:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color-scheme:light dark;--bg:#0f1115;--card:#171a21;--line:#2a2f39;--text:#f5f7fb;--muted:#9aa4b2;--accent:#4f8cff;--mine:#244b8f;--theirs:#222731;--danger:#ff6b6b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,input,textarea{font:inherit}.shell{max-width:920px;margin:0 auto;padding:24px 14px}.card,.chat{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden}.card{max-width:520px;margin:8vh auto;padding:24px}.hidden{display:none!important}h1{font-size:22px;margin:0 0 10px}.muted{color:var(--muted)}.small{font-size:12px}.error{color:var(--danger);min-height:22px;margin-top:8px}label{display:block;margin:14px 0 6px}input,textarea{width:100%;border:1px solid var(--line);background:#11141a;color:var(--text);border-radius:10px;padding:11px 12px;outline:none}input:focus,textarea:focus{border-color:var(--accent)}button,.file-button{border:0;border-radius:10px;padding:10px 14px;background:var(--accent);color:#fff;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.ghost{background:transparent;border:1px solid var(--line)}button:disabled{opacity:.55;cursor:default}.chat{height:min(820px,calc(100dvh - 28px));display:flex;flex-direction:column}.chat-head{padding:16px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}.messages{flex:1;overflow:auto;padding:18px;display:flex;flex-direction:column;gap:10px}.msg{max-width:min(76%,680px);padding:10px 12px;border-radius:14px;background:var(--theirs);word-break:break-word}.msg.mine{align-self:flex-end;background:var(--mine)}.msg.theirs{align-self:flex-start}.msg time{display:block;margin-top:6px;font-size:10px;color:var(--muted)}.attachment{display:block;margin-top:8px;color:#d8e6ff;text-decoration:none;border-top:1px solid rgba(255,255,255,.12);padding-top:7px}.attachment small{color:var(--muted)}.composer{padding:12px;border-top:1px solid var(--line)}.composer textarea{resize:vertical;min-height:58px;max-height:180px}.composer-row{display:flex;gap:10px;align-items:center;margin-top:8px}.composer-row button{margin-left:auto}.file-button{background:#303744;margin:0}.admin-layout{display:grid;grid-template-columns:320px 1fr;gap:14px}.chat-list{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:auto;max-height:calc(100dvh - 90px)}.chat-item{display:block;padding:13px 14px;border-bottom:1px solid var(--line);color:var(--text);text-decoration:none}.chat-item:hover,.chat-item.active{background:#202631}.chat-item .meta{font-size:12px;color:var(--muted);margin-top:5px}.admin-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.badge{display:inline-flex;padding:2px 7px;border-radius:999px;background:#303744;color:var(--muted);font-size:11px}.empty{padding:30px;color:var(--muted);text-align:center}@media(max-width:760px){.shell{padding:8px}.chat{height:calc(100dvh - 16px);border-radius:12px}.admin-layout{display:block}.chat-list{max-height:none}.msg{max-width:88%}}