:root{
  --bg:#f3f4f6; --panel:#ffffff; --ink:#111827; --muted:#6b7280; --line:#e5e7eb;
  --brand:#2563eb; --brand-d:#1d4ed8; --own:#dbeafe; --err:#dc2626; --ok:#16a34a;
  --header:#1f2937;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font:15px/1.4 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink)}
.hidden{display:none!important}
code{background:#f3f4f6;padding:1px 4px;border-radius:4px;font-size:13px}
.error{color:var(--err);min-height:18px;margin:4px 0}
.muted{color:var(--muted);font-size:13px}
.row{display:flex;gap:8px}
.spacer{flex:1}

/* карточки-экраны */
.screen{min-height:100%;display:flex;align-items:center;justify-content:center;padding:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px;max-width:380px;width:100%;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.card h1{margin:0 0 12px;font-size:22px}
.card p{margin:8px 0}
.card label{display:block;margin:10px 0;font-size:14px}
.card input{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:8px;font:inherit;margin-top:4px}
.card button{padding:9px 14px;border:0;border-radius:8px;background:var(--brand);color:#fff;font:inherit;cursor:pointer}
.card button:hover{background:var(--brand-d)}
.card #signup-btn{background:#e5e7eb;color:var(--ink)}
.card #signup-btn:hover{background:#d1d5db}

/* чат-ап */
.chat-app{display:grid;grid-template-columns:240px 1fr;height:100%}
.sidebar{background:var(--header);color:#e5e7eb;display:flex;flex-direction:column;height:100%}
.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid #374151}
.brand{font-weight:600;font-size:16px}
.sidebar nav{flex:1;overflow:auto;padding:8px}
.sidebar nav button{display:block;width:100%;text-align:left;background:none;border:0;color:#d1d5db;padding:9px 10px;border-radius:8px;font:inherit;cursor:pointer;margin:2px 0}
.sidebar nav button:hover{background:#374151}
.sidebar nav button.active{background:var(--brand);color:#fff}
.header-btns{display:flex;gap:2px;align-items:center}
.dm-new-bar{padding:6px 8px;border-top:1px solid #374151}
.dm-new-bar button{color:#93c5fd;font-size:13px}
.ch-section-label{color:#9ca3af;font-size:11px;text-transform:uppercase;letter-spacing:.5px;padding:10px 10px 4px}
.dm-user-btn{display:flex;width:100%;text-align:left;background:none;border:0;color:#d1d5db;padding:8px 10px;border-radius:8px;font:inherit;cursor:pointer;margin:1px 0}
.dm-user-btn:hover{background:#374151}
.sidebar-footer{padding:10px 14px;border-top:1px solid #374151;display:flex;justify-content:space-between;align-items:center}
.icon-btn{background:none;border:0;color:inherit;font-size:18px;cursor:pointer;padding:4px}
.link-btn{background:none;border:0;color:#93c5fd;cursor:pointer;font:inherit;text-decoration:underline}

.main{display:flex;flex-direction:column;height:100%;background:var(--bg)}
.chat-header{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--panel);border-bottom:1px solid var(--line)}
.chat-header #current-channel{font-weight:600}
.badge{background:var(--ok);color:#fff;font-size:11px;padding:2px 6px;border-radius:6px}

.messages{flex:1;overflow:auto;padding:12px;display:flex;flex-direction:column;gap:8px}
.msg{max-width:78%;padding:8px 11px;border-radius:12px;background:var(--panel);border:1px solid var(--line);word-wrap:break-word;overflow-wrap:anywhere}
.msg.own{background:var(--own);border-color:#bfdbfe;align-self:flex-end}
.msg .meta{font-size:11px;color:var(--muted);margin-top:4px}
.msg .meta .author{color:#374151;font-weight:500}
.msg-attachment{display:inline-flex;align-items:center;gap:6px;margin-top:6px;padding:6px 8px;background:#eef2ff;border:1px solid #c7d2fe;border-radius:8px;text-decoration:none;color:#3730a3;font-size:13px}
.msg-attachment img{max-width:100%;max-height:260px;border-radius:8px;display:block;margin-top:6px}
.msg-thumb{max-width:220px;max-height:220px;border-radius:8px;cursor:pointer;display:block;margin-top:6px;object-fit:cover;transition:opacity .15s}
.msg-thumb:hover{opacity:.85}
.lightbox{position:fixed;inset:0;z-index:40;background:rgba(0,0,0,.85);display:flex;align-items:center;justify-content:center;cursor:pointer;padding:20px}
.lightbox img{max-width:100%;max-height:100%;border-radius:8px;object-fit:contain}
.msg-actions{display:flex;gap:2px;margin-top:3px;opacity:.5;transition:opacity .15s}
.msg:hover .msg-actions{opacity:1}
.msg-actions button{background:none;border:0;cursor:pointer;font-size:13px;padding:2px 6px;border-radius:4px;color:var(--muted)}
.msg-actions button:hover{background:rgba(0,0,0,.08)}
.edit-input{width:100%;border:1px solid var(--line);border-radius:6px;padding:6px 8px;font:inherit;font-size:14px;resize:vertical}
.edit-actions{display:flex;gap:6px;margin-top:4px}
.edit-actions button{padding:4px 12px;border:0;border-radius:6px;cursor:pointer;font:inherit;font-size:13px}
.edit-save{background:var(--ok);color:#fff}
.edit-cancel{background:#e5e7eb;color:var(--ink)}
.edit-attach{display:flex;align-items:center;gap:8px;margin-top:6px;flex-wrap:wrap}
.edit-del-file{background:#fee2e2;color:#dc2626;border:1px solid #fecaca;border-radius:6px;padding:4px 10px;cursor:pointer;font:inherit;font-size:12px}
.edit-del-file:hover{background:#fecaca}
.avatar-section{margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.avatar-wrap{display:inline-block}
.avatar-large{width:72px;height:72px;border-radius:50%;object-fit:cover;display:flex;align-items:center;justify-content:center;font-size:28px;color:#fff;background:var(--brand)}
.avatar-large.hidden{display:none!important}
.avatar-placeholder{font-weight:600}
.avatar-mini{width:22px;height:22px;border-radius:50%;object-fit:cover;display:inline-flex;align-items:center;justify-content:center;font-size:11px;color:#fff;background:#6b7280;vertical-align:middle;margin-right:4px;flex-shrink:0}
.avatar-img-mini{width:22px;height:22px;border-radius:50%;object-fit:cover;margin-right:4px;vertical-align:middle}
.reply-preview{padding:6px 12px;background:#eef2ff;border-top:1px solid #c7d2fe;font-size:13px;display:flex;align-items:center;gap:8px}
.reply-preview .reply-text{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#3730a3}
.reply-quote{border-left:3px solid var(--brand);padding:3px 8px;margin-bottom:4px;font-size:12px;color:var(--muted);background:#f3f4f6;border-radius:0 4px 4px 0;cursor:pointer;overflow:hidden}
.reply-quote:hover{background:#e5e7eb}
.reply-quote .reply-quote-author{font-weight:600;color:#374151}
.conn-dot{display:inline-block;width:8px;height:8px;border-radius:50%;flex-shrink:0;transition:background .3s}
.conn-online{background:var(--ok)}
.conn-reconnecting{background:#f59e0b;animation:pulse 1s infinite}
.conn-offline{background:var(--err)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.loading-top{text-align:center;padding:8px;color:var(--muted);font-size:13px}
.msg-status{font-size:11px;margin-left:4px;color:var(--muted)}
.msg-sending{opacity:.55}
.msg-error .msg-body{color:var(--err)}
.unread-badge{background:var(--err);color:#fff;font-size:11px;padding:1px 6px;border-radius:10px;margin-left:6px;min-width:16px;text-align:center;font-weight:600}
.unread-badge.hidden{display:none}
.new-separator{display:flex;align-items:center;gap:8px;margin:8px 0;color:var(--brand);font-size:12px;font-weight:600}
.new-separator::before,.new-separator::after{content:"";flex:1;height:1px;background:var(--brand);opacity:.4}
.new-separator span{white-space:nowrap}
.search-result{padding:8px 4px;border-bottom:1px solid var(--line);cursor:pointer;font-size:13px;line-height:1.4}
.search-result:hover{background:#f3f4f6;border-radius:6px}
.search-result .author{font-weight:600;color:#374151}
#broadcast-btn{font-size:18px;padding:0 6px;background:none;border:0;cursor:pointer;color:var(--muted)}
#broadcast-btn.active{color:var(--brand);background:#dbeafe;border-radius:6px}
.msg-form.broadcast-mode{background:#eff6ff;border-top-color:#bfdbfe}
.edited{font-size:10px;color:var(--muted);font-style:italic}
@media (max-width:720px){
  .msg-thumb{max-width:160px;max-height:160px}
}

.msg-form{display:flex;gap:6px;padding:10px;background:var(--panel);border-top:1px solid var(--line)}
.msg-form input[type=text]{flex:1;padding:9px 10px;border:1px solid var(--line);border-radius:8px;font:inherit}
.msg-form button{padding:9px 16px;border:0;border-radius:8px;background:var(--brand);color:#fff;font:inherit;cursor:pointer}
.msg-form button:disabled{background:#9ca3af}
.attach-btn{display:flex;align-items:center;cursor:pointer;padding:0 8px;font-size:18px}
.attach-preview{padding:6px 12px;background:#fef9c3;border-top:1px solid #fde68a;font-size:13px}
.drag-over{outline:3px dashed var(--brand);outline-offset:-6px;background:#eff6ff}

/* mobile */
#menu-open{display:none}
@media (max-width:720px){
  .chat-app{grid-template-columns:1fr}
  .sidebar{position:fixed;top:0;left:0;width:240px;height:100%;z-index:20;transform:translateX(-100%);transition:transform .2s}
  .sidebar.open{transform:none}
  #menu-open{display:block}
  .msg{max-width:90%}
}
.scrim{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:19}
@media (min-width:721px){.scrim{display:none}}

/* admin */
.footer-btns{display:flex;gap:6px;flex-direction:column;align-items:flex-end}
.admin-modal{position:fixed;inset:0;z-index:30;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;padding:16px}
.admin-modal-inner{background:var(--panel);border-radius:12px;width:100%;max-width:780px;max-height:92vh;display:flex;flex-direction:column;box-shadow:0 4px 24px rgba(0,0,0,.18)}
.admin-modal-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--line)}
.admin-modal-header h2{margin:0;font-size:18px}
.admin-content{overflow:auto;padding:12px 16px;-webkit-overflow-scrolling:touch}
.admin-table{width:100%;border-collapse:collapse;font-size:13px}
.admin-table th,.admin-table td{border:1px solid var(--line);padding:6px 8px;text-align:center;white-space:nowrap}
.admin-table th{background:#f9fafb;font-weight:600}
.admin-table td.name{text-align:left;white-space:normal;max-width:220px;word-break:break-all}
.admin-table .chk{width:22px;height:22px;cursor:pointer;vertical-align:middle}
.admin-status{font-size:11px;padding:3px 8px;border-radius:6px;border:0;cursor:pointer;font:inherit}
.admin-status.on{background:#dcfce7;color:#16a34a}
.admin-status.off{background:#fee2e2;color:#dc2626}
.admin-status.pending{background:#fef9c3;color:#ca8a04}
.admin-status:hover{opacity:.8}
.admin-channels{margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.admin-channels h3{margin:0 0 8px;font-size:15px}
.admin-ch-row{display:flex;gap:6px;align-items:center;margin:5px 0;flex-wrap:wrap}
.admin-ch-name{flex:1;min-width:120px;padding:6px 8px;border:1px solid var(--line);border-radius:6px;font:inherit;font-size:13px}
.admin-tabs{display:flex;border-bottom:1px solid var(--line)}
.admin-tab{flex:1;padding:10px;border:0;background:#f9fafb;font:inherit;font-size:14px;cursor:pointer;border-bottom:3px solid transparent}
.admin-tab.active{background:var(--panel);border-bottom-color:var(--brand);font-weight:600}
.admin-tab-panel{padding:0}
.admin-autojoin{display:flex;align-items:center;gap:4px;font-size:12px;white-space:nowrap}
.admin-invite-row{display:flex;gap:6px;align-items:center;margin:2px 0 10px;flex-wrap:wrap}
.admin-invite-row code{font-size:11px;word-break:break-all;background:#f3f4f6;padding:3px 6px;border-radius:4px;flex:1;min-width:140px}
.admin-content h3{margin:14px 0 6px;font-size:15px}
.admin-content p{margin:5px 0;font-size:14px;line-height:1.5}
@media (max-width:720px){
  .admin-table{font-size:12px}
  .admin-table th,.admin-table td{padding:4px 5px}
  .admin-table td.name{max-width:130px}
}