:root {
  color-scheme: light;
  --bg: #edf4ff;
  --line: rgba(26, 72, 128, 0.14);
  --text: #10233c;
  --muted: #536983;
  --accent: #2f78d7;
  --accent-strong: #1e5aa8;
  --accent-soft: rgba(47, 120, 215, 0.12);
  --content-width: 1360px;
  --header-height: 0px;
  --sans: "Helvetica Neue", Helvetica, Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--sans);
  background: #ffffff;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.shell {
  width: min(calc(100% - 32px), var(--content-width));
  margin: 0 auto;
}

.site-header {
  padding: 24px 0 8px;
}

.site-header .shell,
.doc-layout,
.site-footer .shell {
  position: relative;
  z-index: 1;
}

.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 56px;
  height: 48px;
  background: linear-gradient(135deg, #4f98ee, #1e5aa8);
  color: #f7fbff;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand-copy strong,
.brand-copy span {
  display: block;
}

.brand-copy strong {
  font-size: 1rem;
}

.brand-copy span {
  color: var(--muted);
  font-size: 0.92rem;
}

.lang-tab,
.toc a {
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.lang-tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
}

.doc-layout {
  padding: 12px 0 56px;
}

.doc-card {
  background: transparent;
}

.doc-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 0 18px;
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.doc-toolbar-copy h2 {
  margin: 0;
  font-size: 1.15rem;
}

.doc-toolbar-copy p {
  margin: 6px 0 0;
  color: var(--muted);
}

.lang-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.lang-tab {
  padding: 10px 14px;
  color: var(--muted);
  cursor: pointer;
}

.lang-tab[aria-selected="true"] {
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-color: rgba(47, 120, 215, 0.32);
}

.doc-panels {
  padding: 28px 0 0;
}

.doc-panel[hidden] {
  display: none;
}

.doc-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 44px;
  align-items: start;
}

.toc {
  position: sticky;
  top: var(--header-height);
  align-self: start;
  max-height: calc(100vh - var(--header-height));
  overflow: auto;
  padding: 0 24px 0 0;
  border-right: 1px solid var(--line);
  background: transparent;
}

.toc h3 {
  margin: 0 0 12px;
  font-size: 0.96rem;
}

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

.toc li + li {
  margin-top: 8px;
}

.toc a {
  color: var(--muted);
  text-decoration: none;
  display: block;
}

.toc a:hover {
  color: var(--accent-strong);
}

.toc .depth-3 {
  padding-left: 14px;
  font-size: 0.95rem;
}

.guide {
  min-width: 0;
  padding: 0 0 24px;
  max-width: 820px;
}

.guide .doc-body > :first-child {
  margin-top: 0;
}

.guide .doc-body h1,
.guide .doc-body h2,
.guide .doc-body h3 {
  color: #10233c;
  scroll-margin-top: 24px;
}

.guide .doc-body h1 {
  margin: 0 0 18px;
  font-size: clamp(2.1rem, 4vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.guide .doc-body h2 {
  margin: 40px 0 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(26, 72, 128, 0.08);
  font-size: 1.5rem;
}

.guide .doc-body h3 {
  margin: 28px 0 12px;
  font-size: 1.1rem;
}

.guide .doc-body p,
.guide .doc-body li {
  color: #27405d;
  line-height: 1.78;
}

.guide .doc-body p {
  margin: 0 0 14px;
}

.guide .doc-body ul,
.guide .doc-body ol {
  margin: 0 0 16px;
  padding-left: 22px;
}

.guide .doc-body li + li {
  margin-top: 4px;
}

.guide .doc-body code {
  padding: 0.14em 0.4em;
  border-radius: 0.4em;
  background: rgba(83, 105, 131, 0.12);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

.guide .doc-body strong {
  color: #10233c;
}

.site-footer {
  padding: 0 0 36px;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 980px) {
  .doc-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .toc {
    position: static;
    max-height: none;
    padding: 0 0 18px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 680px) {
  .brand-row,
  .doc-toolbar {
    align-items: flex-start;
  }

  .doc-toolbar {
    padding: 0 0 16px;
  }

  .doc-panels {
    padding-top: 22px;
  }

  .brand-mark {
    width: 52px;
  }
}