:root{font:16px system-ui,sans-serif;color:#152f36;background:#eef4f5;--accent:#124e62}
*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0}
.top{display:flex;align-items:center;gap:10px;padding:14px max(16px,calc((100vw - 980px)/2));background:var(--accent);color:white}
.top img{border-radius:10px}.top div{margin-right:auto}.top small{display:block;color:#d1e8ee;font-size:.72rem}
main{max-width:980px;padding:16px;margin:auto}
button,input,textarea{font:inherit}button{cursor:pointer;border:0;background:var(--accent);color:white;border-radius:9px;padding:10px 14px}
button:disabled{opacity:.55;cursor:default}.top button{background:#eaf8fa;color:var(--accent);padding:8px 10px}
.card{max-width:440px;margin:7vh auto;background:white;border:1px solid #d1e0e4;border-radius:18px;padding:24px}
h1,h2,p{margin:0 0 12px}h1{font-size:1.45rem}h2{font-size:1.1rem}
label{display:block;font-weight:650;font-size:.9rem;margin-bottom:8px}input,textarea{display:block;width:100%;border:1px solid #90a9b3;border-radius:8px;padding:9px;margin-top:4px}textarea{resize:vertical}
#loginError,#chatError{color:#922925;font-size:.85rem;margin-top:8px}
.chat{display:grid;grid-template-columns:200px 1fr;min-height:70vh;background:white;border:1px solid #d1e0e4;border-radius:18px;overflow:hidden}
.rooms{padding:14px;background:#f4f9fa}.rooms button{width:100%;text-align:left;margin-bottom:5px;background:transparent;color:#194b5b}.rooms button[aria-current=true]{background:#d6ebf0}
.room{min-width:0;padding:14px;display:flex;flex-direction:column}.room-head{display:flex;align-items:center;justify-content:space-between;gap:8px}
#older{font-size:.75rem;padding:6px}.room-head h2{margin:0}
ol{margin:10px 0;padding:8px;min-height:200px;height:56vh;overflow:auto;list-style:none;background:#edf4f5;border-radius:12px}
li{margin:6px 24px 8px 0;padding:8px 10px;background:white;border-radius:10px;overflow-wrap:anywhere}li.mine{margin:6px 0 8px 24px;background:#d5eee7}
li time{font-size:.72rem;color:#45606a;margin-left:8px}li p{margin:4px 0 0;white-space:pre-wrap}
#compose div{display:flex;align-items:center;gap:8px}#compose textarea{margin:0}#installHint{font-size:.85rem;color:#365963}
@media(max-width:610px){main{padding:8px}.chat{grid-template-columns:1fr}.rooms nav{display:flex;gap:4px;overflow:auto}.rooms button{width:auto;flex:none}.rooms h1{font-size:1.05rem;margin-bottom:4px}ol{height:48dvh}}