:root {
  --bg: #1e2026;
  --card: #2c2f38;
  --line: #3c404a;
  --text: #e6e8ec;
  --sub: #a0a4ac;
  --good: #2ea057;
  --warn: #d24646;
  --idle: #5a5e68;
  --blue: #3c64b4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 14px;
}

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card);
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, #14a096, #285ac8);
  border-radius: 11px; padding: 5px;
}
.conn-line { display: flex; align-items: center; gap: 9px; }
.conn-label { font-size: 16px; font-weight: 600; }
.conn-sub { color: var(--sub); font-size: 12px; }
.dot { width: 14px; height: 14px; border-radius: 50%; background: var(--idle); }
.dot.good { background: var(--good); box-shadow: 0 0 8px var(--good); }
.dot.warn { background: var(--warn); }
.dot.idle { background: var(--idle); }
.dot.busy { background: goldenrod; }

/* ---------- buttons ---------- */
.btn {
  border: 0; border-radius: 7px; color: #fff; cursor: pointer;
  font-size: 14px; font-weight: 600; padding: 9px 16px;
  transition: filter .15s;
}
.btn:hover:not(:disabled) { filter: brightness(1.1); }
.btn:disabled { opacity: .5; cursor: default; }
.btn-blue { background: var(--blue); }
.btn-green { background: var(--good); }
.btn-red { background: var(--warn); }
.btn.full { width: 100%; margin-top: 12px; }

.unsupported {
  background: #5a2020; color: #ffd9d9; padding: 12px 18px; text-align: center;
}
.hidden { display: none; }

/* ---------- layout ---------- */
.layout { display: flex; gap: 16px; padding: 16px; align-items: flex-start; }
.side { width: 340px; flex: 0 0 340px; display: flex; flex-direction: column; gap: 16px; }
.content { flex: 1; display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px;
}
.card h3 {
  margin: 0 0 12px; font-size: 11px; letter-spacing: .04em;
  text-transform: uppercase; color: var(--sub); font-weight: 600;
}
.muted { color: var(--sub); }
.small { font-size: 12px; }

/* ---------- CTS LED ---------- */
.cts-row { display: flex; align-items: center; gap: 16px; }
.led {
  width: 46px; height: 46px; border-radius: 50%;
  background: radial-gradient(circle at 38% 34%, #888, #4a4e58);
  border: 1px solid rgba(0,0,0,.4);
  transition: background .15s, box-shadow .15s;
}
.led.green {
  background: radial-gradient(circle at 38% 34%, #7bf0a5, #1d8a45);
  box-shadow: 0 0 16px 3px rgba(46,160,87,.8);
}
.led.red {
  background: radial-gradient(circle at 38% 34%, #ff9d9d, #b22b2b);
  box-shadow: 0 0 16px 3px rgba(210,70,70,.85);
}
.cts-text { font-size: 15px; font-weight: 600; }

/* ---------- return loss ---------- */
.rl {
  display: flex; align-items: center; justify-content: space-between;
  border-radius: 8px; padding: 12px 14px; margin-bottom: 10px; color: #fff;
}
.rl.idle { background: var(--idle); }
.rl.good { background: var(--good); }
.rl.warn { background: var(--warn); }
.rl-name { font-weight: 600; font-size: 15px; }
.rl-val { font-weight: 700; font-size: 22px; }

/* ---------- settings ---------- */
.field-grid { display: flex; gap: 12px; }
.field-grid label {
  flex: 1; display: flex; flex-direction: column; gap: 6px;
  font-size: 12px; color: var(--sub);
}
.field-grid input {
  background: #24262e; border: 1px solid var(--line); color: var(--text);
  border-radius: 6px; padding: 8px; font-size: 16px;
}

/* ---------- module kv ---------- */
.kv {
  display: flex; justify-content: space-between; align-items: center;
  padding: 5px 0; border-bottom: 1px solid rgba(255,255,255,.04);
}
.kv:last-child { border-bottom: 0; }
.kv span { color: var(--sub); }
.kv b { font-family: Consolas, monospace; font-size: 15px; }
.kv b.bad { color: var(--warn); }

/* ---------- reading ---------- */
.readbar { display: flex; align-items: center; gap: 16px; }
.readbar .btn { min-width: 180px; }
.table-wrap {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; overflow: auto; max-height: calc(100vh - 170px);
}
table { width: 100%; border-collapse: collapse; }
thead th {
  position: sticky; top: 0; background: #24262e; color: var(--text);
  text-align: left; padding: 9px 12px; font-size: 12px;
  border-bottom: 1px solid var(--line);
}
tbody td { padding: 6px 12px; font-size: 13px; border-bottom: 1px solid rgba(255,255,255,.03); }
.mono { font-family: Consolas, monospace; }