:root{
  --bg:#0f172a; --panel:#1e293b; --panel-2:#243149; --line:#334155;
  --text:#e2e8f0; --muted:#94a3b8; --accent:#6366f1; --accent-2:#8b5cf6;
  --ok:#34d399; --warn:#fbbf24; --bad:#f87171; --radius:14px;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,'Segoe UI',Tahoma,Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:inherit;text-decoration:none}
.layout{display:flex;min-height:100vh}

/* Sidebar */
.sidebar{width:250px;background:var(--panel);border-left:1px solid var(--line);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.brand{font-size:20px;font-weight:800;padding:22px 20px;border-bottom:1px solid var(--line);
  background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.sidebar nav{padding:12px;display:flex;flex-direction:column;gap:4px;flex:1}
.sidebar nav a{display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:10px;color:var(--muted);font-weight:600;position:relative}
.sidebar nav a:hover{background:var(--panel-2);color:var(--text)}
.sidebar nav a.active{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}
.sidebar nav a .ic{font-size:18px}
.badge{position:absolute;left:12px;background:var(--bad);color:#fff;font-size:11px;font-weight:700;
  min-width:20px;text-align:center;padding:2px 6px;border-radius:20px}
.sidebar-foot{padding:14px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}
.who{display:flex;flex-direction:column;font-weight:600;font-size:14px}
.who small{color:var(--muted);font-weight:400}
.logout{color:var(--bad);font-size:13px;font-weight:600}

/* Content */
.content{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{padding:20px 28px;border-bottom:1px solid var(--line);background:rgba(30,41,59,.5);backdrop-filter:blur(6px)}
.topbar h1{margin:0;font-size:22px}
.page{padding:24px 28px}

/* Cards / stats */
.grid{display:grid;gap:16px}
.stats{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.stat .label{color:var(--muted);font-size:13px;margin-bottom:6px}
.stat .num{font-size:28px;font-weight:800}
.stat .num.ok{color:var(--ok)} .stat .num.warn{color:var(--warn)} .stat .num.accent{color:var(--accent)}

/* Tables */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:12px 14px;text-align:right;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600;font-size:13px}
tr:hover td{background:var(--panel-2)}
.table-wrap{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}

/* Pills */
.pill{display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:700}
.pill.gray{background:#334155;color:#cbd5e1}
.pill.ok{background:rgba(52,211,153,.15);color:var(--ok)}
.pill.warn{background:rgba(251,191,36,.15);color:var(--warn)}
.pill.bad{background:rgba(248,113,113,.15);color:var(--bad)}
.pill.accent{background:rgba(99,102,241,.18);color:#a5b4fc}

/* Forms */
.btn{display:inline-flex;align-items:center;gap:6px;background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;border:0;padding:10px 18px;border-radius:10px;font-weight:700;cursor:pointer;font-size:14px}
.btn.sm{padding:6px 12px;font-size:13px}
.btn.ghost{background:var(--panel-2);color:var(--text);border:1px solid var(--line)}
.btn.bad{background:var(--bad)} .btn.ok{background:var(--ok)}
input,textarea,select{width:100%;background:var(--bg);border:1px solid var(--line);color:var(--text);
  padding:10px 12px;border-radius:10px;font-size:14px;font-family:inherit}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent)}
label{display:block;font-size:13px;color:var(--muted);margin:0 0 6px}
.field{margin-bottom:14px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;gap:12px;flex-wrap:wrap}
.alert{padding:12px 16px;border-radius:10px;margin-bottom:16px;font-weight:600}
.alert.ok{background:rgba(52,211,153,.12);color:var(--ok)}
.alert.bad{background:rgba(248,113,113,.12);color:var(--bad)}

/* Login */
.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh}
.login-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:36px;width:360px}
.login-card h2{margin:0 0 6px;text-align:center}
.login-card p{color:var(--muted);text-align:center;margin:0 0 22px;font-size:14px}

/* Chat (conversations) */
.chat-layout{display:grid;grid-template-columns:320px 1fr;gap:0;height:calc(100vh - 130px);
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.conv-list{border-left:1px solid var(--line);overflow-y:auto}
.conv-item{padding:14px 16px;border-bottom:1px solid var(--line);cursor:pointer}
.conv-item:hover{background:var(--panel-2)}
.conv-item.active{background:var(--panel-2);border-right:3px solid var(--accent)}
.conv-item .top{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}
.conv-item .name{font-weight:700}
.conv-item .preview{color:var(--muted);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-main{display:flex;flex-direction:column;min-width:0}
.chat-head{padding:14px 18px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}
.chat-body{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:10px;background:var(--bg)}
.bubble{max-width:70%;padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.6;white-space:pre-wrap;word-wrap:break-word}
.bubble.in{align-self:flex-start;background:var(--panel-2);border-bottom-right-radius:4px}
.bubble.out{align-self:flex-end;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border-bottom-left-radius:4px}
.bubble .meta{display:block;font-size:11px;opacity:.7;margin-top:4px}
.chat-input{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line)}
.empty{display:flex;align-items:center;justify-content:center;height:100%;color:var(--muted)}

/* Professional chat: 3 columns (list | chat | customer panel) */
.chat-layout.pro{grid-template-columns:300px 1fr 250px}
.conv-col{border-left:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.conv-head{padding:12px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:10px}
.conv-head input{padding:8px 12px}
.filter-tabs{display:flex;gap:4px;flex-wrap:wrap}
.filter-tabs .ft{flex:1;background:var(--bg);border:1px solid var(--line);color:var(--muted);
  padding:6px 4px;border-radius:8px;font-size:11px;font-weight:700;cursor:pointer;white-space:nowrap}
.filter-tabs .ft.active{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border-color:transparent}
.conv-col .conv-list{flex:1;border:0}
.canned{display:flex;gap:6px;padding:8px 12px;border-top:1px solid var(--line);overflow-x:auto}
.canned .chip{background:var(--panel-2);border:1px solid var(--line);color:var(--text);
  padding:6px 10px;border-radius:16px;font-size:12px;cursor:pointer;white-space:nowrap;flex-shrink:0}
.canned .chip:hover{border-color:var(--accent)}
.cust-panel{border-right:1px solid var(--line);padding:16px;overflow-y:auto}
.cp-name{font-weight:800;font-size:16px}
.cp-sub{color:var(--muted);font-size:13px}
.cp-stats{display:flex;gap:10px;margin:14px 0}
.cp-stats>div{flex:1;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px;text-align:center}
.cp-stats b{display:block;font-size:20px;color:var(--accent)}
.cp-stats span{font-size:11px;color:var(--muted)}
.cp-spent{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px;text-align:center;font-size:12px;color:var(--muted)}
.cp-spent b{font-size:16px;color:var(--ok)}
@media(max-width:980px){.chat-layout.pro{grid-template-columns:1fr}.cust-panel{display:none}}
.muted{color:var(--muted)}
.flex{display:flex;gap:8px;align-items:center}
.between{display:flex;justify-content:space-between;align-items:center}
@media(max-width:760px){.sidebar{display:none}.chat-layout{grid-template-columns:1fr}.conv-list{display:none}}