:root {
  --bg: #1a2332;
  --bg-elevated: #222d40;
  --bg-rail: #151c28;
  --border: #2c3a50;
  --text: #e6eef5;
  --muted: #8b9bb0;
  --accent: #f5a524;
  --accent-dim: rgba(245, 165, 36, 0.18);
  --online: #3ecf8e;
  --danger: #e85d4c;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --radius: 6px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 100vh;
}

.rail {
  background: var(--bg-rail);
  border-right: 1px solid var(--border);
  padding: 28px 16px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.brand {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
}

.brand span {
  color: var(--accent);
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav a {
  color: var(--muted);
  padding: 10px 12px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 500;
}

.nav a:hover {
  background: var(--bg-elevated);
  color: var(--text);
  text-decoration: none;
}

.nav a.active {
  background: var(--accent-dim);
  color: var(--accent);
}

.main {
  padding: 28px 32px 40px;
  max-width: 1200px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 24px;
  gap: 16px;
}

.topbar h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
}

.meta {
  color: var(--muted);
  font-size: 12px;
  font-family: var(--mono);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.metric {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.metric .label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.metric .value {
  font-size: 28px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.metric .value.accent {
  color: var(--accent);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 12px;
  margin-bottom: 12px;
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.online-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.online-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 8px;
  background: var(--muted);
}

.dot.on {
  background: var(--online);
}

.dot.off {
  background: #4a5568;
}

.dot.warn {
  background: var(--danger);
}

table.data {
  width: 100%;
  border-collapse: collapse;
}

table.data th,
table.data td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}

table.data th {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

table.data tr:last-child td {
  border-bottom: none;
}

.bar {
  height: 6px;
  background: #2a3648;
  border-radius: 3px;
  overflow: hidden;
  min-width: 80px;
}

.bar > i {
  display: block;
  height: 100%;
  background: var(--accent);
  width: 0%;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  padding: 8px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  font: inherit;
  font-weight: 500;
}

.btn:hover {
  border-color: var(--muted);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a2332;
}

.btn.danger {
  border-color: var(--danger);
  color: var(--danger);
}

.btn.sm {
  padding: 4px 10px;
  font-size: 12px;
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: end;
  margin-bottom: 16px;
}

label.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
}

input,
select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: var(--radius);
  font: inherit;
  min-width: 140px;
}

input:focus,
select:focus {
  outline: 1px solid var(--accent);
  border-color: var(--accent);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  background: var(--bg);
  color: var(--muted);
  border: 1px solid var(--border);
}

.badge.on {
  color: var(--online);
  border-color: rgba(62, 207, 142, 0.35);
}

.badge.off {
  color: var(--danger);
  border-color: rgba(232, 93, 76, 0.35);
}

.error-banner {
  background: rgba(232, 93, 76, 0.12);
  border: 1px solid rgba(232, 93, 76, 0.35);
  color: #ffb4ab;
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 13px;
}

.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(245, 165, 36, 0.08), transparent 50%),
    var(--bg);
}

.login-card {
  width: min(360px, 92vw);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.login-card h1 {
  margin: 0 0 6px;
  font-size: 22px;
}

.login-card p {
  margin: 0 0 20px;
  color: var(--muted);
}

.login-card .field {
  margin-bottom: 12px;
  width: 100%;
}

.login-card input {
  width: 100%;
}

.login-card .btn {
  width: 100%;
  margin-top: 8px;
}

.muted {
  color: var(--muted);
}

.chart-wrap {
  position: relative;
  height: 220px;
}

@media (max-width: 960px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .rail {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .metrics,
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }

  .main {
    padding: 20px 16px 32px;
  }
}

@media (max-width: 560px) {
  .metrics,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}