:root{color:#111827;background:#f3f4f6;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-height:100vh;padding:env(safe-area-inset-top) 16px env(safe-area-inset-bottom);margin:0}.shell{flex-direction:column;max-width:680px;min-height:100vh;margin:0 auto;padding:28px 0 20px;display:flex}h1{margin:0;font-size:2rem}header p{color:#6b7280;margin:6px 0 18px}.status{color:#15803d;min-height:22px;margin-bottom:10px;font-size:.9rem}.status.error{color:#b91c1c}.messages{flex:1;margin:0 0 16px;padding:0;list-style:none}.messages li{background:#fff;border-radius:14px;margin-bottom:10px;padding:12px 14px;box-shadow:0 1px 3px #00000012}.messages small{color:#9ca3af;margin-top:5px;font-size:.75rem;display:block}.composer{background:#f3f4f6;gap:8px;padding-top:8px;display:flex;position:sticky;bottom:0}input{border:1px solid #d1d5db;border-radius:12px;flex:1;min-width:0;padding:13px;font-size:1rem}button{color:#fff;background:#111827;border:0;border-radius:12px;padding:0 18px;font-weight:600}