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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)}}@media(max-width:768px){.study-roadmap-sidebar{display:none}.study-session-body{flex-direction:column}.study-activity-stage{padding:1.5rem 1.25rem}.module-activity-tabs{display:flex;position:sticky;top:var(--student-header-height, 57px);z-index:35;background:#fffffff5;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--border-subtle);padding:0 .5rem;box-shadow:0 2px 6px #0f172a0a}.module-activity-tabs-track{display:flex;align-items:center;gap:.25rem;width:100%;overflow-x:auto;overflow-y:hidden;white-space:nowrap;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:.35rem 0}.module-activity-tabs-track::-webkit-scrollbar{display:none}.module-tab-btn{display:inline-flex;align-items:center;gap:.4rem;padding:.65rem .85rem;border:none;border-bottom:2px solid 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1rem}.student-brand-title{font-size:1.1rem}.student-main{padding:1rem .75rem 2.5rem}.student-hero{padding:1.5rem 1.25rem;border-radius:var(--radius-lg);margin-bottom:1.5rem}.student-hero h1{font-size:1.45rem}.student-hero p{font-size:.95rem}.student-cards-grid{grid-template-columns:1fr;gap:1rem}.study-session-container{border-radius:var(--radius-lg)}.study-top-bar{padding:.85rem 1rem;flex-direction:column;align-items:flex-start}.study-step-indicator{width:100%;justify-content:space-between}.study-activity-stage{padding:1.25rem 1rem}.study-activity-title{font-size:1.25rem}.study-nav-bar{padding:.85rem 1rem}.btn-nav-study{flex:1;justify-content:center;padding:.75rem .5rem}}