chat.css

:root{--bg:#fff;--text:#111;--muted:#666;--line:#e5e5e5;--soft:#f6f6f6}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 Inter,Arial,sans-serif}
.shell{max-width:820px;margin:auto;padding:28px 20px 60px}
.top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:20px}
.brand{font-size:25px;font-weight:700;letter-spacing:2px;color:inherit;text-decoration:none}
.badge{font-size:11px;letter-spacing:1px;color:var(--muted)}
.panel{margin-top:42px}
.hidden{display:none}
h1{font-size:42px;line-height:1.1;margin:0 0 18px}
h2{font-size:28px;line-height:1.2;margin:0 0 12px}
.muted{color:var(--muted);max-width:680px}
button{font:inherit;cursor:pointer;border-radius:7px;padding:12px 18px}
.primary{background:#111;color:#fff;border:1px solid #111}
.secondary{background:#fff;color:#111;border:1px solid #bbb}
.actions{display:flex;gap:10px;margin-top:12px}
textarea{font:inherit;width:100%;resize:vertical;border:1px solid #ccc;border-radius:7px;padding:12px}
#inviteLink{min-height:92px;margin-top:15px}
.status{min-height:1.5em;color:var(--muted)}
.chatHead{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;border-bottom:1px solid var(--line);padding-bottom:16px}
.messages{height:52vh;min-height:320px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:16px;margin:18px 0;background:var(--soft)}
.message{max-width:80%;padding:10px 13px;border-radius:12px;margin:8px 0;white-space:pre-wrap;overflow-wrap:anywhere}
.message.mine{margin-left:auto;background:#111;color:#fff}
.message.theirs{background:#fff;border:1px solid var(--line)}
.message small{display:block;opacity:.55;font-size:10px;margin-top:3px}
.composer{display:grid;grid-template-columns:1fr auto;gap:10px}
#messageInput{min-height:48px}
@media(max-width:600px){h1{font-size:34px}.composer{grid-template-columns:1fr}.message{max-width:92%}}