:root {
  --bg: #0b132b;
  --bg-2: #1c2541;
  --bg-3: #3a506b;
  --text: #e0f2ff;
  --muted: #a8b2c1;
  --accent: #21d4fd;     /* cyan */
  --accent-2: #b721ff;   /* violet */
  --ok: #29f0b4;
  --warn: #ffba0a;
  --bad: #ff5a79;
  --card: rgba(24, 33, 54, 0.75);
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 8px 30px rgba(0,0,0,0.35);
}

html, body {
  height: 100%;
  background: linear-gradient(135deg, var(--bg) 0%, var(--bg-2) 60%, var(--bg-3) 100%);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px;
}

/* Glass cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  padding: 16px;
  margin: 16px 0;
}

.card h2, .card h3 {
  margin-top: 0;
  letter-spacing: 0.4px;
}

/* Metric tiles */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 12px;
}
.metric {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}
.metric .label { color: var(--muted); font-size: 12px; }
.metric .value { font-size: 28px; font-weight: 700; margin-top: 6px; }

/* Teach-The-Engine grid */
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(240px, 1fr));
  gap: 12px;
}
.grid .tile {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: rgba(255,255,255,0.04);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
}
thead th {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-weight: 600;
}
tbody td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.mono { font-family: ui-monospace, Menlo, Consolas, monospace; }
.small { font-size: 12px; color: var(--muted); }

/* Buttons */
.button {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(33,212,253,0.15), rgba(183,33,255,0.15));
  color: var(--text);
}
.button:hover { filter: brightness(1.2); }

/* Top title glow */
.title {
  font-weight: 800;
  font-size: 42px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 16px rgba(33,212,253,0.3), 0 0 28px rgba(183,33,255,0.25);
}

/* Mobile */
@media (max-width: 840px) {
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .grid { grid-template-columns: 1fr; }
}