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.quiz-option-letter{background:#34d399;color:#fff;border-color:#34d399}.quiz-option-item.dimmed{opacity:.55;background:#f8fafc;border-color:#e2e8f0}.quiz-option-letter{width:30px;height:30px;border-radius:50%;background:#fff;border:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;color:var(--text-muted);flex-shrink:0;transition:all var(--transition-fast)}.quiz-option-text-wrap{display:flex;flex:1;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.5rem}.quiz-option-text{line-height:1.4}.quiz-option-correct-badge{font-size:.75rem;font-weight:700;background:#dcfce7;color:#15803d;padding:.2rem .55rem;border-radius:var(--radius-full)}.quiz-feedback-box{margin-top:1.25rem;border-radius:var(--radius-md);padding:1.15rem 1.25rem;animation:feedbackFadeIn .25s ease-out}@keyframes feedbackFadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.quiz-feedback-box.correct{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46}.quiz-feedback-box.incorrect{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}.quiz-feedback-header{display:flex;align-items:center;gap:.5rem;font-size:1.05rem;font-weight:800;margin-bottom:.4rem}.quiz-feedback-icon{font-size:1.1rem}.quiz-feedback-body{font-size:.95rem;line-height:1.5;margin:0}.quiz-action-next-wrap{margin-top:1.5rem;display:flex;justify-content:flex-end}.btn-quiz-next{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;background:var(--color-brand-primary);color:#fff;border:none;border-radius:var(--radius-md);font-size:.95rem;font-weight:700;cursor:pointer;min-height:48px;transition:background var(--transition-fast)}.btn-quiz-next:hover{background:var(--color-brand-primary-hover)}.quiz-summary-box{text-align:center;padding:2.5rem 1.5rem}.quiz-summary-icon{font-size:3rem;margin-bottom:.75rem}.quiz-summary-title{font-size:1.5rem;font-weight:800;color:var(--text-main);margin-bottom:.5rem}.quiz-summary-score{font-size:1.25rem;font-weight:700;color:var(--color-brand-primary);margin-bottom:.75rem}.quiz-summary-badge{display:inline-block;padding:.35rem .85rem;background:var(--bg-surface-subtle);border:1px solid var(--border-subtle);border-radius:var(--radius-full);font-size:.9rem;color:var(--text-muted);margin-bottom:1rem}.quiz-summary-message{font-size:.95rem;color:var(--text-muted);max-width:440px;margin:0 auto 1.75rem;line-height:1.5}.btn-quiz-retry{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.75rem;background:var(--color-brand-primary);color:#fff;border:none;border-radius:var(--radius-md);font-size:.95rem;font-weight:700;cursor:pointer;min-height:48px;transition:background var(--transition-fast)}.btn-quiz-retry:hover{background:var(--color-brand-primary-hover)}.flashcards-renderer-container{max-width:600px;margin:0 auto;text-align:center}.flashcard-display-box{background:linear-gradient(135deg,#fff,#f0fdf4);border:2px solid var(--badge-flashcards-border);border-radius:var(--radius-xl);padding:2.5rem 2rem;min-height:240px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:var(--shadow-md);cursor:pointer;transition:all var(--transition-normal);-webkit-user-select:none;user-select:none}.flashcard-display-box:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}.flashcard-side-label{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--badge-flashcards-text);margin-bottom:1rem}.flashcard-content-text{font-size:1.35rem;font-weight:700;color:var(--text-main);line-height:1.4;margin-bottom:1rem}.flashcard-hint-text{font-size:.85rem;color:var(--text-light);font-style:italic}.flashcard-controls{display:flex;align-items:center;justify-content:center;gap:1rem;margin-top:1.25rem}.student-state-container{text-align:center;padding:3.5rem 1.5rem;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);max-width:540px;margin:2rem auto}.student-state-icon{width:72px;height:72px;border-radius:50%;margin:0 auto 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rotate(180deg)}to{transform:scale(.95) rotate(360deg)}}.mobile-content-toolbar{display:none}.desktop-content-toolbar{display:flex;justify-content:flex-end;margin-bottom:.65rem;padding-bottom:.35rem;border-bottom:1px solid var(--border-subtle)}.content-accessibility-toolbar{width:100%}.content-toolbar-inner{display:flex;align-items:center;justify-content:flex-end;height:100%}.content-toolbar-controls{display:inline-flex;align-items:center;gap:.35rem}.btn-font-scale{display:inline-flex;align-items:center;justify-content:center;min-width:30px;height:24px;padding:0 .35rem;border:1px solid var(--border-subtle);border-radius:var(--radius-sm);background:#fff;color:var(--text-muted);font-size:.75rem;font-weight:700;cursor:pointer;transition:all var(--transition-fast);font-family:inherit;-webkit-user-select:none;user-select:none;touch-action:manipulation}.btn-font-scale:hover:not(:disabled){color:var(--color-brand-primary);border-color:#c7d2fe;background:var(--color-brand-primary-light)}.btn-font-scale:disabled{opacity:.35;cursor:not-allowed}.flashcards-renderer-container{max-width:600px;margin:0 auto;display:flex;flex-direction:column;gap:1.25rem}.flashcard-display-box{background:#fff;border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:2.25rem 1.5rem;min-height:220px;height:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;cursor:pointer;transition:all var(--transition-fast);overflow-wrap:break-word;word-break:break-word}.flashcard-display-box:hover{border-color:var(--color-brand-primary);box-shadow:var(--shadow-hover)}.flashcard-side-label{font-size:.75rem;font-weight:700;color:var(--text-light);text-transform:uppercase;letter-spacing:.05em;margin-bottom:1rem}.flashcard-content-text{font-weight:700;color:var(--text-main);line-height:1.4;margin-bottom:1rem;max-width:100%}.flashcard-hint-text{font-size:.9rem;font-style:italic;color:var(--text-muted);margin-top:.5rem}.flashcard-controls{display:flex;align-items:center;justify-content:space-between;padding:0 .5rem}@media(max-width:768px){.student-header{position:fixed;top:0;left:0;right:0;height:var(--student-header-height);z-index:50;background:#fffffffa;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border-subtle);box-shadow:0 1px 3px #0f172a0a}.student-header-inner{height:100%;padding:0 1rem;max-width:1024px;margin:0 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var(--transition-fast),border-color var(--transition-fast);font-family:inherit}.module-tab-btn:hover{color:var(--text-main)}.module-tab-btn.tab-current{color:var(--color-brand-primary);border-bottom:2px solid var(--color-brand-primary);font-weight:700;background:transparent}.module-tab-btn.tab-visited{color:#334155}.module-tab-visited-indicator{color:#059669;font-size:.75rem;font-weight:800;margin-left:.15rem}.module-tab-btn.tab-future{color:var(--text-light)}.module-tab-icon{font-size:.95rem;line-height:1}.module-tab-label{line-height:1}.desktop-item-tabs,.desktop-content-toolbar{display:none!important}.mobile-item-tabs{display:block;position:fixed;top:calc(var(--student-header-height) + var(--student-tabs-height));left:0;right:0;height:var(--student-item-tabs-height);z-index:44;background:#f8fafcfa;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border-subtle);box-shadow:0 1px 3px #0f172a08}.mobile-item-tabs .activity-item-tabs-track{max-width:1024px;margin:0 auto;padding:0 .75rem;height:100%;display:flex;align-items:center;gap:.35rem;overflow-x:auto;overflow-y:hidden;white-space:nowrap;-webkit-overflow-scrolling:touch;scrollbar-width:none}.mobile-item-tabs .activity-item-tabs-track::-webkit-scrollbar{display:none}.mobile-item-tabs .activity-item-tab-btn{display:inline-flex;align-items:center;gap:.35rem;padding:0 .65rem;height:28px;border:1px solid var(--border-subtle);border-radius:var(--radius-full);background:#fff;color:var(--text-muted);font-size:.775rem;font-weight:600;cursor:pointer;flex-shrink:0;white-space:nowrap;touch-action:manipulation;transition:all var(--transition-fast);font-family:inherit}.mobile-item-tabs .activity-item-tab-btn:hover{color:var(--text-main);border-color:#cbd5e1}.mobile-item-tabs .activity-item-tab-btn.tab-active{color:var(--color-brand-primary);background:var(--color-brand-primary-light);border-color:#c7d2fe;font-weight:700}.mobile-item-tabs .item-tab-index-badge{display:inline-flex;align-items:center;justify-content:center;width:16px;height:16px;border-radius:50%;background:#e2e8f0;color:#475569;font-size:.65rem;font-weight:700;line-height:1}.mobile-item-tabs .activity-item-tab-btn.tab-active .item-tab-index-badge{background:var(--color-brand-primary);color:#fff}.mobile-content-toolbar{display:block;position:fixed;top:calc(var(--student-header-height) + var(--student-tabs-height));left:0;right:0;height:var(--student-content-toolbar-height);z-index:43;background:#f8fafcfa;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border-subtle);box-shadow:0 1px 2px #0f172a05}.study-session-container.has-item-tabs .mobile-content-toolbar{top:calc(var(--student-header-height) + var(--student-tabs-height) + var(--student-item-tabs-height))}.mobile-content-toolbar .content-toolbar-inner{max-width:1024px;margin:0 auto;padding:0 .85rem;height:100%}.student-bottom-nav{display:block;position:fixed;bottom:0;left:0;right:0;height:calc(var(--student-bottom-nav-height) + env(safe-area-inset-bottom,0px));z-index:50;background:#fffffffa;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-top:1px solid var(--border-subtle);box-shadow:0 -2px 10px #0f172a0d;padding-bottom:env(safe-area-inset-bottom,0px)}.student-bottom-nav-inner{max-width:1024px;margin:0 auto;height:var(--student-bottom-nav-height);display:flex;align-items:center;justify-content:space-around;padding:0 1rem}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:transparent;border:none;color:var(--text-light);cursor:pointer;padding:6px 20px;border-radius:var(--radius-sm);font-family:inherit;font-size:.72rem;font-weight:600;transition:all var(--transition-fast);text-decoration:none;min-width:64px;min-height:44px}.bottom-nav-item:hover{color:var(--color-brand-primary)}.bottom-nav-item.is-active{color:var(--color-brand-primary);font-weight:700}.bottom-nav-item.is-disabled{opacity:.45;cursor:not-allowed}.bottom-nav-icon{display:flex;align-items:center;justify-content:center;line-height:1}.bottom-nav-label{line-height:1}.student-main{padding-top:calc(var(--student-header-height) + 12px);padding-bottom:calc(var(--student-bottom-nav-height) + env(safe-area-inset-bottom,0px) + 24px);padding-left:.75rem;padding-right:.75rem}.study-session-breadcrumb{display:none}.study-session-container{margin-top:calc(var(--student-tabs-height) + var(--student-content-toolbar-height) - 4px);border-radius:var(--radius-lg)}.study-session-container.has-item-tabs{margin-top:calc(var(--student-tabs-height) + var(--student-item-tabs-height) + var(--student-content-toolbar-height) - 4px)}.study-roadmap-sidebar{display:none}.study-session-body{flex-direction:column}.study-activity-stage{padding:1.25rem 1rem;scroll-margin-top:calc(var(--student-header-height) + var(--student-tabs-height) + var(--student-item-tabs-height) + var(--student-content-toolbar-height) + 10px)}}@media(max-width:640px){.student-header-inner{padding:0 .85rem}.student-brand-title{font-size:1.1rem}.student-main{padding-top:calc(var(--student-header-height) + 8px);padding-bottom:calc(var(--student-bottom-nav-height) + env(safe-area-inset-bottom,0px) + 20px);padding-left:.5rem;padding-right:.5rem}.student-hero{padding:1.5rem 1.25rem;border-radius:var(--radius-lg);margin-bottom:1.25rem}.student-hero h1{font-size:1.4rem}.student-hero p{font-size:.92rem}.student-cards-grid{grid-template-columns:1fr;gap:1rem}.study-session-container{border-radius:var(--radius-md)}.study-top-bar{padding:.5rem .75rem}.study-activity-stage{padding:1rem .75rem}.reading-title{font-size:1.15rem}.study-activity-title{font-size:1.2rem}.study-nav-bar{padding:.75rem .85rem}.btn-nav-study{flex:1;justify-content:center;padding:.75rem .5rem}}