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button{padding:1em;font-size:1.1em;font-weight:700;border-radius:12px;border:none;cursor:pointer;transition:all .2s ease;background-color:var(--primary-purple);color:#fff}.games-modal-content .game-selection-grid button:hover{background-color:var(--secondary-pink)}.image-preview-container{width:100%;max-height:300px;background-color:var(--dark-bg);border:2px dashed var(--border-color);border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:1.5rem;position:relative;overflow:hidden}.image-preview-container img,.image-preview-container video{width:100%;height:100%;object-fit:contain}.image-preview-placeholder{color:var(--text-dark);text-align:center}.flashfoto-controls{display:flex;gap:1rem;margin-bottom:1.5rem}.flashfoto-controls button{flex:1}.ai-recommendation{background-color:var(--dark-bg);border:1px solid var(--primary-purple);border-radius:12px;padding:1rem;margin-top:1.5rem;text-align:center}.ai-recommendation p{margin:0 0 1rem;color:var(--text-soft)}.ai-recommendation-actions{display:flex;gap:1rem;justify-content:center}.ai-recommendation-actions button{background-color:var(--primary-purple);color:#fff;border:none;padding:.6em 1.2em;border-radius:8px;font-weight:700;cursor:pointer}.ai-recommendation-actions button.danger,.start-stop-btn.cancel-action{background-color:var(--danger-red)}.usage-counter{position:absolute;top:1rem;right:1.5rem;background-color:var(--dark-bg);color:var(--secondary-pink);padding:.3em .8em;border-radius:20px;font-size:.8em;font-weight:700;border:1px solid var(--secondary-pink)}.upload-cancel-container{text-align:center;margin-top:1rem;margin-bottom:1rem}.cancel-upload-btn{background:none;border:1px solid var(--danger-red);color:var(--danger-red);padding:.4em 1em;border-radius:20px;font-size:.9em;cursor:pointer;transition:all .2s ease}.cancel-upload-btn:hover{background-color:var(--danger-red);color:#fff}.in-game-controls{position:absolute;bottom:1rem;right:1rem;display:flex;gap:.5rem;z-index:1002}.in-game-controls button{background-color:#1f2937cc;border:1px solid var(--border-color);color:var(--text-light);padding:.5em 1em;border-radius:8px;cursor:pointer}.game-pause-overlay{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.5rem;color:var(--text-light)}.game-pause-overlay h2{font-size:2.5rem;margin:0}.game-start-button{font-size:4rem;font-weight:700;color:#fff;background:var(--brand-gradient);border:none;padding:.5em 1.5em;border-radius:20px;cursor:pointer;animation:pulse-blue 2s infinite}.game-play-mode-selector{display:flex;background-color:var(--content-bg);border-radius:30px;padding:5px;border:1px solid var(--border-color)}.game-mode-btn{padding:.6em 1.2em;border:none;background:none;color:var(--text-dark);font-weight:500;border-radius:25px;cursor:pointer;transition:all .3s ease}.game-mode-btn.active{background-color:var(--primary-purple);color:#fff}.game-landing-voice-selector{width:100%;max-width:250px}.in-game-voice-selector{position:absolute;bottom:1rem;left:50%;transform:translate(-50%);width:250px;max-width:90%;z-index:1002}.continuous-play-notice{font-size:1rem;font-style:italic;color:var(--text-dark);margin-top:1rem}.how-to-play-overlay .modal-content{max-width:600px;text-align:left;max-height:85vh;overflow-y:auto}.how-to-play-title{font-size:1.8rem;color:var(--primary-purple);text-align:center;margin-bottom:1.5rem}.how-to-play-content h3{font-size:1.2rem;color:var(--secondary-pink);margin-top:1.5rem;margin-bottom:.5rem}.how-to-play-content p,.how-to-play-content li{color:var(--text-soft);line-height:1.6}.how-to-play-content ul{list-style-type:none;padding-left:0}.how-to-play-content li{padding-left:1em;text-indent:-1em}.how-to-play-content .modal-actions{justify-content:center;margin-top:2rem}.study-area-main{display:flex;flex-direction:column;align-items:center;width:100%}.study-area-footer{display:flex;flex-direction:column;align-items:center;width:100%;max-width:900px}.card-selection{position:relative;z-index:10;pointer-events:all;cursor:pointer}.card-selection input[type=checkbox]{-webkit-appearance:checkbox!important;-moz-appearance:checkbox!important;appearance:checkbox!important;display:block!important;width:20px!important;height:20px!important;min-width:20px!important;min-height:20px!important;background-color:#fff!important;border:1px solid #6b7280!important;border-radius:4px!important;cursor:pointer!important;z-index:10!important}.card-selection input[type=checkbox]:checked{background-color:var(--primary-purple)!important;border-color:var(--primary-purple)!important}.folder-card-list .card{position:relative}.how-to-play-overlay{z-index:1002}.reaction-container{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:1rem;width:100%}.reaction-side{display:flex;align-items:center;justify-content:center;gap:.5rem;flex-wrap:wrap}.reaction-arrow-group{display:flex;flex-direction:column;align-items:center;text-align:center}.reagents{font-size:.8em;color:var(--text-soft);margin-bottom:-.5rem}.arrow{font-size:2.5rem;font-weight:700;color:var(--secondary-pink);line-height:1}.plus-sign{font-size:1.5rem;font-weight:700;margin:0 .5rem}@media (max-width: 480px){.game-landing-title{font-size:2.5rem;line-height:1.1}.game-landing-actions{display:flex;flex-direction:column;width:90%;gap:.75rem}.game-action-btn{width:100%;font-size:1rem;padding:.8em 1em}.game-question{font-size:1.2rem}}@media (max-width: 480px){.game-header{padding:0 .5rem;flex-wrap:wrap;justify-content:center;gap:.5rem}.game-header h3{font-size:1rem;order:1;width:100%;text-align:center}.game-info{font-size:.8rem;order:2}.game-header .viewer-close-btn{order:3;position:absolute;top:0;right:.5rem}}.exam-button-in-folder{padding:.8em 1.5em!important;font-size:1em!important;font-weight:700!important;border-radius:8px;color:#fff;cursor:pointer;flex-shrink:0;border:none;background-color:var(--gold)!important}.exam-folder-list{list-style:none;padding:0;margin:1.5rem 0;max-height:250px;overflow-y:auto;text-align:left;border:1px solid var(--border-color);border-radius:8px;padding:.5rem}.exam-folder-list li{padding:.5rem}.exam-folder-list li label{display:flex;align-items:center;gap:.75rem;font-size:1.1em;cursor:pointer}.exam-folder-list input[type=checkbox]{width:20px;height:20px}.exam-config-group{margin-bottom:1.5rem;text-align:left}.exam-config-group label{display:block;font-weight:500;margin-bottom:.5rem;color:var(--text-soft)}.exam-viewer-overlay{justify-content:flex-start;padding:1rem;display:flex;flex-direction:column}.exam-question-container{background-color:var(--content-bg);border:1px solid var(--border-color);border-radius:12px;padding:2rem;width:100%;max-width:800px;margin:0 auto;font-size:1.2rem;line-height:1.6;text-align:left;min-height:100px;word-break:break-word}.answer-choices{width:100%;max-width:800px;margin:2rem auto;display:grid;grid-template-columns:1fr;gap:1rem}.choice-btn{display:flex;align-items:center;gap:1rem;width:100%;padding:.8rem 1rem;font-size:1rem;text-align:left;background-color:var(--content-bg);color:var(--text-light);border:1px solid var(--border-color);border-radius:8px;cursor:pointer;transition:all .2s ease}.choice-btn:not(:disabled):hover{border-color:var(--primary-purple);background-color:#2a3647}.choice-btn:disabled{cursor:not-allowed;opacity:.7}.choice-letter{flex-shrink:0;width:30px;height:30px;border-radius:50%;border:1px solid var(--primary-purple);color:var(--primary-purple);font-weight:700;display:flex;align-items:center;justify-content:center}.exam-footer{margin-top:auto;padding-top:1rem;width:100%;max-width:800px;margin-left:auto;margin-right:auto;display:flex;justify-content:flex-end}.exam-next-btn{background:var(--brand-gradient);color:#fff;border:none;padding:.8em 2em;font-size:1.1em;font-weight:700;border-radius:30px;cursor:pointer}.choice-btn.correct,.choice-btn.correct .choice-letter{background-color:var(--success-green);border-color:var(--success-green);color:#fff}.choice-btn.incorrect,.choice-btn.incorrect .choice-letter{background-color:var(--danger-red);border-color:var(--danger-red);color:#fff}.choice-btn:disabled:not(.correct):not(.incorrect){opacity:.6}.explanation-container{width:100%;max-width:800px;margin:1rem auto 0;padding:1.5rem;background-color:var(--content-bg);border:1px solid var(--border-color);border-radius:12px;text-align:left;max-height:45vh;overflow-y:auto;animation:fadeIn .5s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.explanation-container h3{margin-top:0;color:var(--primary-purple)}.explanation-container p{line-height:1.6}.explanation-container ul{list-style:none;padding-left:0;margin-top:1rem;color:var(--text-soft)}.explanation-container li{margin-bottom:.5rem}.exam-results-container{background-color:var(--content-bg);padding:2rem 3rem;border-radius:16px;box-shadow:0 10px 30px #0006;width:100%;max-width:500px;text-align:center;margin:auto}.exam-results-container h2{font-size:2rem;margin-top:0;color:var(--text-light)}.final-score-percent{font-size:4.5rem;font-weight:700;color:transparent;background-clip:text;-webkit-background-clip:text;background-image:var(--brand-gradient);margin:1rem 0}.final-score-details{font-size:1.2rem;color:var(--text-soft);margin-bottom:2rem}.explanation-modal-content{padding:1rem;background-color:var(--dark-bg);border-radius:8px;margin:1.5rem 0;max-height:50vh;overflow-y:auto;text-align:left;border:1px solid var(--border-color)}.explanation-modal-content p{line-height:1.6}.explanation-modal-content ul{list-style:none;padding-left:0;margin-top:1rem;color:var(--text-soft)}.explanation-modal-content li{margin-bottom:1rem;padding-bottom:1rem;border-bottom:1px solid var(--border-color);padding-left:.5rem;border-left:2px solid var(--border-color)}.explanation-modal-content li:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.explanation-modal-content li.correct-explanation strong{color:var(--success-green)}.exam-header{width:100%;max-width:800px;display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;position:relative}.exam-header h2{background-image:var(--brand-gradient);background-clip:text;-webkit-background-clip:text;color:transparent;font-size:1.8rem;margin:0;font-weight:700}.exam-header-progress{position:absolute;left:50%;transform:translate(-50%);font-size:1rem;font-weight:500;color:var(--text-dark);white-space:nowrap}.exam-header .flag-btn{position:absolute;left:75%;transform:translate(-50%);font-size:1em;font-weight:700;color:var(--text-dark);background-color:var(--content-bg);border:1px solid var(--border-color);border-radius:20px;padding:.4em .8em;cursor:pointer;transition:all .2s ease;white-space:nowrap;display:inline-flex;align-items:center;gap:.3em;justify-content:center}.exam-header .flag-btn.active{color:#fff;background-color:var(--secondary-pink);border-color:var(--secondary-pink)}.exam-header .viewer-close-btn{padding:0;line-height:1}.exam-history-container{margin-top:2rem}.exam-history-list{list-style:none;padding:0;margin:0;max-height:300px;overflow-y:auto}.retake-exam-item{padding:1rem;background-color:var(--dark-bg);border:1px solid var(--border-color);border-radius:8px;margin-bottom:.5rem;cursor:pointer;transition:background-color .2s ease,border-color .2s ease}.retake-exam-item:hover{background-color:var(--content-bg);border-color:var(--primary-purple)}.exam-history-list{list-style:none;padding:0;margin:0;max-height:400px;overflow-y:auto}.exam-history-list li{display:flex;align-items:center;gap:1rem;padding:1rem .5rem;border-bottom:1px solid var(--border-color)}.exam-history-list li:last-child{border-bottom:none}.history-score{font-size:1.5rem;font-weight:700;color:var(--gold);flex-basis:60px;text-align:right}.history-details{display:flex;flex-direction:column;gap:.25rem}.history-title{font-weight:500;color:var(--text-light)}.history-date{font-size:.8em;color:var(--text-dark)}.progress-overlay{background-color:#111827cc;z-index:2000}.progress-modal-content{display:flex;flex-direction:column;align-items:center;gap:1.5rem;color:var(--text-light);font-size:1.2rem;font-weight:500}.spinner{width:60px;height:60px;border:5px solid var(--border-color);border-top:5px solid var(--primary-purple);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.login-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}.login-modal{background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-secondary) 100%);border:1px solid var(--border-color);border-radius:20px;padding:0;max-width:440px;width:100%;box-shadow:0 25px 50px -12px #00000080;animation:modalSlideIn .3s ease-out;overflow:hidden}@keyframes modalSlideIn{0%{opacity:0;transform:translateY(-20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.login-modal-header{display:flex;align-items:center;justify-content:space-between;padding:2rem 2rem 1rem;border-bottom:1px solid var(--border-color)}.login-modal-header h3{margin:0;font-size:1.5rem;font-weight:600;color:var(--text-primary)}.login-modal-close{background:none;border:none;font-size:1.5rem;color:var(--text-dark);cursor:pointer;padding:.25rem;line-height:1;border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.login-modal-close:hover{background:var(--bg-secondary);color:var(--text-primary)}.login-modal-content{padding:1.5rem 2rem 2rem}.login-subtitle{margin:0 0 2rem;color:var(--text-dark);text-align:center;line-height:1.5}.google-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:12px;padding:14px 20px;background:#fff;color:#1f2937;border:1px solid #e5e7eb;border-radius:12px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease;margin-bottom:1.5rem}.google-btn:hover{background:#f9fafb;border-color:#d1d5db;transform:translateY(-1px);box-shadow:0 4px 12px #0000001a}.divider{display:flex;align-items:center;margin:1.5rem 0;color:var(--text-dark);font-size:.875rem}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--border-color)}.divider span{padding:0 1rem}.email-form{margin-bottom:1rem}.input-group{display:flex;flex-direction:column;gap:12px}.email-input{width:100%;padding:14px 16px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;color:var(--text-primary);font-size:1rem;transition:all .2s ease;box-sizing:border-box}.email-input:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px #8b5cf61a}.email-input::placeholder{color:var(--text-dark)}.magic-link-btn{width:100%;padding:14px 20px;background:linear-gradient(135deg,var(--accent-color) 0%,#7c3aed 100%);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease}.magic-link-btn:hover{transform:translateY(-1px);box-shadow:0 8px 25px #8b5cf64d}.login-status{margin-top:1rem;padding:12px 16px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:8px;color:var(--text-dark);font-size:.875rem;text-align:center}.guest-option{margin-top:1.5rem;text-align:center}.guest-btn{background:none;border:1px solid var(--border-color);color:var(--text-dark);padding:12px 24px;border-radius:12px;cursor:pointer;font-size:.875rem;transition:all .2s ease}.guest-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.user-info{display:flex;align-items:center;gap:16px;padding:20px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;margin-bottom:2rem}.user-avatar{width:48px;height:48px;background:linear-gradient(135deg,var(--accent-color) 0%,#7c3aed 100%);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0}.user-details{flex:1}.user-status{font-weight:500;color:var(--text-primary);margin-bottom:4px}.user-email{color:var(--text-dark);font-size:.875rem}.login-actions{display:flex;gap:12px}.btn-primary{flex:1;padding:14px 20px;background:linear-gradient(135deg,var(--accent-color) 0%,#7c3aed 100%);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 25px #8b5cf64d}.btn-secondary{flex:1;padding:14px 20px;background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);border-radius:12px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-secondary:hover{background:var(--bg-primary);transform:translateY(-1px)}.toast-container{position:fixed;right:16px;bottom:16px;z-index:2000;display:flex;flex-direction:column;gap:8px}.toast{padding:10px 14px;border-radius:10px;border:1px solid rgba(255,255,255,.12);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);color:#e5e7eb;box-shadow:0 10px 20px #00000059}.toast.info{background:#1e293bb3}.toast.success{background:#10b9812e;border-color:#10b98159;color:#bbf7d0}.toast.error{background:#ef44442e;border-color:#ef444459;color:#fecaca}@media (max-width: 389px){.flashcard-viewer .fv-header h2{font-size:14px}.flashcard-viewer .fv-card{min-height:180px}.flashcard-viewer .fv-card .card-face{min-height:180px;padding:12px}.flashcard-viewer .fv-card .card-face p{font-size:14px;line-height:1.35}.flashcard-viewer .fv-card .flag-btn{top:6px;right:6px;font-size:18px}.flashcard-viewer .fv-nav{gap:8px}.flashcard-viewer .fv-nav button{padding:8px 10px;font-size:12px}.flashcard-viewer .fv-nav span{font-size:12px}.flashcard-viewer .fv-controls{grid-template-columns:1fr!important;gap:10px}.flashcard-viewer .fv-controls .custom-select-trigger{padding:10px 12px;font-size:13px}.flashcard-viewer .fv-controls label{font-size:11px}.flashcard-viewer input[type=range]{width:100%}.flashcard-viewer .fv-controls .grid>button{padding:10px 12px;font-size:13px}}