:root{--bg-base: #f8f9fa;--bg-card: #ffffff;--text-primary: #1c2a33;--text-muted: #5c6b76;--brand: #00684a;--brand-light: #13aa52;--border: #e2e8f0}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg-base);color:var(--text-primary)}a{color:var(--brand)}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1.25rem;background:var(--text-primary);color:#fff}.topbar h1{margin:0;font-size:1.1rem;font-weight:700}.btn{border:none;border-radius:8px;padding:.5rem 1rem;font-weight:600;cursor:pointer;background:var(--brand);color:#fff}.btn-secondary{background:transparent;border:1px solid var(--border);color:var(--text-primary)}.btn:disabled{opacity:.6;cursor:not-allowed}.auth-card{max-width:400px;margin:4rem auto;padding:2rem;background:var(--bg-card);border-radius:12px;border:1px solid var(--border);box-shadow:0 4px 24px #0000000f}.auth-card input{width:100%;margin-bottom:.75rem;padding:.6rem .75rem;border:1px solid var(--border);border-radius:8px}.chat-layout{flex:1;display:grid;grid-template-columns:280px 1fr;min-height:calc(100vh - 52px)}.chat-sidebar{border-right:1px solid var(--border);padding:1rem;background:var(--bg-card);overflow-y:auto}.new-chat-btn{width:100%;margin-bottom:1rem}.sidebar-meta{font-size:.85rem;color:var(--text-muted);margin:0 0 .5rem}.synthesis-badge{font-size:.8rem;color:var(--brand);font-weight:600}.sidebar-hint{font-weight:400;color:var(--text-muted);font-size:.75rem}.sidebar-label{font-size:.85rem;display:block;margin-top:.75rem}.sidebar-input{width:100%;margin-top:4px;padding:6px;border:1px solid var(--border);border-radius:6px;font:inherit}.sidebar-checkbox{display:flex;align-items:center;gap:.5rem;margin-top:.75rem}.sidebar-checkbox input{margin:0}.sidebar-section-title{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted);margin:1.25rem 0 .5rem}.session-list{list-style:none;margin:0;padding:0}.session-item{width:100%;text-align:left;border:1px solid transparent;background:var(--bg-base);border-radius:8px;padding:.5rem .65rem;margin-bottom:.35rem;cursor:pointer;font:inherit}.session-item:hover{border-color:var(--border)}.session-item.active{border-color:var(--brand);background:#00684a14}.session-title{display:block;font-size:.85rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.session-meta{display:block;font-size:.75rem;color:var(--text-muted);margin-top:2px}.chat-main{display:flex;flex-direction:column;min-height:0}.messages{flex:1;overflow-y:auto;padding:1.25rem;display:flex;flex-direction:column;gap:1rem}.msg{max-width:85%;padding:.85rem 1rem;border-radius:12px;line-height:1.5;white-space:pre-wrap}.msg-user{align-self:flex-end;background:var(--brand);color:#fff}.msg-assistant{align-self:flex-start;background:var(--bg-card);border:1px solid var(--border)}.composer{display:flex;gap:.5rem;padding:1rem;border-top:1px solid var(--border);background:var(--bg-card)}.composer textarea{flex:1;min-height:48px;max-height:160px;resize:vertical;padding:.65rem .75rem;border:1px solid var(--border);border-radius:8px;font:inherit}.chip-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:.75rem}.chip{border:1px solid var(--border);background:var(--bg-base);border-radius:999px;padding:.35rem .75rem;font-size:.85rem;cursor:pointer}.chip:hover{border-color:var(--brand);color:var(--brand)}.embed-shell{min-height:100vh;display:flex;flex-direction:column}.sidebar-toggle{display:none;background:transparent;border:1px solid rgba(255,255,255,.3);color:#fff;border-radius:6px;padding:.25rem .5rem;cursor:pointer;font-size:1rem}.msg-heading{margin:.5rem 0 .25rem;font-size:1rem}.msg-bullet{padding-left:8px}.msg-muted{font-size:.85rem;color:var(--text-muted);font-style:italic}.msg-meta{margin-top:8px;font-size:.75rem;color:var(--text-muted)}.msg-sources{margin-top:8px;font-size:.85rem;color:var(--text-muted)}@media(max-width:768px){.sidebar-toggle{display:inline-block}.chat-layout{grid-template-columns:1fr}.chat-sidebar{display:none;position:fixed;top:52px;left:0;bottom:0;width:min(300px,85vw);z-index:100;box-shadow:4px 0 24px #0000001f}.chat-sidebar.open{display:block}}