*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: #020617;
  color: #f8fafc;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.heatmap-dashboard {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: 20px;
  padding: 40px;
  width: 100%;
  max-width: 900px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.dashboard-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 20px;
}

.dashboard-head h2 {
  margin: 0 0 8px 0;
  font-size: 1.75rem;
}

.dashboard-head p {
  color: #94a3b8;
  margin: 0;
}

.status-legend {
  display: flex;
  gap: 16px;
  background: #1e293b;
  padding: 10px 16px;
  border-radius: 12px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #cbd5e1;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.green { background: #10b981; box-shadow: 0 0 8px #10b981; }
.dot.yellow { background: #f59e0b; box-shadow: 0 0 8px #f59e0b; }
.dot.red { background: #ef4444; box-shadow: 0 0 8px #ef4444; }

.node-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: #020617;
  padding: 20px;
  border-radius: 12px;
  border: 1px solid #1e293b;
}

.server-node {
  width: calc(10% - 7.2px); /* 10 columns */
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  background: #10b981;
  transition: background 0.5s ease, box-shadow 0.5s ease;
  cursor: crosshair;
}

.server-node:hover {
  transform: scale(1.2);
  z-index: 10;
}

.status-ok {
  background: #10b981;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.status-warn {
  background: #f59e0b;
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.6);
  animation: pulse-warn 2s infinite alternate;
}

.status-error {
  background: #ef4444;
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.8);
  animation: pulse-error 1s infinite alternate;
}

@keyframes pulse-warn {
  to { opacity: 0.6; }
}

@keyframes pulse-error {
  to { opacity: 0.4; }
}

const grid = document.getElementById("node-grid");
const nodes = new Array();
const totalNodes = 100;

/* Build the grid */
for (let i = 0; i < totalNodes; i++) {
  const node = document.createElement("div");
  node.className = "server-node status-ok";
  grid.appendChild(node);
  nodes.push(node);
}

/* Simulate live server health updates securely */
function simulateTraffic() {
  nodes.forEach(function(node) {
    /* Random chance to alter state */
    const chance = Math.random();
    
    if (chance > 0.98) {
      node.className = "server-node status-error";
    } else if (chance > 0.92) {
      node.className = "server-node status-warn";
    } else if (chance > 0.85) {
      /* Return to normal */
      node.className = "server-node status-ok";
    }
  });
}

/* Update very frequently to look realistic */
setInterval(simulateTraffic, 800);