:root {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: #161b22;
  --line: #30363d;
  --field: #010409;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #e6edf3;
  --accent-strong: #ffffff;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 13px/1.5 system-ui, "Segoe UI", sans-serif;
}

.wrap {
  max-width: 620px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
}

.back {
  color: var(--muted);
  text-decoration: none;
}

.back::before {
  content: "\2190\00a0";
}

.back:hover {
  color: var(--text);
}

.lang {
  display: flex;
  align-items: center;
  gap: 4px;
}

.lang__btn {
  appearance: none;
  background: none;
  border: 0;
  border-radius: 6px;
  padding: 4px 7px;
  font: inherit;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  cursor: pointer;
}

.lang__btn[aria-pressed="true"] {
  color: var(--accent-strong);
  font-weight: 600;
}

.lang__sep {
  color: var(--line);
  font-size: 12px;
}

.head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 0 20px;
}

.head__icon {
  flex: none;
  border-radius: 12px;
}

h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent-strong);
}

.head__tag {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12px;
}

section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 12px;
}

h2 {
  margin: 0 0 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

p {
  margin: 0 0 10px;
}

p:last-child {
  margin-bottom: 0;
}

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

.rules li {
  padding: 5px 0;
  border-top: 1px solid var(--line);
}

.rules li:first-child {
  border-top: 0;
}

code {
  font-family: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
  font-size: 11.5px;
  color: var(--accent-strong);
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
}

.install {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--bg);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 7px 16px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.btn--ghost {
  background: none;
  color: var(--text);
}

.btn:hover {
  border-color: var(--accent-strong);
}

.btn:focus-visible,
.back:focus-visible,
.lang__btn:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 2px;
}