:root {
  --bg: #0b1220;
  --panel: #111a2e;
  --panel-2: #162036;
  --border: #24314d;
  --text: #e8eefc;
  --muted: #8fa0bf;
  --green: #22c55e;
  --green-dim: rgba(34, 197, 94, 0.15);
  --red: #ef4444;
  --red-dim: rgba(239, 68, 68, 0.15);
  --amber: #f59e0b;
  --blue: #3b82f6;
  --cyan: #06b6d4;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  background: radial-gradient(circle at top right, #13203a, var(--bg) 45%);
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: rgba(8, 12, 22, 0.95);
  border-right: 1px solid var(--border);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.brand {
  display: flex;
  gap: 0.85rem;
  align-items: center;
}
.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 700;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}
.brand strong { display: block; font-size: 0.95rem; }
.brand span { color: var(--muted); font-size: 0.78rem; }

.target-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.nav-item {
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  text-align: left;
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.15s ease;
}
.nav-item:hover, .nav-item.active {
  background: var(--panel);
  border-color: var(--border);
}
.nav-item small {
  display: block;
  color: var(--muted);
  margin-top: 0.15rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
}

.sidebar-meta {
  margin-top: auto;
  display: grid;
  gap: 0.65rem;
  font-size: 0.82rem;
}
.sidebar-meta div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
}
.sidebar-meta strong { color: var(--text); font-family: "IBM Plex Mono", monospace; }
.sidebar-note {
  margin-top: 0.5rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.45;
}

.main { padding: 1.25rem 1.5rem 2rem; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.topbar h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 1.85rem);
}
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.range-select {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--muted);
}
.range-select select,
.btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.75rem;
  font: inherit;
}
.btn { cursor: pointer; }
.btn:hover { border-color: var(--blue); }
.last-updated {
  color: var(--muted);
  font-size: 0.78rem;
  font-family: "IBM Plex Mono", monospace;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
.kpi-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}
.kpi-card span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  margin-bottom: 0.35rem;
}
.kpi-card strong {
  font-size: 1.6rem;
  font-family: "IBM Plex Mono", monospace;
}
.kpi-card.up strong { color: var(--green); }
.kpi-card.down strong { color: var(--red); }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.1rem 1.2rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}
.panel-head h2 {
  margin: 0;
  font-size: 1rem;
}
.muted { color: var(--muted); font-size: 0.82rem; }

.overview-table-wrap { overflow-x: auto; }
.overview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.overview-table th,
.overview-table td {
  padding: 0.75rem 0.65rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
.overview-table th {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.overview-table td.mono {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.status-pill.up { background: var(--green-dim); color: var(--green); }
.status-pill.down { background: var(--red-dim); color: var(--red); }
.status-pill.unknown { background: rgba(148, 163, 184, 0.15); color: var(--muted); }
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.chart-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: var(--shadow);
}
.chart-card h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}
.chart-card .sub {
  color: var(--muted);
  font-size: 0.78rem;
  margin-bottom: 0.75rem;
  font-family: "IBM Plex Mono", monospace;
}
.chart-wrap { position: relative; height: 240px; }

.events-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.event-card {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.85rem;
}
.event-card h4 { margin: 0 0 0.5rem; font-size: 0.9rem; }
.event-list {
  max-height: 180px;
  overflow: auto;
  font-size: 0.78rem;
}
.event-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-bottom: 1px dashed rgba(255,255,255,0.06);
  font-family: "IBM Plex Mono", monospace;
}
.event-row span:last-child { color: var(--red); }

@media (max-width: 1200px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .charts-grid, .events-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .main { padding: 1rem; }
  .topbar { flex-direction: column; }
  .kpi-grid { grid-template-columns: 1fr; }
}