:root{--green:#214f40;--ink:#20382e;--muted:#65776e;--line:#dce6df;--yellow:#f3cf48}*{box-sizing:border-box}body{margin:0;background:#f4f7f3;color:var(--ink);font:17px/1.65 system-ui,"Microsoft JhengHei",sans-serif}header{background:white;border-bottom:1px solid var(--line);padding:20px 4%;display:flex;align-items:center;justify-content:space-between;gap:20px}a{color:var(--green)}.brand{font-size:24px;font-weight:800;text-decoration:none}.brand small{display:block;font-size:11px;letter-spacing:3px}nav{display:flex;gap:24px;flex-wrap:wrap}nav a{text-decoration:none;padding:8px 0}nav [aria-current]{border-bottom:3px solid var(--yellow);font-weight:800}main{max-width:1440px;margin:30px auto;padding:0 28px}.heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}h1{font-size:36px;margin:4px 0}h2{font-size:21px;margin:0 0 12px}.heading p{margin:0;color:var(--muted)}.eyebrow{font-size:12px;letter-spacing:3px;font-weight:700}.privacy{padding:8px 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var(--line);border-radius:10px;padding:11px 13px;background:#f8faf7;font-weight:700;cursor:pointer}.recipient-choice:has(input:checked){background:#edf5ee;border-color:var(--green);box-shadow:inset 4px 0 var(--green)}.recipient-choice input{width:20px;height:20px;min-height:0;margin:0;flex:0 0 auto;accent-color:var(--green)}.recipient-empty{grid-column:1/-1;color:var(--muted);background:#f6f8f5;border-radius:10px;padding:14px}#assignInfo{white-space:pre-line}*:focus-visible{outline:3px solid #d4ab24;outline-offset:3px}[hidden]{display:none!important}@media(max-width:760px){body{font-size:18px}header{padding:14px 18px;display:block}nav{gap:18px;font-size:16px;margin-top:12px}main{padding:0 14px;margin-top:22px}.heading{display:block}.privacy{display:inline-block;margin-top:12px}h1{font-size:30px}.workspace{grid-template-columns:1fr;gap:0}.panel{padding:16px;border-radius:14px}.conversations{max-height:300px}.toolbar{gap:10px}.toolbar label{min-width:42%}.toolbar button{width:100%}.chathead{flex-wrap:wrap}#messages{height:48vh;min-height:280px}.message{margin-right:5%}.message.mine{margin-left:5%}.composebar{align-items:stretch;flex-direction:column}.filelabel{max-width:100%}.newrow{display:block}.newrow>*{margin-bottom:12px}.newrow button{width:100%}#empty{padding:30px 6px}input,select,textarea{font-size:18px}#chatTitle{font-size:20px}}