:root{--color-primary: #475569;--color-on-primary: #ffffff;--color-secondary: #64748b;--color-accent: #2563eb;--color-background: #f8fafc;--color-foreground: #1e293b;--color-muted: #eaeff3;--color-border: #e2e8f0;--color-destructive: #dc2626;--color-ring: #475569;--color-surface: #ffffff;--color-success: #15803d;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--radius: 16px;--nav-h: 64px;--font: Inter, ui-sans-serif, system-ui, -apple-system, sans-serif}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100dvh;background:var(--color-background);color:var(--color-foreground);font-family:var(--font);font-size:16px;line-height:1.5}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--color-ring);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.shell{min-height:100dvh;padding-bottom:calc(var(--nav-h) + env(safe-area-inset-bottom))}.page{padding:var(--space-5) var(--space-4) var(--space-6);max-width:720px;margin:0 auto}.page-header h1,.setup h1{margin:0;font-size:2rem;letter-spacing:-.04em;font-weight:700}.page-header.row{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4)}.page-header.row h1{flex:1;font-size:1.25rem}.eyebrow{margin:0 0 var(--space-1);color:var(--color-secondary);text-transform:uppercase;letter-spacing:.08em;font-size:.75rem;font-weight:600}.lede,.hint,.helper,.source-sub{color:var(--color-secondary)}.setup{min-height:100dvh;padding:72px var(--space-5);max-width:480px;margin:0 auto}.setup-card{margin:var(--space-5) 0;padding:var(--space-5);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);display:flex;gap:var(--space-3);align-items:center}.spinner{width:22px;height:22px;border:2px solid var(--color-border);border-top-color:var(--color-accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion: reduce){.spinner{animation:none}*{transition:none!important;scroll-behavior:auto!important}}.empty{margin-top:var(--space-6);padding:var(--space-5);background:var(--color-surface);border:1px dashed var(--color-border);border-radius:var(--radius)}.btn{min-height:48px;padding:0 var(--space-4);border-radius:12px;border:1px solid transparent;display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);transition:background .18s ease,transform .15s ease}.btn.primary{background:var(--color-accent);color:var(--color-on-primary)}.btn.primary:hover{filter:brightness(.95)}.btn.primary:disabled{opacity:.45;cursor:not-allowed}.btn.ghost{background:transparent;color:var(--color-foreground);width:100%}.btn.compact{min-height:44px;padding:0 var(--space-3)}.btn:active{transform:scale(.98)}.icon-btn{width:44px;height:44px;border:0;background:var(--color-muted);border-radius:12px;display:inline-flex;align-items:center;justify-content:center;color:var(--color-foreground)}.icon-btn.send{background:var(--color-accent);color:var(--color-on-primary)}.icon-btn.send:disabled{opacity:.45;cursor:not-allowed}.source-list{list-style:none;padding:0;margin:var(--space-4) 0 96px;display:flex;flex-direction:column;gap:var(--space-3)}.source-list li{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden}.source-row{width:100%;display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4);border:0;background:transparent;text-align:left;min-height:72px}.source-icon{width:44px;height:44px;border-radius:12px;background:var(--color-muted);display:flex;align-items:center;justify-content:center;color:var(--color-primary);flex-shrink:0}.source-meta{flex:1;min-width:0;display:flex;flex-direction:column}.source-title{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.source-sub{font-size:.875rem}.status-dot{color:var(--color-secondary)}.status-dot.ready{color:var(--color-success)}.status-dot.failed{color:var(--color-destructive)}.retry-btn{display:inline-flex;align-items:center;gap:var(--space-2);min-height:44px;margin:0 var(--space-4) var(--space-3);border:0;background:transparent;color:var(--color-accent)}.fab{position:fixed;right:var(--space-4);bottom:calc(var(--nav-h) + env(safe-area-inset-bottom) + var(--space-4));width:56px;height:56px;border-radius:16px;border:0;background:var(--color-accent);color:var(--color-on-primary);display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px #2563eb47}.bottom-nav{position:fixed;left:0;right:0;bottom:0;height:calc(var(--nav-h) + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--color-surface);border-top:1px solid var(--color-border);display:grid;grid-template-columns:1fr 1fr;z-index:20}.nav-btn{border:0;background:transparent;color:var(--color-secondary);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:.75rem;font-weight:600}.nav-btn.active{color:var(--color-accent)}.sheet-scrim{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;z-index:40;display:flex;align-items:flex-end;justify-content:center}.sheet{width:100%;max-width:560px;background:var(--color-surface);border-radius:24px 24px 0 0;padding:var(--space-5) var(--space-4) calc(var(--space-5) + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:var(--space-3)}.sheet-title{margin:0;font-weight:700;font-size:1.125rem}.sheet-item{min-height:48px;border:1px solid var(--color-border);border-radius:12px;background:var(--color-background);display:flex;align-items:center;gap:var(--space-3);padding:0 var(--space-4);text-align:left}label{font-weight:600;font-size:.875rem}input,textarea{width:100%;border:1px solid var(--color-border);border-radius:12px;padding:12px 14px;background:var(--color-surface);color:var(--color-foreground);min-height:48px}textarea{min-height:50dvh;resize:vertical;line-height:1.6}.field-error{color:var(--color-destructive);margin:0;font-size:.875rem}.banner.error{background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius);padding:var(--space-4);display:flex;flex-direction:column;gap:var(--space-3)}.chat{display:flex;flex-direction:column;min-height:calc(100dvh - var(--nav-h) - env(safe-area-inset-bottom));padding-bottom:0}.thread{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:var(--space-3);padding-bottom:88px}.bubble{max-width:92%;padding:var(--space-3) var(--space-4);border-radius:16px;white-space:pre-wrap;word-break:break-word}.bubble p{margin:0}.bubble.user{align-self:flex-end;background:var(--color-accent);color:var(--color-on-primary)}.bubble.assistant{align-self:flex-start;background:var(--color-surface);border:1px solid var(--color-border)}.bubble.typing{color:var(--color-secondary)}.low-conf{font-size:.75rem;font-weight:600;color:var(--color-secondary);margin-bottom:var(--space-2)!important;text-transform:uppercase;letter-spacing:.04em}.chips{display:flex;flex-wrap:wrap;gap:var(--space-2);margin-top:var(--space-3)}.chip{min-height:36px;padding:0 12px;border-radius:999px;border:1px solid var(--color-border);background:var(--color-muted);color:var(--color-foreground);font-size:.8125rem;font-weight:600}.composer{position:sticky;bottom:0;display:flex;gap:var(--space-2);padding:var(--space-3) 0 calc(var(--space-3));background:linear-gradient(to top,var(--color-background) 70%,transparent)}.editor input{margin-bottom:var(--space-4)}