:root{--bg:#f6f7fb;--card:#fff;--text:#0f172a;--muted:#64748b;--border:#e5e7eb;--shadow:0 12px 40px #0f172a14;--radius:16px;--primary:#111827;--primaryText:#fff;--inputBg:#fff;--focus:#11182726}*{box-sizing:border-box}html,body{color:var(--text);background:radial-gradient(1200px 600px at 20% 0%,#eef2ff 0%,transparent 60%),radial-gradient(1000px 500px at 100% 20%,#ecfeff 0%,transparent 55%),var(--bg);margin:0;padding:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}.container{max-width:980px;margin:0 auto;padding:24px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.cardHeader{border-bottom:1px solid var(--border);border-top-left-radius:var(--radius);border-top-right-radius:var(--radius);color:var(--muted);background:#fafafa;padding:14px 16px;font-size:13px}.cardBody{padding:16px}.h1{letter-spacing:-.02em;margin:0;font-size:30px;font-weight:850}.sub{color:var(--muted);margin:8px 0 0;line-height:1.5}.label{color:#334155;margin-bottom:6px;font-size:13px;font-weight:750;display:block}.input,.textarea{border:1px solid var(--border);background:var(--inputBg);border-radius:12px;outline:none;width:100%;padding:12px;font-size:14px}.textarea{resize:vertical;min-height:110px}.input:focus,.textarea:focus{box-shadow:0 0 0 4px var(--focus);border-color:#cbd5e1}.row{grid-template-columns:1fr 1fr;gap:12px;display:grid}@media (max-width:760px){.row{grid-template-columns:1fr}}.btn{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:12px;padding:11px 14px;font-weight:800}.btnPrimary{background:var(--primary);color:var(--primaryText);border-color:#00000014}.btn:disabled{opacity:.65;cursor:not-allowed}.pill{color:var(--muted);border:1px solid var(--border);background:#fff9;border-radius:999px;align-items:center;gap:8px;padding:6px 10px;font-size:12px;display:inline-flex}.nav{justify-content:space-between;align-items:center;gap:12px;margin:14px 0 16px;display:flex}.brand{align-items:center;gap:10px;display:flex}.logo{background:linear-gradient(135deg,#111827 0%,#334155 70%);border-radius:12px;width:38px;height:38px;box-shadow:0 10px 25px #1118272e}.brandTitle{letter-spacing:-.02em;font-weight:900}.brandSub{color:var(--muted);margin-top:2px;font-size:12px}.bubbleWrap{margin-bottom:10px;display:flex}.bubble{border:1px solid var(--border);white-space:pre-wrap;background:#fff;border-radius:14px;max-width:78%;padding:10px 12px;font-size:14px;line-height:1.45}.bubbleUser{color:#fff;background:#111827;border-color:#00000014;margin-left:auto}.muted{color:var(--muted)}.footerHint{color:var(--muted);margin-top:8px;font-size:12px}