:root{--brand-green: #007a3e;--brand-green-dark: #005c2e;--brand-green-light: #009a4e;--brand-blue: #0076a8;--brand-blue-dark: #005d83;--brand-blue-light: #3494c6;--bg: #f4f7f8;--panel: #ffffff;--border: #dde4e8;--accent: var(--brand-green);--accent-hover: var(--brand-green-dark);--user-bubble: var(--brand-blue);--assistant-bubble: #eef3f5;--text: #332e3c;--muted: #647179;--error-bg: #fdecea;--error-text: #a31515}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Muli,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}.signin{height:100%;display:grid;place-items:center}.signin-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:2.5rem;max-width:380px;text-align:center;box-shadow:0 4px 20px #0000000f}.signin-logo{width:180px;height:auto;margin-bottom:1.25rem}.signin-card h1{margin:0 0 .5rem;font-size:1.4rem;font-weight:700;color:var(--brand-blue)}.signin-card p{color:var(--muted);font-size:.95rem;margin-bottom:1.5rem}.app-shell{height:100%;display:flex;flex-direction:column}.app-header{display:flex;align-items:center;justify-content:space-between;padding:.6rem 1.25rem;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:inset 0 -3px 0 0 var(--brand-green)}.brand{display:flex;align-items:center;gap:.75rem}.brand-logo{height:30px;width:auto;display:block}.brand-divider{width:1px;height:24px;background:var(--border)}.brand-app{font-weight:600;color:var(--brand-blue)}.header-right{display:flex;align-items:center;gap:1rem}.user{color:var(--muted);font-size:.9rem}.chat{flex:1;display:flex;flex-direction:column;max-width:820px;width:100%;margin:0 auto;min-height:0}.messages{flex:1;overflow-y:auto;padding:1.5rem 1rem;display:flex;flex-direction:column;gap:1rem}.empty{margin:auto;color:var(--muted)}.bubble{max-width:80%;padding:.75rem 1rem;border-radius:12px;white-space:pre-wrap;word-wrap:break-word;line-height:1.5}.bubble.user{align-self:flex-end;background:var(--user-bubble);color:#fff}.bubble.assistant{align-self:flex-start;background:var(--assistant-bubble)}.role-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.04em;opacity:.7;margin-bottom:.25rem}.typing{letter-spacing:.15em}.error-bar{background:var(--error-bg);color:var(--error-text);padding:.6rem 1rem;font-size:.85rem;border-top:1px solid var(--border)}.composer{display:flex;gap:.75rem;padding:1rem;border-top:1px solid var(--border);background:var(--panel)}.composer textarea{flex:1;resize:none;padding:.6rem .75rem;border:1px solid var(--border);border-radius:8px;font:inherit;font-size:.95rem}.composer textarea:focus{outline:2px solid var(--accent);border-color:var(--accent)}.primary-btn{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:.6rem 1.25rem;font:inherit;font-weight:500;cursor:pointer}.primary-btn:hover:not(:disabled){background:var(--accent-hover)}.primary-btn:disabled{opacity:.5;cursor:not-allowed}.ghost-btn{background:transparent;border:1px solid var(--border);border-radius:8px;padding:.4rem .9rem;font:inherit;font-size:.85rem;cursor:pointer;color:var(--text)}.ghost-btn:hover{background:var(--bg)}