:root {
  --logo-day: block;
  --logo-night: none;
  color-scheme: light;
  --header-height: clamp(54px, 5.3vw, 76px);
  --motion-fast: .16s;
  --motion: .35s;
  --motion-slow: .8s;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --distance: 18px;
  --theme-duration: 1s;
  --theme-curve: cubic-bezier(.5, 0, .2, 1);
  --paper: #faf9f6;
  --ink: #0a0a0a;
  --ink-soft: #2a2a2a;
  --accent: #c4161c;
  --accent-hover: #9c1016;
  --line: #3a3a3a;
  --gray: #444;
  --gray-2: #666;
  --hairline: #d6d4cd;
  --mid: #bdbbb4;
  --code: #ecebe6;
  --box: #f1efe9;
  --pre-background: #16161a;
  --accent-text: #c4161c;
  --accent-text-hover: #9c1016;
  --margin: clamp(20px, 4.1vw, 66px);
  --f-headline: "League Gothic", "Archivo Narrow", "Arial Narrow", Impact, sans-serif;
  --f-text: "Archivo", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
  color-scheme: dark;
  --logo-day: none;
  --logo-night: block;
  --paper: #121110;
  --ink: #f1eee8;
  --ink-soft: #d8d5cf;
  --line: #8f8b84;
  --gray: #bdb9b1;
  --gray-2: #9a968f;
  --hairline: #34322f;
  --mid: #4a4743;
  --code: #262421;
  --box: #1c1a18;
  --pre-background: #0a0a0c;
  --accent-text: #f2555a;
  --accent-text-hover: #ff8a8e;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --logo-day: none;
  --logo-night: block;
  --paper: #121110;
  --ink: #f1eee8;
  --ink-soft: #d8d5cf;
  --line: #8f8b84;
  --gray: #bdb9b1;
  --gray-2: #9a968f;
  --hairline: #34322f;
  --mid: #4a4743;
  --code: #262421;
  --box: #1c1a18;
  --pre-background: #0a0a0c;
  --accent-text: #f2555a;
  --accent-text-hover: #ff8a8e;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 8px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-text);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }

.page { max-width: 1680px; margin: 0 auto; background: var(--paper); }

:focus-visible { outline: 2px solid var(--accent-text); outline-offset: 3px; }
.closing :focus-visible, .footer :focus-visible, .guide-cta :focus-visible, .band :focus-visible { outline-color: #fff; }
.footer--light :focus-visible { outline-color: var(--ink); }
.skip-link { position: absolute; left: 12px; top: -64px; z-index: 100; padding: 12px 18px; background: var(--ink); color: var(--paper); font: 600 14px/1 var(--f-text); text-decoration: none; }
.skip-link:focus { top: 12px; }

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 14px;
  padding: 0 clamp(22px, 2.3vw, 36px);
  height: clamp(46px, 4.5vw, 62px);
  font: 500 clamp(16px, 1.55vw, 22px)/1 var(--f-text);
  font-stretch: 78%;
  text-decoration: none;
  transition: background var(--motion-fast) var(--ease), color var(--motion-fast) var(--ease), transform var(--motion-fast) var(--ease);
}
.button--accent { background: var(--accent); color: #fff; }
.button--accent:hover { background: var(--accent-hover); }
.button--white { background: #fff; color: #0a0a0a; }
.button--white:hover { background: #ffe3e0; }
.button--small { height: 34px; padding: 0 clamp(16px, 2.2vw, 34px); font-size: 13px; font-stretch: 100%; }
.arrow-diagonal, .arrow-right { width: 1em; height: 1em; flex: none; }
.arrow-right { width: 1.1em; height: 1.1em; }

.header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  height: var(--header-height);
  padding: 0 var(--margin);
  background: var(--paper);
}
.brand { display: flex; align-items: center; gap: 16px; text-decoration: none; min-width: 0; }
.brand__name {
  font: 800 clamp(16px, 1.55vw, 22px)/1 var(--f-text);
  font-stretch: 75%; text-transform: uppercase; letter-spacing: -.005em; white-space: nowrap;
}
.menu { display: flex; align-items: center; gap: clamp(16px, 2.3vw, 34px); }
.menu a:not(.button) { font-size: clamp(12px, 1.1vw, 15px); font-weight: 500; text-decoration: none; }
.menu a:not(.button):hover { color: var(--accent-text); }
.menu a { white-space: nowrap; }

.hero { display: grid; grid-template-columns: 59.5% minmax(0, 1fr); align-items: stretch; }
.hero__text { padding: clamp(28px, 3.9vw, 64px) clamp(8px, 1vw, 16px) clamp(28px, 3vw, 50px) var(--margin); display: flex; flex-direction: column; align-items: flex-start; }
.headline {
  margin: 0;
  font: 400 min(13.4vw, 220px)/.84 var(--f-headline);
  white-space: nowrap;
  text-transform: uppercase; letter-spacing: 0;
  -webkit-text-stroke: .018em currentColor; paint-order: stroke fill;
}
.hero__sub { margin: clamp(12px, 1.5vw, 24px) 0 clamp(14px, 2vw, 32px); padding-top: clamp(10px, 1.2vw, 18px); position: relative; font-size: clamp(15px, 1.65vw, 24px); max-width: 28em; }
.hero__sub::before { content: ""; position: absolute; top: 0; left: 0; width: 31px; height: 1px; background: var(--ink); }

.hero__art { position: relative; overflow: hidden; background: var(--accent); min-height: 100%; }
.gridline { position: absolute; background: rgba(255,255,255,.7); }
.gridline--v { left: 25.2%; top: 0; bottom: 0; width: 1px; }
.gridline--h { left: 0; right: 0; top: 71.5%; height: 1px; }
.arc { position: absolute; left: 11.5%; top: -2.5%; width: 89%; aspect-ratio: 1; border-radius: 50%; border: 1px solid rgba(255,255,255,.75); }
.statue { position: absolute; left: 2%; bottom: -1%; width: 106%; height: auto; filter: saturate(.55) contrast(1.04); }
.rule { display: block; width: 16px; height: 1px; background: #fff; margin-bottom: 10px; }

.panorama { overflow: hidden; background: #2b0608; }
.panorama img { width: 100%; height: auto; aspect-ratio: 3.74 / 1; object-fit: cover; object-position: 40% 38%; }

.project { padding: 0 var(--margin) clamp(36px, 5vw, 80px); }
.label { display: flex; align-items: center; gap: 12px; padding: 14px 0 0; font: 500 clamp(10px, .95vw, 13px)/1 var(--f-text); }
.project__body { display: grid; grid-template-columns: 1fr 41.8%; gap: clamp(24px, 4vw, 64px); align-items: start; padding-top: clamp(32px, 4.4vw, 70px); }
.section-title {
  margin: 0;
  font: 800 clamp(46px, 8.1vw, 134px)/.93 var(--f-text);
  font-stretch: 68%; letter-spacing: -.035em;
}

.toc { border-top: 0; }
.row { border-bottom: 1px solid var(--line); }
.row summary {
  list-style: none; cursor: pointer;
  display: grid; grid-template-columns: clamp(58px, 7.9vw, 124px) 1fr auto; align-items: center;
  padding: clamp(12px, 1.45vw, 22px) 0;
}
.row summary::-webkit-details-marker { display: none; }
.row__number { font: 800 clamp(30px, 4.35vw, 68px)/1 var(--f-text); font-stretch: 70%; letter-spacing: -.02em; color: var(--accent-text); }
.row__title { font: 600 clamp(20px, 2.35vw, 36px)/1.1 var(--f-text); font-stretch: 75%; letter-spacing: -.01em; transition: color var(--motion-fast) var(--ease); }
.row__arrow { width: clamp(18px, 1.7vw, 26px); height: auto; transition: transform var(--motion) var(--ease); }
.row summary:hover .row__title { color: var(--accent-text); }
.row summary:hover .row__arrow { transform: translateX(5px); }
.row[open] .row__arrow { transform: rotate(90deg); }
.row[open] summary:hover .row__arrow { transform: rotate(90deg) translateX(5px); }
.row:last-child { border-bottom: 1px solid var(--line); }

.row__body { padding: 2px 0 clamp(22px, 2.4vw, 34px) clamp(58px, 7.9vw, 124px); }
.prose { font-size: clamp(14px, 1.2vw, 17px); line-height: 1.6; color: var(--ink-soft); max-width: 62ch; }
.prose p { margin: 0 0 .9em; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--ink); font-weight: 700; }
.prose ul { margin: 0; padding-left: 1.1em; }
.prose li { margin-bottom: .5em; }
.prose li::marker { color: var(--accent-text); }
.prose code { font: 500 .88em ui-monospace, Consolas, monospace; background: var(--code); padding: .1em .35em; }
.prose a { color: var(--accent-text); }
.changes { margin: 0; }
.changes dt { margin-top: 1em; font: 800 11px/1 var(--f-text); letter-spacing: .16em; text-transform: uppercase; color: var(--accent-text); }
.changes dt:first-child { margin-top: 0; }
.changes dd { margin: 6px 0 0; }
.note { margin-top: 1.2em !important; font-size: .85em; color: var(--gray-2); }
.steps { margin: 0 0 1.1em; padding-left: 1.3em; }
.steps li { margin-bottom: .35em; padding-left: .2em; }
.steps li::marker { color: var(--accent-text); font-weight: 800; }
.requirement { padding: 10px 14px; background: var(--code); border-left: 3px solid var(--accent-text); }

.closing { position: relative; overflow: hidden; background: var(--accent); min-height: clamp(250px, 21.1vw, 400px); display: flex; align-items: center; }
.closing__background {
  position: absolute; right: 0; top: -5%; width: 93%; height: auto;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 40%);
          mask-image: linear-gradient(90deg, transparent 0, #000 40%);
}
.closing__text { position: relative; padding: clamp(24px, 2.4vw, 40px) var(--margin); color: #fff; display: flex; flex-direction: column; align-items: flex-start; }
.closing-title { margin: 0 0 clamp(18px, 2.1vw, 32px); font: 800 clamp(34px, 4.7vw, 76px)/.95 var(--f-text); font-stretch: 70%; letter-spacing: -.03em; }
.closing__note { margin: clamp(14px, 1.8vw, 26px) 0 0; font: 500 clamp(11px, .85vw, 12px)/1 var(--f-text); letter-spacing: .14em; }

.footer {
  position: relative; display: flex; align-items: center; justify-content: space-between;
  background: var(--accent); color: #fff;
  padding: clamp(14px, 1.9vw, 30px) var(--margin);
  border-top: 1px solid rgba(255,255,255,.7);
}
.footer p { margin: 0; font: 500 clamp(11px, .85vw, 12px)/1 var(--f-text); letter-spacing: .14em; }

.external-link::after { content: "\2197"; content: "\2197" / ""; margin-left: .25em; font-size: .85em; }
.closing__note a { color: #fff; text-underline-offset: 3px; }
.dl-buttons { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 28px; }

.block { display: grid; grid-template-columns: 1fr 41.8%; gap: clamp(24px, 4vw, 64px); align-items: start; padding: clamp(40px, 5.5vw, 90px) var(--margin) clamp(32px, 4vw, 64px); }
.block + .block { border-top: 1px solid var(--line); }
.block .section-title { font-size: clamp(46px, 8.1vw, 134px); }
.hash { font-size: .88em; word-break: break-all; }
.hash-note { margin-top: 22px; font-size: clamp(12px, 1vw, 14px); color: var(--gray-2); }

.footer__back { color: #fff; font: 500 clamp(11px, .85vw, 12px)/1 var(--f-text); letter-spacing: .14em; text-decoration: underline; text-underline-offset: 4px; }
[aria-current="page"] { cursor: default; }

.menu a:not(.button)[aria-current="page"] { box-shadow: 0 2px 0 var(--accent-text); padding: 6px 0; }
.guide-hero { display: grid; grid-template-columns: 56% minmax(0, 1fr); align-items: stretch; }
.guide-hero__text { padding: clamp(24px, 2.6vw, 44px) clamp(8px, 1vw, 16px) clamp(28px, 3.4vw, 56px) var(--margin); display: flex; flex-direction: column; align-items: flex-start; }
.breadcrumbs { display: flex; align-items: center; gap: 10px; margin-bottom: clamp(18px, 3.4vw, 56px); font-size: clamp(11px, 1.15vw, 15px); color: var(--gray); }
.breadcrumbs a { color: var(--gray); text-underline-offset: 3px; }
.breadcrumbs a:hover { color: var(--accent-text); }
.guide-hero__art { position: relative; overflow: hidden; background: var(--accent); min-height: 100%; }
.guide-hero__art .gridline--v { left: 26%; }
.guide-hero__art .gridline--h { top: 84%; }
.guide-hero__art .arc { left: 60%; top: -30%; width: 84%; }
.shield { position: absolute; left: 14%; top: -3%; width: 92%; height: auto; }

.guide-layout { display: grid; grid-template-columns: clamp(190px, 23.5vw, 330px) minmax(0, 1fr); margin: clamp(18px, 2.2vw, 32px) var(--margin) 0; border-top: 1px solid var(--line); }
.guide-index { align-self: start; position: sticky; top: calc(var(--header-height) + 16px); padding: clamp(20px, 2.4vw, 34px) 20px 0 0; }
.guide-index__title { margin: 0 0 18px; font: 800 11px/1 var(--f-text); letter-spacing: .2em; text-transform: uppercase; }
.guide-index ol { list-style: none; margin: 0; padding: 0; }
.guide-index a { display: flex; align-items: baseline; gap: 18px; padding: 11px 0 11px 14px; border-left: 2px solid transparent; text-decoration: none; font-size: clamp(14px, 1.35vw, 18px); }
.guide-index a span { font-weight: 600; font-size: .9em; font-variant-numeric: tabular-nums; }
.guide-index a b { font-weight: 500; font-stretch: 92%; }
.guide-index a:hover { color: var(--accent-text); }
.guide-index a[aria-current] { border-left-color: var(--accent-text); color: var(--accent-text); }

.guide-content { border-left: 1px solid #8a8a8a; padding: clamp(20px, 2.4vw, 34px) 0 0 clamp(24px, 4.5vw, 64px); min-width: 0; }
.guide-section { --col: clamp(54px, 6.2vw, 88px); padding-bottom: clamp(26px, 3vw, 44px); }
.guide-section + .guide-section { border-top: 1px solid var(--line); padding-top: clamp(22px, 2.6vw, 38px); }
.guide-section__head { display: grid; grid-template-columns: var(--col) 1fr; align-items: start; margin-bottom: clamp(14px, 1.6vw, 24px); }
.guide-section__number { font: 800 clamp(40px, 5.4vw, 84px)/.88 var(--f-text); font-stretch: 62%; letter-spacing: -.03em; color: var(--accent-text); }
.guide-section__title { margin: 0; font: 800 clamp(34px, 4.6vw, 72px)/.92 var(--f-text); font-stretch: 62%; letter-spacing: -.035em; }
.guide-section__intro { margin: 8px 0 0; font-size: clamp(15px, 1.5vw, 20px); }
.guide-steps { list-style: none; counter-reset: gp; margin: 0; padding: 0; }
.guide-steps li { counter-increment: gp; position: relative; padding: clamp(10px, 1.1vw, 16px) 0 clamp(10px, 1.1vw, 16px) var(--col); font-size: clamp(15px, 1.45vw, 19px); }
.guide-steps li + li { border-top: 1px solid var(--mid); }
.guide-steps li::before { content: counter(gp, decimal-leading-zero); position: absolute; left: 0; top: clamp(12px, 1.3vw, 19px); font: 800 clamp(14px, 1.5vw, 20px)/1 var(--f-text); color: var(--accent-text); }
.guide-steps code { font: 500 .85em ui-monospace, Consolas, monospace; background: var(--code); padding: .1em .35em; }
.guide-section > .guide-link { margin: clamp(10px, 1.2vw, 18px) 0 0 var(--col); }
.guide-link { display: inline-flex; align-items: center; gap: 8px; color: var(--accent-text); font-size: clamp(14px, 1.35vw, 18px); font-weight: 500; text-underline-offset: 4px; }
.guide-link svg { width: 1em; height: 1em; flex: none; }
.guide-link:hover { color: var(--accent-text-hover); }
.guide-two { display: grid; grid-template-columns: 1fr 1fr; margin-left: var(--col); }
.guide-two > div { padding: 4px 0; }
.guide-two > div + div { border-left: 1px solid #8a8a8a; padding-left: clamp(18px, 3vw, 44px); }
.guide-two h3 { margin: 0 0 8px; font: 800 11px/1 var(--f-text); letter-spacing: .2em; text-transform: uppercase; }
.guide-two p { margin: 0; font-size: clamp(15px, 1.45vw, 19px); }
.guide-note { margin: clamp(14px, 1.6vw, 24px) 0 0 var(--col); font-size: clamp(13px, 1.15vw, 15px); color: var(--gray); max-width: 70ch; }

.guide-section--faq { padding-bottom: clamp(20px, 2.4vw, 36px); }
.guide-faq-title { margin: 0 0 clamp(16px, 1.8vw, 26px); font: 800 clamp(38px, 5vw, 78px)/.95 var(--f-text); font-stretch: 62%; letter-spacing: -.035em; }
.faq__item { border-top: 1px solid var(--line); }
.faq__item:last-child { border-bottom: 1px solid var(--line); }
.faq__item summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: clamp(34px, 3.8vw, 56px) 1fr; align-items: center; padding: clamp(14px, 1.5vw, 22px) 0; font: 600 clamp(16px, 1.55vw, 21px)/1.25 var(--f-text); font-stretch: 88%; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::before { content: "+"; content: "+" / ""; font: 400 clamp(22px, 2vw, 30px)/1 var(--f-text); }
.faq__item[open] summary::before { content: "\2212"; content: "\2212" / ""; color: var(--accent-text); }
.faq__item summary:hover { color: var(--accent-text); }
.faq__answer { padding: 0 0 clamp(16px, 1.8vw, 26px) clamp(34px, 3.8vw, 56px); }

.guide-cta { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; background: var(--accent); color: #fff; padding: clamp(22px, 2.6vw, 40px) var(--margin); margin-top: clamp(28px, 3.6vw, 56px); }
.guide-cta h2 { margin: 0; font: 800 clamp(36px, 5vw, 78px)/.95 var(--f-text); font-stretch: 62%; letter-spacing: -.03em; }
.guide-cta .button { min-width: clamp(190px, 26vw, 380px); }
.footer--light { background: var(--paper); color: var(--ink); border-top: 0; margin: clamp(14px, 1.7vw, 24px) var(--margin) 0; padding-left: 0; padding-right: 0; border-top: 1px solid var(--line); }
.footer--light .footer__back { color: var(--ink); }

.headline--sdk { font-size: min(10.8vw, 180px); white-space: normal; }
.badge { margin: 0 0 clamp(16px, 2vw, 28px); padding: 9px 14px; border: 1.5px solid var(--ink); font: 700 clamp(10px, .95vw, 13px)/1.35 var(--f-text); letter-spacing: .14em; text-transform: uppercase; }
.guide-hero__art--sdk { container-type: size; }
.exploded-box { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); height: min(90cqh, 108cqw); aspect-ratio: 1122 / 1402; }
.exploded { display: block; width: 100%; height: 100%; }
.blueprint { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; fill: none; stroke: #fff; pointer-events: none; }
.blueprint * { vector-effect: non-scaling-stroke; }
.blueprint__guides { stroke-width: 1; stroke-dasharray: 6 7; opacity: .3; }
.blueprint__boxes { stroke-width: 1; stroke-dasharray: 6 5; opacity: .75; }

.row--category .row__title { display: flex; flex-direction: column; gap: 3px; }
.row--category .row__title b { font-weight: 600; }
.row--category .row__title small { font: 400 clamp(13px, 1.15vw, 16px)/1.3 var(--f-text); font-stretch: 100%; color: var(--gray); letter-spacing: 0; }
.guide-list { list-style: none; margin: 0; padding: 0 0 clamp(12px, 1.4vw, 20px) clamp(58px, 7.9vw, 124px); }
.guide-list li { padding: 9px 0; border-top: 1px solid var(--hairline); font-size: clamp(14px, 1.2vw, 16px); line-height: 1.45; }
.guide-list li:first-child { border-top: 0; }
.guide-list a { margin-right: 8px; font-weight: 700; color: var(--ink); text-underline-offset: 3px; }
.guide-list a:hover { color: var(--accent-text); }
.guide-list span { color: var(--gray); }
.guide-list code, .table-wrap code { font: 500 .88em ui-monospace, Consolas, monospace; background: var(--code); padding: .1em .35em; }
#more-list { padding-left: 0; }

.band { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px 24px; background: var(--accent); color: #fff; padding: clamp(18px, 2vw, 30px) var(--margin); }
.band h2 { margin: 0; font: 800 clamp(28px, 3.9vw, 60px)/1 var(--f-text); font-stretch: 62%; letter-spacing: -.03em; }
.band p { margin: 0; padding-left: clamp(16px, 2.4vw, 36px); border-left: 1px solid rgba(255, 255, 255, .6); font-size: clamp(13px, 1.2vw, 17px); }

.guide-mini { margin: 0 0 8px; font: 800 11px/1 var(--f-text); letter-spacing: .2em; text-transform: uppercase; color: var(--accent-text); }
.guide-mini--spaced { margin-top: clamp(22px, 2.6vw, 38px); }
.prose--wide { max-width: none; }
.prose--wide p { margin-bottom: 1.4em; }

.block--cards { grid-template-columns: minmax(0, 1fr); }
.three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.three > div { padding: 0 clamp(16px, 2.4vw, 36px); border-left: 1px solid #8a8a8a; }
.three > div:first-child { padding-left: 0; border-left: 0; }
.three__number { font: 800 clamp(30px, 4vw, 60px)/1 var(--f-text); font-stretch: 62%; color: var(--accent-text); letter-spacing: -.02em; }
.three h3 { margin: 6px 0; font: 700 clamp(18px, 1.9vw, 26px)/1.1 var(--f-text); font-stretch: 80%; }
.three p { margin: 0 0 12px; font-size: clamp(14px, 1.2vw, 16px); color: var(--gray); }
.button--outline { background: transparent; color: #fff; box-shadow: inset 0 0 0 2px #fff; }
.button--outline:hover { background: #fff; color: var(--accent); }
.closing .dl-buttons { margin-top: 0; }

.table-wrap { overflow-x: auto; margin: 1em 0; }
.table-wrap table { border-collapse: collapse; width: 100%; font-size: clamp(13px, 1.15vw, 16px); }
.table-wrap th { text-align: left; font: 800 11px/1 var(--f-text); letter-spacing: .16em; text-transform: uppercase; color: var(--accent-text); padding: 10px 14px 10px 0; border-bottom: 2px solid var(--ink); white-space: nowrap; }
.table-wrap td { padding: 10px 14px 10px 0; border-bottom: 1px solid var(--hairline); vertical-align: top; }
.table-wrap td a { color: var(--accent-text); text-underline-offset: 3px; }

.doc-layout { display: grid; grid-template-columns: clamp(210px, 22vw, 300px) minmax(0, 1fr); gap: clamp(24px, 4vw, 64px); padding: clamp(20px, 2.4vw, 36px) var(--margin) clamp(36px, 5vw, 80px); }
.doc-nav { align-self: start; position: sticky; top: calc(var(--header-height) + 16px); max-height: calc(100vh - 110px); overflow: auto; border-right: 1px solid #8a8a8a; padding-right: 18px; }
.doc-nav ol { list-style: none; margin: 0; padding: 0; }
.doc-nav a:not(.guide-link) { display: block; padding: 6px 0 6px 12px; border-left: 2px solid transparent; text-decoration: none; font-size: 14px; }
.doc-nav a:not(.guide-link):hover { color: var(--accent-text); }
.doc-nav a[aria-current] { border-left-color: var(--accent-text); color: var(--accent-text); font-weight: 600; }
.doc-back { margin-top: 16px; font-size: 14px; }
.doc { min-width: 0; max-width: 86ch; font-size: clamp(15px, 1.15vw, 17px); line-height: 1.65; color: var(--ink-soft); }
.doc h1 { margin: 0 0 .5em; font: 800 clamp(38px, 5vw, 76px)/.95 var(--f-text); font-stretch: 62%; letter-spacing: -.035em; color: var(--ink); }
.doc h2 { margin: 1.6em 0 .5em; padding-top: .6em; border-top: 1px solid var(--line); font: 800 clamp(26px, 3vw, 44px)/1 var(--f-text); font-stretch: 68%; letter-spacing: -.03em; color: var(--ink); }
.doc h3 { margin: 1.4em 0 .4em; font: 700 clamp(18px, 1.7vw, 24px)/1.2 var(--f-text); font-stretch: 85%; color: var(--ink); }
.doc a { color: var(--accent-text); text-underline-offset: 3px; }
.doc code { font: 500 .88em ui-monospace, Consolas, monospace; background: var(--code); padding: .1em .35em; }
.doc pre { margin: 1.1em 0; padding: 16px 18px; overflow: auto; background: var(--pre-background); color: #ecebe6; font-size: 13.5px; line-height: 1.5; }
.doc pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
.doc ul, .doc ol { padding-left: 1.3em; }
.doc li { margin: .25em 0; }
.doc li::marker { color: var(--accent-text); }
.doc blockquote { margin: 1em 0; padding: .3em 1em; border-left: 3px solid var(--accent-text); background: var(--box); }
.doc hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }
.doc .table-wrap td, .doc .table-wrap th { padding-right: 16px; }
.in-zip { border-bottom: 1px dotted #888; }

@media (max-width: 820px) {
  .menu a:not(.button), .support-header { display: none; }
  .hero { grid-template-columns: minmax(0, 1fr); }
  .hero__text { order: 1; padding-bottom: 36px; }
  .hero__art { order: 0; aspect-ratio: 1 / .85; }
  .headline { font-size: clamp(54px, 23vw, 170px); }
  .hero__sub { font-size: 17px; }
  .panorama img { aspect-ratio: 16 / 9; object-position: 20% 40%; }
  .project__body, .block { grid-template-columns: minmax(0, 1fr); }
  .guide-hero { grid-template-columns: minmax(0, 1fr); }
  .guide-hero__text { order: 1; }
  .guide-hero__art { order: 0; min-height: 0; aspect-ratio: 1 / .8; }
  .guide-layout { grid-template-columns: minmax(0, 1fr); }
  .guide-index { position: static; padding: 18px 0 8px; }
  .guide-index ol { display: flex; flex-wrap: wrap; gap: 0 18px; }
  .guide-index a { padding: 8px 0; border-left: 0; border-bottom: 2px solid transparent; }
  .guide-index a[aria-current] { border-bottom-color: var(--accent-text); }
  .guide-content { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
  .guide-section { --col: 46px; }
  .guide-two { grid-template-columns: 1fr; margin-left: var(--col); }
  .guide-two > div + div { border-left: 0; padding-left: 0; margin-top: 12px; }
  .guide-section__title { font-size: clamp(32px, 9.5vw, 56px); }
  .guide-faq-title { font-size: clamp(36px, 11vw, 64px); }
  .headline--sdk { font-size: clamp(54px, 19vw, 150px); }
  .three { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .three > div, .three > div:first-child { padding: 18px 0 0; border-left: 0; border-top: 1px solid #8a8a8a; }
  .guide-list { padding-left: 0; }
  .band p { padding-left: 0; border-left: 0; }
  .doc-layout { grid-template-columns: minmax(0, 1fr); }
  .doc-nav { position: static; max-height: none; border-right: 0; border-bottom: 1px solid var(--line); padding: 0 0 12px; }
  .doc-nav ol { display: flex; flex-wrap: wrap; gap: 0 16px; }
  .guide-cta { flex-direction: column; align-items: flex-start; }
  .guide-cta .button { width: 100%; }
  .section-title { font-size: clamp(48px, 15vw, 96px); }
  .row__number { font-size: 38px; }
  .row__title { font-size: 24px; }
  .row summary, .row__body { --c: 64px; }
  .row summary { grid-template-columns: 64px 1fr auto; }
  .row__body { padding-left: 64px; }
  .prose { font-size: 15px; }
  .closing { min-height: 340px; }
  .closing__background { width: auto; height: 100%; max-width: none; right: -20%; top: 0; opacity: .55; -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 70%); mask-image: linear-gradient(90deg, transparent 0, #000 70%); }
  .closing-title { font-size: clamp(40px, 12.5vw, 72px); }
  .button { height: 50px; font-size: 17px; }
  .button--small { height: 36px; font-size: 13px; }
}

.footer { flex-wrap: wrap; gap: 12px 28px; }
.footer__links { display: flex; flex-wrap: wrap; gap: 8px clamp(16px, 2.2vw, 32px); }
.footer__links a { color: #fff; font: 500 clamp(11px, .85vw, 12px)/1 var(--f-text); letter-spacing: .14em; text-decoration: none; text-transform: uppercase; }
.footer__links a { display: inline-flex; align-items: center; gap: .65em; }
.footer__links svg { width: clamp(16px, 1.5vw, 22px); height: clamp(16px, 1.5vw, 22px); flex: none; fill: currentColor; }
.footer__links a:hover { text-decoration: underline; text-underline-offset: 4px; }
.footer--light .footer__links a { color: var(--ink); }
.footer--light .footer__links a:hover { color: var(--accent-text); }

@media (max-width: 480px) {
  .header { gap: 8px; }
  .brand__name { font-size: 14px; }
  .menu { gap: 4px; }
  .theme { width: 28px; height: 28px; }
  .button--small { padding: 0 11px; }
}

a, button, summary { transition: color var(--motion-fast) var(--ease), background-color var(--motion-fast) var(--ease), opacity var(--motion-fast) var(--ease), box-shadow var(--motion-fast) var(--ease), transform var(--motion-fast) var(--ease); }
.button:hover { transform: translateY(-1px); }
.button:active { transform: none; }

.anim-on [data-reveal] { opacity: 0; transition: opacity var(--motion-slow) var(--ease) calc(var(--i, 0) * 90ms), transform var(--motion-slow) var(--ease) calc(var(--i, 0) * 90ms); }
.anim-on [data-reveal="rise"] { transform: translateY(var(--distance)); }
.anim-on [data-reveal="zoom"] { transform: scale(1.05); transition-duration: 1.2s; }
.anim-on [data-reveal].seen { opacity: 1; transform: none; }

.anim-on [data-reveal] .blueprint { opacity: 0; transition: opacity 1s var(--ease) .7s; }
.anim-on [data-reveal].seen .blueprint { opacity: 1; }

details[open] > .row__body, details[open] > .faq__answer { animation: expand var(--motion) var(--ease); }
@keyframes expand { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; transition-delay: 0s !important; }
  .button:hover { transform: none; }
}
@media print {
  .anim-on [data-reveal] { opacity: 1 !important; transform: none !important; }
}

.languages { position: relative; display: inline-flex; }
.languages__button { appearance: none; display: inline-flex; align-items: center; gap: 6px; border: 0; background: transparent; color: var(--ink); cursor: pointer; padding: 6px 8px; font: 700 clamp(10px, .9vw, 12px)/1 var(--f-text); letter-spacing: .1em; }
.languages__button:hover, .languages__button[aria-expanded="true"] { color: var(--accent-text); }
.languages__button svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.languages__button .languages__arrow { width: 10px; height: 10px; stroke-width: 1.8; transition: transform var(--motion) var(--ease); }
.languages__button[aria-expanded="true"] .languages__arrow { transform: rotate(180deg); }
.languages__list { position: absolute; right: 0; top: calc(100% + 8px); z-index: 30; min-width: 170px; margin: 0; padding: 6px; list-style: none; background: var(--paper); border: 1px solid var(--mid); box-shadow: 0 14px 30px rgba(0, 0, 0, .2); animation: expand var(--motion) var(--ease); }
.languages__list[hidden] { display: none; }
.languages__list li { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; padding: 9px 12px; cursor: pointer; font-size: 14px; transition: background-color var(--motion-fast) var(--ease), color var(--motion-fast) var(--ease); }
.languages__list li b { font: 700 11px/1 var(--f-text); letter-spacing: .12em; opacity: .7; }
.languages__list li:hover, .languages__list li:focus { background: var(--code); }
.languages__list li:focus-visible { outline: 2px solid var(--accent-text); outline-offset: -2px; }
.languages__list li[aria-selected="true"] { color: var(--accent-text); font-weight: 700; }

.theme { appearance: none; position: relative; width: 32px; height: 32px; border: 0; background: transparent; color: var(--ink); cursor: pointer; }
.theme:hover { color: var(--accent-text); }
.theme:active { transform: scale(.9); }
.theme svg { position: absolute; left: 50%; top: 50%; width: 18px; height: 18px; margin: -9px 0 0 -9px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; transition: transform var(--motion) var(--ease), opacity var(--motion) var(--ease); }
.theme[data-state="dark"] .moon { opacity: 0; transform: rotate(-80deg) scale(.4); }
.theme[data-state="light"] .sun { opacity: 0; transform: rotate(80deg) scale(.4); }
.theme[data-state="dark"]:hover .sun { transform: rotate(45deg); }
.theme[data-state="light"]:hover .moon { transform: rotate(-16deg); }
.theme-fade *, .theme-fade *::before, .theme-fade *::after { transition: background-color var(--motion) var(--ease), color var(--motion) var(--ease), border-color var(--motion) var(--ease), fill var(--motion) var(--ease), stroke var(--motion) var(--ease); }

.button--small { gap: 8px; }
.button--small svg { width: 13px; height: 13px; flex: none; }
@media (max-width: 480px) {
  .languages__button { padding: 6px 4px; gap: 3px; }
  .languages__button svg:first-child { display: none; }
  .theme { width: 28px; height: 28px; }
}
@media (max-width: 400px) { .button--small svg { display: none; } }

:root[data-theme-transition="true"]::view-transition-old(root),
:root[data-theme-transition="true"]::view-transition-new(root) { animation: none; mix-blend-mode: normal; }
:root[data-theme-transition="true"]::view-transition-new(root) { z-index: 1; animation: theme-reveal var(--theme-duration) var(--theme-curve) both; }
@keyframes theme-reveal {
  from { clip-path: circle(0 at var(--theme-x) var(--theme-y)); }
  to { clip-path: circle(var(--theme-radius) at var(--theme-x) var(--theme-y)); }
}
@media (prefers-reduced-motion: reduce) {
  :root[data-theme-transition="true"]::view-transition-new(root) { animation-duration: 0s; }
}

.anim-on [data-reveal="hero"] { transform: translateY(34px); transition: opacity 1s var(--ease) calc(var(--i, 0) * 120ms + .1s), transform 1s var(--ease) calc(var(--i, 0) * 120ms + .1s); }
.anim-on [data-reveal="img"] { transform: translateX(34px) scale(1.05); transition: opacity 1.3s var(--ease) .35s, transform 1.3s var(--ease) .35s; }
.anim-on [data-reveal] .gridline--v { transform: scaleY(0); transform-origin: top; transition: transform 1.1s var(--ease) .45s; }
.anim-on [data-reveal] .gridline--h { transform: scaleX(0); transform-origin: left; transition: transform 1.1s var(--ease) .65s; }
.anim-on [data-reveal] .arc { opacity: 0; transform: scale(.9); transition: opacity 1s var(--ease) .7s, transform 1.2s var(--ease) .7s; }
.anim-on [data-reveal].seen .gridline--v, .anim-on [data-reveal].seen .gridline--h { transform: none; }
.anim-on [data-reveal].seen .arc { opacity: 1; transform: none; }

.anim-prep [data-reveal], .anim-prep [data-reveal] * { transition: none !important; }

.footer__support { appearance: none; display: inline-flex; align-items: center; gap: .65em; padding: 0; border: 0; background: none; cursor: pointer; color: #fff; font: 500 clamp(11px, .85vw, 12px)/1 var(--f-text); letter-spacing: .14em; text-transform: uppercase; }
.footer__support svg { width: clamp(16px, 1.5vw, 22px); height: clamp(16px, 1.5vw, 22px); flex: none; }
.footer__support:hover span { text-decoration: underline; text-underline-offset: 4px; }
.footer--light .footer__support { color: var(--ink); }

.support { width: min(540px, 92vw); max-height: 90vh; padding: clamp(22px, 3vw, 34px); border: 1px solid var(--mid); background: var(--paper); color: var(--ink); box-shadow: 0 24px 60px rgba(0, 0, 0, .35); overflow: auto; }
.support[open] { animation: expand var(--motion) var(--ease); }
.support::backdrop { background: rgba(0, 0, 0, .55); }
.support h2 { margin: 0 0 10px; font: 800 clamp(28px, 3.4vw, 40px)/1 var(--f-text); font-stretch: 62%; letter-spacing: -.03em; }
.support__intro { margin: 0 0 18px; color: var(--gray); font-size: 15px; line-height: 1.55; }
.support__list { list-style: none; margin: 0; padding: 0; }
.support__list li { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center; padding: 12px 0; border-top: 1px solid var(--hairline); }
.support__label { grid-column: 1 / -1; font: 800 11px/1 var(--f-text); letter-spacing: .16em; text-transform: uppercase; color: var(--accent-text); }
.support__value { min-width: 0; overflow-wrap: anywhere; font: 500 14px/1.4 ui-monospace, Consolas, monospace; background: var(--code); padding: 6px 8px; user-select: all; }
.support__copy, .support__close { box-sizing: border-box; min-width: 88px; text-align: center; appearance: none; cursor: pointer; border: 1px solid var(--ink); background: transparent; color: var(--ink); padding: 8px 14px; font: 600 13px/1 var(--f-text); }
.support__copy:hover, .support__close:hover { background: var(--ink); color: var(--paper); }
.support__open { display: inline-block; text-decoration: none; }
.support__copy--ok, .support__copy--ok:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.support__footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 8px; padding-top: 14px; border-top: 1px solid var(--hairline); font-weight: 600; }
.support__thanks { display: inline-flex; align-items: center; gap: 8px; }
.support__thanks svg { width: 18px; height: 18px; fill: var(--accent); flex: none; }
.support__status { margin: 0; height: 0; overflow: hidden; }

.support-header { appearance: none; padding: 0; border: 0; background: none; cursor: pointer; color: var(--ink); font: 500 clamp(12px, 1.1vw, 15px)/1.5 var(--f-text); white-space: nowrap; }
.support-header:hover { color: var(--accent-text); }
.support-header { --glow-a: #8a0d12; --glow-b: #d4161c; --glow-c: #ff7a2e; color: transparent; background: linear-gradient(45deg, var(--glow-a) 0%, var(--glow-b) 32%, var(--glow-c) 50%, var(--glow-b) 68%, var(--glow-a) 100%) 0 100% / 220% 220% no-repeat; -webkit-background-clip: text; background-clip: text; font-weight: 700; animation: glow-sweep 2s ease-in-out infinite alternate; }
:root[data-theme="dark"] .support-header { --glow-a: #e8343a; --glow-b: #ff6a6e; --glow-c: #fff1ea; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .support-header { --glow-a: #e8343a; --glow-b: #ff6a6e; --glow-c: #fff1ea; } }
@keyframes glow-sweep { 0% { background-position: 0 100%; } 100% { background-position: 100% 0; } }
@media (prefers-reduced-motion: reduce) { .support-header { animation: none; background-position: 50% 50%; } }

@media (min-width: 821px) and (max-width: 1100px) {
  .header { gap: 14px; }
  .menu { gap: 12px; }
  .menu a:not(.button) { font-size: 12.5px; }
  .support-header { font-size: 12.5px; }
}

.brand__emblem { height: clamp(30px, 2.9vw, 42px); width: auto; flex: none; }
@media (max-width: 900px) { .brand__emblem { display: none; } }

.footer__id { display: flex; align-items: center; gap: 14px; }
.footer__logo { display: inline-flex; align-items: center; justify-content: center; flex: none; width: 46px; height: 46px; border-radius: 50%; background: var(--paper); transition: transform var(--motion) var(--ease); }
.footer__logo img { width: 36px; height: auto; display: block; }
.footer__logo:hover { transform: scale(1.06) rotate(-4deg); }
.footer__id p { margin: 0; }
.supporters__list { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 22px; font-size: 17px; }
.credits__lead { display: flex; flex-direction: column; gap: clamp(14px, 1.6vw, 24px); }
.credits__intro { margin: 0; max-width: 24ch; font-size: clamp(16px, 1.5vw, 22px); line-height: 1.4; color: var(--ink-soft); }
.credits__logo { display: inline-flex; align-items: center; gap: clamp(12px, 1.5vw, 22px); margin-top: clamp(8px, 2vw, 32px); width: fit-content; max-width: 100%; }
.credits__isotype { height: clamp(78px, 8.2vw, 124px); width: auto; flex: none; }
.credits__logotype { height: clamp(40px, 4.2vw, 64px); width: auto; min-width: 0; max-width: 100%; }
.credits__logotype--day { display: var(--logo-day); }
.credits__logotype--night { display: var(--logo-night); }
.credits__group ~ .credits__group, #supporters:not([hidden]) { margin-top: clamp(26px, 3vw, 44px); }
.credits__list { list-style: none; margin: 8px 0 0; padding: 0; }
.credits__list li { display: grid; grid-template-columns: minmax(110px, 170px) minmax(0, 1fr) auto; gap: 4px 16px; align-items: baseline; padding: 12px 0; border-top: 1px solid var(--hairline); font-size: clamp(14px, 1.2vw, 16px); line-height: 1.45; }
.credits__list li:first-child { border-top: 0; }
.credits__list a { font-weight: 700; color: var(--ink); text-underline-offset: 3px; }
.credits__list a:hover { color: var(--accent-text); }
.credits__what { color: var(--gray); }
.credits__tag { font: 700 11px/1 var(--f-text); letter-spacing: .08em; text-transform: uppercase; border: 1px solid var(--line); padding: 5px 7px; white-space: nowrap; color: var(--ink-soft); }
@media (max-width: 700px) { .credits__list li { grid-template-columns: minmax(0, 1fr) auto; } .credits__what { grid-column: 1 / -1; grid-row: 2; } }
#credits.block { grid-template-columns: minmax(0, .74fr) minmax(0, 1.26fr); }
@media (max-width: 900px) { #credits.block { grid-template-columns: minmax(0, 1fr); } }
.three__cta { display: flex; justify-content: center; margin-top: calc(clamp(24px, 2.4vw, 44px) - clamp(24px, 4vw, 64px)); }
#start.block { padding-bottom: clamp(28px, 2.4vw, 44px); }
@keyframes heartbeat { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.4); } }
.support__thanks svg, .footer__support svg { transform-origin: center; animation: heartbeat 2.6s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) { .support__thanks svg, .footer__support svg { animation: none; } }
@media (max-width: 480px) { html[lang="it"] .headline { font-size: clamp(54px, 19.5vw, 170px); } }
.menu-toggle { display: none; appearance: none; width: 40px; height: 40px; padding: 0; border: 0; background: none; color: var(--ink); cursor: pointer; }
.menu-toggle span { display: block; width: 22px; height: 2px; margin: 5px auto; background: currentColor; transition: transform var(--motion-fast) var(--ease), opacity var(--motion-fast) var(--ease); }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-nav { position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; padding: 4px var(--margin) 14px; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: 0 18px 30px rgba(0, 0, 0, .18); }
.mobile-nav:not([hidden]) { display: flex; }
.mobile-nav[hidden] { display: none; }
.mobile-nav a, .mobile-nav button { appearance: none; display: flex; align-items: center; min-height: 48px; padding: 0; border: 0; border-top: 1px solid var(--hairline); background: none; color: var(--ink); font: 500 18px/1.2 var(--f-text); text-align: left; text-decoration: none; cursor: pointer; }
.mobile-nav > :first-child { border-top: 0; }
.mobile-nav a[aria-current="page"] { color: var(--accent-text); }
@media (max-width: 820px) { .menu-toggle { display: inline-block; } }
@media (min-width: 821px) { .mobile-nav { display: none !important; } }