, #4f9cff)}.mcq-results-actions .btn-primary{background:var(--ui-accent, #4f9cff);border:none;color:#fff}.mcq-results-actions .btn-primary:hover{opacity:.9}.mcq-submitting{text-align:center}.mcq-submitting p{color:var(--ui-muted, #9aa6b2)}.mcq-player .spinner{width:40px;height:40px;border:3px solid var(--ui-border, #22303a);border-top-color:var(--ui-accent, #4f9cff);border-radius:50%;animation:mcq-spin 1s linear infinite;margin:0 auto 1rem}@keyframes mcq-spin{to{transform:rotate(360deg)}}@media(max-width:768px){.mcq-content{padding:1rem}.mcq-question p{font-size:1rem}.mcq-option{padding:.75rem 1rem}.score-circle{width:120px;height:120px}.score-number{font-size:2.5rem}.score-divider,.score-total{font-size:1.5rem}}@media(min-width:768px)and (max-width:1024px){.mcq-question p{font-size:1.3rem}.mcq-option{padding:1.25rem 1.75rem}}.story-reader{position:fixed;top:0;left:0;right:0;bottom:0;background:var(--ui-bg, #0b0f14);z-index:1100;display:flex;flex-direction:column}.story-reader-header{background:var(--ui-surface, #0f1720);border-bottom:1px solid var(--ui-border, #22303a);padding:1rem 1.5rem;flex-shrink:0}.close-button{position:absolute;top:1rem;right:1rem;background:transparent;border:none;font-size:1.5rem;color:var(--ui-muted, #9aa6b2);cursor:pointer;padding:.5rem;line-height:1;transition:color .2s}.close-button:hover{color:var(--ui-text, #e6eef8)}.story-title{font-size:1.5rem;font-weight:600;color:var(--ui-text, #e6eef8);margin:0 0 .5rem;max-width:calc(100% - 10rem)}.text-size-controls{position:absolute;top:1rem;right:4rem;display:flex;gap:.5rem}.text-size-button{background:var(--ui-surface, #0f1720);border:1px solid var(--ui-border, #22303a);color:var(--ui-text, #e6eef8);font-size:.875rem;font-weight:600;padding:.4rem .6rem;border-radius:4px;cursor:pointer;transition:all .2s;line-height:1;min-width:2.5rem}.text-size-button:hover:not(:disabled){background:var(--ui-border, #22303a);border-color:var(--ui-accent, #4f9cff);color:var(--ui-accent, #4f9cff)}.text-size-button:disabled{opacity:.4;cursor:not-allowed}.reading-progress{height:4px;background:var(--ui-border, #22303a);border-radius:2px;overflow:hidden;margin-top:.5rem}.progress-bar{height:100%;background:var(--ui-accent, #4f9cff);transition:width .3s ease}.story-content{flex:1;overflow-y:auto;padding:2rem;-webkit-overflow-scrolling:touch}.story-text{max-width:800px;margin:0 auto;font-size:1.125rem;line-height:1.8;color:var(--ui-text, #e6eef8);font-family:Georgia,Times New Roman,serif}.story-text p{margin-bottom:1.5rem}.story-text h1,.story-text h2,.story-text h3{color:var(--ui-text, #e6eef8);margin-top:2rem;margin-bottom:1rem;font-weight:600}.story-text h1{font-size:2rem}.story-text h2{font-size:1.5rem}.story-text h3{font-size:1.25rem}.finished-cta{max-width:600px;margin:3rem auto;padding:2rem;background:var(--ui-surface, #0f1720);border:1px solid var(--ui-border, #22303a);border-radius:8px;text-align:center}.finished-cta h2{font-size:1.5rem;font-weight:600;color:var(--ui-text, #e6eef8);margin:0 0 1rem}.finished-cta p{font-size:1rem;color:var(--ui-muted, #9aa6b2);margin:0 0 1.5rem}.start-mcq-button{background:var(--ui-accent, #4f9cff);color:#fff;border:none;padding:.75rem 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