:root{--bg:#f7f8fa;--surface:#ffffff;--ink:#14213d;--muted:#5b6b86;--line:#e3e8ef;--brand:#1f6feb;--brand-dark:#1a5fd0;--accent:#0f9d7a;--warn-bg:#fff7ed;--warn-line:#fbc089;--warn-ink:#9a4b09;--radius:14px;--maxw:860px}*{box-sizing:border-box}body,html{padding:0;margin:0}body{background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}header.site{border-bottom:1px solid var(--line);background:var(--surface)}header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:62px}.logo{font-weight:800;letter-spacing:-.02em;font-size:18px}.logo span{color:var(--brand)}.badge-au{font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:3px 10px}.hero{padding:54px 0 22px}.hero h1{font-size:38px;line-height:1.12;letter-spacing:-.02em;margin:0 0 14px}.hero p.lead{font-size:19px;color:var(--muted);margin:0 0 22px;max-width:640px}.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}.chip{font-size:13px;background:#eef4ff;color:var(--brand-dark);border-radius:999px;padding:5px 12px}.disclaimer{background:var(--warn-bg);border:1px solid var(--warn-line);border-radius:10px;padding:12px 14px;font-size:13.5px;margin:18px 0}.disclaimer,.disclaimer strong{color:var(--warn-ink)}.guide{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 30px rgba(20,33,61,.06);overflow:hidden}.guide .head{padding:16px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}.guide .head .dot{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px rgba(15,157,122,.15)}.guide .head b{font-size:15px}.guide .head small{color:var(--muted);font-size:13px}.stream{padding:18px;display:flex;flex-direction:column;gap:14px;min-height:260px;max-height:60vh;overflow-y:auto}.msg{max-width:82%;padding:11px 14px;border-radius:12px;white-space:pre-wrap}.msg.ai{background:#f1f5fb;color:var(--ink);align-self:flex-start;border-bottom-left-radius:4px}.msg.me{background:var(--brand);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}.msg.err{background:#fdecec;color:#b42318}.msg.err,.typing{align-self:flex-start}.typing{color:var(--muted);font-size:14px}.starter{display:flex;flex-wrap:wrap;gap:8px;padding:0 18px 4px}.starter button{font:inherit;font-size:13.5px;cursor:pointer;background:#fff;border:1px solid var(--line);color:var(--ink);border-radius:999px;padding:7px 13px}.starter button:hover{border-color:var(--brand);color:var(--brand-dark)}.composer{display:flex;gap:8px;padding:14px 18px;border-top:1px solid var(--line)}.composer textarea{flex:1 1;resize:none;font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:10px;min-height:46px;max-height:140px}.composer button{font:inherit;font-weight:700;cursor:pointer;border:0;background:var(--brand);color:#fff;border-radius:10px;padding:0 18px}.composer button:disabled{opacity:.5;cursor:default}.section{padding:40px 0}.section h2{font-size:24px;letter-spacing:-.01em;margin:0 0 6px}.section p.sub{color:var(--muted);margin:0 0 22px}.steps{display:grid;grid-gap:12px;gap:12px}.step{display:flex;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px}.step .n{flex:none;width:30px;height:30px;border-radius:8px;background:#eef4ff;color:var(--brand-dark);font-weight:800;display:grid;place-items:center}.step b{display:block;margin-bottom:2px}.step small{color:var(--muted)}.cta{background:var(--ink);color:#fff;border-radius:var(--radius);padding:30px;text-align:center;margin:12px 0 46px}.cta h2{margin:0 0 8px;font-size:24px}.cta p{color:#c3cde0;margin:0 0 18px}.cta a.btn{display:inline-block;background:var(--brand);color:#fff;font-weight:700;padding:12px 22px;border-radius:10px}.cta a.btn:hover{background:var(--brand-dark);text-decoration:none}footer.site{border-top:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:13px}footer.site .wrap{padding:22px 20px}@media (max-width:640px){.hero h1{font-size:30px}.hero p.lead{font-size:17px}}