:root{color-scheme:dark;font-family:Inter,system-ui,sans-serif;line-height:1.5;font-weight:400;color:#e2e8f0;background:#0f172a}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top,#1e293b,#0f172a 55%)}a{color:#93c5fd}button,input,select,textarea{font:inherit}.app-shell{max-width:1100px;margin:0 auto;padding:1.5rem}.card{background:#1e293beb;border:1px solid #334155;border-radius:16px;padding:1.25rem;box-shadow:0 20px 40px #00000040}.stack{display:flex;flex-direction:column;gap:1rem}.row{display:flex;gap:.75rem;flex-wrap:wrap;align-items:center}.btn{border:none;border-radius:10px;padding:.65rem 1rem;cursor:pointer;background:#2563eb;color:#fff}.btn.secondary{background:#334155}.btn:disabled{opacity:.55;cursor:not-allowed}.field{display:flex;flex-direction:column;gap:.35rem}.field input,.field select,.field textarea{width:100%;border-radius:10px;border:1px solid #475569;background:#0f172a;color:#e2e8f0;padding:.65rem .75rem}.error{color:#fca5a5;font-size:.92rem}.muted{color:#94a3b8;font-size:.92rem}.chat-log{min-height:320px;max-height:55vh;overflow:auto;display:flex;flex-direction:column;gap:.75rem;padding:.5rem;background:#0f172aa6;border-radius:12px;border:1px solid #334155}.bubble{max-width:85%;padding:.75rem .9rem;border-radius:12px;white-space:pre-wrap}.bubble.user{align-self:flex-end;background:#1d4ed8}.bubble.assistant{align-self:flex-start;background:#334155}.topbar{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1rem}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:1rem}.login-wrap .card{width:min(420px,100%)}