:root {
  color-scheme: light dark;
  --bg: #0b1020;
  --fg: #e9ecf1;
  --muted: rgba(233, 236, 241, 0.72);
  --card: rgba(255, 255, 255, 0.06);
  --stroke: rgba(255, 255, 255, 0.12);
  --accent: #7c5cff;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --fg: #12131a;
    --muted: rgba(18, 19, 26, 0.72);
    --card: rgba(255, 255, 255, 0.9);
    --stroke: rgba(18, 19, 26, 0.12);
    --accent: #5a38ff;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji";
  background: radial-gradient(1200px 900px at 20% 10%, rgba(124, 92, 255, 0.22), transparent 55%),
    radial-gradient(900px 700px at 80% 30%, rgba(0, 188, 212, 0.12), transparent 60%),
    var(--bg);
  color: var(--fg);
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 56px 20px;
}

.header h1 {
  margin: 14px 0 8px;
  letter-spacing: -0.02em;
  font-size: clamp(2.2rem, 3.5vw, 3.2rem);
}

.sub {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 1.05rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: var(--card);
  font-weight: 600;
  font-size: 0.9rem;
}

.badge::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.18);
}

.card {
  margin-top: 28px;
  padding: 18px 18px;
  border: 1px solid var(--stroke);
  border-radius: 16px;
  background: var(--card);
  backdrop-filter: blur(8px);
}

.card h2 {
  margin: 6px 0 10px;
  font-size: 1.2rem;
}

ol {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.7;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
  padding: 0 0.25em;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.12);
}

.footer {
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.95rem;
}