:root {
  --bg: #0b1220;
  --panel: #131c2e;
  --panel-2: #18233a;
  --line: #243049;
  --txt: #d7e0f0;
  --muted: #8a99b5;
  --accent: #2f9bff;
  --ok: #2ecc71;
  --warn: #f1c40f;
  --crit: #ff5a5a;
  --grid: rgba(255,255,255,.06);
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 70% -10%, #15233f 0%, var(--bg) 60%);
  color: var(--txt); min-height: 100vh;
}
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; background: linear-gradient(90deg, #0e1830, #12203b);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo { color: var(--accent); font-size: 22px; }
.title { font-size: 18px; font-weight: 600; letter-spacing: 1px; }
.badge {
  font-size: 12px; padding: 2px 10px; border-radius: 20px;
  background: #1c3052; color: #6fb6ff; border: 1px solid #2c4a72;
}
.top-right { display: flex; align-items: center; gap: 18px; }
.clock { color: var(--muted); font-variant-numeric: tabular-nums; }
.ws { font-size: 12px; padding: 2px 10px; border-radius: 20px; }
.ws.on { color: var(--ok); background: rgba(46,204,113,.12); }
.ws.off { color: var(--crit); background: rgba(255,90,90,.12); }

.kpis {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px;
  padding: 16px 20px 4px;
}
.kpi {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 16px; position: relative; overflow: hidden;
}
.kpi .v { font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; }
.kpi .l { color: var(--muted); font-size: 12px; margin-top: 4px; }
.kpi.crit .v { color: var(--crit); }
.kpi.warn .v { color: var(--warn); }
.kpi.ok .v { color: var(--ok); }

.grid {
  display: grid; grid-template-columns: 260px 1fr 320px; gap: 16px;
  padding: 16px 20px 28px;
}
.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 16px; margin-bottom: 16px;
}
.panel h2 { font-size: 14px; margin: 0 0 12px; color: #c7d3ea; font-weight: 600; }
.panel h2 small { color: var(--muted); font-weight: 400; }

.subsys-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.sub-card {
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px; display: flex; flex-direction: column; gap: 6px;
}
.sub-card .icon { font-size: 20px; }
.sub-card .name { font-size: 13px; }
.sub-card .meta { font-size: 11px; color: var(--muted); }
.sub-card.alert { border-color: var(--crit); box-shadow: 0 0 0 1px rgba(255,90,90,.4); }

.center { display: flex; flex-direction: column; gap: 16px; }
.topo-canvas {
  height: 320px; background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0/40px 40px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0/40px 40px,
    #0e1726;
  border-radius: 10px; position: relative;
}
.topo-node {
  position: absolute; width: 38px; height: 38px; transform: translate(-50%,-50%);
  border-radius: 9px; display: flex; align-items: center; justify-content: center;
  font-size: 18px; border: 1px solid var(--line); background: #1a2740; cursor: pointer;
}
.topo-node.alarm { border-color: var(--crit); animation: blink 1s infinite; }
@keyframes blink { 50% { background: #4a1d22; } }

.charts { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.chart-box { height: 200px; }

.alarm-list { max-height: 360px; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; }
.alarm-item {
  background: var(--panel-2); border-left: 3px solid var(--muted);
  border-radius: 8px; padding: 8px 10px; font-size: 12px;
}
.alarm-item.critical { border-left-color: var(--crit); }
.alarm-item.warning { border-left-color: var(--warn); }
.alarm-item .t { color: var(--muted); font-size: 11px; }
.pill { background: var(--crit); color: #fff; border-radius: 20px; padding: 0 8px; font-size: 11px; }

.dev-status { display: flex; flex-direction: column; gap: 6px; max-height: 280px; overflow-y: auto; }
.ds-row { display: flex; justify-content: space-between; font-size: 12px; padding: 6px 8px;
  background: var(--panel-2); border-radius: 8px; }
.ds-row .dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 6px; }
.dot.ok { background: var(--ok); } .dot.warn { background: var(--warn); } .dot.crit { background: var(--crit); }

@media (max-width: 1200px) {
  .grid { grid-template-columns: 1fr; }
  .kpis { grid-template-columns: repeat(3,1fr); }
  .charts { grid-template-columns: 1fr; }
}

/* ---------------- 导航 ---------------- */
.nav { display: flex; gap: 6px; }
.nav-item {
  background: transparent; color: var(--muted); border: 1px solid transparent;
  padding: 6px 14px; border-radius: 8px; cursor: pointer; font-size: 13px;
  transition: .15s;
}
.nav-item:hover { color: var(--txt); background: rgba(255,255,255,.05); }
.nav-item.active { color: #fff; background: var(--accent); border-color: var(--accent); }
.who { color: var(--muted); font-size: 12px; }

/* ---------------- 登录遮罩 ---------------- */
.overlay {
  position: fixed; inset: 0; z-index: 100; display: flex;
  align-items: center; justify-content: center;
  background: radial-gradient(800px 400px at 50% 30%, #16243f, #0a0f1a 70%);
}
.login-card {
  width: 320px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; padding: 28px 26px; display: flex; flex-direction: column; gap: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.login-card h1 { font-size: 18px; margin: 0; text-align: center; }
.login-card .logo { color: var(--accent); }
.login-card .sub { margin: 0 0 6px; color: var(--muted); font-size: 12px; text-align: center; }
.login-card input {
  background: #0e1726; border: 1px solid var(--line); color: var(--txt);
  padding: 10px 12px; border-radius: 8px; font-size: 14px; outline: none;
}
.login-card input:focus { border-color: var(--accent); }
.login-card .err { color: var(--crit); font-size: 12px; min-height: 14px; }
.login-card .hint { color: var(--muted); font-size: 11px; line-height: 1.5; }

/* ---------------- 按钮 ---------------- */
.btn {
  background: var(--panel-2); color: var(--txt); border: 1px solid var(--line);
  padding: 7px 14px; border-radius: 8px; cursor: pointer; font-size: 13px; transition: .15s;
}
.btn:hover { border-color: var(--accent); color: #fff; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--crit); border-color: rgba(255,90,90,.4); }
.btn.sm { padding: 4px 10px; font-size: 12px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------------- 表单 / 筛选 ---------------- */
.filters { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: flex-end; margin-bottom: 14px; }
.filters label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.filters input, .filters select {
  background: #0e1726; border: 1px solid var(--line); color: var(--txt);
  padding: 7px 10px; border-radius: 8px; font-size: 13px; outline: none; min-width: 130px;
}
.filters input[type="datetime-local"] { min-width: 180px; }
.filters input:focus, .filters select:focus { border-color: var(--accent); }

/* ---------------- 表格 ---------------- */
.tbl { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 6px; }
.tbl th, .tbl td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); }
.tbl th { color: var(--muted); font-weight: 500; background: var(--panel-2); }
.tbl tr:hover td { background: rgba(255,255,255,.03); }
.tbl .sub { color: var(--muted); font-size: 12px; }
.tbl .acts { white-space: nowrap; }
.tbl .crit { color: var(--crit); }
.tbl .warning { color: var(--warn); }

.tag { font-size: 11px; padding: 2px 8px; border-radius: 20px; }
.tag.ok { color: var(--ok); background: rgba(46,204,113,.12); }
.tag.off { color: var(--warn); background: rgba(241,196,15,.12); }

/* ---------------- 弹窗 ---------------- */
.modal-mask {
  position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,.55);
  display: flex; align-items: center; justify-content: center;
}
.modal {
  width: 460px; max-width: 92vw; background: var(--panel); border: 1px solid var(--line);
  border-radius: 14px; padding: 20px 22px; display: flex; flex-direction: column; gap: 14px;
}
.modal h3 { margin: 0; font-size: 16px; }
.modal-body { display: flex; flex-direction: column; gap: 12px; max-height: 60vh; overflow-y: auto; }
.modal-body label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.modal-body label.ck { flex-direction: row; align-items: center; gap: 8px; color: var(--txt); }
.modal-body input, .modal-body select {
  background: #0e1726; border: 1px solid var(--line); color: var(--txt);
  padding: 8px 10px; border-radius: 8px; font-size: 13px; outline: none;
}
.modal-body input:focus, .modal-body select:focus { border-color: var(--accent); }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; }

/* ---------------- 视频监控 ---------------- */
.cam-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.cam-card { background: var(--panel-2); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.cam-head { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.cam-name { font-size: 13px; flex: 1; }
.cam-screen { position: relative; aspect-ratio: 16 / 9; background: #060b14; display: flex; align-items: center; justify-content: center; }
.cam-video { width: 100%; height: 100%; object-fit: contain; background: #060b14; }
.cam-ph { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 0 16px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.cam-foot { padding: 8px 12px; font-size: 11px; color: var(--muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cam-empty { color: var(--muted); font-size: 13px; padding: 20px; }

@media (max-width: 1200px) {
  .cam-grid { grid-template-columns: 1fr; }
}