*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:#eef3f7;color:#17212b}button,input{font:inherit}.app{height:100vh;display:grid;grid-template-columns:330px 1fr}.sidebar{background:#fff;border-right:1px solid #dce3e9;padding:14px;overflow:auto}.top{display:flex;justify-content:space-between;align-items:center;font-size:20px}.top a{font-size:13px;color:#d33;text-decoration:none}.profile{padding:14px 4px;color:#222}.profile small,.person small,.chatitem small{display:block;color:#788691;font-size:12px;margin-top:3px}.search{width:100%;padding:11px;border:1px solid #d6dee5;border-radius:10px;margin:5px 0 12px}h4{color:#75828d;margin:12px 4px 6px}.person,.chatitem{width:100%;text-align:left;border:0;background:transparent;border-radius:10px;padding:11px;cursor:pointer}.person:hover,.chatitem:hover{background:#edf6fb}.main{display:flex;flex-direction:column;min-width:0}header{background:#fff;padding:17px;border-bottom:1px solid #dce3e9;font-weight:700}.messages{flex:1;overflow:auto;padding:20px}.bubble{max-width:70%;background:#fff;padding:9px 12px;margin:7px 0;border-radius:12px;box-shadow:0 1px 2px #0001}.bubble.mine{margin-left:auto;background:#dff7d9}.bubble strong{font-size:12px}.bubble small{display:block;color:#7b8790;font-size:10px;margin-top:4px}.composer{background:#fff;border-top:1px solid #dce3e9;padding:12px;display:flex;gap:10px}.composer input{flex:1;border:1px solid #d6dee5;border-radius:22px;padding:12px 15px}.composer button,.card button{border:0;border-radius:10px;background:#239fd0;color:white;font-weight:700;padding:11px 18px}.composer button{border-radius:22px}.welcome{text-align:center;margin-top:25vh;color:#697782}.auth{min-height:100vh;display:grid;place-items:center;padding:20px}.card{background:#fff;width:min(430px,100%);padding:28px;border-radius:18px;display:grid;gap:12px;box-shadow:0 12px 40px #0001}.card h1{margin:0}.card p{color:#687781}.card input{padding:13px;border:1px solid #d2dbe2;border-radius:10px}.card a{text-align:center;color:#1689b8;text-decoration:none}.error{background:#ffe7e5;color:#9b1c16;padding:10px;border-radius:8px}.success{background:#e4f8e9;padding:12px;border-radius:8px}@media(max-width:700px){.app{grid-template-columns:105px 1fr}.sidebar{padding:7px}.top b{font-size:14px}.profile,.person,.chatitem{font-size:11px}.search{font-size:11px}.bubble{max-width:86%}}