:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--background:#f6f7f9;--foreground:#171717;--muted:#6b7280;--border:#d7dce3;--panel:#fff;--assistant:#fff;--user:#1f6feb}*{box-sizing:border-box}html,body{height:100%;margin:0}body{background:var(--background);color:var(--foreground);font-family:Arial,Helvetica,sans-serif}button,textarea{font:inherit}a{color:#1f6feb}.app-shell{background:var(--panel);border-left:1px solid var(--border);border-right:1px solid var(--border);grid-template-rows:auto 1fr auto;max-width:860px;height:100vh;margin:0 auto;display:grid}.app-header{border-bottom:1px solid var(--border);text-align:center;padding:18px 20px}.app-header h1{margin:0;font-size:18px;line-height:1.3}.conversation{padding:24px 18px;overflow-y:auto}.message-row{margin-bottom:16px;display:flex}.message-row.user{justify-content:flex-end}.message{border:1px solid var(--border);overflow-wrap:anywhere;border-radius:8px;max-width:min(680px,88%);padding:12px 14px;line-height:1.55}.message.user{color:#fff;background:var(--user);border-color:var(--user)}.message.assistant{background:var(--assistant)}.message p:first-child,.message h1:first-child,.message h2:first-child{margin-top:0}.message p:last-child{margin-bottom:0}.status{color:var(--muted);margin:4px 0 16px;font-size:14px}.composer{border-top:1px solid var(--border);background:#fbfcfd;grid-template-columns:1fr auto;gap:10px;padding:14px;display:grid}.composer textarea{resize:vertical;border:1px solid var(--border);border-radius:8px;outline:none;min-height:44px;max-height:140px;padding:11px 12px}.composer textarea:focus{border-color:#1f6feb}.composer button{color:#fff;cursor:pointer;background:#171717;border:0;border-radius:8px;min-width:86px;height:44px}.composer button:disabled{cursor:not-allowed;opacity:.55}