:root{color-scheme:light dark;--bg:#0b0d10;--panel:#15181d;--border:#262b33;--text:#e7eaee;--muted:#9aa3ad;--accent:#3da9fc;--bubble-user:#2563eb;--bubble-bot:#1f242b}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,sans-serif;background:var(--bg);color:var(--text);line-height:1.55}a{color:var(--accent)}.container{max-width:880px;margin:0 auto;padding:24px 20px 64px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border)}.brand{font-weight:600;font-size:16px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:18px 20px;margin:18px 0}.panel h2{margin:0 0 4px;font-size:15px}.muted{color:var(--muted);font-size:13px}.chat{display:flex;flex-direction:column;gap:10px;min-height:220px;max-height:420px;overflow-y:auto;padding:6px 2px}.bubble{max-width:78%;padding:10px 13px;border-radius:14px;white-space:pre-wrap;font-size:14px}.bubble.user{align-self:flex-end;background:var(--bubble-user);color:#fff;border-bottom-right-radius:4px}.bubble.bot{align-self:flex-start;background:var(--bubble-bot);border:1px solid var(--border);border-bottom-left-radius:4px}.composer{display:flex;gap:8px;margin-top:12px}button,input{font:inherit}.composer input{flex:1 1;background:#0e1116;border:1px solid var(--border);color:var(--text);border-radius:10px;padding:10px 12px}button{background:var(--accent);color:#04121f;border:none;border-radius:10px;padding:10px 16px;font-weight:600;cursor:pointer}button:disabled{opacity:.5;cursor:default}.providers{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.providers button{background:#1f242b;color:var(--text);border:1px solid var(--border);font-weight:500}.hero{text-align:center;padding:80px 20px}.hero h1{font-size:30px;margin-bottom:8px}