:root{--bg:#0f172a;--panel:#fff;--muted:#64748b;--border:#e2e8f0;--accent:#2563eb;--accent-soft:#eff6ff;--visitor:#f1f5f9;--operator:#2563eb}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:#f8fafc;color:#0f172a}a{color:var(--accent)}button{font-family:inherit;cursor:pointer}.chat-shell{max-width:760px;margin:0 auto;height:100dvh;flex-direction:column;border-left:1px solid var(--border);border-right:1px solid var(--border)}.chat-header,.chat-shell{display:flex;background:var(--panel)}.chat-header{padding:14px 18px;border-bottom:1px solid var(--border);align-items:center;gap:10px}.chat-header h1{font-size:16px;margin:0}.status-dot{width:9px;height:9px;border-radius:50%;background:#cbd5e1}.status-dot.online{background:#22c55e}.messages{flex:1 1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:10px;background:#f8fafc}.bubble{max-width:75%;padding:9px 13px;border-radius:14px;line-height:1.4;font-size:15px;word-wrap:break-word;white-space:pre-wrap}.bubble .time{display:block;font-size:11px;opacity:.6;margin-top:3px}.row{display:flex}.row.mine{justify-content:flex-end}.row.mine .bubble{background:var(--operator);color:#fff;border-bottom-right-radius:4px}.row.theirs .bubble{background:var(--visitor);color:#0f172a;border-bottom-left-radius:4px}.composer{display:flex;gap:8px;padding:12px;border-top:1px solid var(--border);background:var(--panel)}.composer textarea{flex:1 1;resize:none;border:1px solid var(--border);border-radius:10px;padding:10px 12px;font-size:15px;font-family:inherit;max-height:120px}.composer textarea:focus{outline:none;border-color:var(--accent)}.composer button{border:none;background:var(--accent);color:#fff;border-radius:10px;padding:0 18px;font-size:15px;font-weight:600}.composer button:disabled{opacity:.5;cursor:default}.empty{margin:auto;color:var(--muted);text-align:center;font-size:14px}.admin{display:grid;grid-template-columns:320px 1fr;height:100dvh}.sidebar{border-right:1px solid var(--border);display:flex;flex-direction:column;background:var(--panel);min-height:0}.sidebar-head{padding:14px 16px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.sidebar-head strong{font-size:15px}.conv-list{overflow-y:auto;flex:1 1}.conv-item{padding:12px 16px;border-bottom:1px solid var(--border);cursor:pointer;display:flex;flex-direction:column;gap:3px}.conv-item:hover{background:#f8fafc}.conv-item.active{background:var(--accent-soft)}.conv-item .title{font-weight:600;font-size:14px}.conv-item .preview{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-item .meta{font-size:11px;color:#94a3b8}.panel-main{display:flex;flex-direction:column;min-width:0}.btn{border:1px solid var(--border);background:var(--panel);border-radius:8px;padding:7px 12px;font-size:13px;font-weight:600}.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.toolbar{padding:12px 18px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px;background:var(--panel)}.toolbar .link-box{flex:1 1;font-size:13px;color:var(--muted);background:#f8fafc;border:1px solid var(--border);border-radius:8px;padding:6px 10px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.center-card{min-height:100dvh;display:grid;place-items:center;padding:20px}.card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:28px;width:100%;max-width:380px;box-shadow:0 10px 30px rgba(15,23,42,.06)}.card h1{margin:0 0 6px;font-size:20px}.card p.sub{margin:0 0 20px;color:var(--muted);font-size:14px}.field{margin-bottom:14px}.field label{display:block;font-size:13px;margin-bottom:6px;color:var(--muted)}.field input{width:100%;border:1px solid var(--border);border-radius:9px;padding:10px 12px;font-size:15px}.field input:focus{outline:none;border-color:var(--accent)}.error{color:#dc2626;font-size:13px;margin-bottom:12px}.full{width:100%;border:none;background:var(--accent);color:#fff;padding:11px;border-radius:9px;font-size:15px;font-weight:600}.mobile-back{display:none;padding:7px 12px;font-size:16px;line-height:1}.modal-overlay{position:fixed;inset:0;background:rgba(15,23,42,.45);display:grid;place-items:center;padding:20px;z-index:50}@media (max-width:720px){.chat-shell{max-width:100%;border-left:none;border-right:none}.bubble{max-width:85%}.bubble,.composer textarea{font-size:16px}.admin{grid-template-columns:1fr;grid-template-rows:100dvh}.panel-main,.sidebar{height:100dvh}.admin.has-active .sidebar,.panel-main{display:none}.admin.has-active .panel-main{display:flex}.mobile-back{display:inline-flex;align-items:center}.sidebar-head .btn-primary{font-size:12px;padding:7px 10px}}