:root{--bg-alabaster:#faf9f5;--color-navy:#0f172a;--color-navy-light:#1e293b;--color-amber:#f59e0b;--color-amber-hover:#d97706;--color-stone:#78716c;--border-light:#e7e5e4;--card-bg:#fff;--text-dark:#0f172a;--text-muted:#57534e;--success:#10b981;--font-family:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--radius-sm:8px;--radius-md:14px;--radius-lg:24px;--shadow-sm:0 1px 3px #0000000d;--shadow-md:0 4px 18px -4px #0f172a14;--shadow-lg:0 10px 30px -10px #0f172a1f;--transition:all .25s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}html{height:100%;overflow:hidden}body{font-family:var(--font-family);background-color:var(--bg-alabaster);color:var(--text-dark);-webkit-font-smoothing:antialiased;height:100%;line-height:1.6;overflow:hidden}#root{height:100%;overflow:hidden}a{color:inherit;text-decoration:none}button,input,select,textarea{font-family:inherit}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#e7e5e4;border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#d6d3d1}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes pulseBorder{0%{border-color:var(--border-light)}50%{border-color:var(--color-amber)}to{border-color:var(--border-light)}}@keyframes skeletonShimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-block{background:linear-gradient(90deg,#e7e5e4 25%,#f5f5f4 50%,#e7e5e4 75%) 0 0/200% 100%;border-radius:8px;animation:1.4s ease-in-out infinite skeletonShimmer}.skeleton-card{pointer-events:none}.animate-fade{animation:.4s cubic-bezier(.4,0,.2,1) forwards fadeIn}.snackbar{bottom:max(24px, env(safe-area-inset-bottom,0px));z-index:1200;background-color:var(--color-navy);color:#fff;box-shadow:var(--shadow-lg);pointer-events:none;white-space:nowrap;border-radius:999px;align-items:center;gap:8px;max-width:min(92vw,420px);padding:12px 18px;font-size:13px;font-weight:600;animation:.25s cubic-bezier(.4,0,.2,1) forwards snackbarIn;display:flex;position:fixed;left:50%;transform:translate(-50%)}.snackbar--error{white-space:normal;text-align:center;background-color:#991b1b;line-height:1.35}@keyframes snackbarIn{0%{opacity:0;transform:translate(-50%)translateY(12px)}to{opacity:1;transform:translate(-50%)translateY(0)}}.neo-container{background-color:var(--bg-alabaster);flex-direction:column;width:100%;height:100dvh;max-height:100dvh;display:flex;position:relative;overflow:hidden}.app-scroll,.layout-page-scroll{overscroll-behavior:contain;-webkit-overflow-scrolling:touch;flex-direction:column;flex:1;height:100%;min-height:0;display:flex;overflow:hidden auto}.layout-page-content{box-sizing:border-box;flex-direction:column;width:100%;max-width:1000px;min-height:100%;margin:0 auto;padding:20px 20px 0;display:flex}.layout-page-content:after{content:"";flex-shrink:0;height:40px;display:block}.chat-fab{bottom:max(16px, env(safe-area-inset-bottom,0px));right:max(16px, env(safe-area-inset-right,0px));background-color:var(--color-navy);color:#fff;width:56px;height:56px;box-shadow:var(--shadow-lg);cursor:pointer;z-index:40;border:none;border-radius:50%;justify-content:center;align-items:center;display:flex;position:fixed}@keyframes slideInRight{0%{transform:translate(100%)}to{transform:translate(0)}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-4px)}}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}@keyframes thoughtHeaderIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.thought-header-in{animation:.25s ease-out thoughtHeaderIn}.neo-btn-primary{background-color:var(--color-amber);color:var(--color-navy);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);border:none;justify-content:center;align-items:center;gap:8px;padding:14px 24px;font-weight:600;display:inline-flex}.neo-btn-primary:hover{background-color:var(--color-amber-hover);transform:translateY(-1px)}.neo-btn-primary:active{transform:translateY(0)}.neo-btn-primary:disabled,.neo-btn-primary.neo-btn-primary--disabled{color:#64748b;cursor:not-allowed;opacity:1;background-color:#e2e8f0;transform:none}.neo-btn-primary:disabled:hover,.neo-btn-primary.neo-btn-primary--disabled:hover{background-color:#e2e8f0;transform:none}.neo-btn-secondary{color:var(--color-navy);border-radius:var(--radius-md);border:2px solid var(--color-navy);cursor:pointer;transition:var(--transition);background-color:#0000;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-weight:500;display:inline-flex}.neo-btn-secondary:hover{background-color:#0f172a0d}.neo-input{border-radius:var(--radius-md);border:2px solid var(--border-light);background-color:var(--card-bg);width:100%;color:var(--text-dark);transition:var(--transition);outline:none;padding:14px 18px;font-size:16px}.neo-input:focus{border-color:var(--color-navy);box-shadow:0 0 0 3px #0f172a0a}.neo-input--error{border-color:#fca5a5;box-shadow:0 0 0 3px #ef444414}.neo-input--error:focus{border-color:#ef4444;box-shadow:0 0 0 3px #ef44441f}.form-error-banner{color:#dc2626;text-align:center;background-color:#fef2f2;border:1px solid #fee2e2;border-radius:8px;padding:12px;font-size:13px;line-height:1.4}.form-field-error{color:#dc2626;margin-top:6px;font-size:12px}.form-field-group--error{background-color:#fef2f259;border:2px solid #fca5a5;border-radius:12px;margin:-12px;padding:12px}.form-submit-errors{flex-direction:column;gap:12px;display:flex}.form-submit-errors .form-error-banner{margin:0}.neo-input[type=date]{text-align:left;appearance:none;-webkit-min-logical-width:0;min-width:0;max-width:100%;display:block}.neo-input[type=date]::-webkit-date-and-time-value{text-align:left;min-height:1.25em;line-height:1.25}.neo-input[type=date]::-webkit-datetime-edit{margin:0;padding:0}.neo-input[type=date]::-webkit-datetime-edit-fields-wrapper{padding:0}.neo-input[type=date]::-webkit-calendar-picker-indicator{cursor:pointer;margin-left:auto;padding:0}.neo-card{background-color:var(--card-bg);border-radius:var(--radius-md);border:2px solid var(--border-light);transition:var(--transition);padding:20px;position:relative;overflow:hidden}.neo-card:hover{border-color:var(--color-navy);box-shadow:var(--shadow-md)}.neo-modal-card{background-color:var(--card-bg);border-radius:var(--radius-md);flex-shrink:0;align-self:center;position:relative;overflow:hidden;box-shadow:0 20px 40px #0f172a33}.neo-modal-card .neo-btn-primary:hover,.neo-modal-card .neo-btn-primary:active{transform:none}.quiz-taker-card{overflow:visible}.neo-header{background-color:var(--color-navy);color:#fff;justify-content:space-between;align-items:center;padding:18px 24px;display:flex}.simulation-sandbox-overlay{z-index:9999;box-sizing:border-box;width:100%;height:100dvh;max-height:100dvh;color:var(--text-dark);background-color:#fff;flex-direction:column;margin:0;padding:0;display:flex;position:fixed;inset:0}.simulation-sandbox-header{padding-top:max(10px, env(safe-area-inset-top,0px));padding-right:max(12px, env(safe-area-inset-right,0px));padding-bottom:10px;padding-left:max(16px, env(safe-area-inset-left,0px));background-color:var(--color-navy);color:#fff;box-sizing:border-box;flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;min-height:52px;display:flex}.simulation-sandbox-header-text{flex-direction:column;gap:2px;min-width:0;display:flex}.simulation-sandbox-badge{color:#fff;letter-spacing:.4px;text-transform:uppercase;background-color:#ffffff26;border-radius:999px;align-self:flex-start;padding:2px 8px;font-size:10px;font-weight:700;display:inline-flex}.simulation-sandbox-title{letter-spacing:-.2px;white-space:nowrap;text-overflow:ellipsis;max-width:min(70vw,520px);font-size:14px;font-weight:700;line-height:1.3;overflow:hidden}.simulation-sandbox-done{color:#fff;cursor:pointer;-webkit-tap-highlight-color:transparent;background:#ffffff1f;border:1px solid #ffffff47;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;gap:6px;min-width:44px;min-height:44px;padding:10px 14px;font-size:15px;font-weight:700;transition:background-color .2s;display:inline-flex}.simulation-sandbox-done:hover,.simulation-sandbox-done:focus-visible{background:#ffffff38;outline:none}.simulation-sandbox-done:active{background:#ffffff47}.simulation-sandbox-scroll{-webkit-overflow-scrolling:touch;overscroll-behavior:contain;min-height:0;padding-bottom:env(safe-area-inset-bottom,0px);box-sizing:border-box;background-color:#fff;flex:1;overflow:auto}@media (height<=500px) and (orientation:landscape){.simulation-sandbox-header{min-height:44px;padding-top:max(6px, env(safe-area-inset-top,0px));padding-bottom:6px}.simulation-sandbox-badge{display:none}.simulation-sandbox-done{min-height:40px;padding:8px 12px}}@media (width>=768px){.simulation-sandbox-header{padding-left:max(20px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px))}.simulation-sandbox-title{max-width:640px;font-size:15px}}.neo-badge{color:var(--color-amber-hover);background-color:#f59e0b26;border-radius:20px;padding:4px 10px;font-size:12px;font-weight:600}.neo-glass{-webkit-backdrop-filter:blur(10px);background:#ffffffd9;border:1px solid #ffffff4d}.bubble-chip{border:2px solid var(--border-light);background-color:var(--card-bg);color:var(--text-dark);cursor:pointer;transition:var(--transition);border-radius:30px;padding:10px 18px;font-size:14px;font-weight:500}.bubble-chip:hover{border-color:var(--color-navy)}.bubble-chip.selected{background-color:var(--color-navy);color:#fff;border-color:var(--color-navy)}.progress-circle{background:radial-gradient(closest-side, white 79%, transparent 80% 100%), conic-gradient(var(--success) calc(var(--progress) * 1%), #e7e5e4 0);width:48px;height:48px;color:var(--text-dark);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:700;display:flex}.home-lesson-card{cursor:pointer;grid-template-columns:minmax(0,1fr) auto;gap:4px 12px;padding:18px;display:grid;position:relative}.home-lesson-title{color:var(--color-navy);word-break:break-word;grid-area:1/1;font-size:15px;font-weight:700}.home-lesson-actions{flex-direction:column;grid-area:1/2/3;align-self:stretch;align-items:center;display:flex}.home-lesson-share-btn{border:1px solid var(--border-light);width:36px;height:36px;color:var(--color-navy);cursor:pointer;background-color:#fff;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;transition:background-color .15s,border-color .15s,transform .1s,box-shadow .15s;display:inline-flex}.home-lesson-share-btn:hover{background-color:var(--color-navy-50,#f0f2f8);border-color:var(--color-navy);transform:scale(1.08);box-shadow:0 2px 6px #0000001a}.home-lesson-share-btn:active{box-shadow:none;transform:scale(.95)}.home-lesson-progress{margin-top:auto}.home-lesson-content{grid-area:2/1;min-width:0}.home-lesson-goal{color:var(--text-muted);word-break:break-word;margin-bottom:8px;font-size:12px}.home-lesson-shared-by{color:var(--text-muted);word-break:break-word;align-items:center;gap:4px;margin-bottom:8px;font-size:11px;display:flex}.home-lesson-badges{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.home-lesson-badges .neo-badge{white-space:nowrap;flex-shrink:0;padding:3px 8px;font-size:11px}.quiz-taker-header{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:16px;display:flex}.quiz-taker-label{color:var(--text-muted);letter-spacing:.5px;white-space:nowrap;min-width:0;font-size:12px;font-weight:700}.quiz-taker-badge{white-space:nowrap;flex-shrink:0}.tts-player{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}.tts-player-label{flex-shrink:0;align-items:center;gap:10px;display:flex}.tts-player-controls{flex-wrap:wrap;flex:1;justify-content:flex-end;align-items:center;gap:16px;display:flex}.tts-player-buttons{align-items:center;gap:10px;display:flex}.tts-player-rate{align-items:center;gap:8px;display:flex}.tts-player-rate input[type=range]{width:70px;accent-color:var(--color-navy);cursor:pointer}@media (width<=768px){.home-lesson-card{padding:18px 58px 18px 18px;display:block}.home-lesson-title,.home-lesson-content,.home-lesson-actions{grid-area:auto}.home-lesson-actions{flex-direction:column;justify-content:space-between;align-items:center;width:36px;display:flex;position:absolute;top:18px;bottom:18px;right:18px}.home-lesson-progress{margin-top:0}.quiz-taker-header{flex-direction:column;align-items:flex-start}.quiz-taker-label{white-space:normal;line-height:1.35}.tts-player{flex-direction:column;align-items:stretch}.tts-player-controls{justify-content:space-between;width:100%}}@media (width>=769px){.home-lesson-card{align-items:center}.home-lesson-actions{flex-direction:row;justify-content:flex-end;align-self:center;gap:12px;width:auto;position:static;top:auto;bottom:auto;right:auto}.home-lesson-progress{margin-top:0}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.onboarding-page{box-sizing:border-box;width:100%;max-width:520px;margin:0 auto;padding:24px 24px 40px}.onboarding-header{margin:20px 0 28px}.onboarding-header h1{font-size:22px}.onboarding-header p{margin-top:4px;font-size:13px}@media (width>=769px){.onboarding-page{max-width:800px;padding:40px 48px 60px}.onboarding-header{margin:0 0 36px}.onboarding-header h1{font-size:28px}.onboarding-header p{margin-top:8px;font-size:15px}.onboarding-form{gap:24px}}.onboarding-header-icon{margin-bottom:12px}.onboarding-form{flex-direction:column;gap:20px;display:flex}.onboarding-form>div{min-width:0}.chapter-description ul,.chapter-description ol{margin-top:4px;margin-bottom:4px;padding-left:20px}.chapter-description ul{list-style-type:disc}.chapter-description ol{list-style-type:decimal}.chapter-description li{margin-bottom:2px}.chapter-description p{margin-bottom:4px}.chapter-description p:last-child{margin-bottom:0}.layout-page-content img{border-radius:var(--radius-md);max-width:100%;height:auto;box-shadow:var(--shadow-md);border:1px solid var(--border-light);margin:24px auto;display:block}