:root{--font-family: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--color-brand-primary: #4f46e5;--color-brand-primary-hover: #4338ca;--color-brand-primary-light: #eef2ff;--color-brand-accent: #f59e0b;--color-brand-accent-hover: #d97706;--badge-leitura-bg: #eff6ff;--badge-leitura-text: #1d4ed8;--badge-leitura-border: #bfdbfe;--badge-video-bg: #f5f3ff;--badge-video-text: #6d28d9;--badge-video-border: #ddd6fe;--badge-audio-bg: #fdf2f8;--badge-audio-text: #be185d;--badge-audio-border: #fbcfe8;--badge-quiz-bg: #fffbeb;--badge-quiz-text: #b45309;--badge-quiz-border: #fde68a;--badge-flashcards-bg: #ecfdf5;--badge-flashcards-text: #047857;--badge-flashcards-border: #a7f3d0;--bg-app: #f8fafc;--bg-surface: #ffffff;--bg-surface-subtle: #f1f5f9;--bg-surface-elevated: #ffffff;--text-main: #0f172a;--text-muted: #475569;--text-light: #64748b;--text-on-primary: #ffffff;--border-subtle: #e2e8f0;--border-focus: #4f46e5;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, .05);--shadow-md: 0 4px 6px -1px rgba(15, 23, 42, .07), 0 2px 4px -2px rgba(15, 23, 42, .05);--shadow-lg: 0 10px 25px -3px rgba(15, 23, 42, .08), 0 4px 6px -4px rgba(15, 23, 42, .03);--shadow-hover: 0 14px 28px -4px rgba(79, 70, 229, .12), 0 8px 10px -6px rgba(15, 23, 42, .04);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .22s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-app);color:var(--text-main);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid 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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 1.25rem;display:flex;align-items:center;justify-content:center;font-size:2rem}.student-state-icon.loading{background:var(--color-brand-primary-light);color:var(--color-brand-primary);animation:pulse-spin 1.4s ease-in-out infinite}.student-state-icon.empty{background:#f1f5f9;color:#64748b}.student-state-icon.error{background:#fef2f2;color:#ef4444}.student-state-title{font-size:1.35rem;font-weight:800;color:var(--text-main);margin-bottom:.5rem}.student-state-desc{font-size:.95rem;color:var(--text-muted);line-height:1.6;margin-bottom:1.5rem}.btn-state-action{display:inline-flex;align-items:center;justify-content:center;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-state-action:hover{background:var(--color-brand-primary-hover)}@keyframes pulse-spin{0%{transform:scale(.95) rotate(0)}50%{transform:scale(1.05) rotate(180deg)}to{transform:scale(.95) rotate(360deg)}}@media(max-width:768px){.study-roadmap-sidebar{display:none}.btn-open-roadmap{display:inline-flex}.study-session-body{flex-direction:column}.study-activity-stage{padding:1.5rem 1.25rem}}@media(max-width:640px){.student-header-inner{padding:.75rem 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}}