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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.dashboard {
  width: 100%;
  max-width: 800px;
  padding: 40px 20px;
}

.header {
  text-align: center;
  margin-bottom: 48px;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
}

.update-time {
  font-size: 0.85rem;
  color: #64748b;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 16px;
  padding: 28px 24px;
  text-align: center;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.card:hover {
  border-color: #475569;
}

.card-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #94a3b8;
  margin-bottom: 12px;
}

.card-value {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.card.status-up {
  border-color: #22c55e;
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.1);
}

.card.status-up .card-value {
  color: #4ade80;
}

.card.status-down {
  border-color: #ef4444;
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.1);
}

.card.status-down .card-value {
  color: #f87171;
}

.card.response .card-value {
  color: #38bdf8;
}

.card.requests .card-value {
  color: #c084fc;
}

.pulse-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 36px;
}

.pulse {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse 2s ease-in-out infinite;
}

.pulse.offline {
  background: #ef4444;
}

.pulse-label {
  font-size: 0.85rem;
  color: #64748b;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

@media (max-width: 640px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .card-value {
    font-size: 1.5rem;
  }
}