:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --border: #e1e4e8;
  --text: #1f2937;
  --text-muted: #6b7280;
  --primary: #2f6feb;
  --primary-hover: #1f5cd1;
  --header-bg: #111827;
  --header-text: #f9fafb;
  --sidebar-bg: #ffffff;
  --sidebar-active: #eef4ff;
  --status-up: #16a34a;
  --status-degraded: #d97706;
  --status-down: #dc2626;
  --status-unknown: #9ca3af;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  background: var(--header-bg);
  color: var(--header-text);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark { color: var(--primary); font-size: 16px; }
.brand-name { font-size: 17px; font-weight: 700; letter-spacing: 0.4px; }
.brand-sub { font-size: 13px; opacity: 0.7; }

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 12px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.status-up       { background: var(--status-up); }
.status-degraded { background: var(--status-degraded); }
.status-down     { background: var(--status-down); }
.status-unknown  { background: var(--status-unknown); }

.layout {
  display: flex;
  min-height: calc(100vh - 56px);
}

.sidebar {
  flex: 0 0 220px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  text-align: left;
  background: transparent;
  border: none;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  color: var(--text);
  border-radius: 6px;
  transition: background 0.1s ease;
}

.nav-item:hover { background: #f1f3f5; }
.nav-item.active {
  background: var(--sidebar-active);
  color: var(--primary);
  font-weight: 600;
}

.main {
  flex: 1;
  padding: 24px;
  max-width: 1100px;
}

.main h1 {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 700;
}

.main .lead {
  margin: 0 0 20px;
  color: var(--text-muted);
  font-size: 13px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px;
  margin-bottom: 16px;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 600;
}

.card-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.metric {
  flex: 1 1 180px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  background: #fafbfc;
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.metric-value {
  font-size: 22px;
  font-weight: 700;
  margin-top: 4px;
}

.metric-value.up       { color: var(--status-up); }
.metric-value.degraded { color: var(--status-degraded); }
.metric-value.down     { color: var(--status-down); }

form.stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 560px;
}

form.stack label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--text-muted);
}

input[type="text"],
textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
}

textarea { resize: vertical; min-height: 80px; }

button.btn {
  padding: 8px 16px;
  font-size: 13px;
  font-family: inherit;
  border-radius: 5px;
  border: 1px solid transparent;
  cursor: pointer;
}

button.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

button.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

button.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}

button.btn-secondary:hover { background: #f1f3f5; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th, td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

th {
  background: #f6f8fa;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-muted);
}

tbody tr:nth-child(even) { background: #fafbfc; }

.empty {
  color: var(--text-muted);
  font-style: italic;
  padding: 12px 0;
}

.alert {
  padding: 10px 12px;
  border-radius: 5px;
  font-size: 13px;
  margin-bottom: 12px;
}

.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.kv {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 16px;
  font-size: 13px;
}

.kv .k { color: var(--text-muted); }
.kv .v { color: var(--text); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

@media (max-width: 720px) {
  .layout { flex-direction: column; }
  .sidebar { flex: 0 0 auto; flex-direction: row; overflow-x: auto; border-right: none; border-bottom: 1px solid var(--border); }
  .nav-item { white-space: nowrap; }
  .main { padding: 16px; }
}