:root {
  color-scheme: light;
  --ink: #202124;
  --muted: #626a73;
  --line: #d9dde3;
  --panel: #f6f7f9;
  --panel-strong: #eef1f5;
  --brand: #4f5b93;
  --brand-dark: #30375f;
  --accent: #2f7d62;
  --warning: #8a5b11;
  --code: #111827;
  --code-bg: #f0f2f5;
  --surface: #ffffff;
  --shadow: 0 1px 2px rgba(20, 28, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font: 16px/1.58 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: var(--brand);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--brand-dark);
}

.masthead {
  border-bottom: 1px solid var(--line);
  background: #f8f9fb;
}

.masthead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 16px 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid #c5cae1;
  border-radius: 7px;
  background: var(--brand);
  color: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  letter-spacing: 0;
}

.top-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 14px;
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  max-width: 1240px;
  margin: 0 auto;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: 28px 24px;
  border-right: 1px solid var(--line);
  background: #fbfbfc;
  overflow: auto;
}

.sidebar h2 {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar nav {
  display: grid;
  gap: 2px;
}

.sidebar a {
  display: block;
  padding: 7px 0;
  color: #384052;
  font-size: 14px;
  text-decoration: none;
}

.sidebar a:hover {
  color: var(--brand-dark);
}

.content {
  min-width: 0;
  padding: 32px 24px 72px;
}

.article {
  max-width: 900px;
}

.hero {
  padding: 18px 0 30px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.22;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 700;
}

h2 {
  margin: 42px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-size: 28px;
}

h3 {
  margin: 30px 0 10px;
  font-size: 21px;
}

p {
  margin: 0 0 16px;
}

.lead {
  max-width: 780px;
  color: #3a4150;
  font-size: 19px;
}

.manual-note {
  margin: 18px 0;
  padding: 14px 16px;
  border-left: 4px solid var(--brand);
  background: var(--panel);
}

.warning {
  border-left-color: var(--warning);
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 22px 0 0;
}

.quick-item {
  min-height: 112px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.quick-item strong {
  display: block;
  margin-bottom: 6px;
}

.quick-item span {
  color: var(--muted);
  font-size: 14px;
}

.synopsis {
  margin: 16px 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  overflow-x: auto;
}

pre {
  margin: 16px 0 22px;
  padding: 16px;
  border: 1px solid #d4d8df;
  border-radius: 7px;
  background: var(--code-bg);
  color: var(--code);
  overflow-x: auto;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.94em;
}

p code,
li code,
td code {
  padding: 2px 4px;
  border-radius: 4px;
  background: var(--code-bg);
}

table {
  width: 100%;
  margin: 16px 0 24px;
  border-collapse: collapse;
  font-size: 15px;
}

th,
td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--panel);
  font-weight: 700;
}

.class-entry {
  margin: 34px 0;
}

.method-list {
  display: grid;
  gap: 12px;
}

.method {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.method code {
  font-weight: 700;
}

.architecture {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0 24px;
}

.architecture div {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel);
}

.architecture strong {
  display: block;
  margin-bottom: 6px;
}

.footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.page-narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 24px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .sidebar nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 16px;
  }

  .quick-grid,
  .architecture {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .masthead-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .sidebar nav {
    grid-template-columns: 1fr;
  }

  .content {
    padding-inline: 18px;
  }
}