/* ZB Stack Docs 0947 — tokens from the live site (base.css) */
:root {
  --bg: #ffffff;
  --bg-alt: #f7f7f5;
  --soft: #fafaf8;
  --ink: #141414;
  --text: #2b2b28;
  --muted: #6e6e68;
  --faint: #a1a19b;
  --line: #e8e8e3;
  --line-strong: #d6d6d0;
  --amber: #b45309;
  --amber-bright: #f59e0b;
  --amber-wash: #fbf4e8;
  --solid: #111111;
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --top: 108px;
}
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top) + 16px); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 16px/1.65 var(--sans); }
a { color: inherit; }
img { max-width: 100%; display: block; }
.ic { width: 16px; height: 16px; flex: none; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 99; background: var(--solid); color: #fff; padding: 8px 12px; border-radius: 6px; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 4px; }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; height: 38px; padding: 0 16px; border-radius: 999px; border: 1px solid var(--line-strong); font: 500 14px/1 var(--sans); text-decoration: none; color: var(--ink); background: var(--bg); transition: transform .15s, background .15s, border-color .15s; white-space: nowrap; }
.btn:hover { border-color: #b9b9b2; background: var(--bg-alt); }
.btn--primary { background: var(--solid); border-color: var(--solid); color: #fff; box-shadow: 0 1px 2px rgba(20,20,20,.12), 0 8px 20px -10px rgba(20,20,20,.35); }
.btn--primary:hover { background: #262624; border-color: #262624; transform: translateY(-1px); }
.btn .ic { width: 15px; height: 15px; }

/* top bar + tabs */
.top { position: sticky; top: 0; z-index: 40; background: rgba(255,255,255,.92); backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.top__bar { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px; height: 60px; padding: 0 24px; max-width: 1480px; margin: 0 auto; }
.top__logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.top__logo img { height: 26px; width: auto; }
.top__logo span { font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); padding: 5px 7px; border: 1px solid var(--line); border-radius: 6px; }
.top__search { justify-self: center; width: min(420px, 100%); display: flex; align-items: center; gap: 10px; height: 38px; padding: 0 10px 0 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg-alt); color: var(--muted); font: 400 14px/1 var(--sans); cursor: pointer; transition: border-color .15s, background .15s; }
.top__search:hover { border-color: var(--line-strong); background: #fff; }
.top__search span { flex: 1; text-align: left; }
kbd { font: 500 11px/1 var(--mono); color: var(--muted); border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 5px; padding: 3px 6px; background: #fff; }
.top__right { display: flex; align-items: center; gap: 18px; }
.top__site { font-size: 14px; color: var(--muted); text-decoration: none; }
.top__site:hover { color: var(--ink); }
.top__menu { display: none; width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 8px; background: #fff; padding: 0 9px; cursor: pointer; flex-direction: column; justify-content: center; gap: 5px; }
.top__menu i { display: block; height: 1.5px; background: var(--ink); border-radius: 2px; }
.tabs { display: flex; gap: 4px; height: 48px; align-items: stretch; padding: 0 24px; max-width: 1480px; margin: 0 auto; overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tabs__a { display: flex; align-items: center; padding: 0 12px; font-size: 14.5px; font-weight: 500; color: var(--muted); text-decoration: none; border-bottom: 2px solid transparent; white-space: nowrap; transition: color .15s; }
.tabs__a:hover { color: var(--ink); }
.tabs__a.is-on { color: var(--ink); border-bottom-color: var(--amber-bright); }

/* shell */
.shell { display: grid; grid-template-columns: 272px minmax(0, 1fr); max-width: 1480px; margin: 0 auto; }
.side { position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; border-right: 1px solid var(--line); scrollbar-width: thin; }
.side__in { padding: 24px 16px 48px 20px; }
.side__g + .side__g { margin-top: 22px; }
.side__h { margin: 0 0 6px 10px; font: 500 10.5px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--faint); }
.side__a { display: flex; align-items: center; gap: 10px; padding: 7px 10px; border-radius: 8px; font-size: 14.5px; line-height: 1.35; color: var(--text); text-decoration: none; transition: background .12s, color .12s; }
.side__a .ic { color: var(--faint); }
.side__a:hover { background: var(--bg-alt); color: var(--ink); }
.side__a.is-on { background: var(--amber-wash); color: var(--amber); font-weight: 500; }
.side__a.is-on .ic { color: var(--amber); }
.side__tabs { display: none; }

.main { display: grid; grid-template-columns: minmax(0, 760px) 232px; gap: 56px; justify-content: center; padding: 40px 40px 80px; min-width: 0; }
.toc { position: relative; }
.toc__in { position: sticky; top: calc(var(--top) + 40px); max-height: calc(100vh - var(--top) - 60px); overflow-y: auto; }
.toc__h { display: flex; align-items: center; gap: 8px; margin: 0 0 10px; font-size: 13px; font-weight: 600; color: var(--ink); }
.toc__a { display: block; padding: 5px 0 5px 12px; border-left: 1px solid var(--line); font-size: 13.5px; line-height: 1.4; color: var(--muted); text-decoration: none; }
.toc__a--3 { padding-left: 24px; font-size: 13px; }
.toc__a:hover { color: var(--ink); }
.toc__a.is-on { color: var(--amber); border-left-color: var(--amber-bright); }

/* article head */
.art { min-width: 0; }
.kicker { margin: 0 0 12px; font: 500 11px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); }
.art__row { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.art h1 { margin: 0; font: 430 clamp(34px, 1.2rem + 2.2vw, 48px)/1.05 var(--serif); letter-spacing: -0.028em; color: var(--ink); font-feature-settings: "kern", "liga", "ss01"; }
.copy { flex: none; margin-top: 8px; display: inline-flex; align-items: center; gap: 7px; height: 32px; padding: 0 12px; border: 1px solid var(--line); border-radius: 8px; background: #fff; font: 500 13px/1 var(--sans); color: var(--muted); cursor: pointer; }
.copy:hover { color: var(--ink); border-color: var(--line-strong); }
.lede { margin: 16px 0 0; font-size: 19px; line-height: 1.55; color: var(--muted); max-width: 62ch; }
.art__head { padding-bottom: 28px; margin-bottom: 8px; border-bottom: 1px solid var(--line); }

/* prose */
.prose { font-size: 16.5px; line-height: 1.7; }
.prose > :first-child { margin-top: 24px; }
.prose p { margin: 16px 0; }
.prose h2 { position: relative; margin: 52px 0 6px; font: 450 28px/1.2 var(--serif); letter-spacing: -0.02em; color: var(--ink); }
.prose h3 { position: relative; margin: 32px 0 4px; font: 600 18px/1.35 var(--sans); color: var(--ink); }
.anchor { position: absolute; left: -22px; top: 0; padding-right: 6px; color: var(--faint); text-decoration: none; opacity: 0; transition: opacity .12s; font-weight: 400; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; }
.prose a { color: var(--amber); text-decoration: underline; text-decoration-color: rgba(180,83,9,.35); text-underline-offset: 3px; }
.prose a:hover { text-decoration-color: var(--amber); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose ul, .prose ol { padding-left: 22px; margin: 14px 0; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--faint); }
.prose code { font: 500 .86em/1 var(--mono); background: var(--bg-alt); border: 1px solid var(--line); border-radius: 5px; padding: 2px 5px; color: var(--ink); }

.shot { margin: 28px 0; }
.shot a { display: block; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--bg-alt); box-shadow: 0 1px 2px rgba(20,20,20,.04), 0 18px 40px -28px rgba(20,20,20,.35); }
.shot img { width: 100%; height: auto; }
.shot figcaption { margin-top: 10px; font-size: 13.5px; line-height: 1.5; color: var(--muted); }
.shot--narrow { max-width: 420px; }

.table { margin: 22px 0; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.table table { width: 100%; border-collapse: collapse; font-size: 14.5px; line-height: 1.5; }
.table th { text-align: left; font: 500 10.5px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); background: var(--soft); padding: 11px 14px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.table td { padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table tr:last-child td { border-bottom: 0; }
.table td:first-child { color: var(--ink); font-weight: 500; }

.code { position: relative; margin: 22px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--soft); overflow: hidden; }
.code pre { margin: 0; padding: 18px 18px; overflow-x: auto; font: 400 13.5px/1.65 var(--mono); color: var(--ink); }
.code pre code { background: none; border: 0; padding: 0; font: inherit; }
.code__lang { position: absolute; top: 10px; right: 70px; font: 500 10.5px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--faint); padding-top: 4px; }
.code__copy { position: absolute; top: 8px; right: 8px; height: 26px; padding: 0 9px; border: 1px solid var(--line); border-radius: 6px; background: #fff; font: 500 12px/1 var(--sans); color: var(--muted); cursor: pointer; }
.code__copy:hover { color: var(--ink); }

.callout { margin: 24px 0; padding: 16px 18px; border-radius: 12px; border: 1px solid var(--line); background: var(--soft); font-size: 15.5px; }
.callout > :last-child { margin-bottom: 0; }
.callout p { margin: 8px 0; }
.callout__t { display: flex; align-items: center; gap: 8px; margin: 0 0 4px !important; font: 600 14px/1.4 var(--sans); color: var(--ink); }
.callout--tip { background: var(--amber-wash); border-color: #f1e2c6; }
.callout--tip .callout__t { color: var(--amber); }
.callout--example .callout__t .ic { color: var(--amber); }
.callout--open { background: #fff7ed; border: 1px dashed #f59e0b; }
.callout--open .callout__t { color: #9a3412; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.callout ul { margin: 6px 0; }

.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 22px 0; }
.card { position: relative; display: flex; flex-direction: column; gap: 6px; padding: 18px 40px 18px 18px; border: 1px solid var(--line); border-radius: 14px; background: #fff; text-decoration: none !important; color: var(--text) !important; transition: border-color .15s, transform .15s, box-shadow .15s; }
.card:hover { border-color: var(--line-strong); transform: translateY(-1px); box-shadow: 0 14px 30px -24px rgba(20,20,20,.4); }
.card > .ic { width: 20px; height: 20px; color: var(--amber); margin-bottom: 4px; }
.card b { font-size: 15.5px; color: var(--ink); }
.card span { font-size: 14.5px; line-height: 1.5; color: var(--muted); }
.card__go { position: absolute; right: 16px; top: 18px; color: var(--faint); }
.card:hover .card__go { color: var(--amber); }

.steps { list-style: none; padding: 0 !important; margin: 26px 0; counter-reset: s; }
.step { display: grid; grid-template-columns: 34px 1fr; gap: 16px; position: relative; padding-bottom: 8px; margin: 0 !important; }
.step:not(:last-child)::before { content: ""; position: absolute; left: 16px; top: 36px; bottom: 0; width: 1px; background: var(--line); }
.step__n { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; background: var(--amber-wash); color: var(--amber); font: 500 13px/1 var(--mono); border: 1px solid #f1e2c6; }
.step h3 { margin: 5px 0 0 !important; }
.step p { margin: 6px 0 14px; }

/* article foot */
.art__foot { margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--line); }
.helpful { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: 14.5px; color: var(--muted); }
.helpful button { height: 32px; padding: 0 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff; font: 500 13.5px/1 var(--sans); color: var(--ink); cursor: pointer; }
.helpful button:hover { border-color: var(--line-strong); }
.helpful em { font-style: normal; }
.helpful em a { color: var(--amber); }
.pns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 28px; }
.pn { display: flex; flex-direction: column; gap: 4px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; transition: border-color .15s; }
.pn:hover { border-color: var(--line-strong); }
.pn small { font: 500 10.5px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--faint); }
.pn b { font-size: 15.5px; font-weight: 500; color: var(--ink); }
.pn--next { text-align: right; grid-column: 2; }

.foot { border-top: 1px solid var(--line); background: var(--soft); }
.foot__in { max-width: 1480px; margin: 0 auto; padding: 28px 24px; display: flex; flex-wrap: wrap; align-items: center; gap: 18px 32px; }
.foot__logo img { height: 22px; width: auto; }
.foot nav { display: flex; flex-wrap: wrap; gap: 20px; }
.foot a { font-size: 14px; color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--ink); }
.foot p { margin: 0 0 0 auto; font: 400 11px/1.6 var(--mono); letter-spacing: .06em; color: var(--faint); }

/* search modal */
.sk { position: fixed; inset: 0; z-index: 80; background: rgba(20,20,20,.28); display: flex; justify-content: center; align-items: flex-start; padding: 12vh 16px 16px; }
.sk[hidden] { display: none; }
.sk__box { width: min(640px, 100%); max-height: 70vh; display: flex; flex-direction: column; background: #fff; border-radius: 16px; border: 1px solid var(--line); box-shadow: 0 30px 80px -30px rgba(20,20,20,.45); overflow: hidden; }
.sk__in { display: flex; align-items: center; gap: 10px; padding: 0 16px; height: 56px; border-bottom: 1px solid var(--line); color: var(--muted); }
.sk__in input { flex: 1; border: 0; outline: 0; font: 400 17px/1 var(--sans); color: var(--ink); background: none; }
.sk__in input::-webkit-search-cancel-button { display: none; }
.sk__res { overflow-y: auto; padding: 8px; }
.sk__item { display: block; padding: 10px 12px; border-radius: 10px; text-decoration: none; }
.sk__item small { display: block; font: 500 10px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--faint); }
.sk__item b { display: block; font-size: 15px; font-weight: 500; color: var(--ink); }
.sk__item span { display: block; font-size: 13.5px; line-height: 1.45; color: var(--muted); }
.sk__item mark { background: var(--amber-wash); color: var(--amber); border-radius: 3px; }
.sk__item.is-on, .sk__item:hover { background: var(--bg-alt); }
.sk__empty { padding: 18px 12px; color: var(--muted); font-size: 14.5px; }

/* ---------- welcome page ---------- */
.is-home .main { grid-template-columns: minmax(0, 960px); }
.is-home .toc { display: none; }
.hero { position: relative; display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; align-items: center; padding: 44px 44px; border-radius: 22px; border: 1px solid var(--line); background: radial-gradient(120% 90% at 85% 15%, #fff 0, #fbf6ec 55%, #f7f1e4 100%); overflow: hidden; margin: 0 !important; }
.hero::after { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(180,83,9,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(180,83,9,.05) 1px, transparent 1px); background-size: 28px 28px; mask-image: linear-gradient(90deg, transparent 30%, #000 75%); -webkit-mask-image: linear-gradient(90deg, transparent 30%, #000 75%); pointer-events: none; }
.hero h1 { margin: 0; font: 430 clamp(40px, 1.4rem + 3.2vw, 64px)/1 var(--serif); letter-spacing: -0.035em; color: var(--ink); }
.hero h1 em { font-style: italic; font-weight: 400; color: var(--amber); }
.hero p.hero__sub { margin: 18px 0 26px; font-size: 18px; line-height: 1.55; color: var(--muted); max-width: 40ch; }
.hero__btns { display: flex; flex-wrap: wrap; gap: 10px; }
.hero__btns a { text-decoration: none !important; }
.hero__btns .btn--primary { color: #fff !important; }
.hero__btns .btn:not(.btn--primary) { color: var(--ink) !important; }
.hero__art { position: relative; z-index: 1; height: 250px; }
.stk { position: absolute; left: 50%; top: 50%; width: 250px; transform: translate(-50%, -50%); display: grid; gap: 14px; }
.stk div { height: 50px; border-radius: 11px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px; font: 500 11px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; box-shadow: 0 14px 30px -18px rgba(20,20,20,.5); }
.stk div:nth-child(1) { background: #f59e0b; color: #3b2203; transform: translateX(-18px); }
.stk div:nth-child(2) { background: #7a828b; color: #fff; }
.stk div:nth-child(3) { background: #3a3f45; color: #fff; transform: translateX(18px); }
.stk div i { font-style: normal; opacity: .75; letter-spacing: .04em; text-transform: none; font-family: var(--sans); font-size: 12.5px; }
.journey { display: grid; grid-template-columns: 220px 1fr; gap: 24px; align-items: center; margin: 22px 0 0 !important; padding: 18px; border: 1px solid var(--line); border-radius: 18px; text-decoration: none !important; color: var(--text) !important; transition: border-color .15s, box-shadow .15s; }
.journey:hover { border-color: var(--line-strong); box-shadow: 0 18px 40px -30px rgba(20,20,20,.4); }
.journey img { border-radius: 10px; border: 1px solid var(--line); }
.journey b { display: block; font: 450 22px/1.25 var(--serif); letter-spacing: -0.015em; color: var(--ink); }
.journey span { display: block; margin: 6px 0 10px; color: var(--muted); font-size: 15.5px; }
.journey em { font-style: normal; font-weight: 500; color: var(--amber); font-size: 14.5px; }
.uses { list-style: none; padding: 0 !important; margin: 18px 0 !important; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.uses li { margin: 0 !important; border-bottom: 1px solid var(--line); }
.uses li:last-child { border-bottom: 0; }
.uses a { display: grid; grid-template-columns: 22px 1fr auto; gap: 14px; align-items: center; padding: 14px 18px; text-decoration: none !important; color: var(--text) !important; transition: background .12s; }
.uses a:hover { background: var(--soft); }
.uses .ic { width: 20px; height: 20px; color: var(--amber); }
.uses b { display: block; color: var(--ink); font-weight: 500; font-size: 15.5px; }
.uses span { display: block; color: var(--muted); font-size: 14.5px; line-height: 1.45; }
.uses i { color: var(--faint); }
.cards--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .main { grid-template-columns: minmax(0, 760px); padding: 36px 32px 72px; }
  .toc { display: none; }
}
@media (max-width: 900px) {
  :root { --top: 60px; }
  .tabs { display: none; }
  .top__bar { grid-template-columns: auto auto 1fr; gap: 12px; padding: 0 16px; }
  .top__menu { display: flex; }
  .top__search { justify-self: end; width: 40px; padding: 0; justify-content: center; }
  .top__search span, .top__search kbd, .top__site { display: none; }
  .top__right { justify-self: end; }
  .top__right .btn { height: 34px; padding: 0 12px; font-size: 13px; }
  .top__bar { grid-template-columns: auto 1fr auto auto; }
  .shell { display: block; }
  .side { position: fixed; top: var(--top); left: 0; bottom: 0; height: auto; width: min(320px, 86vw); background: #fff; z-index: 35; transform: translateX(-100%); transition: transform .2s; box-shadow: 0 0 0 100vmax rgba(20,20,20,0); }
  body.menu-open .side { transform: none; box-shadow: 0 0 0 100vmax rgba(20,20,20,.25); }
  .side__tabs { display: block; }
  .main { padding: 28px 16px 64px; }
  .anchor { display: none; }
  .hero { grid-template-columns: 1fr; padding: 32px 24px; }
  .hero__art { height: 210px; }
  .journey { grid-template-columns: 1fr; }
  .cards, .cards--3 { grid-template-columns: 1fr; }
  .foot p { margin-left: 0; }
}
@media (max-width: 520px) {
  .top__logo span { display: none; }
  .art__row { flex-direction: column; gap: 12px; }
  .copy { margin-top: 0; }
  .lede { font-size: 17.5px; }
  .pns { grid-template-columns: 1fr; }
  .pn--next { grid-column: auto; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }