:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --ink: #16150f;
  --ink-soft: #57544c;
  --muted: #8b877d;
  --line: #e8e6df;
  --line-strong: #d9d6cd;
  --accent: #1c6b4b;
  --accent-soft: #eef4f0;
  --code-bg: #17160f;
  --code-ink: #e9e7df;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --topbar-h: 60px;
  --sidebar-w: 268px;
  --toc-w: 220px;
}
* {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 22px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(160%) blur(8px);
}
.brand {
  font-weight: 600;
  letter-spacing: -0.02em;
  font-size: 16px;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}
.brand .mk {
  color: var(--accent);
}
.brand .tag {
  font-size: 12.5px;
  color: var(--muted);
  border-left: 1px solid var(--line-strong);
  padding-left: 10px;
  letter-spacing: 0;
  font-weight: 500;
}
.topbar .spacer {
  margin-left: auto;
}
.topbar nav {
  display: flex;
  align-items: center;
  gap: 20px;
}
.topbar nav a {
  font-size: 14px;
  color: var(--ink-soft);
  font-weight: 500;
}
.topbar nav a:hover {
  color: var(--ink);
}
.topbar .btn {
  background: var(--ink);
  color: #fff;
  padding: 8px 15px;
  border-radius: 9px;
  font-size: 13.5px;
  font-weight: 550;
}
.topbar .btn:hover {
  background: #000;
}
.menu-toggle {
  display: none;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  border-radius: 9px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  color: var(--ink);
  font-size: 18px;
}

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w);
  max-width: 1400px;
  margin: 0 auto;
}
body.no-toc .shell {
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
}
@media (max-width: 1100px) {
  .shell {
    grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  }
  .toc {
    display: none;
  }
}
@media (max-width: 820px) {
  .shell {
    grid-template-columns: 1fr;
  }
}

.sidebar {
  position: sticky;
  top: var(--topbar-h);
  align-self: start;
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  border-right: 1px solid var(--line);
  padding: 26px 18px 60px;
}
@media (max-width: 820px) {
  .sidebar {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    width: min(300px, 84vw);
    z-index: 18;
    background: var(--surface);
    height: calc(100vh - var(--topbar-h));
    transform: translateX(-102%);
    transition: transform 0.18s ease;
    box-shadow: 0 30px 60px -30px rgba(20, 18, 10, 0.4);
  }
  .sidebar.open {
    transform: none;
  }
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}
.nav-group {
  margin-bottom: 22px;
}
.nav-group-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 10px;
  margin-bottom: 6px;
}
.nav-group a {
  display: block;
  padding: 7px 10px;
  margin: 1px 0;
  border-radius: 8px;
  font-size: 14px;
  color: var(--ink-soft);
  transition:
    color 0.12s ease,
    background 0.12s ease;
}
.nav-group a:hover {
  color: var(--ink);
  background: var(--bg);
}
.nav-group a.active {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 550;
}

.content {
  padding: 40px 52px 96px;
  min-width: 0;
}
@media (max-width: 820px) {
  .content {
    padding: 32px 22px 80px;
  }
}
.breadcrumb {
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 8px;
}
.breadcrumb .mk {
  color: var(--accent);
}
.content h1 {
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 600;
  margin: 0 0 14px;
}
.content .intro {
  font-size: 18px;
  color: var(--ink-soft);
  line-height: 1.55;
  max-width: 66ch;
  margin: 0;
}
.content h2 {
  font-size: 24px;
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 44px 0 4px;
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}
.content h3 {
  font-size: 17px;
  letter-spacing: -0.015em;
  font-weight: 600;
  margin: 0;
}
.content p {
  color: var(--ink-soft);
  margin: 14px 0 0;
  max-width: 68ch;
}
.content strong {
  color: var(--ink);
  font-weight: 600;
}
code.inline {
  font: 500 13.5px var(--mono);
  background: #f4f2ec;
  color: var(--ink);
  padding: 1.5px 6px;
  border-radius: 5px;
}

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 26px;
}
@media (min-width: 640px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
}
.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  background: var(--surface);
  transition:
    border-color 0.14s ease,
    box-shadow 0.14s ease;
}
.card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 14px 34px -24px rgba(20, 18, 10, 0.4);
}
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 18px;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 16%, transparent);
}
.card h3 {
  margin: 12px 0 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.card p {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.steps {
  margin-top: 20px;
}
.step {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px dashed var(--line);
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}
.step:last-of-type {
  border-bottom: none;
}
.step-num {
  font: 600 14px / 1 var(--mono);
  color: #fff;
  background: var(--accent);
  border-radius: 8px;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.step-num.optional {
  background: var(--ink-soft);
}
.step h3 {
  margin: 4px 0 0;
}
.step p {
  margin: 6px 0 0;
}

.code {
  position: relative;
  margin-top: 16px;
  background: var(--code-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 18px 40px -30px rgba(20, 18, 10, 0.5);
}
.code .code-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px 8px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.code .lang {
  font: 500 11px / 1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #8f8b80;
}
.copy {
  font: 500 11px / 1 var(--sans);
  color: var(--code-ink);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 7px;
  padding: 6px 10px;
  cursor: pointer;
  transition: background 0.12s ease;
}
.copy:hover {
  background: rgba(255, 255, 255, 0.16);
}
.copy.copied {
  color: #a6e2c4;
  border-color: rgba(166, 226, 196, 0.4);
}
.code pre {
  margin: 0;
  padding: 15px 18px;
  overflow-x: auto;
  font: 400 13px / 1.75 var(--mono);
  color: var(--code-ink);
}

.callout {
  margin-top: 18px;
  padding: 14px 16px 14px 18px;
  border-radius: 10px;
  border: 1px solid;
  font-size: 14.5px;
  line-height: 1.55;
}
.callout.info {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 22%, transparent);
}
.callout.warn {
  background: #fbf3e9;
  border-color: #f0dcc4;
}
.callout .ctitle {
  font-weight: 600;
  display: block;
  margin-bottom: 2px;
}
.callout.info .ctitle {
  color: var(--accent);
}
.callout.warn .ctitle {
  color: #a9691b;
}

.table-wrap {
  margin-top: 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
}
thead th {
  text-align: left;
  font-weight: 600;
  color: var(--ink);
  background: var(--bg);
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  vertical-align: top;
}
tbody tr:last-child td {
  border-bottom: none;
}
tbody td code {
  font: 500 12.5px var(--mono);
  color: #b02a2a;
}

.toc {
  position: sticky;
  top: var(--topbar-h);
  align-self: start;
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 44px 20px;
}
.toc-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.toc a {
  display: block;
  padding: 5px 0 5px 12px;
  font-size: 13px;
  color: var(--muted);
  border-left: 2px solid var(--line);
}
.toc a.h3 {
  padding-left: 24px;
}
.toc a:hover {
  color: var(--ink-soft);
}
.toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.pager-row {
  margin-top: 56px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 14px;
}
.pager {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--surface);
  max-width: 48%;
}
.pager:hover {
  border-color: var(--ink);
}
.pager.next {
  text-align: right;
  align-items: flex-end;
}
.pager span {
  font-size: 12px;
  color: var(--muted);
}
.pager strong {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}

.backdrop {
  display: none;
}
@media (max-width: 820px) {
  .backdrop.show {
    display: block;
    position: fixed;
    inset: var(--topbar-h) 0 0;
    background: rgba(22, 21, 15, 0.35);
    z-index: 17;
  }
}