: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)}.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}@media(max-width:768px){.chat-layout{grid-template-columns:1fr}.chat-sidebar{display:none}}