:root {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-alt: #273449;
  --color-border: #334155;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-primary: #0ea5e9;
  --color-primary-hover: #0284c7;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-success: #22c55e;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px 24px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

nav {
  display: flex;
  gap: 8px;
  flex: 1;
  flex-wrap: wrap;
}

nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius);
}

nav a:hover,
nav a.active {
  color: var(--color-text);
  background: var(--color-surface-alt);
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 6px 12px;
  border-radius: var(--radius);
  cursor: pointer;
}

.user-badge {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

main {
  padding: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

h1 {
  margin-top: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin: 16px 0;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.card .value {
  font-size: 1.75rem;
  font-weight: 700;
}

.actions {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  padding: 10px 18px;
  background: var(--color-surface-alt);
  color: var(--color-text);
}

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

.btn-danger {
  background: var(--color-danger);
  color: white;
}
.btn-danger:hover {
  background: var(--color-danger-hover);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

.table th,
.table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
}

.table th {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

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

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}

.badge.ok {
  background: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
}

.badge.off {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
}

.login-box {
  max-width: 360px;
  margin: 10vh auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.login-box h1 {
  text-align: center;
  color: var(--color-primary);
}

.login-box form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-box label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

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

.inline-form {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.error {
  color: var(--color-danger);
}

.hint {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}