:root {
  --bg: #0a0f0d;
  --surface: #10161400;
  --card: #0f1512;
  --border: #1e2a25;
  --fg: #e8f0ec;
  --muted: #8aa79b;
  --teal: #17b890;
  --teal-soft: rgba(23, 184, 144, 0.14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background:
    radial-gradient(60% 60% at 50% 0%, rgba(23, 184, 144, 0.10), transparent 70%),
    var(--bg);
}

.card {
  width: 100%;
  max-width: 560px;
  padding: 40px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card);
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.7);
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  background: var(--teal-soft);
}
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 0 rgba(23, 184, 144, 0.7);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(23, 184, 144, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(23, 184, 144, 0); }
  100% { box-shadow: 0 0 0 0 rgba(23, 184, 144, 0); }
}

h1 {
  margin: 20px 0 8px;
  font-size: 40px;
  letter-spacing: -0.02em;
}
.lead {
  margin: 0 auto;
  max-width: 42ch;
  color: var(--muted);
  line-height: 1.6;
}
strong { color: var(--fg); }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 28px 0;
}
.tile {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
}
.tile-k { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.tile-v { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 15px; }

.btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  color: #04140f;
  background: var(--teal);
  transition: transform 0.12s ease, opacity 0.12s ease;
}
.btn:hover { opacity: 0.92; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.out { min-height: 20px; margin: 14px 0 0; color: var(--teal); font-family: ui-monospace, monospace; font-size: 14px; }

.foot {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  font-family: ui-monospace, monospace;
}