:root {
  --bg-primary: #0d1117;
  --bg-card: #161b22;
  --bg-card-hover: #1c2129;
  --border-default: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --color-up: #3fb950;
  --color-down: #f85149;
  --color-degraded: #d29922;
  --color-unknown: #6e7681;
  --color-up-bg: rgba(63, 185, 80, 0.1);
  --color-down-bg: rgba(248, 81, 73, 0.1);
  --radius: 12px;
  --transition: 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border-default);
  background: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.last-updated {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.overall-status {
  padding: 0.35rem 1rem;
  border-radius: 2rem;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.overall-status.all-up {
  background: var(--color-up-bg);
  color: var(--color-up);
}

.overall-status.some-down {
  background: var(--color-down-bg);
  color: var(--color-down);
}

.overall-status.loading {
  color: var(--text-muted);
}

.btn-fullscreen {
  background: none;
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  padding: 0.5rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-fullscreen:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

/* Dashboard grid */
main {
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.5rem;
  max-width: 1920px;
  margin: 0 auto;
}

/* Group headers */
.group-header {
  grid-column: 1 / -1;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-default);
  margin-top: 0.5rem;
}

.group-header:first-child {
  margin-top: 0;
}

/* Device cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  padding: 1.5rem;
  border-left: 4px solid var(--color-unknown);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-card-hover);
}

.card.status-up {
  border-left-color: var(--color-up);
}

.card.status-down {
  border-left-color: var(--color-down);
  animation: pulse-down 2s ease-in-out infinite;
}

.card.status-unknown {
  border-left-color: var(--color-unknown);
}

@keyframes pulse-down {
  0%, 100% { box-shadow: 0 0 0 0 rgba(248, 81, 73, 0); }
  50% { box-shadow: 0 0 20px 0 rgba(248, 81, 73, 0.15); }
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
}

.card-host {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.status-badge.up {
  background: var(--color-up-bg);
  color: var(--color-up);
}

.status-badge.down {
  background: var(--color-down-bg);
  color: var(--color-down);
}

.status-badge.unknown {
  background: rgba(110, 118, 129, 0.15);
  color: var(--color-unknown);
}

/* Stats row */
.card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-value.up {
  color: var(--color-up);
}

.stat-value.down {
  color: var(--color-down);
}

.stat-value.neutral {
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.2rem;
}

/* Sparkline chart */
.sparkline-container {
  margin-bottom: 0.75rem;
}

.sparkline-container canvas {
  width: 100%;
  height: 50px;
  border-radius: 6px;
}

/* Status dots */
.status-dots {
  display: flex;
  gap: 2px;
  flex-wrap: nowrap;
  overflow: hidden;
}

.status-dot {
  width: 6px;
  height: 20px;
  border-radius: 2px;
  flex-shrink: 0;
  transition: var(--transition);
}

.status-dot.up {
  background: var(--color-up);
  opacity: 0.8;
}

.status-dot.down {
  background: var(--color-down);
  opacity: 1;
}

.status-dot.unknown {
  background: var(--color-unknown);
  opacity: 0.3;
}

.status-dot:hover {
  opacity: 1;
  transform: scaleY(1.2);
}

/* Error message */
.card-error {
  font-size: 0.75rem;
  color: var(--color-down);
  margin-top: 0.75rem;
  padding: 0.5rem;
  background: var(--color-down-bg);
  border-radius: 6px;
  word-break: break-all;
}

/* Responsive */
@media (max-width: 480px) {
  main {
    grid-template-columns: 1fr;
    padding: 1rem;
    gap: 1rem;
  }

  header {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
  }

  .card-stats {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .stat-value {
    font-size: 1.3rem;
  }
}

/* Large screen / TV mode */
@media (min-width: 1920px) {
  main {
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
  }

  h1 {
    font-size: 2rem;
  }

  .card-title {
    font-size: 1.4rem;
  }

  .stat-value {
    font-size: 2rem;
  }
}

/* Fullscreen tweaks */
:fullscreen body,
::backdrop {
  background: var(--bg-primary);
}

:fullscreen header {
  padding: 1rem 2rem;
}