:root {
  color-scheme: dark;
  --background: #0a0d12;
  --surface: #121722;
  --surface-soft: #191f2c;
  --text: #f5f7fb;
  --muted: #aab3c2;
  --accent: #7c9cff;
  --border: #293142;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

html {
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.6;
  background: var(--background);
  color: var(--text);
}

body {
  margin: 0;
}

a {
  color: var(--accent);
}

header,
main,
footer {
  width: min(calc(100% - 40px), var(--max-width));
  margin-inline: auto;
}

header {
  padding: 48px 0 24px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

nav a {
  color: var(--muted);
  text-decoration: none;
}

nav a:first-child {
  margin-right: auto;
  color: var(--text);
  font-weight: 750;
  letter-spacing: 0.02em;
}

main {
  padding: 40px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background:
    radial-gradient(circle at top right, rgba(124, 156, 255, 0.12), transparent 35%),
    var(--surface);
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 8vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

h2 {
  margin-top: 36px;
  font-size: 1.2rem;
}

p,
li {
  color: var(--muted);
}

pre {
  overflow-x: auto;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--background);
}

code,
kbd {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

kbd {
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--surface-soft);
  color: var(--text);
}

.lead {
  max-width: 620px;
  font-size: 1.15rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-block;
  padding: 11px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  background: var(--surface-soft);
  font-weight: 650;
  text-decoration: none;
}

.button.primary {
  color: #071022;
  background: var(--accent);
  border-color: var(--accent);
}

.notice {
  margin: 28px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  border-radius: 4px 12px 12px 4px;
  background: var(--surface-soft);
  color: var(--muted);
}

footer {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 24px 0 48px;
  color: var(--muted);
  font-size: 0.9rem;
}

footer span {
  margin-right: auto;
}

@media (max-width: 600px) {
  header {
    padding-top: 28px;
  }

  nav a:first-child {
    width: 100%;
  }

  main {
    padding: 28px 22px;
    border-radius: 18px;
  }
}