:root {
  --ink: #1d2630;
  --muted: #5b6672;
  --paper: #e8edf2;
  --paper-deep: #dce3ea;
  --line: #c5ced6;
  --accent: #1f6b54;
  --accent-soft: #d5ebe3;
  --surface: #f4f7f9;
  --sidebar: #d5dce4;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: system-ui, sans-serif;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

.wrap {
  display: grid;
  grid-template-columns: minmax(0, 14rem) minmax(0, 48rem);
  gap: 2rem;
  max-width: 64rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

.mast {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: inherit;
  text-decoration: none;
}

.brand img {
  width: 2rem;
  height: 2rem;
}

.brand strong {
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 400;
}

.mast-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.lang {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.open-app {
  padding: 0.3rem 0.75rem;
  border-radius: 0.25rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.open-app:hover {
  color: #fff;
  filter: brightness(1.08);
}

.lang a {
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 0.25rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--surface);
}

.lang a[aria-current="page"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.toc {
  position: sticky;
  top: 1rem;
  align-self: start;
  padding: 0.75rem 0;
}

.toc h2 {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

.toc ol {
  margin: 0;
  padding: 0 0 0 1.1rem;
  font-size: 0.9rem;
}

.toc li {
  margin: 0.35rem 0;
}

.toc a {
  color: var(--sidebar-text, #2a3440);
  text-decoration: none;
}

.toc a:hover {
  color: var(--accent);
  text-decoration: underline;
}

main h1 {
  margin: 0 0 0.5rem;
  font-size: 1.85rem;
  line-height: 1.2;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.note {
  margin: 0 0 1.5rem;
  padding: 0.75rem 1rem;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
}

.note p {
  margin: 0;
}

.highlights {
  margin: 0 0 1.5rem;
  padding: 1rem 1.15rem;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 0.35rem;
}

.highlights h2 {
  margin: 0 0 0.5rem;
  padding: 0;
  border: 0;
  font-size: 1.05rem;
}

.highlights ul {
  margin: 0;
}

.highlights li strong {
  color: var(--accent);
}

.cards a.featured {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: 0.75rem;
  margin: 0 0 2rem;
}

.cards a {
  display: block;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  text-decoration: none;
  color: inherit;
}

.cards a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.cards strong {
  display: block;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.cards span {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
}

h1,
h2 {
  scroll-margin-top: 0.75rem;
}

h2 {
  margin: 2.25rem 0 0.75rem;
  padding-top: 0.5rem;
  font-size: 1.35rem;
  border-top: 1px solid var(--line);
}

h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
}

p,
li {
  max-width: 42rem;
}

ul, ol {
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.35rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: var(--surface);
  margin: 0.75rem 0 1.25rem;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line);
}

th {
  background: var(--sidebar);
  font-weight: 600;
}

tr:nth-child(even) td {
  background: var(--paper-deep);
}

code,
kbd {
  font-family: ui-monospace, monospace;
  font-size: 0.88em;
  background: var(--paper-deep);
  padding: 0.05em 0.3em;
  border-radius: 0.2rem;
}

pre {
  overflow: auto;
  padding: 0.85rem 1rem;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.82rem;
  line-height: 1.45;
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.foot {
  grid-column: 1 / -1;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

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

@media (max-width: 52rem) {
  .wrap {
    grid-template-columns: 1fr;
    padding: 1rem 1rem 3rem;
  }

  .toc {
    position: static;
  }

  .toc ol {
    columns: 2;
  }
}

@media print {
  .toc,
  .lang,
  .open-app {
    display: none;
  }

  .wrap {
    display: block;
    max-width: none;
  }

  a {
    color: inherit;
  }

  pre {
    background: #fff;
    color: #000;
    border: 1px solid #ccc;
  }
}