@import"https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap";.streak-badge[data-v-59f159fa]{display:inline-flex;align-items:center;gap:3px;font-size:.82rem;font-weight:700;padding:3px 10px;border-radius:999px;background:#f973161f;border:1px solid rgba(249,115,22,.3);color:#f97316;cursor:default;-webkit-user-select:none;user-select:none;transition:background .2s,border-color .2s}.streak-badge--today[data-v-59f159fa]{background:#f9731638;border-color:#f973168c}.streak-badge--pop[data-v-59f159fa]{animation:streak-pop-59f159fa .55s cubic-bezier(.34,1.56,.64,1)}@keyframes streak-pop-59f159fa{0%{transform:scale(1)}40%{transform:scale(1.35)}to{transform:scale(1)}}@media (min-width: 768px){.hdr-nav-wrap[data-v-29814818]{display:none}}@media (max-width: 600px){.hdr-nav-wrap[data-v-29814818]{display:none}}.hdr-nav-wrap[data-v-29814818]{position:relative}.hdr-nav-btn[data-v-29814818]{background:transparent;border:1px solid var(--border);border-radius:var(--radius-pill);padding:5px 13px;color:var(--text-muted);font-size:1.1rem;letter-spacing:2px;line-height:1;cursor:pointer;transition:all .18s}.hdr-nav-btn[data-v-29814818]:hover,.hdr-nav-btn--on[data-v-29814818]{border-color:var(--accent);color:var(--accent);background:color-mix(in srgb,var(--accent) 6%,transparent)}.hdr-nav-backdrop[data-v-29814818]{position:fixed;top:0;right:0;bottom:0;left:0;z-index:899}.hdr-nav-dropdown[data-v-29814818]{position:fixed;background:var(--surface-elevated);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);z-index:900;overflow:hidden;min-width:190px}.hdr-nav-item[data-v-29814818]{display:flex;align-items:center;gap:10px;width:100%;padding:11px 16px;background:transparent;border:none;color:var(--text);font-size:.88rem;font-weight:600;cursor:pointer;text-align:left;transition:background .15s;font-family:var(--font-display)}.hdr-nav-item[data-v-29814818]:hover{background:var(--primary-light)}.hdr-nav-item--active[data-v-29814818]{color:var(--accent)}.hdr-nav-item+.hdr-nav-item[data-v-29814818]{border-top:1px solid var(--border)}*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #1a2332;--primary-light: #263445;--primary-lighter: #2d3f54;--accent: #4ecdc4;--accent-hover: #45b8b0;--secondary: #4ecdc4;--tertiary: #FFE66D;--level-a1: #4ECDC4;--level-a2: #95E1D3;--level-b1: #FFE66D;--level-b2: #FF6B6B;--level-c1: #C44569;--level-c2: #B066D4;--context-functional: #4ecdc4;--context-social: #ffb84d;--context-complex: #ff6b6b;--bg: #0d1520;--surface: #1a2332;--surface-elevated: #263445;--text: #E6F1FF;--text-muted: #a0aec0;--text-faint: #8892B0;--border: rgba(78, 205, 196, .2);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-pill: 999px;--radius-circle: 50%;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--content-pad: 40px;--success: #22c55e;--success-dark: #16a34a;--success-light: rgba(34, 197, 94, .12);--success-border: rgba(34, 197, 94, .35);--error: #ef4444;--error-dark: #dc2626;--error-light: rgba(239, 68, 68, .12);--error-border: rgba(239, 68, 68, .35);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--font-display: "Outfit", sans-serif;--font-mono: "JetBrains Mono", monospace}body{font-family:var(--font-display);background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}.app-container{position:relative;z-index:1;max-width:1200px;margin:0 auto;padding:20px;min-height:100vh;display:flex;flex-direction:column}.toast{position:fixed;bottom:30px;left:50%;transform:translate(-50%) translateY(100px);background:var(--surface-elevated);border:1px solid var(--accent);color:var(--text);padding:12px 24px;border-radius:var(--radius-pill);box-shadow:var(--shadow-lg);font-weight:600;font-size:.9rem;opacity:0;transition:all .4s cubic-bezier(.175,.885,.32,1.275);z-index:2000;display:flex;align-items:center;gap:10px}.toast.show{transform:translate(-50%) translateY(0);opacity:1}.toast--success{border-color:#22c55e}.toast--error{border-color:#ef4444;color:#ef4444}.toast--info{border-color:var(--accent)}.app-header{text-align:center;margin-bottom:30px;animation:slideDown .6s ease;position:relative}.app-header-toggle{position:absolute;bottom:-12px;left:50%;transform:translate(-50%);background:var(--surface-elevated);border:1px solid var(--border);border-radius:999px;padding:1px 10px;font-size:.7rem;color:var(--text-muted);cursor:pointer;z-index:10;transition:color .15s,border-color .15s;line-height:1.6}.app-header-toggle:hover{color:var(--accent);border-color:var(--accent)}.app-header-body{overflow:hidden;max-height:400px;transition:max-height .35s ease,opacity .25s ease;opacity:1;padding-bottom:12px}.app-header-body .header-toolbar{margin-top:10px}.app-header--collapsed{margin-bottom:8px}.app-header--collapsed .app-header-body{max-height:0!important;opacity:0}@keyframes slideDown{0%{opacity:0;transform:translateY(-30px)}to{opacity:1;transform:translateY(0)}}.logo{font-size:2.5rem;font-weight:800;background:linear-gradient(135deg,var(--accent),#FF6B6B);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:4px;letter-spacing:-1px;line-height:1.2}.tagline{font-size:1.05rem;color:var(--text-muted);letter-spacing:.5px;font-weight:500;margin-bottom:12px}.user-level-badge{display:inline-block;padding:6px 16px;background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-pill);font-size:.8rem;font-weight:600;color:var(--accent);font-family:var(--font-mono)}.nav-tabs{display:flex;gap:8px;margin-bottom:30px;padding:6px;background:var(--surface);border-radius:var(--radius-lg);border:1px solid var(--border);flex-wrap:wrap;width:90%;margin-left:auto;margin-right:auto}.nav-tab{flex:1;min-width:100px;padding:12px;background:transparent;border:none;border-radius:var(--radius-md);color:var(--text-muted);font-size:.85rem;font-weight:600;cursor:pointer;transition:all .3s;font-family:var(--font-display);display:flex;align-items:center;justify-content:center;gap:6px}.nav-tab-icon{font-size:.9rem;line-height:1}.nav-tab-label{display:inline}.nav-tab:hover{color:var(--text);background:#4ecdc412}.nav-tab.active{color:var(--bg);background:linear-gradient(135deg,var(--accent),#45b8b0);box-shadow:var(--shadow-sm)}@media (max-width: 600px){.nav-tabs{position:fixed;bottom:0;left:0;right:0;z-index:150;margin:0;padding:0;gap:0;width:100%;border-radius:0;border:none;border-top:1px solid var(--border);background:var(--surface-elevated);box-shadow:0 -2px 16px #0003;flex-wrap:nowrap;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}.nav-tab{flex:1;flex-direction:column;gap:3px;padding:8px 4px 10px;min-width:0;min-height:56px;border-radius:0;font-size:.62rem}.nav-tab-icon{font-size:1.25rem}.nav-tab-label{font-size:.6rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.nav-tab.active{color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,transparent)}}.tab-content{display:none;width:90%;margin-left:auto;margin-right:auto}.tab-content.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes blockFadeIn{0%{opacity:0;transform:translateY(8px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.lesson-header{background:var(--surface);border:1px solid var(--border);border-radius:16px 16px 0 0;padding:24px;margin-bottom:0}.lesson-header h3{font-size:.75rem;text-transform:uppercase;color:var(--accent);letter-spacing:1px;margin-bottom:4px;font-weight:600}.lesson-header h2{font-size:1.1rem;font-weight:700;color:var(--text);line-height:1.3}.lesson-level-badge{background:var(--accent);color:var(--bg);padding:10px 20px;border-radius:var(--radius-pill);font-weight:700;font-size:.9rem;text-align:center;line-height:1.3}.dialogue-nav-bar{display:flex;flex-direction:column;align-items:center;gap:10px;padding:14px 20px;background:var(--primary-light);border:1px solid var(--border);border-radius:16px 16px 0 0}.dialogue-nav-bar-row1{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;width:100%}.dialogue-nav-levels{display:flex;gap:6px;flex-wrap:wrap;align-items:center}.dialogue-nav-levels .level-btn{padding:6px 14px;font-size:.8rem;margin-bottom:0}.dialogue-nav-select{width:100%;max-width:360px;padding:7px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:.85rem;font-family:var(--font-display);cursor:pointer;text-align:center}.dialogue-nav-select:focus{outline:none;border-color:var(--accent)}.subtopic-nav-strip{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 20px;background:var(--surface);border-left:1px solid var(--border);border-right:1px solid var(--border)}.subtopic-nav-strip .btn-nav{flex-shrink:0;padding:8px 18px;font-size:.85rem}.subtopic-footer-info{flex:1;text-align:center;font-size:.78rem;color:var(--text-muted);line-height:1.4;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.subtopic-footer-info strong{display:block;color:var(--text);font-size:.85rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.step-tabs{display:grid;grid-template-columns:repeat(5,1fr);background:var(--primary-light);border-left:1px solid var(--border);border-right:1px solid var(--border)}.step-tab{padding:16px;text-align:center;font-size:.9rem;font-weight:600;color:var(--text-muted);border-right:1px solid rgba(255,255,255,.05);position:relative;cursor:pointer;transition:color .2s,background .2s;-webkit-user-select:none;user-select:none}.step-tab:not(.active):not(.completed):hover{color:var(--text);background:#4ecdc412}.step-tab:last-child{border-right:none}.step-tab.active{background:linear-gradient(135deg,var(--accent),var(--accent-hover));color:var(--bg);border-bottom:none}.step-tab.active .step-tab-icon,.step-tab.active .step-tab-label{color:var(--bg)}.step-tab.completed{background:#4ecdc421;color:var(--accent);border-right-color:#4ecdc414}.step-tab.completed .step-tab-icon,.step-tab.completed .step-tab-label{color:var(--accent)}.step-content-wrapper{background:var(--surface);border:1px solid var(--border);border-top:none;border-radius:0 0 16px 16px;padding:var(--content-pad);min-height:500px}@keyframes scw-group-end{0%,to{box-shadow:none}50%{box-shadow:0 -4px 18px -3px var(--group-color, #3b82f6)}}.step-content-wrapper.scw--group-end{border-top-width:3px!important;animation:scw-group-end 1.4s ease-in-out infinite}.dialogue-audio-btn{background:transparent;border:2px solid var(--accent);color:var(--accent);padding:14px 28px;border-radius:var(--radius-pill);font-size:1rem;font-weight:700;cursor:pointer;transition:all .3s;display:block;width:fit-content;margin:0 auto 40px;font-family:var(--font-display)}.dialogue-audio-btn:hover{background:var(--accent);color:var(--bg);transform:translateY(-2px);box-shadow:0 4px 12px #4ecdc44d}.dialogue-audio-btn.completed{background:var(--success);border-color:var(--success);color:#fff}.dialogue-audio-btn.completed:hover{background:var(--success-dark);border-color:var(--success-dark)}.dialogue-lines{display:flex;flex-direction:column;gap:16px;margin-bottom:30px}.dialogue-line{background:var(--primary-light);border-radius:var(--radius-md);padding:20px;position:relative;cursor:pointer;transition:all .3s;display:flex;align-items:center;gap:16px}.dialogue-line:hover{background:var(--primary-lighter)}.dialogue-line.active{background:var(--primary-lighter);border-left:3px solid var(--accent)}.speaker-avatar{width:48px;height:48px;border-radius:var(--radius-circle);background:var(--accent);color:var(--bg);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.2rem;flex-shrink:0}.speaker-avatar.speaker-2{background:#ff6b6b}.line-content{flex:1}.line-main-text{font-size:1.1rem;color:var(--text);line-height:1.5;margin-bottom:8px}.line-translation{font-size:.95rem;color:var(--text-muted);font-style:italic;display:none;margin-top:12px;padding-top:12px;border-top:1px solid rgba(255,255,255,.05)}.line-translation.show{display:block}.line-transliteration{font-size:.95rem;color:#95e1d3;font-style:italic;display:none;margin-top:8px;font-family:var(--font-mono);letter-spacing:.3px}.line-transliteration.show{display:block}.line-main-text b,.line-transliteration b,.line-translation b{color:var(--accent);font-weight:700}.line-audio-btn{width:44px;height:44px;border-radius:var(--radius-circle);background:transparent;border:2px solid var(--border);color:var(--text-muted);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;flex-shrink:0;font-size:1.2rem}.line-audio-btn:hover{border-color:var(--accent);color:var(--accent);background:#4ecdc41a}.click-hint{text-align:center;color:var(--text-muted);font-size:.9rem;margin-top:20px;font-style:italic}.step-nav-hint{font-size:.9em;color:var(--text-muted);font-style:italic}.step-nav-hint strong{color:var(--accent);font-style:normal}.patterns-grid{display:grid;gap:24px}.pattern-section{background:var(--primary-light);padding:24px;border-radius:var(--radius-md);border-left:4px solid var(--accent)}.pattern-section h3{font-size:1.1rem;color:var(--accent);margin-bottom:16px;font-weight:700}.keyword-list{display:flex;flex-wrap:wrap;gap:8px}.keyword{background:#4ecdc426;border:1px solid rgba(78,205,196,.3);padding:8px 16px;border-radius:var(--radius-pill);font-size:.9rem;font-weight:600;color:var(--accent);font-family:var(--font-mono);transition:border-color .15s,box-shadow .15s,background .15s}.keyword--active{border-color:#22c55e!important;box-shadow:0 0 0 2px #22c55e47,0 0 12px #22c55e2e;background:#22c55e1a!important;color:#22c55e!important}.info-box{background:#4ecdc41a;border-left:4px solid var(--accent);padding:16px;border-radius:0 8px 8px 0;margin-bottom:20px}.info-box strong{color:var(--accent);display:block;margin-bottom:8px}.quiz-container{text-align:center;padding:20px 0}.quiz-instruction{font-size:1.2rem;color:var(--text);margin-bottom:30px;font-weight:500}.quiz-audio-btn{background:var(--accent);border:none;color:var(--bg);padding:18px 36px;border-radius:var(--radius-md);font-size:1.1rem;font-weight:700;cursor:pointer;margin-bottom:40px;transition:all .3s;display:inline-flex;align-items:center;gap:12px;font-family:var(--font-display)}.quiz-audio-btn:hover{background:var(--accent-hover);transform:translateY(-3px);box-shadow:0 8px 20px #4ecdc44d}.section-play-btn{background:transparent;border:2px solid var(--accent);color:var(--accent);padding:6px 14px 6px 10px;border-radius:var(--radius-pill);font-size:.82rem;font-weight:700;cursor:pointer;transition:all .2s;display:inline-flex;align-items:center;gap:6px;font-family:var(--font-display);flex-shrink:0}.section-play-btn:hover{background:var(--accent);color:var(--bg);transform:translateY(-1px);box-shadow:0 4px 10px #4ecdc440}.section-play-btn.playing{background:var(--accent);color:var(--bg);animation:pulse-play 1s ease-in-out infinite}@keyframes pulse-play{0%,to{opacity:1}50%{opacity:.7}}.quiz-audio-btn.playing,.line-audio-btn.playing{animation:pulse-play 1s ease-in-out infinite;border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 3px #4ecdc42e}.quiz-audio-btn.playing{background:var(--accent-hover);color:var(--bg)}.audio-wave{display:inline-flex;align-items:center;gap:2px;height:14px}.audio-wave span{display:inline-block;width:3px;border-radius:2px;background:currentColor;animation:audio-wave-bar .65s ease-in-out infinite}.audio-wave span:nth-child(1){height:6px;animation-delay:0s}.audio-wave span:nth-child(2){height:12px;animation-delay:.1s}.audio-wave span:nth-child(3){height:8px;animation-delay:.2s}.audio-wave span:nth-child(4){height:14px;animation-delay:.05s}.audio-wave span:nth-child(5){height:5px;animation-delay:.15s}@keyframes audio-wave-bar{0%,to{transform:scaleY(.4);opacity:.6}50%{transform:scaleY(1);opacity:1}}.quiz-input{width:100%;max-width:600px;padding:18px 24px;font-size:1.2rem;background:var(--primary-light);border:2px solid var(--border);border-radius:var(--radius-md);color:var(--text);font-family:var(--font-display);transition:all .2s;margin:0 auto 20px;display:block}.quiz-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #4ecdc41a}.quiz-input.correct{border-color:var(--success);background:#22c55e1a}.quiz-input.wrong{border-color:#ff6b6b;background:#ff6b6b1a}.quiz-feedback{margin-top:20px;padding:16px 24px;border-radius:var(--radius-md);font-weight:600;font-size:1rem;display:none}.quiz-feedback.show{display:block}.quiz-feedback.correct{background:var(--success-light);color:var(--success);border:1px solid var(--success-border)}.quiz-feedback.wrong{background:#ff6b6b26;color:#ff6b6b;border:1px solid rgba(255,107,107,.3)}.lesson-footer{display:flex;justify-content:space-between;align-items:center;margin-top:40px;gap:16px}.btn-nav{padding:14px 32px;border-radius:var(--radius-md);font-weight:700;cursor:pointer;transition:all .3s;font-size:1rem;font-family:var(--font-display);border:none}.btn-nav.secondary{background:transparent;border:2px solid var(--border);color:var(--text-muted)}.btn-nav.secondary:hover{border-color:var(--accent);color:var(--accent)}.btn-nav.primary{background:var(--accent);color:var(--bg)}.btn-nav.primary:hover{background:var(--accent-hover);transform:translateY(-2px);box-shadow:0 6px 20px #4ecdc44d}.btn-nav:disabled{opacity:.4;cursor:not-allowed;transform:none}.level-selector{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}.level-btn{padding:10px 18px;border-radius:var(--radius-pill);border:2px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer;font-weight:600;font-size:.9rem;transition:all .3s;font-family:var(--font-display)}.level-btn:hover{border-color:var(--text-muted)}.level-btn.active{color:var(--bg);border-color:transparent}.level-btn[data-level=A1].active{background:var(--level-a1)}.level-btn[data-level=A2].active{background:var(--level-a2)}.level-btn[data-level=B1].active{background:var(--level-b1)}.level-btn[data-level=B2].active{background:var(--level-b2)}.level-btn[data-level=C1].active{background:var(--level-c1)}.level-btn[data-level=C2].active{background:var(--level-c2)}.level-continue-btn{display:flex;align-items:center;gap:12px;width:100%;margin:0 auto 20px;padding:14px 22px;border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:700;cursor:pointer;font-family:var(--font-display);color:var(--bg);background:linear-gradient(135deg,var(--accent),#45b8b0);box-shadow:0 4px 12px #4ecdc44d;transition:all .25s;animation:slideDown .2s ease}.level-continue-btn:hover{transform:translateY(-2px);box-shadow:0 6px 18px #4ecdc466}.level-continue-btn .btn-icon{font-size:1.3rem;flex-shrink:0}.level-continue-btn .btn-label{flex:1;text-align:left;line-height:1.3}.level-continue-btn .btn-arrow{font-size:1.1rem;opacity:.8}.subtopics-list{display:grid;gap:16px;width:100%;margin:0 auto}.subtopic-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;cursor:pointer;transition:all .3s}.subtopic-item:hover{border-color:var(--accent);transform:translate(4px);box-shadow:var(--shadow-md)}.subtopic-item.completed{border-color:var(--success);background:#22c55e0d}.subtopic-item.locked{background:var(--surface);border-color:var(--border);opacity:.5;cursor:not-allowed;filter:grayscale(60%)}.subtopic-item.locked:hover{border-color:var(--border);transform:none;box-shadow:none}.subtopic-item.unlocked{border-color:var(--accent);background:#4ecdc408;box-shadow:0 0 0 1px var(--accent)}.subtopic-item.unlocked:hover{box-shadow:0 0 0 2px var(--accent),var(--shadow-md)}.subtopic-item.studied{border-color:var(--success);background:#22c55e0d}.subtopic-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:16px}.subtopic-title{font-weight:700;color:var(--text);font-size:1.1rem;margin-bottom:8px}.subtopic-meta{font-size:.85rem;color:var(--text-muted)}.subtopic-progress{display:flex;gap:8px;flex-shrink:0}.context-dot{width:12px;height:12px;border-radius:var(--radius-circle);background:var(--border);transition:all .3s}.context-dot.completed{background:var(--success)}.contexts-preview{display:flex;gap:8px;flex-wrap:wrap}.context-mini-badge{padding:4px 12px;border-radius:var(--radius-pill);font-size:.75rem;font-weight:600}.context-mini-badge.functional{background:#4ecdc426;color:var(--context-functional)}.context-mini-badge.social{background:#ffb84d26;color:var(--context-social)}.context-mini-badge.complex{background:#ff6b6b26;color:var(--context-complex)}.test-options{display:flex;flex-direction:column;gap:12px}.test-option{padding:16px 24px;background:var(--primary-light);border-radius:var(--radius-md);cursor:pointer;transition:all .2s;font-size:1rem;border:2px solid transparent;text-align:left}.test-option:hover{background:var(--primary-lighter);border-color:var(--accent)}.test-option.correct{border-color:var(--success);background:#22c55e1a}.test-option.wrong{border-color:#ff6b6b;background:#ff6b6b1a}.empty-state{text-align:center;padding:60px 20px;max-width:600px;margin:0 auto}.empty-state-icon{font-size:4rem;display:block;margin-bottom:20px}.empty-state h3{font-size:1.5rem;font-weight:700;margin-bottom:12px}.empty-state p{color:var(--text-muted);font-size:1rem;line-height:1.6;margin-bottom:28px}.empty-state-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:32px}.empty-state-btn{padding:14px 28px;border-radius:var(--radius-md);font-weight:700;cursor:pointer;transition:all .3s;font-size:.95rem;border:none;font-family:var(--font-display)}.empty-state-btn-primary{background:var(--accent);color:var(--bg)}.empty-state-btn-primary:hover{background:var(--accent-hover);transform:translateY(-2px)}.empty-state-btn-secondary{background:var(--surface-elevated);border:2px solid var(--border);color:var(--text)}.empty-state-btn-secondary:hover{border-color:var(--accent);color:var(--accent)}.empty-state-features{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}.empty-state-feature{text-align:center}.empty-state-feature-icon{font-size:2rem;margin-bottom:8px}.empty-state-feature-text{font-size:.85rem;color:var(--text-muted);font-weight:600}.focus-mode-btn{position:fixed;bottom:30px;right:30px;width:50px;height:50px;background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-circle);font-size:1.2rem;cursor:pointer;box-shadow:var(--shadow-md);z-index:1000;transition:all .3s}.focus-mode-btn:hover{border-color:var(--accent);transform:scale(1.1)}body.focus-mode .app-header,body.focus-mode .nav-tabs,body.focus-mode .selectors-row,body.focus-mode .subtopic-header,body.focus-mode .context-tabs-bar{display:none!important}body.focus-mode .focus-mode-btn{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 25%,transparent)}.keyboard-hint{position:fixed;bottom:90px;right:30px;background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px 20px;font-size:.8rem;color:var(--text-muted);line-height:2;display:none;z-index:1000}.keyboard-hint kbd{background:var(--primary-lighter);padding:2px 8px;border-radius:4px;font-family:var(--font-mono);color:var(--text);font-size:.8rem}.course-modal{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;z-index:5000;display:flex;align-items:center;justify-content:center;padding:20px;opacity:0;transition:opacity .3s}.course-modal.visible{opacity:1}.course-modal-content{background:var(--surface);border-radius:var(--radius-xl);padding:32px;max-width:480px;width:100%;border:1px solid var(--border);box-shadow:var(--shadow-lg);transform:scale(.95);transition:transform .3s}.course-modal.visible 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cubic-bezier(.4,0,.2,1)}.vb-ctx-enter-from{opacity:0;transform:translate(20px)}.vb-ctx-leave-to{opacity:0;transform:translate(-20px)}.vb-step-trans-enter-active,.vb-step-trans-leave-active{transition:opacity .2s ease}.vb-step-trans-enter-from,.vb-step-trans-leave-to{opacity:0}.sa-fade-enter-active,.sa-fade-leave-active{transition:all .4s ease}.sa-fade-enter-from{opacity:0;transform:translateY(10px)}.sa-fade-leave-to{opacity:0;transform:translateY(-10px)}