@import url("qo-brand.css");

:root {
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--qo-ink-950);
  color: var(--qo-fog);
  font-family: var(--qo-font-text);
  font-size: 18px;
  line-height: 1.55;
  border-left: 6px solid var(--qo-bullion);
}

a { color: var(--qo-bullion); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 32px 64px;
}

header.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(13, 11, 18, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--qo-ink-700);
}

header.top .inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 32px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

header.top a.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
  text-decoration: none;
  color: inherit;
}

header.top a.brand:hover { text-decoration: none; }

header.top .lockup-mark {
  width: 40px;
  height: 40px;
  display: block;
  flex: none;
}

header.top .lockup-type {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--qo-font-display);
  text-transform: uppercase;
  line-height: 1;
}

header.top .lockup-type .q {
  font-size: 15px;
  font-stretch: 125%;
  font-weight: 800;
  font-variation-settings: "wdth" 125, "wght" 800;
}

header.top .lockup-type .amp {
  font-size: 14px;
  color: var(--qo-bullion);
  font-stretch: 110%;
  font-weight: 500;
  font-variation-settings: "wdth" 110, "wght" 500;
}

header.top .lockup-type .o {
  font-size: 15px;
  letter-spacing: 0.16em;
  color: var(--qo-ash);
  font-stretch: 125%;
  font-weight: 300;
  font-variation-settings: "wdth" 125, "wght" 300;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--qo-font-display);
  font-stretch: 125%;
  font-weight: 800;
}

nav a,
.nav-docs { color: var(--qo-ash); }
nav a:hover,
.nav-docs:hover { color: var(--qo-bullion); text-decoration: none; }
nav a.is-active,
.nav-docs.is-active,
.nav-docs[aria-expanded="true"] { color: var(--qo-bullion); }

.nav-docs {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
  cursor: pointer;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.nav-docs-caret {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.75;
  transition: transform 0.15s ease;
}
.nav-docs[aria-expanded="true"] .nav-docs-caret {
  transform: rotate(180deg);
}

.docs-scrim {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(8, 7, 12, 0.58);
  z-index: 15;
}
body.docs-open .docs-scrim { display: block; }
body.docs-open { overflow: hidden; }

.docs-drawer {
  display: none;
  border-top: 1px solid var(--qo-ink-700);
  background: var(--qo-ink-900);
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.55);
  max-height: min(78vh, calc(100vh - 64px));
  overflow-y: auto;
}
body.docs-open .docs-drawer { display: block; }

.docs-drawer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 32px 48px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px 48px;
}

.docs-drawer-toolbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 24px;
  flex-wrap: wrap;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--qo-ink-700);
}

.docs-tabs {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  min-width: 0;
}
.docs-tabs button {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  padding: 10px 4px 12px;
  margin: 0 20px 0 0;
  cursor: pointer;
  font-family: var(--qo-font-display);
  font-stretch: 125%;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--qo-ash);
  line-height: 1;
}
.docs-tabs button:hover { color: var(--qo-fog); }
.docs-drawer[data-drawer-play="solo"] .docs-tabs [data-docs-play="solo"] {
  color: var(--qo-bullion);
  border-bottom-color: var(--qo-bullion);
}
.docs-drawer[data-drawer-play="multi"] .docs-tabs [data-docs-play="multi"] {
  color: var(--qo-anchor);
  border-bottom-color: var(--qo-anchor);
}

.docs-lang {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding-bottom: 8px;
}
.docs-lang-label {
  font-family: var(--qo-font-display);
  font-stretch: 125%;
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--qo-ash-dim);
}
.docs-lang-label.is-on[data-lang-label="bp"] { color: var(--qo-bullion); }
.docs-lang-label.is-on[data-lang-label="cpp"] { color: var(--qo-confirm); }

.docs-lang-switch {
  appearance: none;
  width: 46px;
  height: 26px;
  padding: 0;
  border: 1px solid var(--qo-ink-700);
  border-radius: 999px;
  background: var(--qo-ink-800);
  position: relative;
  cursor: pointer;
  flex: none;
}
.docs-lang-switch[aria-checked="true"] {
  background: rgba(40, 224, 176, 0.22);
  border-color: var(--qo-confirm);
}
.docs-lang-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--qo-bullion);
  transition: transform 0.16s ease, background 0.16s ease;
  pointer-events: none;
}
.docs-lang-switch[aria-checked="true"] .docs-lang-knob {
  transform: translateX(20px);
  background: var(--qo-confirm);
}

.docs-col {
  min-width: 0;
  padding: 8px 0 0;
  border-top: 2px solid var(--qo-ink-700);
}
.docs-drawer[data-drawer-play="solo"] .docs-col { border-top-color: var(--qo-bullion); }
.docs-drawer[data-drawer-play="multi"] .docs-col { border-top-color: var(--qo-anchor); }
.docs-col h2 {
  font-size: 13px;
  letter-spacing: 0.16em;
  margin: 16px 0 14px;
  padding: 0;
  border: 0;
  color: var(--qo-fog);
}
.docs-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.docs-col li { margin: 0; }
.docs-col a {
  display: block;
  padding: 11px 0;
  color: var(--qo-ash);
  font-family: var(--qo-font-text);
  font-size: 16px;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  line-height: 1.3;
  border-bottom: 1px solid var(--qo-ink-700);
}
.docs-col a:hover {
  color: var(--qo-bullion);
  text-decoration: none;
}
.docs-col a.is-here {
  color: var(--qo-bullion);
}
.docs-drawer[data-drawer-play="solo"] .docs-col a:hover,
.docs-drawer[data-drawer-play="solo"] .docs-col a.is-here {
  color: var(--qo-bullion);
}
.docs-drawer[data-drawer-play="multi"] .docs-col a:hover,
.docs-drawer[data-drawer-play="multi"] .docs-col a.is-here {
  color: var(--qo-anchor);
}

.mix-fab {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 14;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  background: rgba(20, 18, 27, 0.94);
  border: 1px solid var(--qo-ink-700);
  border-radius: 10px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(10px);
}
body.docs-open .mix-fab { visibility: hidden; }
.mix-fab .seg-group a {
  min-width: 36px;
  text-align: center;
  padding: 7px 10px;
  font-size: 11px;
}
.mix-fab .seg-group[data-axis="play"] a {
  min-width: 0;
  padding: 7px 12px;
  letter-spacing: 0.08em;
}
.mix-fab .seg-group[data-axis="lang"] {
  width: 100%;
}
.mix-fab .seg-group[data-axis="lang"] a {
  min-width: 0;
  flex: 1;
}
.mix-fab[data-play="solo"] .seg-group[data-axis="play"] a.is-on {
  background: var(--qo-bullion);
  color: #0D0B12;
}
.mix-fab[data-play="multi"] .seg-group[data-axis="play"] a.is-on {
  background: var(--qo-anchor);
  color: #0D0B12;
}
.mix-fab[data-lang="bp"] .seg-group[data-axis="lang"] a.is-on {
  background: var(--qo-bullion);
  color: #0D0B12;
}
.mix-fab[data-lang="cpp"] .seg-group[data-axis="lang"] a.is-on {
  background: var(--qo-confirm);
  color: #0D0B12;
}

.section-pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 48px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--qo-ink-700);
  font-size: 14px;
}
.section-pager a {
  max-width: 46%;
}
.section-pager .next { text-align: right; margin-left: auto; }
.section-pager .dir {
  display: block;
  font-family: var(--qo-font-display);
  font-stretch: 125%;
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--qo-ash-dim);
  margin-bottom: 4px;
}

.path-page {
  --path-accent: var(--qo-bullion);
  --path-accent-ink: #0D0B12;
  --path-lang: var(--qo-bullion);
  --path-wash: rgba(255, 176, 32, 0.12);
  border-left-color: var(--path-accent);
}
.path-page[data-play="multi"] {
  --path-accent: var(--qo-anchor);
  --path-wash: rgba(124, 92, 255, 0.16);
}
.path-page[data-lang="cpp"] {
  --path-lang: var(--qo-confirm);
}
.path-page a { color: var(--path-accent); }
.path-page nav a,
.path-page .nav-docs { color: var(--qo-ash); }
.path-page nav a:hover,
.path-page nav a.is-active,
.path-page .nav-docs:hover,
.path-page .nav-docs.is-active,
.path-page .nav-docs[aria-expanded="true"] { color: var(--path-accent); }
.path-page footer.site a { color: var(--qo-ash); }
.path-page footer.site a:hover { color: var(--path-accent); }
.path-page h2 { border-top-color: var(--path-accent); }
.path-page .callout { border-left-color: var(--path-accent); }
.path-page .callout.fail { border-left-color: var(--qo-fail); }
.path-page[data-lang="cpp"] pre {
  border-color: var(--qo-confirm);
}
.path-page[data-play="multi"] header.top {
  border-bottom-color: #3a2f55;
}
.path-page .lockup-type .amp { color: var(--path-accent); }

.path-switch {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.seg-group {
  display: flex;
  border: 1px solid var(--qo-ink-700);
  border-radius: 6px;
  overflow: hidden;
}
.seg-group a {
  font-family: var(--qo-font-display);
  font-stretch: 125%;
  font-weight: 800;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 8px;
  color: var(--qo-ash);
  background: var(--qo-ink-900);
  text-decoration: none;
  line-height: 1;
}
.seg-group a:hover { color: var(--qo-fog); text-decoration: none; }
.seg-group[data-axis="play"] a.is-on {
  background: var(--path-accent);
  color: var(--path-accent-ink);
}
.seg-group[data-axis="lang"] a {
  flex: 1;
  text-align: center;
  letter-spacing: 0;
  font-stretch: 100%;
  font-family: var(--qo-font-mono);
  font-weight: 700;
  text-transform: none;
  padding: 5px 12px;
  color: var(--qo-fog);
}
.seg-group[data-axis="lang"] a.is-on {
  background: var(--path-lang);
  color: #0D0B12;
}

.hub {
  --path-accent: var(--qo-bullion);
  --path-accent-ink: #0D0B12;
  --path-lang: var(--qo-bullion);
}
.hub[data-play="multi"] {
  --path-accent: var(--qo-anchor);
}
.hub[data-lang="cpp"] {
  --path-lang: var(--qo-confirm);
}
.hub-switch {
  margin: 4px 0 0;
  margin-left: 0;
}
.hub-switch .seg-group a {
  padding: 8px 12px;
  font-size: 11px;
}
.hub-switch .seg-group[data-axis="lang"] {
  min-width: 7.5rem;
}
.hub[data-lang="bp"] .seg-group[data-axis="lang"] a.is-on {
  background: var(--qo-bullion);
  color: #0D0B12;
}
.hub[data-lang="cpp"] .seg-group[data-axis="lang"] a.is-on {
  background: var(--qo-confirm);
  color: #0D0B12;
}
.hub-group {
  margin-top: 36px;
}
.hub-group h2 {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 12px;
  padding: 0;
  border: 0;
  color: var(--qo-fog);
}
.hub-group .cards {
  margin: 0;
}
.hub .card:hover {
  border-color: var(--path-accent);
}
.hub .card .eyebrow {
  color: var(--path-accent);
}
.hub .card.quest .eyebrow {
  color: var(--qo-fog);
}
.hub .card.quest:hover {
  border-color: var(--qo-fog);
}
.hub .card.hud .eyebrow {
  color: var(--qo-confirm);
}
.hub .card.hud:hover {
  border-color: var(--qo-confirm);
}
body:has(.hub) .mix-fab {
  display: none;
}

.card.multi .eyebrow { color: var(--qo-anchor); }
.card.multi:hover { border-color: var(--qo-anchor); }
.card.cpp h3 { font-family: var(--qo-font-mono); text-transform: none; letter-spacing: 0; }
.card.quest .eyebrow { color: var(--qo-fog); }
.card.hud .eyebrow { color: var(--qo-confirm); }
.card.hud:hover { border-color: var(--qo-confirm); }

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 28px 0;
}
@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
}

.card {
  display: block;
  background: var(--qo-ink-900);
  border: 1px solid var(--qo-ink-700);
  border-radius: 8px;
  padding: 22px 22px 20px;
  text-decoration: none;
  color: inherit;
}
.card:hover {
  border-color: var(--qo-bullion);
  text-decoration: none;
}
.card .eyebrow {
  font-family: var(--qo-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--qo-bullion);
  margin: 0 0 8px;
}
.card h3 {
  margin: 0 0 8px;
  border: 0;
  padding: 0;
  color: var(--qo-fog);
}
.card p {
  margin: 0;
  font-size: 15px;
  color: var(--qo-ash);
}

.path-bar {
  background: var(--qo-ink-900);
  border: 1px solid var(--qo-ink-700);
  border-radius: 8px;
  padding: 14px 18px;
  font-size: 15px;
  color: var(--qo-ash);
  margin: 0 0 28px;
}
.path-bar strong { color: var(--qo-fog); }

.shot-slot {
  background: var(--qo-ink-900);
  border: 1px dashed var(--qo-ink-700);
  border-radius: 8px;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  font-family: var(--qo-font-mono);
  font-size: 13px;
  color: var(--qo-ash-dim);
  line-height: 1.5;
}
.shot-slot code {
  background: var(--qo-ink-800);
  color: var(--qo-bullion);
}

.hero {
  padding: 56px 0 24px;
}

h1, h2, h3 {
  font-family: var(--qo-font-display);
  font-stretch: 125%;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.05;
  color: var(--qo-fog);
}

h1 { font-size: clamp(28px, 3.6vw, 40px); margin: 0 0 16px; }
h2 {
  font-size: 32px;
  margin: 56px 0 16px;
  padding-top: 8px;
  border-top: 3px solid var(--qo-bullion);
}
h3 { font-size: 18px; margin: 28px 0 10px; letter-spacing: 0.06em; color: var(--qo-ash); }

.lede {
  font-size: 20px;
  color: var(--qo-ash);
  max-width: 42em;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
}

.chip {
  font-family: var(--qo-font-mono);
  font-size: 12px;
  color: var(--qo-fog);
  border: 1px solid var(--qo-anchor);
  border-radius: 4px;
  padding: 6px 10px;
}

ol.steps {
  padding-left: 1.2em;
}
ol.steps li { margin: 10px 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 16px 0 8px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--qo-ink-700);
  vertical-align: top;
}
th {
  font-family: var(--qo-font-display);
  font-stretch: 125%;
  font-weight: 800;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--qo-ash);
}

code, kbd {
  font-family: var(--qo-font-mono);
  font-size: 0.86em;
  background: var(--qo-ink-800);
  padding: 0.12em 0.4em;
  border-radius: 4px;
}

pre {
  background: var(--qo-ink-800);
  border: 1px solid var(--qo-ink-700);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.45;
}
pre code { background: none; padding: 0; font-size: 13px; }

.callout {
  border-left: 3px solid var(--qo-bullion);
  background: var(--qo-ink-900);
  padding: 14px 18px;
  margin: 20px 0;
  border-radius: 0 8px 8px 0;
}
.callout.fail { border-left-color: var(--qo-fail); }
.callout.later { border-left-color: var(--qo-anchor); }
.callout p { margin: 0; }
.callout strong { color: var(--qo-fog); }

figure {
  margin: 28px 0;
}
figure img,
figure svg.shot {
  width: auto;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  background: var(--qo-ink-900);
}
figure img {
  cursor: zoom-in;
}

.lb {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 48px 56px 28px;
  background: rgba(8, 6, 12, 0.92);
  backdrop-filter: blur(8px);
}
.lb[hidden] { display: none; }
.lb img {
  max-width: min(96vw, 1800px);
  max-height: calc(100vh - 96px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  background: var(--qo-ink-900);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
}
.lb-cap {
  margin: 0;
  max-width: 72ch;
  font-size: 14px;
  color: var(--qo-ash);
  text-align: center;
}
.lb-close,
.lb-prev,
.lb-next {
  position: absolute;
  border: 0;
  background: var(--qo-ink-800);
  color: var(--qo-fog);
  cursor: pointer;
  border-radius: 8px;
  font: inherit;
}
.lb-close {
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  font-size: 22px;
  line-height: 1;
}
.lb-prev,
.lb-next {
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  font-size: 28px;
  line-height: 1;
}
.lb-prev { left: 12px; }
.lb-next { right: 12px; }
.lb-close:hover,
.lb-prev:hover,
.lb-next:hover {
  background: var(--qo-ink-700);
  color: var(--qo-bullion);
}
.lb-prev[hidden],
.lb-next[hidden] { display: none; }
body.lb-open { overflow: hidden; }
body.lb-open .mix-fab { visibility: hidden; }
figcaption {
  font-size: 14px;
  color: var(--qo-ash-dim);
  margin-top: 8px;
}

.diagram {
  background: var(--qo-ink-900);
  border: 1px solid var(--qo-ink-700);
  border-radius: 8px;
  padding: 28px 24px;
  margin: 28px 0;
}

footer.site {
  border-top: 1px solid var(--qo-ink-700);
  background: var(--qo-ink-900);
  padding: 28px 32px 36px;
}
footer.site .inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--qo-ash-dim);
}
footer.site .brand-mini {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--qo-ash);
  text-decoration: none;
}
footer.site .brand-mini:hover { text-decoration: none; color: var(--qo-fog); }
footer.site .brand-mini img { width: 28px; height: 28px; }
footer.site nav {
  gap: 8px 16px;
  font-size: 11px;
}
footer.site nav a { color: var(--qo-ash); }
footer.site nav a:hover { color: var(--qo-bullion); }

ul { padding-left: 1.2em; }
li { margin: 6px 0; }

@media (max-width: 900px) {
  .docs-drawer-inner {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 720px) {
  header.top .lockup-type { display: none; }
  .path-switch { margin-left: 0; width: 100%; }
  .docs-drawer-inner {
    grid-template-columns: 1fr;
    padding: 28px 24px 36px;
  }
  .docs-tabs button { margin-right: 12px; font-size: 12px; }
  .mix-fab { right: 12px; bottom: 12px; }
}

@media print {
  header.top { position: static; }
  body { border-left-width: 3px; }
  a { color: inherit; text-decoration: none; }
  header.top nav { display: none; }
  .path-switch { display: none; }
  .docs-drawer { display: none !important; }
  .docs-scrim { display: none !important; }
  .mix-fab { display: none !important; }
  .lb { display: none !important; }
  figure img { cursor: default; }
}