:root {
  --bg: #ffffff;
  --surface: #f7f7f8;
  --text: #202227;
  --muted: #6a6f81;
  --stroke: rgba(27, 37, 75, 0.12);
  --accent: #335fff;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111216;
    --surface: #191b21;
    --text: #f7f7f8;
    --muted: #9da1b0;
    --stroke: rgba(208, 217, 251, 0.12);
    --accent: #6c8bff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: clamp(40px, 9vw, 96px) 20px 48px;
}

.mark {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent);
}

.mark svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: #fff;
  stroke-width: 1.5;
}

h1 {
  margin: 20px 0 8px;
  font-size: clamp(28px, 6vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  max-width: 54ch;
}

section {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--stroke);
}

ul, ol { margin: 0; padding: 0; }

.features { list-style: none; display: grid; gap: 12px; }
.features li { color: var(--muted); }
.features strong { color: var(--text); font-weight: 600; }

.steps { padding-left: 20px; display: grid; gap: 8px; }

code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--stroke);
  font: 13px/1.4 ui-monospace, "Cascadia Mono", Consolas, monospace;
}

.muted { margin: 0 0 12px; color: var(--muted); }

.regions {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px;
}

.regions li {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--stroke);
  font-size: 14px;
  line-height: 1.3;
}

.regions small { display: block; color: var(--muted); font-size: 12px; }

footer {
  margin-top: 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
}

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