:root {
  --bg: #f5f5f3;
  --text: #1f2328;
  --muted: rgba(31, 35, 40, 0.62);
  --edge: rgba(76, 106, 146, 0.24);
  --accent: #4c6a92;
  --accent-soft: rgba(76, 106, 146, 0.12);
  --card-bg: rgba(255, 255, 255, 0.84);
  --card-border: rgba(31, 35, 40, 0.1);
}

html,
body {
  min-height: 100%;
}

html {
  overflow-x: hidden;
  overflow-y: auto;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(76, 106, 146, 0.08), transparent 24%),
    radial-gradient(circle at 100% 14%, rgba(130, 147, 173, 0.1), transparent 20%),
    var(--bg);
  color: var(--text);
  font: 16px/1.65 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px 96px;
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 18px;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 4px;
  box-shadow: 0 10px 32px rgba(31, 35, 40, 0.12);
}

h1,
h2,
h3 {
  color: var(--accent);
  margin: 28px 0 10px;
  line-height: 1.25;
}

h1 {
  font-size: 2.25rem;
}

h2 {
  font-size: 1.35rem;
}

h3 {
  font-size: 1.05rem;
  color: var(--muted);
}

p,
li {
  color: var(--text);
  margin: 0 0 14px;
}

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

a:hover {
  text-decoration: underline;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0;
  padding: 20px 22px;
  box-shadow: 0 14px 34px rgba(31, 35, 40, 0.1);
}

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

.pill {
  display: inline-block;
  border: 1px solid var(--card-border);
  border-radius: 0;
  padding: 6px 12px;
  font-size: .85rem;
  color: var(--muted);
  background: var(--card-bg);
}

.toc a {
  display: block;
  padding: 8px 0;
}

.hr {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--edge), transparent);
  margin: 30px 0;
}

.notice {
  border-left: 3px solid var(--accent);
  padding: 12px 14px;
  background: var(--accent-soft);
  border-radius: 0;
}

.footer {
  margin-top: 48px;
  color: var(--muted);
  font-size: .9rem;
}

.back {
  display: inline-block;
  margin-top: 22px;
  border: 1px solid var(--card-border);
  border-radius: 0;
  padding: 10px 18px;
  background: var(--card-bg);
}