:root{color-scheme:light;--bg:#fafaf9;--surface:#f5f5f4;--border:#e5e7eb;--text:#111827;--text-secondary:#6b7280;--text-muted:#9ca3af;--purple:#7c3aed;--purple-soft:#a78bfa;--purple-bg:#f3f0ff;--purple-active:#ede9fe;--purple-border:#c4b5fd;--font-app:system-ui,-apple-system,sans-serif}[data-theme=dark]{color-scheme:dark;--bg:#0f0f0f;--surface:#1a1a1a;--border:#2a2a2a;--text:#f9fafb;--text-secondary:#9ca3af;--text-muted:#6b7280;--purple:#7c3aed;--purple-soft:#a78bfa;--purple-bg:#1e1033;--purple-active:#2a1a4a;--purple-border:#4c2a8a}[data-theme=dark] .font-card,[data-theme=dark] .icon-option,[data-theme=dark] .modal,[data-theme=dark] .text-input,[data-theme=dark] .textarea{background:var(--surface)}[data-theme=dark] .brain-name{color:var(--text)}*{box-sizing:border-box;margin:0;padding:0}html{font-size:100%}body,html{height:100%;background:var(--bg);color:var(--text);font-family:var(--font-app);font-weight:400}body{font-size:.875rem}button{font-family:inherit}.app{display:flex;height:100vh;background:var(--bg);overflow:hidden}.sidebar{width:220px;background:var(--surface);border-right:.5px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}.sidebar-top{padding:16px;border-bottom:.5px solid var(--border)}.logo{font-size:.9375rem;font-weight:500;color:var(--text);gap:8px}.logo,.logo-button{display:flex;align-items:center}.logo-button{background:none;border:none;padding:0;cursor:pointer}.logo-dot{width:22px;height:22px;border-radius:50%;background:var(--purple);display:flex;align-items:center;justify-content:center}.logo-dot svg{width:12px;height:12px;fill:none;stroke:white;stroke-width:2}.brain-label{font-size:.625rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;padding:12px 16px 6px}.brain-item{display:flex;align-items:center;gap:8px;padding:7px 16px;cursor:pointer;border:none;background:none;width:100%;text-align:left;opacity:.6}.brain-item.active{background:var(--purple-active);border-radius:6px;margin:0 8px;padding:7px 8px;width:auto;opacity:1}.brain-item.active .brain-name{color:var(--purple);font-weight:500}.brain-icon{width:28px;height:28px;border-radius:6px;background:var(--purple-bg);display:flex;align-items:center;justify-content:center;font-size:.8125rem;flex-shrink:0;color:var(--purple)}.brain-name{font-size:.8125rem;color:#374151}.brain-score{margin-left:auto;font-size:.6875rem;color:#6b7280}.brain-delete,.brain-edit{display:flex;align-items:center;color:#6b7280;opacity:0;transition:opacity .12s ease;cursor:pointer}.brain-edit{margin-left:8px}.brain-delete{margin-left:6px}.brain-item:hover .brain-delete,.brain-item:hover .brain-edit{opacity:.7}.brain-edit:hover{color:var(--purple);opacity:1}.brain-delete:hover{color:#ef4444;opacity:1}.add-brain{display:flex;align-items:center;gap:8px;padding:7px 16px;color:var(--text-muted);font-size:.8125rem;cursor:pointer;margin-top:4px;border:none;background:none;width:100%;text-align:left}.nav-section{padding:8px;margin-top:auto;border-top:.5px solid var(--border)}.nav-item{display:flex;align-items:center;gap:8px;padding:8px;border-radius:6px;cursor:pointer;color:var(--text-secondary);font-size:.8125rem;border:none;background:none;width:100%;text-align:left}.nav-item.active,.nav-item:hover{background:var(--purple-active);color:var(--purple)}.nav-item svg{width:16px;height:16px;flex-shrink:0}.main{flex:1 1;flex-direction:column;overflow:hidden}.main,.tabs{display:flex}.tabs{border-bottom:.5px solid var(--border);background:var(--bg);padding:0 20px}.tab{padding:12px 16px;font-size:.8125rem;color:var(--text-secondary);cursor:pointer;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-.5px;display:flex;align-items:center;gap:6px}.tab.active{color:var(--purple);border-bottom-color:var(--purple);font-weight:500}.tab:disabled{opacity:.4;cursor:default}.tab svg{width:14px;height:14px}.content{flex:1 1;overflow:hidden;position:relative}.panel{position:absolute;inset:0;padding:20px;overflow-y:auto}.panel.hidden{display:none}.btn-primary{background:linear-gradient(135deg,#a78bfa,#7c3aed);color:white;border:none;border-radius:8px;padding:10px 16px;font-size:.8125rem;font-weight:500;cursor:pointer}.btn-primary:disabled{cursor:default;opacity:.85;animation:pulse 1.4s ease-in-out infinite}.btn-ghost{background:none;border:.5px solid var(--border);border-radius:6px;color:var(--text-secondary);font-size:.75rem;padding:4px 10px;cursor:pointer}.textarea{width:100%;background:white;color:var(--text);border:.5px solid var(--border);border-radius:10px;padding:12px;font-size:.8125rem;font-family:inherit;resize:vertical;outline:none}.modal-backdrop{position:fixed;inset:0;background:rgba(17,24,39,.28);display:flex;align-items:center;justify-content:center;z-index:50}.modal{background:white;border:.5px solid var(--border);border-radius:14px;box-shadow:0 12px 40px rgba(17,24,39,.18);width:min(520px,calc(100vw - 32px));max-height:calc(100vh - 64px);overflow:auto;padding:20px}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.modal-title{font-size:.9375rem;font-weight:600;color:var(--text)}.modal-close{background:none;border:none;color:var(--text-muted);font-size:1.25rem;line-height:1;cursor:pointer;padding:0 4px}.modal-close:hover{color:var(--text)}.field-label{display:block;font-size:.75rem;font-weight:500;color:var(--text-secondary);margin-bottom:6px}.text-input{width:100%;background:white;color:var(--text);border:.5px solid var(--border);border-radius:8px;padding:9px 12px;font-size:.8125rem;font-family:inherit;outline:none}.text-input:focus{border-color:var(--purple-border)}.icon-grid{display:grid;grid-template-columns:repeat(6,1fr);grid-gap:6px;gap:6px}.icon-option{background:white;border:.5px solid var(--border);border-radius:8px;padding:8px 0;font-size:1.125rem;cursor:pointer;line-height:1;display:flex;align-items:center;justify-content:center;color:var(--text)}.icon-option:hover{background:var(--surface)}.icon-option.selected{border-color:var(--purple);background:var(--purple-bg)}.form-error{margin-top:12px;font-size:.75rem;color:#b91c1c}.graph-panel{padding:0;display:flex;flex-direction:column}.graph-toolbar{display:flex;align-items:center;gap:8px;padding:10px 16px;border-bottom:.5px solid var(--border)}.graph-toolbar-label{font-size:.75rem;color:var(--text-secondary)}.legend-row{margin-left:auto;gap:2px;flex-wrap:wrap}.legend-item,.legend-row{display:flex;align-items:center}.legend-item{font-size:.6875rem;color:var(--text-secondary);gap:4px;margin-right:12px}.legend-dot{width:10px;height:10px;border-radius:50%;display:inline-block}.graph-area{flex:1 1;position:relative;background:var(--bg);overflow:hidden}.chat-area{display:flex;flex-direction:column;height:100%;padding:0}.messages{flex:1 1;padding:16px 20px;display:flex;flex-direction:column;gap:12px;overflow-y:auto}.msg{display:flex;gap:10px;align-items:flex-start}.msg.user{flex-direction:row-reverse}.avatar{width:28px;height:28px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:.6875rem;font-weight:500}.avatar.feynman{background:var(--purple);color:white}.avatar.user{background:var(--border);color:#374151}.bubble{max-width:340px;padding:10px 14px;border-radius:12px;font-size:.8125rem;line-height:1.5}.bubble.feynman{background:var(--purple-bg);color:var(--text);border-bottom-left-radius:3px}.bubble.user{background:var(--purple);color:white;border-bottom-right-radius:3px}.bubble-hint{margin-top:8px;font-size:.75rem;color:var(--text-secondary)}.badge-row{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}.score-badge{display:inline-flex;align-items:center;gap:4px;background:#ecfdf5;color:#16523a;font-size:.6875rem;padding:2px 8px;border-radius:10px;font-weight:500}.score-badge.weak-badge{background:#fef2f2;color:#ef4444}.voice-bar{padding:12px 20px;border-top:.5px solid var(--border);display:flex;align-items:center;gap:10px;background:var(--bg)}.concept-chip{background:var(--purple-bg);color:var(--purple);font-size:.6875rem;padding:3px 10px;border-radius:10px;font-weight:500;border:.5px solid var(--purple-border);white-space:nowrap;max-width:160px;overflow:hidden;text-overflow:ellipsis}.concept-chip.empty{background:var(--surface);color:var(--text-muted);border-color:var(--border)}.record-btn{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#a78bfa,#7c3aed);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;position:relative}.record-btn:disabled{opacity:.5;cursor:default}.record-btn svg{width:16px;height:16px;color:white}.record-btn.recording{background:#ef4444;animation:pulse 1.2s ease-in-out infinite}.record-btn .rec-dot{position:absolute;top:-2px;right:-2px;width:10px;height:10px;border-radius:50%;background:#ef4444;border:2px solid var(--bg)}.chat-input-wrap{flex:1 1;position:relative}.voice-live{flex:1 1;display:flex;align-items:center;gap:12px;height:36px;padding:0 14px;border:.5px solid var(--purple-border,#c4b5fd);border-radius:8px;background:var(--purple-bg,#f3f0ff);overflow:hidden}.voice-pulse{--level:0;flex-shrink:0;width:12px;height:12px;border-radius:50%;background:#ef4444;transform:scale(calc(1 + var(--level) * .9));box-shadow:0 0 0 calc(var(--level) * 6px) rgba(239,68,68,.18);transition:transform .06s linear}.voice-live-text{flex:1 1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-input,.voice-live-text{font-size:.8125rem;color:var(--text)}.chat-input{width:100%;height:36px;border:.5px solid var(--border);border-radius:8px;padding:0 12px;background:white;outline:none;font-family:inherit}.send-btn{width:32px;height:32px;border-radius:6px;background:var(--purple);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0}.send-btn:disabled{opacity:.5;cursor:default}.send-btn svg{width:14px;height:14px;color:white}.summary-grid{display:grid;grid-template-columns:1fr 1fr 1fr;grid-gap:10px;gap:10px;margin-bottom:20px}.summary-card{background:var(--surface);border-radius:8px;padding:12px}.summary-label{font-size:.6875rem;color:var(--text-muted);margin-bottom:4px}.summary-value{font-size:1.375rem}.section-header,.summary-value{font-weight:500;color:var(--text)}.section-header{font-size:.8125rem;margin-bottom:12px}.concept-row{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:.5px solid var(--border)}.concept-row:last-child{border-bottom:none}.concept-name{font-size:.8125rem;color:var(--text);flex:1 1}.progress-bar-wrap{width:100px;height:6px;background:var(--border);border-radius:3px;overflow:hidden}.progress-bar-fill{height:100%;border-radius:3px}.pct-label{font-size:.6875rem;color:var(--text-secondary);min-width:32px;text-align:right}.status-pill{font-size:.625rem;padding:2px 7px;border-radius:8px;font-weight:500}.how-step{display:flex;gap:14px;padding:14px 0;border-bottom:.5px solid var(--border)}.how-step:last-child{border-bottom:none}.step-num{width:28px;height:28px;border-radius:50%;background:var(--purple);color:white;font-size:.75rem;font-weight:500;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}.step-title{font-size:.8125rem;font-weight:500;color:var(--text);margin-bottom:3px}.step-body{font-size:.75rem;color:var(--text-secondary);line-height:1.5}.step-tag{display:inline-block;font-size:.625rem;background:var(--purple-bg);color:var(--purple);padding:2px 7px;border-radius:8px;margin-top:5px;font-weight:500}.step-tag.green{background:#ecfdf5;color:#16523a}.empty-state{max-width:460px;margin:8% auto 0;text-align:center}.empty-title{font-size:1rem;font-weight:500;margin-bottom:6px}.empty-body{font-size:.8125rem;color:var(--text-secondary);margin-bottom:16px}.muted{color:var(--text-muted)}.error-text{color:#ef4444;font-size:.8125rem;margin-top:8px}details>summary{cursor:pointer;color:var(--text-secondary);font-size:.75rem}@keyframes pulse{0%,to{opacity:1}50%{opacity:.55}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-thumb{background:#e0e0de;border-radius:4px}.settings-tab{max-width:620px}.settings-title{font-size:1.125rem;font-weight:600;color:var(--text);margin-bottom:16px}.settings-section{padding:16px 0;border-top:.5px solid var(--border)}.settings-header{font-size:.625rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;margin-bottom:14px}.settings-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:8px 0}.settings-label{font-size:.8125rem;color:var(--text);font-weight:500}.settings-sublabel{font-size:.75rem;color:var(--text-muted);margin-top:2px;max-width:380px}.font-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:8px;gap:8px}.font-card{text-align:left;background:var(--surface);border:.5px solid var(--border);border-radius:8px;padding:10px 12px;cursor:pointer}.font-card.selected{border:2px solid var(--purple);background:var(--purple-bg)}.font-card-label{font-size:.75rem;font-weight:500;color:var(--text);margin-bottom:4px}.font-card-preview{font-size:.8125rem;color:var(--text-secondary)}.landing{position:fixed;inset:0;z-index:10;transition:opacity .6s ease,visibility .6s ease}.landing.hidden{opacity:0;visibility:hidden;pointer-events:none}.app-wrapper{opacity:0;transition:opacity .6s ease .3s}.app-wrapper.visible{opacity:1}.landing-root{position:absolute;inset:0;background:var(--bg);overflow:hidden}.landing-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:24px;background:radial-gradient(ellipse 60% 55% at 50% 50%,color-mix(in srgb,var(--bg) 92%,transparent) 0,color-mix(in srgb,var(--bg) 62%,transparent) 50%,transparent 100%)}.landing-eyebrow{font-size:.8125rem;color:var(--purple);letter-spacing:.12em;text-transform:uppercase;font-weight:500;margin-bottom:16px}.landing-logo{transform:scale(1.5);margin-bottom:30px}.landing-title{font-size:3rem;color:var(--text);font-weight:500;line-height:1.15}.landing-sub{font-size:1rem;color:var(--text-secondary);margin-top:16px}.cta-button{margin-top:32px;padding:14px 32px;border-radius:10px;background:linear-gradient(135deg,#a78bfa,#7c3aed);color:white;font-size:.9375rem;font-weight:500;border:none;cursor:pointer;letter-spacing:.01em;transition:all .15s ease}.cta-button:hover{opacity:.9;transform:translateY(-1px)}