:root {
  --bg: #0f1116;
  --card: #181b23;
  --accent: #7c5cff;
  --accent-2: #34d399;
  --text: #e6e8ee;
  --muted: #9aa0ad;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #1e2230, var(--bg));
  color: var(--text);
  padding: 2rem;
}

.card {
  background: var(--card);
  border: 1px solid #262a35;
  border-radius: 20px;
  max-width: 640px;
  width: 100%;
  padding: 2.5rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.robot { font-size: 3.5rem; text-align: center; }

h1 {
  text-align: center;
  margin: 0.4rem 0 0.2rem;
  font-size: 1.7rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tag { text-align: center; color: var(--muted); margin-top: 0; }

h2 {
  font-size: 1.05rem;
  margin: 1.6rem 0 0.6rem;
  color: var(--accent-2);
}

ul, ol { margin: 0; padding-left: 1.2rem; line-height: 1.7; }
li { color: var(--text); }

code {
  background: #0d0f14;
  border: 1px solid #262a35;
  border-radius: 6px;
  padding: 0.1rem 0.4rem;
  font-size: 0.85em;
  color: var(--accent-2);
}

.footnote {
  margin-top: 1.8rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}