:root{--yookr-orange:#f58220;--yookr-orange-dark:#d96812;--yookr-ink:#2d2926;--yookr-muted:#81766e;--yookr-cream:#fff8f1;--yookr-border:#f0dfcf;color:var(--yookr-ink);background:var(--yookr-cream);font-family:Inter,system-ui,sans-serif}*{box-sizing:border-box}body{margin:0}.shell{place-items:center;min-height:100vh;padding:24px;display:grid}.card{border:1px solid var(--yookr-border);background:#fff;border-radius:24px;flex-direction:column;width:min(720px,100%);height:min(760px,90vh);display:flex;overflow:hidden;box-shadow:0 20px 60px #8c4b1a18}header{border-bottom:1px solid #f3e8de;align-items:center;gap:14px;padding:22px 26px;display:flex}.leaf{background:#fff0e2;border-radius:14px;place-items:center;width:44px;height:44px;font-size:23px;display:grid}h1,h2,p{margin:0}h1{font-size:21px}header p{color:var(--yookr-muted);margin-top:3px;font-size:13px}.messages{flex-direction:column;flex:1;gap:14px;padding:26px;display:flex;overflow-y:auto}.welcome{text-align:center;color:var(--yookr-muted);margin:auto}.welcome h2{color:var(--yookr-orange-dark);margin-bottom:8px}.message{white-space:pre-wrap;border-radius:16px;max-width:80%;padding:12px 15px;line-height:1.5}.user{color:#fff;background:var(--yookr-orange);border-bottom-right-radius:5px;align-self:flex-end}.assistant{background:#fff1e5;border-bottom-left-radius:5px;align-self:flex-start}.thinking{color:var(--yookr-muted);align-self:flex-start;font-size:14px;font-style:italic}form{border-top:1px solid #f3e8de;gap:10px;padding:18px;display:flex}input{font:inherit;border:1px solid #e5cdb9;border-radius:12px;outline:none;flex:1;padding:13px 14px}input:focus{border-color:var(--yookr-orange)}button{color:#fff;background:var(--yookr-orange);cursor:pointer;border:0;border-radius:12px;padding:0 20px;font-weight:600}button:hover:not(:disabled){background:var(--yookr-orange-dark)}button:disabled{opacity:.5;cursor:default}