:root {
  --bg: #0a0e14;
  --surface: #0d1117;
  --surface2: #161b22;
  --surface3: #1c2330;
  --border: #21262d;
  --border2: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --hint: #484f58;
  --green: #3fb950;
  --green-bg: rgba(63,185,80,0.12);
  --amber: #d29922;
  --amber-bg: rgba(210,153,34,0.15);
  --red: #f85149;
  --red-bg: rgba(248,81,73,0.15);
  --pink: #db61a2;
  --pink-bg: rgba(219,97,162,0.15);
  --blue: #58a6ff;
  --blue-bg: rgba(88,166,255,0.1);
  --teal: #39d353;
  --font: 'Segoe UI', system-ui, sans-serif;
  --mono: 'Courier New', monospace;
  --r: 8px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; }

/* ── Topbar ── */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky; top: 0; z-index: 100;
}
.topbar-left { display: flex; align-items: center; gap: 14px; }
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.logo-badge { background: var(--blue-bg); border: 1px solid var(--blue); color: var(--blue); font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 4px; letter-spacing: .05em; }
.logo-text { font-size: 14px; font-weight: 600; color: var(--text); }
.nav { display: flex; gap: 2px; }
.nav a { color: var(--muted); font-size: 13px; text-decoration: none; padding: 6px 12px; border-radius: 6px; transition: all .15s; }
.nav a:hover { color: var(--text); background: var(--surface2); }
.nav a.active { color: var(--green); background: var(--green-bg); }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.datetime { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.conn-pill { display: flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 12px; font-size: 11px; font-weight: 600; }
.conn-ok  { background: var(--green-bg); border: 1px solid rgba(63,185,80,.4); color: var(--green); }
.conn-err { background: var(--red-bg);   border: 1px solid rgba(248,81,73,.4); color: var(--red); }
.conn-dot { width: 6px; height: 6px; border-radius: 50%; }
.dot-green { background: var(--green); }
.dot-red   { background: var(--red); }
.user-btn { background: var(--surface2); border: 1px solid var(--border2); border-radius: 6px; padding: 4px 10px; font-size: 12px; color: var(--muted); cursor: pointer; display: flex; align-items: center; gap: 5px; }
.user-btn:hover { color: var(--text); }

/* ── Layout ── */
.main { padding: 20px; max-width: 1400px; margin: 0 auto; }
.section-label { font-size: 11px; font-weight: 600; letter-spacing: .07em; color: var(--muted); text-transform: uppercase; margin-bottom: 12px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 14px 16px; }
.card-title { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 12px; display: flex; align-items: center; gap: 7px; }

/* ── Detector reading box ── */
.det-box {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  background: var(--surface2);
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
  text-align: center;
  min-width: 80px;
}
.det-box:hover { border-color: var(--border2); }
.det-box .det-num { font-size: 10px; color: var(--muted); margin-bottom: 2px; }
.det-box .det-val { font-family: var(--mono); font-size: 18px; font-weight: 700; color: var(--green); line-height: 1; }
.det-box .det-unit { font-size: 10px; color: var(--muted); }
.det-box .cal-due { font-size: 9px; font-weight: 700; color: var(--amber); animation: flash .8s infinite; margin-top: 2px; }
@keyframes flash { 0%,100%{opacity:1} 50%{opacity:0} }

/* Status colours */
.det-box.normal  { border-color: rgba(63,185,80,.3); }
.det-box.normal .det-val  { color: var(--green); }
.det-box.alarm1  { border-color: var(--amber); background: var(--amber-bg); }
.det-box.alarm1 .det-val  { color: var(--amber); }
.det-box.alarm2  { border-color: var(--red); background: var(--red-bg); animation: pulse-red .6s infinite; }
.det-box.alarm2 .det-val  { color: var(--red); }
.det-box.offline { border-color: var(--hint); }
.det-box.offline .det-val { color: var(--hint); }
@keyframes pulse-red { 0%,100%{box-shadow:0 0 0 0 rgba(248,81,73,.4)} 50%{box-shadow:0 0 0 6px rgba(248,81,73,0)} }

/* ── Stat cards ── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 10px; margin-bottom: 20px; }
.stat-card { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--r); padding: 14px 16px; }
.stat-label { font-size: 11px; color: var(--muted); margin-bottom: 6px; }
.stat-val { font-size: 28px; font-weight: 700; font-family: var(--mono); }
.stat-card.green .stat-val { color: var(--green); }
.stat-card.amber .stat-val { color: var(--amber); }
.stat-card.red   .stat-val { color: var(--red); }
.stat-card.pink  .stat-val { color: var(--pink); }
.stat-card.blue  .stat-val { color: var(--blue); }

/* ── Buttons ── */
.btn { padding: 7px 14px; border-radius: 6px; font-size: 13px; font-weight: 500; cursor: pointer; font-family: var(--font); border: 1px solid var(--border2); background: var(--surface2); color: var(--text); transition: all .15s; display: inline-flex; align-items: center; gap: 6px; }
.btn:hover { border-color: var(--muted); }
.btn-primary { background: var(--green-bg); border-color: rgba(63,185,80,.5); color: var(--green); }
.btn-primary:hover { background: rgba(63,185,80,.2); }
.btn-danger { background: var(--red-bg); border-color: rgba(248,81,73,.5); color: var(--red); }
.btn-amber { background: var(--amber-bg); border-color: rgba(210,153,34,.5); color: var(--amber); }

/* ── Modal ── */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.7); z-index: 200; align-items: center; justify-content: center; }
.modal-overlay.open { display: flex; }
.modal { background: var(--surface); border: 1px solid var(--border2); border-radius: 12px; padding: 20px; min-width: 360px; max-width: 500px; width: 100%; }
.modal-title { font-size: 15px; font-weight: 600; margin-bottom: 16px; display: flex; justify-content: space-between; align-items: center; }
.modal-close { cursor: pointer; color: var(--muted); font-size: 18px; }
.modal-close:hover { color: var(--text); }
.form-group { margin-bottom: 12px; }
.form-group label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 5px; }
.form-group input, .form-group select {
  width: 100%; padding: 8px 10px; border-radius: 6px; border: 1px solid var(--border2);
  background: var(--surface2); color: var(--text); font-size: 13px; font-family: var(--font);
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--blue); }

/* ── Legend ── */
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 11px; color: var(--muted); }
.legend-item { display: flex; align-items: center; gap: 5px; }
.legend-dot { width: 10px; height: 10px; border-radius: 3px; }
.ld-green { background: var(--green); }
.ld-amber { background: var(--amber); }
.ld-red   { background: var(--red); }
.ld-pink  { background: var(--pink); }
.ld-gray  { background: var(--hint); }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }