:root {
  color-scheme: light;
  --bg: #f7faff;
  --surface: #ffffff;
  --surface-2: #f0f6ff;
  --surface-3: #e8f1ff;
  --text: #14213d;
  --text-strong: #08183b;
  --muted: #60708f;
  --faint: #8c9ab4;
  --line: #dce6f4;
  --line-strong: #c4d5ec;
  --primary: #1768e8;
  --primary-2: #4c8fff;
  --primary-soft: #e8f1ff;
  --cyan: #2bc5df;
  --gold: #e7a83b;
  --success: #1f9f72;
  --warning-bg: #fff7e8;
  --warning-line: #edc86e;
  --shadow: 0 18px 55px rgba(40, 91, 157, 0.12);
  --sidebar: 272px;
  --toc: 220px;
  --top: 72px;
  --content: 760px;
  --ease: cubic-bezier(.16, 1, .3, 1);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1220;
  --surface: #111b2d;
  --surface-2: #16233a;
  --surface-3: #1b2b47;
  --text: #dce7f8;
  --text-strong: #f7faff;
  --muted: #98a9c4;
  --faint: #7385a4;
  --line: #253651;
  --line-strong: #344b70;
  --primary: #62a0ff;
  --primary-2: #78c5ff;
  --primary-soft: #162d50;
  --cyan: #5bdbed;
  --gold: #f2c062;
  --success: #67d7ae;
  --warning-bg: #322a1b;
  --warning-line: #8a6d31;
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--top) + 28px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", "IBM Plex Sans", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: var(--top) 0 auto var(--sidebar);
  height: 360px;
  pointer-events: none;
  background: radial-gradient(circle at 52% -40%, rgba(66, 144, 255, .16), transparent 66%);
  z-index: -1;
}
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 10px; left: 12px; transform: translateY(-160%); z-index: 1000; padding: 10px 14px; border-radius: 9px; background: var(--text-strong); color: var(--surface); font-weight: 700; text-decoration: none; transition: transform .2s; }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 68%, transparent); outline-offset: 3px; }

.topbar {
  height: var(--top);
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: grid;
  grid-template-columns: var(--sidebar) minmax(280px, 640px) 1fr;
  align-items: center;
  padding: 0 26px;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 86%, transparent);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; width: max-content; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; filter: drop-shadow(0 8px 14px rgba(23, 104, 232, .24)); }
.brand-mark svg { width: 38px; height: 38px; stroke: none; }
.brand-mark svg path:first-child { fill: url(#none); fill: #1768e8; }
.brand-mark svg path:last-child { fill: #fff; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.15; }
.brand-copy b { color: var(--text-strong); font-size: 16px; letter-spacing: -.01em; }
.brand-copy b i { font-style: normal; font-family: "IBM Plex Sans", sans-serif; font-size: 12px; letter-spacing: .08em; color: var(--primary); }
.brand-copy small { font-size: 11px; margin-top: 3px; color: var(--muted); }
.search-trigger {
  justify-self: start;
  width: min(100%, 560px);
  height: 42px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-2);
  color: var(--muted);
  cursor: pointer;
  transition: border-color .2s, background .2s, box-shadow .2s;
}
.search-trigger:hover { border-color: var(--line-strong); background: var(--surface); box-shadow: 0 8px 28px rgba(38, 84, 145, .09); }
.search-trigger svg { width: 19px; }
.search-trigger span { flex: 1; text-align: left; }
kbd { border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 6px; background: var(--surface); padding: 1px 7px; color: var(--faint); font-size: 12px; }
.top-actions { justify-self: end; display: flex; align-items: center; gap: 7px; }
.icon-button, .lang-button { height: 42px; min-width: 42px; border: 1px solid transparent; border-radius: 10px; background: transparent; color: var(--muted); cursor: pointer; transition: color .2s, background .2s, border-color .2s; }
.icon-button:hover, .lang-button:hover { background: var(--surface-2); border-color: var(--line); color: var(--text-strong); }
.icon-button svg { width: 21px; height: 21px; }
.lang-button { display: flex; align-items: center; gap: 7px; padding: 0 10px; font-size: 12px; font-weight: 700; }
.lang-button i { width: 1px; height: 13px; background: var(--line-strong); }
.lang-button span:first-child { color: var(--primary); }
.moon { display: none; }
html[data-theme="dark"] .sun { display: none; }
html[data-theme="dark"] .moon { display: inline; }
.mobile-only { display: none; }

.body-grid { display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr) var(--toc); padding-top: var(--top); min-height: 100dvh; }
.sidebar { position: fixed; top: var(--top); bottom: 0; left: 0; width: var(--sidebar); border-right: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 90%, var(--bg)); z-index: 50; }
.sidebar-inner { height: 100%; overflow-y: auto; padding: 22px 18px; scrollbar-width: thin; }
.nav-group { margin: 0 0 22px; }
.nav-group-title { display: block; padding: 0 12px 7px; color: var(--faint); font-family: "IBM Plex Sans", sans-serif; font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.nav-link { position: relative; display: flex; align-items: center; gap: 10px; min-height: 41px; padding: 7px 11px; border-radius: 9px; color: var(--muted); font-size: 14px; font-weight: 500; text-decoration: none; transition: color .2s, background .2s; }
.nav-link .nav-number { flex: 0 0 25px; color: var(--faint); font-family: "IBM Plex Sans", sans-serif; font-size: 11px; font-variant-numeric: tabular-nums; }
.nav-link:hover { background: var(--surface-2); color: var(--text-strong); }
.nav-link.active { background: var(--primary-soft); color: var(--primary); font-weight: 700; }
.nav-link.active::before { content: ""; position: absolute; left: 0; width: 3px; height: 18px; border-radius: 4px; background: var(--primary); }
.nav-link.active .nav-number { color: var(--primary); }
.sidebar-footer { display: flex; align-items: center; gap: 8px; padding: 16px 12px 8px; border-top: 1px solid var(--line); color: var(--faint); font-size: 11px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 4px color-mix(in srgb, var(--success) 13%, transparent); }

main { grid-column: 2; min-width: 0; padding: 52px 44px 0; }
.article { width: min(100%, var(--content)); margin: 0 auto; }
.article-header { margin-bottom: 34px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--primary); font-family: "IBM Plex Sans", sans-serif; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--primary); border-radius: 2px; }
h1, h2, h3 { color: var(--text-strong); line-height: 1.25; letter-spacing: -.025em; scroll-margin-top: calc(var(--top) + 24px); }
h1 { margin: 12px 0 16px; font-size: clamp(36px, 5vw, 56px); font-weight: 800; }
.article-deck { max-width: 660px; margin: 0; color: var(--muted); font-size: clamp(17px, 2vw, 20px); line-height: 1.7; }
.update-line { display: flex; align-items: center; gap: 8px; margin-top: 18px; color: var(--faint); font-family: "IBM Plex Sans", sans-serif; font-size: 12px; }
.update-line svg { width: 15px; }
h2 { margin: 52px 0 16px; padding-top: 4px; font-size: 28px; font-weight: 750; }
h3 { margin: 31px 0 10px; font-size: 20px; }
p { margin: 0 0 18px; }
.article section > p, .article section > ul, .article section > ol { max-width: 720px; }
.article ul, .article ol { margin: 0 0 22px; padding-left: 24px; }
.article li { padding-left: 5px; margin-bottom: 7px; }
.article li::marker { color: var(--primary); font-weight: 700; }
.article strong { color: var(--text-strong); }
.article a:not(.button) { color: var(--primary); text-decoration-color: color-mix(in srgb, var(--primary) 35%, transparent); text-underline-offset: 3px; }
.hero-figure { position: relative; margin: 34px 0 42px; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; background: var(--surface-2); box-shadow: var(--shadow); }
.hero-figure::after { content: ""; position: absolute; inset: auto 0 0; height: 35%; pointer-events: none; background: linear-gradient(transparent, rgba(5, 30, 80, .24)); }
.hero-figure img, .content-figure img { display: block; width: 100%; height: auto; }
.hero-figure figcaption, .content-figure figcaption { position: relative; z-index: 1; padding: 11px 15px; background: color-mix(in srgb, var(--surface) 94%, transparent); color: var(--faint); font-size: 12px; }
.content-figure { margin: 30px 0; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: var(--surface); box-shadow: 0 12px 34px rgba(39, 85, 150, .08); }
.content-figure img { aspect-ratio: 16/9; object-fit: cover; }
.callout { position: relative; margin: 26px 0; padding: 20px 22px 20px 54px; border: 1px solid var(--line-strong); border-radius: 13px; background: var(--surface-2); }
.callout::before { content: "i"; position: absolute; left: 20px; top: 20px; display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--primary); color: white; font: 700 13px/1 "IBM Plex Sans"; }
.callout.warning { border-color: var(--warning-line); background: var(--warning-bg); }
.callout.warning::before { content: "!"; background: var(--gold); }
.callout p:last-child { margin-bottom: 0; }
.stat-grid, .feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 24px 0 30px; }
.stat, .feature-card { min-width: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); padding: 20px; box-shadow: 0 7px 22px rgba(40, 82, 140, .05); }
.stat b { display: block; color: var(--primary); font-family: "IBM Plex Sans", sans-serif; font-size: 30px; line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 13px; }
.feature-card h3 { margin: 0 0 7px; font-size: 18px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; }
.feature-card .card-index { display: block; margin-bottom: 10px; color: var(--primary); font: 700 11px/1 "IBM Plex Sans"; letter-spacing: .1em; }
.data-table-wrap { width: 100%; overflow-x: auto; margin: 24px 0 30px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.data-table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 14px; }
.data-table th, .data-table td { padding: 13px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.data-table th { background: var(--surface-2); color: var(--text-strong); font-size: 12px; letter-spacing: .02em; }
.data-table tr:last-child td { border-bottom: 0; }
.data-table td:nth-child(n+2) { font-variant-numeric: tabular-nums; }
.flow-list { list-style: none; counter-reset: flow; padding: 0 !important; margin: 26px 0 !important; }
.flow-list li { counter-increment: flow; position: relative; padding: 0 0 24px 52px; margin: 0; }
.flow-list li::before { content: counter(flow, decimal-leading-zero); position: absolute; left: 0; top: 0; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--primary-soft); color: var(--primary); font: 700 12px/1 "IBM Plex Sans"; }
.flow-list li:not(:last-child)::after { content: ""; position: absolute; left: 16px; top: 39px; bottom: 6px; width: 1px; background: var(--line-strong); }
.flow-list b { display: block; margin-bottom: 3px; }
.flow-list span { color: var(--muted); font-size: 14px; }
.token-badge { display: inline-flex; align-items: center; min-height: 26px; padding: 2px 9px; border-radius: 99px; background: var(--primary-soft); color: var(--primary); font: 700 12px/1 "IBM Plex Sans"; vertical-align: 1px; }
.token-badge.gem { background: color-mix(in srgb, var(--cyan) 13%, var(--surface)); color: color-mix(in srgb, var(--cyan) 78%, var(--text-strong)); }
.roadmap { display: grid; gap: 0; margin: 26px 0; }
.roadmap-item { position: relative; padding: 0 0 28px 60px; }
.roadmap-item::before { content: attr(data-step); position: absolute; left: 0; top: 0; display: grid; place-items: center; width: 38px; height: 38px; border: 2px solid var(--primary); border-radius: 50%; background: var(--surface); color: var(--primary); font: 700 12px/1 "IBM Plex Sans"; }
.roadmap-item:not(:last-child)::after { content: ""; position: absolute; left: 18px; top: 39px; bottom: 0; width: 2px; background: linear-gradient(var(--primary), var(--line)); }
.roadmap-item h3 { margin: 4px 0 5px; }
.roadmap-item p { margin: 0; color: var(--muted); }

.toc { grid-column: 3; }
.toc-inner { position: fixed; top: calc(var(--top) + 48px); right: 20px; width: calc(var(--toc) - 34px); max-height: calc(100vh - var(--top) - 80px); overflow-y: auto; }
.toc-inner > p { margin: 0 0 9px; color: var(--text-strong); font-size: 12px; font-weight: 700; }
.toc a { display: block; position: relative; padding: 5px 0 5px 13px; border-left: 1px solid var(--line); color: var(--faint); font-size: 12px; line-height: 1.45; text-decoration: none; transition: color .2s, border-color .2s; }
.toc a:hover, .toc a.active { color: var(--primary); border-left-color: var(--primary); }
.copy-link { display: flex; align-items: center; gap: 7px; margin-top: 20px; padding: 8px 9px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font-size: 12px; cursor: pointer; }
.copy-link:hover { background: var(--surface-2); color: var(--text-strong); }
.copy-link svg { width: 15px; }
.page-nav { width: min(100%, var(--content)); margin: 72px auto 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.page-nav a { min-height: 82px; display: flex; flex-direction: column; justify-content: center; padding: 15px 18px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); text-decoration: none; transition: transform .2s var(--ease), border-color .2s, box-shadow .2s; }
.page-nav a:hover { transform: translateY(-2px); border-color: var(--primary-2); box-shadow: 0 14px 30px rgba(40, 84, 145, .09); }
.page-nav a.next { align-items: flex-end; text-align: right; }
.page-nav small { color: var(--faint); font-size: 11px; }
.page-nav b { color: var(--text-strong); font-size: 14px; }
.site-footer { width: min(100%, var(--content)); margin: 30px auto 0; padding: 30px 0 40px; border-top: 1px solid var(--line); color: var(--faint); font-size: 11px; }
.site-footer div { display: flex; justify-content: space-between; gap: 20px; }
.site-footer b { color: var(--text-strong); }
.site-footer p { margin: 9px 0 0; }

.search-dialog { width: min(680px, calc(100% - 30px)); max-height: min(680px, calc(100dvh - 40px)); padding: 0; border: 1px solid var(--line-strong); border-radius: 18px; background: var(--surface); color: var(--text); box-shadow: 0 30px 100px rgba(7, 28, 65, .3); overflow: hidden; }
.search-dialog::backdrop { background: rgba(5, 15, 35, .55); backdrop-filter: blur(6px); }
.search-box { padding: 14px; }
.search-field { display: flex; align-items: center; gap: 10px; height: 50px; padding: 0 10px 0 13px; border: 1px solid var(--line-strong); border-radius: 12px; background: var(--surface-2); }
.search-field svg { width: 20px; color: var(--muted); }
.search-field input { flex: 1; min-width: 0; height: 100%; border: 0; outline: none; background: transparent; color: var(--text-strong); font-size: 15px; }
.search-field button { border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--faint); font-size: 11px; cursor: pointer; }
.search-results { max-height: 500px; overflow-y: auto; padding: 10px 0 0; }
.search-result { display: block; padding: 13px 14px; border-radius: 10px; text-decoration: none; }
.search-result:hover { background: var(--surface-2); }
.search-result b { display: block; color: var(--text-strong); font-size: 14px; }
.search-result span { display: block; color: var(--faint); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.empty-search { padding: 42px 20px; color: var(--faint); text-align: center; font-size: 13px; }
.toast { position: fixed; left: 50%; bottom: 28px; z-index: 400; transform: translate(-50%, 20px); opacity: 0; pointer-events: none; padding: 9px 14px; border-radius: 9px; background: var(--text-strong); color: var(--surface); font-size: 12px; transition: opacity .2s, transform .2s var(--ease); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.drawer-scrim { display: none; }

@media (max-width: 1180px) {
  :root { --sidebar: 248px; --toc: 0px; }
  .topbar { grid-template-columns: var(--sidebar) minmax(260px, 560px) 1fr; }
  .body-grid { grid-template-columns: var(--sidebar) minmax(0, 1fr); }
  .toc { display: none; }
  main { grid-column: 2; }
}

@media (max-width: 820px) {
  :root { --top: 64px; --sidebar: 282px; }
  .topbar { grid-template-columns: minmax(0, 1fr) auto auto; gap: 4px; padding: 0 16px; }
  .topbar .search-trigger { position: static; width: 42px; padding: 0; justify-content: center; }
  .search-trigger span, .search-trigger kbd { display: none; }
  .mobile-only { display: inline-grid; place-items: center; }
  .body-grid { display: block; }
  .sidebar { transform: translateX(-105%); box-shadow: 24px 0 55px rgba(5, 23, 53, .22); transition: transform .28s var(--ease); }
  .sidebar.open { transform: translateX(0); }
  .drawer-scrim { display: block; position: fixed; inset: var(--top) 0 0; z-index: 40; background: rgba(6, 16, 35, .5); opacity: 0; visibility: hidden; transition: opacity .2s, visibility .2s; }
  .drawer-scrim.open { opacity: 1; visibility: visible; }
  main { padding: 38px 22px 0; }
  body.nav-open { overflow: hidden; }
}

@media (max-width: 560px) {
  .topbar { padding: 0 12px; }
  .brand-copy small { display: none; }
  .brand-mark, .brand-mark svg { width: 34px; height: 34px; }
  .lang-button { padding: 0 7px; }
  #theme-button { display: none; }
  main { padding: 30px 17px 0; }
  h1 { font-size: 38px; }
  h2 { margin-top: 44px; font-size: 25px; }
  .article-deck { font-size: 17px; }
  .hero-figure { margin-left: -8px; margin-right: -8px; border-radius: 14px; }
  .stat-grid, .feature-grid { grid-template-columns: 1fr; }
  .page-nav { grid-template-columns: 1fr; }
  .page-nav a.next { align-items: flex-start; text-align: left; }
  .site-footer div { flex-direction: column; gap: 3px; }
  .callout { padding-left: 48px; }
  .callout::before { left: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}