:root {
  --bg: #FFFFFF;
  --ink: #0D0D0F;
  --ink2: #5E5E66;
  --ink3: #6B6B73;
  --line: #ECECEF;
  --soft: #F3F3F5;
  --soft2: #E4E4E8;
  --cell: #FFFFFF;
  --acc: #3456F0;
  --acc-ink: #2340D0;
  --muted: #D6D6DC;
  --shadow: 0 0 0 1px rgba(13, 13, 15, .06), 0 10px 44px -14px rgba(13, 13, 15, .16);
  --code-bg: #0E0E11;
  --ok: #1B7A3E;
  --danger: #C0392B;
  --warn-bg: #FFF8E8;
  --warn-line: #F0DFB0;
  --warn-ink: #6B5420;
  --sans: "Figtree", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --ease: cubic-bezier(.4, 0, .2, 1);
  --hdr: 56px;
  --side: 240px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0A0A0B; --ink: #F1F1F3; --ink2: #A2A2AA; --ink3: #8E8E96;
    --line: #232327; --soft: #18181B; --soft2: #27272C; --cell: #111113;
    --acc: #8198FF; --acc-ink: #A5B5FF; --muted: #3A3A40;
    --shadow: 0 0 0 1px rgba(255, 255, 255, .08), 0 10px 44px -14px rgba(0, 0, 0, .7);
    --code-bg: #141417; --ok: #86EFAC; --danger: #FCA5A5;
    --warn-bg: #1C170C; --warn-line: #3D3220; --warn-ink: #E8D49A;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0A0A0B; --ink: #F1F1F3; --ink2: #A2A2AA; --ink3: #8E8E96;
  --line: #232327; --soft: #18181B; --soft2: #27272C; --cell: #111113;
  --acc: #8198FF; --acc-ink: #A5B5FF; --muted: #3A3A40;
  --shadow: 0 0 0 1px rgba(255, 255, 255, .08), 0 10px 44px -14px rgba(0, 0, 0, .7);
  --code-bg: #141417; --ok: #86EFAC; --danger: #FCA5A5;
  --warn-bg: #1C170C; --warn-line: #3D3220; --warn-ink: #E8D49A;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px / 1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--acc); outline-offset: 2px; }
h1, h2, h3 { margin: 0; font-weight: 500; letter-spacing: -.02em; text-wrap: balance; }
h1 { font-size: clamp(26px, 3.5vw, 34px); line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.2rem; margin: 36px 0 10px; padding-top: 8px; }
h3 { font-size: 1rem; margin: 24px 0 8px; }
p { margin: 0; }
p + p { margin-top: 10px; }
code, pre { font-family: var(--mono); }
code {
  font-size: .88em; background: var(--soft);
  padding: 2px 6px; border-radius: 6px;
}
pre code { background: none; padding: 0; }
pre {
  background: var(--code-bg); color: #E8E8EC;
  border-radius: 12px; padding: 16px 18px;
  overflow-x: auto; font-size: .84rem; line-height: 1.55;
  margin: 12px 0 0; box-shadow: var(--shadow);
}
table {
  width: 100%; border-collapse: collapse;
  margin: 14px 0; font-size: .95rem;
}
th, td {
  text-align: left; padding: 10px 12px;
  border-bottom: 1px solid var(--line); vertical-align: top;
}
th { color: var(--ink2); font-weight: 500; }
.lead { color: var(--ink2); font-size: 1.05rem; margin: 0 0 20px; max-width: 62ch; }
.banner {
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  color: var(--warn-ink); padding: 12px 14px; border-radius: 12px;
  margin: 0 0 24px; font-size: .92rem;
}
.banner strong { color: var(--ink); }
.banner code {
  background: color-mix(in srgb, var(--ink) 8%, transparent);
  color: inherit;
}

/* Sticky top */
.hdr {
  position: sticky; top: 0; z-index: 40;
  padding-top: env(safe-area-inset-top, 0px);
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.hdr-in {
  display: flex; align-items: center; gap: 6px;
  height: var(--hdr);
  max-width: 1280px; margin: 0 auto;
  padding-inline: clamp(16px, 2vw, 24px);
}
.brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 16px; letter-spacing: -.03em;
  margin-right: 4px; flex: none;
}
.brand svg { width: 18px; height: 18px; }
.brand-sub {
  font-size: 12px; font-weight: 500; color: var(--ink2);
  padding: 3px 8px; border-radius: 999px; background: var(--soft);
  margin-right: 8px;
}
.top-nav { display: flex; gap: 2px; }
.top-nav a {
  font-size: 13.5px; font-weight: 500;
  padding: 7px 12px; border-radius: 999px; color: var(--ink2);
}
.top-nav a:hover, .top-nav a[aria-current="page"] {
  background: var(--soft); color: var(--ink);
}
.sp { flex: 1; }
.icon-btn {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; border: 0; border-radius: 999px;
  background: none;
}
.icon-btn:hover { background: var(--soft); }
.icon-btn svg { width: 17px; height: 17px; }
.pill {
  display: inline-flex; align-items: center; justify-content: center;
  height: 34px; padding: 0 14px; border-radius: 999px; border: 0;
  font-size: 13.5px; font-weight: 500;
}
.pill.soft { background: var(--soft); }
.pill.soft:hover { background: var(--soft2); }
.pill.dark { background: var(--ink); color: var(--bg); }
.pill.dark:hover { opacity: .84; }
a.pill { text-decoration: none; }

/* Shell: sidebar + content */
.shell {
  display: grid;
  grid-template-columns: var(--side) minmax(0, 1fr);
  max-width: 1280px; margin: 0 auto;
  min-height: calc(100vh - var(--hdr));
}
.side {
  position: sticky; top: var(--hdr);
  height: calc(100vh - var(--hdr));
  overflow-y: auto;
  padding: 20px 12px 40px 16px;
  border-right: 1px solid var(--line);
  background: var(--bg);
}
.side-label {
  font-size: 11px; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--ink3);
  padding: 8px 12px 6px;
}
.side a {
  display: block; font-size: 13.5px; font-weight: 500;
  color: var(--ink2); padding: 8px 12px; border-radius: 8px;
  margin-bottom: 2px;
}
.side a:hover { background: var(--soft); color: var(--ink); }
.side a[aria-current="page"] {
  background: var(--soft); color: var(--ink);
}
.content {
  padding: 32px clamp(20px, 4vw, 48px) 80px;
  max-width: 760px;
}
.content a:not(.pill) {
  color: var(--acc-ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.foot-note {
  margin-top: 48px; padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: .88rem; color: var(--ink3);
  display: flex; flex-wrap: wrap; gap: 6px 12px;
}
.foot-note a { color: var(--acc-ink); }

.menu-btn {
  display: none;
  border: 0; background: var(--soft);
  width: 34px; height: 34px; border-radius: 999px;
  align-items: center; justify-content: center;
}
.menu-btn svg { width: 18px; height: 18px; }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .side {
    position: fixed; left: 0; top: var(--hdr); z-index: 35;
    width: min(280px, 86vw); transform: translateX(-105%);
    transition: transform .2s var(--ease);
    box-shadow: var(--shadow); border-right: 1px solid var(--line);
  }
  .side.open { transform: translateX(0); }
  .menu-btn { display: inline-grid; }
  .brand-sub { display: none; }
  .top-nav .hide-sm { display: none; }
}