:root {
  --bg: #eef4fb;
  --card: #ffffff;
  --line: #d6e3f1;
  --text: #082853;
  --muted: #5d7396;
  --blue: #1e63d6;
  --red: #b12c2c;
  --green: #147a4d;
  --warn: #9a6500;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Aptos", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #dcecff 0, var(--bg) 38rem);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 1.4rem 2rem;
}
.topbar h1 { margin: 0; font-size: 2rem; }
.topbar p { margin: .2rem 0 0; color: var(--muted); }
nav { display: flex; gap: .7rem; flex-wrap: wrap; }
nav a, .button, button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: .75rem;
  padding: .72rem 1rem;
  font-weight: 700;
  cursor: pointer;
}
button, .primary { background: var(--blue); border-color: var(--blue); color: white; }
.danger { background: #fff3f3; color: var(--red); border-color: #f0b9b9; }
.small { padding: .45rem .65rem; font-size: .86rem; }
.page { padding: 0 2rem 2rem; }
.card, .stats > div {
  background: rgba(255,255,255,.88);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: 0 10px 30px rgba(8,40,83,.06);
}
.card { margin: 1rem 0; overflow: hidden; }
.card h2 { margin: 0 0 .4rem; }
.card > h2, .card > p, .card-head { padding: 1.2rem 1.4rem; }
.card > p { padding-top: 0; color: var(--muted); }
.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  background: #f6faff;
}
.card-head p { margin: .2rem 0 0; color: var(--muted); }
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(10rem, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}
.stats > div { padding: 1rem 1.2rem; }
.stats span { display: block; color: var(--muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .06em; }
.stats strong { display: block; margin-top: .35rem; font-size: 1.55rem; }
.table-wrap { overflow: auto; padding: 0 1.4rem 1.4rem; }
table { width: 100%; border-collapse: collapse; min-width: 980px; }
th, td { padding: .75rem .7rem; border-bottom: 1px solid #e8eef6; text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; background: #f7fbff; }
.events-table { min-width: 1240px; table-layout: fixed; }
.events-table .event-col-time { width: 5.4rem; }
.events-table .event-col-type { width: 5rem; }
.events-table .event-col-dev { width: 12rem; }
.events-table .event-col-gateway { width: 13rem; }
.events-table .event-col-reason { width: 12rem; }
.events-table .event-col-action { width: 8.5rem; }
.events-table .event-col-fcnt { width: 4.5rem; }
.events-table .event-col-rssi { width: 4.5rem; }
.events-table .event-col-normalized { width: 34rem; }
.events-table .action-cell { white-space: nowrap; }
.events-table .event-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 6.7rem;
  white-space: nowrap;
}
.events-table .json-cell pre {
  max-height: none;
  overflow: visible;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.events-table .payload-cell {
  overflow-wrap: anywhere;
  font-size: .82rem;
}
small { color: var(--muted); }
.mono { font-family: "Cascadia Mono", "Consolas", monospace; font-size: .9em; }
.cut { max-width: 26rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.empty { color: var(--muted); text-align: center; }
.actions { display: flex; gap: .45rem; align-items: center; flex-wrap: wrap; }
.chart-wrap { padding: 0 1.4rem 1.4rem; }
.reading-chart {
  display: block;
  width: 100%;
  min-height: 18rem;
  border: 1px solid #e3edf8;
  border-radius: .9rem;
  background: #fbfdff;
}
.chart-grid { stroke: #e3edf8; stroke-width: 1; }
.chart-axis { stroke: #b8cbe2; stroke-width: 1.2; }
.chart-line { fill: none; stroke: var(--blue); stroke-width: 4; stroke-linejoin: round; stroke-linecap: round; }
.chart-dot { fill: var(--blue); stroke: white; stroke-width: 2; }
.chart-label { fill: var(--muted); font-size: 13px; font-family: "Cascadia Mono", "Consolas", monospace; }
.pill { display: inline-block; padding: .22rem .55rem; border-radius: 999px; font-size: .78rem; font-weight: 700; margin: .1rem; }
.pill.ok { background: #e7f7ef; color: var(--green); }
.pill.warn { background: #fff4d9; color: var(--warn); }
.pill.muted { background: #eef2f6; color: var(--muted); }
.form { padding: 1.4rem; }
.form.grid { display: grid; grid-template-columns: repeat(2, minmax(16rem, 1fr)); gap: 1rem; }
label { font-weight: 700; display: grid; gap: .35rem; }
input, select {
  width: 100%;
  padding: .8rem .9rem;
  border: 1px solid var(--line);
  border-radius: .7rem;
  font: inherit;
  background: white;
}
.check { display: flex; align-items: center; gap: .5rem; }
.check input { width: auto; }
.form-actions { grid-column: 1 / -1; display: flex; gap: .7rem; }
.login-card { max-width: 28rem; margin: 3rem auto; }
.inline-form, .gateway-form { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.gateway-form input[type=text], .gateway-form input:not([type]) { min-width: 12rem; }
.danger-zone { padding-bottom: 1.2rem; }
.danger-zone h2, .danger-zone p, .danger-zone form { margin-left: 1.4rem; margin-right: 1.4rem; }
.flash { margin: 1rem 0; padding: .8rem 1rem; border-radius: .75rem; border: 1px solid var(--line); background: white; }
.flash.ok { border-color: #b8e4cb; color: var(--green); }
.flash.error { border-color: #f0b9b9; color: var(--red); }
pre {
  margin: 0;
  white-space: pre-wrap;
  max-height: 14rem;
  overflow: auto;
  font-size: .78rem;
}
@media (max-width: 900px) {
  .topbar, .card-head { align-items: flex-start; flex-direction: column; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .form.grid { grid-template-columns: 1fr; }
  .page { padding: 0 1rem 1rem; }
}