:root {
  color-scheme: dark;
  --bg: #121418;
  --panel: #1a1e27;
  --line: #2a3140;
  --text: #e7ebf2;
  --muted: #9aa3b5;
  --accent: #7aa2f7;
  --font: "Segoe UI", "Yu Gothic UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 600px at 10% -10%, #1d2740 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #243028 0%, transparent 45%),
    var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(720px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a {
  color: inherit;
}

.nav a[aria-current="page"] {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.brand {
  margin: 0 0 0.4rem;
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.tagline {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 1.1rem;
}

.lead {
  margin: 0 0 1.5rem;
  max-width: 36em;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
}

.btn:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.btn-primary {
  background: #2a3a5c;
  border-color: #3d5a8c;
}

h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.35rem;
}

.list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.list li {
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
}

.list strong {
  display: block;
  margin-bottom: 0.2rem;
}

.list span {
  color: var(--muted);
}

.shortcut-list {
  margin: 0;
}

.shortcut-list div {
  display: grid;
  grid-template-columns: minmax(10rem, 14rem) 1fr;
  gap: 0.75rem 1rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.shortcut-list dt {
  margin: 0;
  font-family: Consolas, "Cascadia Mono", monospace;
  font-size: 0.92rem;
}

.shortcut-list dd {
  margin: 0;
  color: var(--muted);
}

.lang {
  margin-top: 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 560px) {
  .shortcut-list div {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}