:root {
  --ink: #171717; --body: #4d4d4d; --mute: #888888;
  --hairline: #ebebeb; --hairline-strong: #a1a1a1;
  --canvas: #ffffff; --canvas-soft: #fafafa; --canvas-soft-2: #f5f5f5;
  --primary: #171717; --on-primary: #ffffff;
  --link: #0070f3; --link-deep: #0761d1; --link-bg-soft: #d3e5ff;
  --warning: #f5a623; --warning-soft: #ffefcf; --warning-deep: #ab570a;
  --error: #ee0000; --error-soft: #f7d4d6; --error-deep: #c50000;
  --ok: #1a9e80; --ok-soft: #d6f2ea;
  --violet: #7928ca; --violet-soft: #ece3f9;
  --code-bg: #171717; --code-fg: #ededed;
  --shadow-2: 0 0 0 1px #00000014, 0px 1px 1px #00000005, 0px 2px 2px #0000000a;
  --shadow-3: 0 0 0 1px #00000014, 0px 2px 2px #0000000a, 0px 8px 8px -8px #0000000a;
  --shadow-5: 0 0 0 1px #00000014, 0px 1px 1px #00000005, 0px 8px 16px -4px #0000000a, 0px 24px 32px -8px #0000000f;
  --sans: "Geist", Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #ededed; --body: #a1a1a1; --mute: #7a7a7a;
    --hairline: #262626; --hairline-strong: #454545;
    --canvas: #0a0a0a; --canvas-soft: #111111; --canvas-soft-2: #1a1a1a;
    --primary: #ededed; --on-primary: #0a0a0a;
    --link: #3291ff; --link-deep: #52a8ff; --link-bg-soft: #0f2a4d;
    --warning-soft: #3a2a0a; --warning-deep: #f1a10d;
    --error-soft: #3c1618; --error-deep: #ff6166;
    --ok: #3ccfa8; --ok-soft: #0e2f27;
    --violet: #a57cf0; --violet-soft: #25163d;
    --code-bg: #111111; --code-fg: #ededed;
    --shadow-2: 0 0 0 1px #ffffff17; --shadow-3: 0 0 0 1px #ffffff17; --shadow-5: 0 0 0 1px #ffffff1f, 0 24px 32px -8px #00000080;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #ededed; --body: #a1a1a1; --mute: #7a7a7a;
  --hairline: #262626; --hairline-strong: #454545;
  --canvas: #0a0a0a; --canvas-soft: #111111; --canvas-soft-2: #1a1a1a;
  --primary: #ededed; --on-primary: #0a0a0a;
  --link: #3291ff; --link-deep: #52a8ff; --link-bg-soft: #0f2a4d;
  --warning-soft: #3a2a0a; --warning-deep: #f1a10d;
  --error-soft: #3c1618; --error-deep: #ff6166;
  --ok: #3ccfa8; --ok-soft: #0e2f27;
  --violet: #a57cf0; --violet-soft: #25163d;
  --code-bg: #111111; --code-fg: #ededed;
  --shadow-2: 0 0 0 1px #ffffff17; --shadow-3: 0 0 0 1px #ffffff17; --shadow-5: 0 0 0 1px #ffffff1f, 0 24px 32px -8px #00000080;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 88px; }
body { margin: 0; background: var(--canvas-soft); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 24px; -webkit-font-smoothing: antialiased; }
::selection { background: var(--primary); color: var(--canvas-soft); }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; }
:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 6px; }

/* ---------- nav ---------- */
.nav { position: sticky; top: 0; z-index: 30; height: 64px; display: flex; align-items: center; gap: 16px; padding: 0 24px; background: color-mix(in srgb, var(--canvas) 88%, transparent); backdrop-filter: saturate(180%) blur(8px); border-bottom: 1px solid var(--hairline); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 600; font-size: 16px; letter-spacing: -0.32px; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 22px; height: 22px; border-radius: 6px; background: var(--primary); display: grid; place-items: center; }
.brand-mark svg { width: 14px; height: 14px; }
.badge { display: inline-flex; align-items: center; height: 20px; padding: 0 8px; border-radius: 9999px; background: var(--canvas-soft-2); color: var(--body); font: 400 12px/16px var(--mono); border: 1px solid var(--hairline); }
.search { position: relative; flex: 1; max-width: 420px; margin-left: auto; }
.search input { width: 100%; height: 32px; padding: 0 64px 0 34px; border: 1px solid var(--hairline); border-radius: 6px; background: var(--canvas); color: var(--ink); font: 400 14px/20px var(--sans); letter-spacing: -0.28px; }
.search input::placeholder { color: var(--mute); }
.search input:focus { outline: none; border-color: var(--hairline-strong); box-shadow: 0 0 0 3px color-mix(in srgb, var(--link) 18%, transparent); }
.search .icon { position: absolute; left: 10px; top: 8px; width: 16px; height: 16px; color: var(--mute); }
.search kbd { position: absolute; right: 8px; top: 6px; font: 400 11px/18px var(--mono); color: var(--mute); border: 1px solid var(--hairline); border-radius: 4px; padding: 0 5px; background: var(--canvas-soft); }
.results { position: absolute; top: 40px; left: 0; right: 0; background: var(--canvas); border-radius: 12px; box-shadow: var(--shadow-5); padding: 6px; display: none; max-height: 420px; overflow: auto; }
.results.open { display: block; }
.results a { display: block; padding: 8px 10px; border-radius: 6px; color: var(--ink); }
.results a:hover, .results a.sel { background: var(--canvas-soft-2); text-decoration: none; }
.results .r-title { font-weight: 500; font-size: 14px; }
.results .r-group { font: 400 11px/16px var(--mono); color: var(--mute); margin-left: 6px; }
.results .r-snip { font-size: 13px; color: var(--body); line-height: 18px; margin-top: 2px; }
.results mark { background: var(--link-bg-soft); color: inherit; border-radius: 3px; padding: 0 1px; }
.results .empty { padding: 12px; color: var(--mute); font-size: 14px; }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn { width: 32px; height: 32px; border-radius: 9999px; border: 1px solid var(--hairline); background: var(--canvas); color: var(--ink); display: grid; place-items: center; cursor: pointer; }
.icon-btn:hover { background: var(--canvas-soft-2); }
.icon-btn svg { width: 16px; height: 16px; }
.btn-sm { display: inline-flex; align-items: center; height: 32px; padding: 0 12px; border-radius: 6px; background: var(--primary); color: var(--on-primary); font: 500 14px/20px var(--sans); letter-spacing: -0.28px; white-space: nowrap; }
.btn-sm:hover { text-decoration: none; opacity: .9; }
.menu-btn { display: none; }

/* ---------- layout ---------- */
.shell { display: grid; grid-template-columns: 264px minmax(0, 1fr) 220px; max-width: 1400px; margin: 0 auto; }
.sidebar { position: sticky; top: 64px; height: calc(100vh - 64px); overflow-y: auto; padding: 24px 16px 48px 24px; border-right: 1px solid var(--hairline); }
.side-group { margin-bottom: 20px; }
.side-label { font: 400 12px/16px var(--mono); color: var(--mute); text-transform: uppercase; letter-spacing: .4px; padding: 0 12px; margin-bottom: 6px; }
.side-link { position: relative; display: block; padding: 6px 12px; border-radius: 6px; color: var(--body); font-size: 14px; line-height: 20px; letter-spacing: -0.28px; }
.side-link:hover { background: var(--canvas-soft-2); color: var(--ink); text-decoration: none; }
.side-link.active { color: var(--ink); font-weight: 500; background: var(--canvas); box-shadow: var(--shadow-2); }
.side-link.active::before { content: ""; position: absolute; left: 0; top: 7px; bottom: 7px; width: 2px; border-radius: 2px; background: var(--primary); }
main { min-width: 0; padding: 40px 48px 96px; }
.toc { position: sticky; top: 64px; height: calc(100vh - 64px); overflow-y: auto; padding: 40px 24px 24px 8px; }
.toc-label { font: 400 12px/16px var(--mono); color: var(--mute); text-transform: uppercase; letter-spacing: .4px; margin-bottom: 10px; }
.toc a { display: block; font-size: 13px; line-height: 18px; color: var(--body); padding: 4px 0 4px 12px; border-left: 1px solid var(--hairline); }
.toc a:hover { color: var(--ink); text-decoration: none; }
.toc a.on { color: var(--ink); border-left-color: var(--primary); font-weight: 500; }

/* ---------- article ---------- */
article { max-width: 780px; }
.page { display: none; }
.page.active { display: block; }
.crumb { font: 400 12px/16px var(--mono); color: var(--mute); text-transform: uppercase; letter-spacing: .4px; margin-bottom: 12px; }
article h1 { font-size: 40px; line-height: 44px; font-weight: 600; letter-spacing: -1.8px; margin: 0 0 16px; }
.lead { font-size: 18px; line-height: 28px; color: var(--body); margin: 0 0 32px; }
article h2 { font-size: 24px; line-height: 32px; font-weight: 600; letter-spacing: -0.96px; margin: 48px 0 12px; padding-top: 8px; }
article h3 { font-size: 18px; line-height: 28px; font-weight: 600; letter-spacing: -0.4px; margin: 32px 0 8px; }
article p, article li { color: var(--body); }
article p { margin: 0 0 16px; }
article strong { color: var(--ink); font-weight: 500; }
article ul, article ol { padding-left: 22px; margin: 0 0 16px; }
article li { margin: 4px 0; }
code { font: 400 13px/20px var(--mono); background: var(--canvas-soft-2); border: 1px solid var(--hairline); border-radius: 4px; padding: 1px 5px; color: var(--ink); }
.formula { background: var(--code-bg); color: var(--code-fg); border-radius: 8px; padding: 20px 24px; font: 400 15px/24px var(--mono); margin: 20px 0 24px; overflow-x: auto; }
.formula .c { color: #8f8f8f; display: block; font-size: 12px; margin-top: 6px; }
.table-wrap { overflow-x: auto; margin: 16px 0 24px; border-radius: 8px; box-shadow: var(--shadow-2); background: var(--canvas); }
table { width: 100%; border-collapse: collapse; font-size: 14px; line-height: 20px; letter-spacing: -0.28px; }
th { text-align: left; font: 400 12px/16px var(--mono); text-transform: uppercase; letter-spacing: .3px; color: var(--mute); background: var(--canvas-soft); padding: 10px 12px; border-bottom: 1px solid var(--hairline); white-space: nowrap; }
td { padding: 10px 12px; border-bottom: 1px solid var(--hairline); color: var(--body); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
td strong { color: var(--ink); }
figure { margin: 24px 0 32px; }
figure .frame { background: #ffffff; border-radius: 12px; box-shadow: var(--shadow-3); padding: 16px; overflow: hidden; }
figure img { display: block; width: 100%; height: auto; }
figcaption { font-size: 13px; line-height: 18px; color: var(--mute); margin-top: 10px; }
figcaption b { font: 400 12px/16px var(--mono); color: var(--body); margin-right: 6px; }
.callout { border-radius: 8px; padding: 14px 16px 14px 16px; margin: 20px 0 24px; font-size: 15px; line-height: 22px; display: grid; grid-template-columns: 20px 1fr; gap: 10px; }
.callout p { margin: 0; color: inherit; }
.callout p + p { margin-top: 6px; }
.callout .ci { width: 18px; height: 18px; margin-top: 2px; }
.callout.weldia { background: var(--link-bg-soft); color: var(--ink); }
.callout.weldia .ci { color: var(--link); }
.callout.warn { background: var(--warning-soft); color: var(--ink); }
.callout.warn .ci { color: var(--warning-deep); }
.callout.tip { background: var(--ok-soft); color: var(--ink); }
.callout.tip .ci { color: var(--ok); }
.callout .ct { font: 500 12px/16px var(--mono); text-transform: uppercase; letter-spacing: .3px; display: block; margin-bottom: 4px; }
.kbd { font: 500 12px/18px var(--mono); border: 1px solid var(--hairline-strong); border-bottom-width: 2px; border-radius: 4px; padding: 0 6px; background: var(--canvas); color: var(--ink); white-space: nowrap; }
.pill { display: inline-flex; align-items: center; height: 22px; padding: 0 8px; border-radius: 9999px; font: 400 12px/16px var(--mono); border: 1px solid var(--hairline); background: var(--canvas); color: var(--body); white-space: nowrap; }
.pill.good { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }
.pill.warn { color: var(--warning-deep); border-color: color-mix(in srgb, var(--warning) 50%, transparent); }
.pill.crit { color: var(--error-deep); border-color: color-mix(in srgb, var(--error) 40%, transparent); }
.pill.info { color: var(--link); border-color: color-mix(in srgb, var(--link) 40%, transparent); }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 16px 0 24px; }
.steps li { counter-increment: s; position: relative; padding: 0 0 18px 44px; margin: 0; }
.steps li::before { content: counter(s, decimal-leading-zero); position: absolute; left: 0; top: 0; width: 30px; height: 24px; font: 500 12px/24px var(--mono); color: var(--ink); background: var(--canvas); box-shadow: var(--shadow-2); border-radius: 6px; text-align: center; }
.steps li::after { content: ""; position: absolute; left: 15px; top: 28px; bottom: 4px; width: 1px; background: var(--hairline); }
.steps li:last-child::after { display: none; }
.steps b { color: var(--ink); font-weight: 500; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--hairline); }
.pager a { display: block; padding: 16px; border-radius: 8px; background: var(--canvas); box-shadow: var(--shadow-2); color: var(--ink); }
.pager a:hover { text-decoration: none; box-shadow: var(--shadow-3); }
.pager .pl { font: 400 12px/16px var(--mono); color: var(--mute); display: block; margin-bottom: 4px; }
.pager .next { text-align: right; grid-column: 2; }
.source { margin-top: 24px; font: 400 12px/16px var(--mono); color: var(--mute); }

/* ---------- home ---------- */
.hero { position: relative; margin: -40px -48px 48px; padding: 96px 48px 72px; overflow: hidden; border-bottom: 1px solid var(--hairline); background: var(--canvas); }
.mesh { position: absolute; inset: -40% -10% auto -10%; height: 150%; pointer-events: none; opacity: .55; filter: blur(60px); background:
  radial-gradient(40% 35% at 20% 40%, #007cf0 0%, transparent 70%),
  radial-gradient(35% 35% at 45% 25%, #00dfd8 0%, transparent 70%),
  radial-gradient(35% 40% at 70% 35%, #7928ca 0%, transparent 70%),
  radial-gradient(30% 35% at 85% 55%, #ff0080 0%, transparent 70%),
  radial-gradient(35% 30% at 60% 60%, #f9cb28 0%, transparent 70%); }
:root[data-theme="dark"] .mesh { opacity: .35; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .mesh { opacity: .35; } }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to bottom, transparent 30%, var(--canvas) 95%); pointer-events: none; }
.hero-inner { position: relative; z-index: 1; max-width: 720px; }
.banner { display: inline-flex; align-items: center; gap: 8px; height: 28px; padding: 0 12px; border-radius: 9999px; background: var(--canvas-soft); box-shadow: var(--shadow-2); font-size: 13px; color: var(--body); margin-bottom: 20px; }
.banner .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); }
.hero h1 { font-size: 56px; line-height: 56px; letter-spacing: -2.8px; font-weight: 600; margin: 0 0 20px; }
.hero .lead { font-size: 19px; line-height: 30px; max-width: 600px; margin-bottom: 28px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; height: 44px; padding: 0 20px; border-radius: 100px; font: 500 16px/24px var(--sans); }
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--primary); color: var(--on-primary); }
.btn.secondary { background: var(--canvas); color: var(--ink); box-shadow: var(--shadow-2); }
.eyebrow { font: 400 12px/16px var(--mono); color: var(--mute); text-transform: uppercase; letter-spacing: .4px; margin: 0 0 8px; }
.home-h2 { font-size: 28px; line-height: 36px; letter-spacing: -1.1px; font-weight: 600; margin: 0 0 20px; }
.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-bottom: 56px; }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-bottom: 56px; }
.card { display: block; background: var(--canvas); border-radius: 8px; padding: 24px; box-shadow: var(--shadow-3); color: var(--ink); transition: box-shadow .15s; }
.card:hover { text-decoration: none; box-shadow: var(--shadow-5); }
.card .k { font: 400 12px/16px var(--mono); color: var(--mute); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.card .k i { width: 8px; height: 8px; border-radius: 2px; display: inline-block; }
.card h3 { font-size: 18px; line-height: 26px; letter-spacing: -0.5px; font-weight: 600; margin: 0 0 6px; }
.card p { font-size: 14px; line-height: 20px; color: var(--body); margin: 0; letter-spacing: -0.28px; }
.card ul { margin: 12px 0 0; padding: 0; list-style: none; }
.card li { font-size: 14px; line-height: 20px; color: var(--body); padding: 6px 0; border-top: 1px solid var(--hairline); }
.card li a { color: var(--ink); }
.dark-band { background: var(--primary); color: var(--on-primary); border-radius: 12px; padding: 40px; margin-bottom: 56px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: center; }
.dark-band h2 { font-size: 28px; line-height: 36px; letter-spacing: -1.1px; margin: 0 0 12px; font-weight: 600; }
.dark-band p { color: color-mix(in srgb, var(--on-primary) 70%, transparent); margin: 0 0 20px; font-size: 16px; }
.dark-band .eyebrow { color: color-mix(in srgb, var(--on-primary) 55%, transparent); }
.dark-band .btn.secondary { box-shadow: none; }
.dark-band .code { background: color-mix(in srgb, var(--on-primary) 8%, transparent); border: 1px solid color-mix(in srgb, var(--on-primary) 14%, transparent); border-radius: 8px; padding: 20px; font: 400 13px/22px var(--mono); color: color-mix(in srgb, var(--on-primary) 88%, transparent); }
.dark-band .code .m { color: color-mix(in srgb, var(--on-primary) 45%, transparent); }
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin-bottom: 56px; border-radius: 8px; box-shadow: var(--shadow-2); background: var(--canvas); }
.stat { padding: 20px 24px; border-right: 1px solid var(--hairline); }
.stat:last-child { border-right: 0; }
.stat .v { font-size: 28px; line-height: 36px; letter-spacing: -1.1px; font-weight: 600; }
.stat .l { font-size: 13px; line-height: 18px; color: var(--body); }
footer { border-top: 1px solid var(--hairline); padding: 32px 0 0; margin-top: 72px; font-size: 13px; color: var(--mute); display: flex; gap: 16px; justify-content: space-between; flex-wrap: wrap; }

/* ---------- responsive ---------- */
@media (max-width: 1199px) { .shell { grid-template-columns: 248px minmax(0, 1fr); } .toc { display: none; } }
@media (max-width: 959px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; top: 64px; left: 0; bottom: 0; width: 290px; height: auto; z-index: 25; background: var(--canvas); transform: translateX(-100%); transition: transform .2s; box-shadow: var(--shadow-5); }
  body.side-open .sidebar { transform: none; }
  .menu-btn { display: grid; }
  main { padding: 32px 24px 80px; }
  .hero { margin: -32px -24px 40px; padding: 64px 24px 56px; }
  .grid3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dark-band { grid-template-columns: 1fr; padding: 28px; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--hairline); }
  .btn-sm.ws { display: none; }
}
@media (max-width: 599px) {
  .nav { padding: 0 16px; gap: 10px; }
  .brand .badge { display: none; }
  .search kbd { display: none; }
  .search input { padding-right: 10px; }
  main { padding: 24px 16px 64px; }
  .hero { margin: -24px -16px 32px; padding: 48px 16px 40px; }
  .hero h1 { font-size: 38px; line-height: 40px; letter-spacing: -1.8px; }
  article h1 { font-size: 32px; line-height: 38px; letter-spacing: -1.3px; }
  .grid3, .grid2 { grid-template-columns: minmax(0, 1fr); }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
  figure .frame { padding: 8px; }
}
@media print { .nav, .sidebar, .toc, .pager { display: none !important; } .shell { display: block; } .page { display: block !important; page-break-after: always; } }

/* seletor de idioma e ligação ao site */
.langs { display: flex; gap: 2px; padding: 2px; border-radius: 9999px; box-shadow: inset 0 0 0 1px var(--hairline); }
.langs a { font: 500 12px/1 var(--mono); color: var(--body); text-decoration: none; padding: 6px 8px; border-radius: 9999px; }
.langs a[aria-current="true"] { background: var(--primary); color: var(--on-primary); }
@media (hover: hover) { .langs a:not([aria-current="true"]):hover { color: var(--ink); background: var(--canvas-soft-2); } }
@media (max-width: 720px) { .site { display: none; } }
.btn-sm.site { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--hairline); }