@font-face {
  font-family: "OpenAI Sans";
  src: url("https://cdn.openai.com/common/fonts/openai-sans/v4/OpenAISans-Regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "OpenAI Sans";
  src: url("https://cdn.openai.com/common/fonts/openai-sans/v4/OpenAISans-Medium.woff2") format("woff2");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --orbit-page: #f8f8f8;
  --orbit-card: #fff;
  --orbit-text: #141414;
  --orbit-muted: #626262;
  --orbit-line: #dedede;
  --orbit-tint: #ededed;
  --orbit-action-hover: #333;
  --orbit-action-ink: #fff;
  --orbit-card-edge: rgb(20 20 20 / 5%);
  --orbit-card-shadow: 0 2px 12px rgb(20 20 20 / 5%);
  --orbit-radius-small: .5rem;
  --orbit-radius-medium: 1rem;
  --orbit-radius-large: 1.5rem;
  --orbit-grid-columns: 12;
  --orbit-grid-gap: 1.5rem;
  --orbit-main-span: 8;
  --orbit-half-span: 6;
  --orbit-chooser-span: 3;
  --orbit-section-gap: 3rem;
  --orbit-section-inset: 2rem;
  --orbit-heading-gap: 1.5rem;
  --orbit-copy-gap: 1rem;
  --orbit-small-gap: .75rem;
  font-family: "OpenAI Sans", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 100%;
  line-height: 1.65;
  letter-spacing: -.01em;
  color: var(--orbit-text);
  background: var(--orbit-page);
  -webkit-font-smoothing: antialiased;
}

@media (prefers-color-scheme: dark) {
  :root {
    --orbit-page: #171717;
    --orbit-card: #3e3e3e;
    --orbit-text: #f3f3f3;
    --orbit-muted: #bdbdbd;
    --orbit-line: #505050;
    --orbit-tint: #333;
    --orbit-action-hover: #ddd;
    --orbit-action-ink: #171717;
    --orbit-card-edge: rgb(243 243 243 / 8%);
    --orbit-card-shadow: 0 2px 12px rgb(0 0 0 / 14%);
  }
}

* { box-sizing: border-box; }
body { margin: 0; }
h1, h2, h3, p, figure, dl { margin: 0; }
img { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; }
button, summary { cursor: pointer; }
a { color: inherit; text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--orbit-text);
  outline-offset: 3px;
}

.orbit-page {
  width: min(100%, 70rem);
  margin-inline: auto;
  padding: 3rem 2.5rem 6.875rem;
  overflow-wrap: anywhere;
}

.skip-link { position: absolute; top: .75rem; left: 1rem; transform: translateY(-200%); }
.skip-link:focus { z-index: 2; transform: none; background: var(--orbit-page); padding: .5rem 1rem; }
.context { padding-bottom: 1.25rem; margin-bottom: var(--orbit-section-inset); border-bottom: 1px solid var(--orbit-line); font-size: .875rem; }
.context > p:first-child { font-weight: 500; }
.metadata { color: var(--orbit-muted); font-size: .875rem; letter-spacing: 0; }
.context .metadata { margin-top: .125rem; }
.page-heading { max-width: 44rem; margin-bottom: var(--orbit-section-inset); }
h1 { font-size: clamp(2.5rem, 4.5vw, 3.5rem); line-height: 1.08; letter-spacing: -.03em; font-weight: 500; text-wrap: balance; }
h2 { font-size: 1.5rem; line-height: 1.2; letter-spacing: -.02em; font-weight: 500; }
h3 { font-size: 1.125rem; line-height: 1.4; letter-spacing: -.02em; font-weight: 500; }
.lead { font-size: 1.125rem; line-height: 1.65; margin-top: var(--orbit-heading-gap); }
.section { margin-top: var(--orbit-section-gap); padding-top: var(--orbit-section-inset); border-top: 1px solid var(--orbit-line); }
.section > h2 { margin-bottom: var(--orbit-heading-gap); }
.section > p + p { margin-top: var(--orbit-copy-gap); }
.section > p { max-width: 44rem; }
/* Compose by content relationship. Open groups reserve one empty track. */
.content-grid, .layout-equal, .layout-main-support, .layout-open-support, .layout-split, .layout-chooser {
  display: grid;
  grid-template-columns: repeat(var(--orbit-grid-columns), minmax(0, 1fr));
  gap: var(--orbit-grid-gap);
  align-items: start;
}
:is(.content-grid, .layout-equal, .layout-main-support, .layout-open-support, .layout-split, .layout-chooser) > * { min-width: 0; }
.layout-primary > h2 { margin-bottom: var(--orbit-heading-gap); }
:is(.layout-primary, .layout-secondary) > h3 + p { margin-top: var(--orbit-small-gap); }
.content-grid > *, .layout-equal > * { grid-column: span var(--orbit-half-span); }
.layout-main-support > .layout-primary { grid-column: 1 / span var(--orbit-main-span); grid-row: 1; }
.layout-main-support > .layout-secondary { grid-column: calc(var(--orbit-main-span) + 1) / -1; grid-row: 1; }
.layout-open-support > .layout-primary { grid-column: 1 / span calc(var(--orbit-main-span) - 1); grid-row: 1; }
.layout-open-support > .layout-secondary { grid-column: calc(var(--orbit-main-span) + 1) / -1; grid-row: 1; }
.layout-split > .layout-primary { grid-column: 1 / span var(--orbit-half-span); grid-row: 1; }
.layout-split > .layout-secondary { grid-column: calc(var(--orbit-half-span) + 2) / -1; grid-row: 1; }
.layout-chooser > .layout-primary { grid-column: 1 / span var(--orbit-chooser-span); grid-row: 1; }
.layout-chooser > .layout-secondary { grid-column: calc(var(--orbit-chooser-span) + 1) / -1; grid-row: 1; }
:is(.layout-open-support, .layout-split) { position: relative; }
/* Optional rules occupy the reserved track; hiding them never changes spacing. */
.layout-open-support.layout-divided::before, .layout-split.layout-divided::before {
  content: "";
  grid-row: 1;
  justify-self: center;
  align-self: stretch;
  width: 1px;
  background: var(--orbit-line);
  pointer-events: none;
}
.layout-open-support.layout-divided::before { grid-column: var(--orbit-main-span); }
.layout-split.layout-divided::before { grid-column: calc(var(--orbit-half-span) + 1); }
.reading { width: calc((100% - 11 * var(--orbit-grid-gap)) / 12 * 8 + 7 * var(--orbit-grid-gap)); margin-inline: auto; }
.surface, .recommendation {
  background: var(--orbit-card);
  border: 1px solid var(--orbit-card-edge);
  border-radius: var(--orbit-radius-medium);
  box-shadow: var(--orbit-card-shadow);
  padding: clamp(1rem, 2vw, 1.5rem);
}
.surface > * + *, .recommendation > * + * { margin-top: var(--orbit-small-gap); }
.surface > .facts { margin-top: var(--orbit-heading-gap); }

.facts > div { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; padding: 1rem 0; border-bottom: 1px solid var(--orbit-line); }
.facts > div:first-child { padding-top: 0; }
.facts > div:last-child { border-bottom: 0; }
.facts dt { flex: 1 1 5.5rem; min-width: 0; color: var(--orbit-muted); }
.facts dd { flex: 2.5 1 12rem; min-width: 0; margin: 0; }

.item-list { margin: 0; padding-left: 1.5rem; }
.item-list > li { padding: 1.25rem 0 1.25rem .5rem; border-bottom: 1px solid var(--orbit-line); }
.item-list > li:first-child { padding-top: 0; }
.item-list > li:last-child { padding-bottom: 0; border-bottom: 0; }
.item-list p, .timeline p { margin-top: var(--orbit-small-gap); max-width: 44rem; }
.item-list .metadata { margin-top: .375rem; }

.feature-image { margin-block: var(--orbit-section-inset); }
.feature-image img { width: 100%; aspect-ratio: 2.8; object-fit: cover; border-radius: var(--orbit-radius-medium); }
.feature-image figcaption { color: var(--orbit-muted); font-size: .875rem; line-height: 1.5; margin-top: .625rem; }
.product-image, .feature-image .product-image { width: 100%; max-height: 18rem; object-fit: contain; }

.table-scroll { overflow-x: auto; border: 1px solid var(--orbit-line); border-radius: var(--orbit-radius-medium); }
.comparison { width: 100%; border-collapse: collapse; text-align: left; font-size: .875rem; }
.comparison caption { text-align: left; font-size: 1rem; font-weight: 500; padding: 1rem 1.25rem; }
.comparison th, .comparison td { padding: 1rem 1.25rem; border-bottom: 1px solid var(--orbit-line); vertical-align: top; min-width: 9rem; }
.comparison th { font-weight: 500; }
.comparison thead, .comparison .recommended { background: var(--orbit-tint); }
.comparison tbody tr:last-child > * { border-bottom: 0; }

.timeline { margin: 0; padding: 0; list-style: none; }
.timeline > li { display: grid; grid-template-columns: minmax(3.5rem, 1fr) minmax(0, 7fr); gap: 1.25rem; }
.timeline > li > :first-child { font-size: .875rem; color: var(--orbit-muted); font-variant-numeric: tabular-nums; }
.timeline > li > div { padding: 0 0 var(--orbit-section-inset) 1.25rem; border-left: 1px solid var(--orbit-line); }
.timeline > li:last-child > div { padding-bottom: 0; }

.checklist { list-style: none; padding: 0; margin: 0; }
.checklist li + li { border-top: 1px solid var(--orbit-line); }
.checklist label { display: flex; align-items: flex-start; gap: .75rem; padding: .875rem 0; cursor: pointer; }
.checklist input { width: 1.125rem; height: 1.125rem; flex: none; margin: .25rem 0 0; accent-color: var(--orbit-text); }
.checklist input:checked + span { color: var(--orbit-muted); text-decoration: line-through; }

.sources { max-width: 44rem; }
.sources summary { width: fit-content; padding-block: .375rem; font-weight: 500; }
.sources > :not(summary) { margin-top: var(--orbit-copy-gap); }
.sources ul { padding-left: 1.25rem; }
.sources li + li { margin-top: .5rem; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem; margin-top: var(--orbit-heading-gap); }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 2.75rem; padding: .625rem 1.125rem; border: 1px solid var(--orbit-text); border-radius: var(--orbit-radius-small); background: var(--orbit-text); color: var(--orbit-action-ink); font-weight: 500; line-height: 1.4; text-align: center; text-decoration: none; }
.button:hover { background: var(--orbit-action-hover); text-decoration: none; }
.button-secondary { background: var(--orbit-card); color: var(--orbit-text); border-color: var(--orbit-line); }
.button-secondary:hover { background: var(--orbit-tint); }
.button-soft { background: var(--orbit-tint); color: var(--orbit-text); border-color: transparent; }
.button-soft:hover { background: var(--orbit-line); }
.button:disabled { cursor: default; opacity: .5; }

.field { display: grid; gap: .5rem; max-width: 36rem; }
.field + .field { margin-top: 1.25rem; }
.field > label, .choice-group legend { font-weight: 500; }
.control { display: block; width: 100%; min-width: 0; min-height: 2.75rem; padding: .625rem .875rem; border: 1px solid #8c8c8c; border-radius: var(--orbit-radius-small); background: var(--orbit-card); color: var(--orbit-text); }
.control::placeholder { color: var(--orbit-muted); opacity: 1; }
textarea.control { resize: vertical; min-height: 7rem; }
.choice-group { min-width: 0; margin: 0; padding: 0; border: 0; }
.choice-group + .choice-group { margin-top: 1.5rem; }
.choice-group legend { padding: 0; margin-bottom: .5rem; }
.choice { display: flex; align-items: center; gap: .75rem; min-height: 2.75rem; padding: .5rem 0; cursor: pointer; }
.choice input { flex: none; width: 1.125rem; height: 1.125rem; margin: 0; accent-color: var(--orbit-text); }
.switch input { appearance: none; position: relative; width: 2.5rem; height: 1.5rem; border: 1px solid var(--orbit-muted); border-radius: 2rem; background: var(--orbit-muted); cursor: pointer; }
.switch input::before { content: ""; position: absolute; width: 1rem; height: 1rem; left: .1875rem; top: .1875rem; border-radius: 50%; background: var(--orbit-action-ink); }
.switch input:checked { background: var(--orbit-text); border-color: var(--orbit-text); }
.switch input:checked::before { transform: translateX(1rem); }
.badge { display: inline-block; padding: .125rem .625rem; border-radius: .375rem; background: var(--orbit-tint); font-size: .875rem; font-weight: 500; }
.notice { margin-top: 1rem; padding: 1rem 1.25rem; border: 1px solid var(--orbit-line); border-radius: var(--orbit-radius-medium); }
.notice > p { margin-top: .5rem; }

/* Optional photograph header. Supply a relevant image, never a decorative placeholder. */
.image-page { overflow-wrap: anywhere; }
.image-context { min-height: 4rem; width: min(100%, 70rem); margin-inline: auto; padding: 1.25rem 2.5rem; font-size: .875rem; font-weight: 500; }
.image-hero { position: relative; isolation: isolate; display: grid; align-items: end; min-height: 26.25rem; margin-inline: 1.5rem; border-radius: var(--orbit-radius-large); overflow: hidden; color: #fff; background: #333; }
.image-hero > img { position: absolute; z-index: -2; width: 100%; height: 100%; object-fit: cover; }
.image-hero::before { content: ""; position: absolute; z-index: -1; inset: 0; background: linear-gradient(180deg, rgb(0 0 0 / 15%), rgb(0 0 0 / 75%)); }
.image-hero-copy { padding: 2rem 3rem 3.75rem; text-align: center; }
.image-hero h1 { max-width: 48.75rem; margin-inline: auto; font-size: clamp(2.5rem, 4.5vw, 4rem); line-height: 1.05; }
.image-hero p { max-width: 42.5rem; margin: 1rem auto 0; font-size: 1.125rem; }

@media (forced-colors: active) {
  .switch input { appearance: auto; }
  .switch input::before { display: none; }
}

@media (max-width: 900px) {
  :root { --orbit-grid-columns: 8; --orbit-grid-gap: 1.25rem; --orbit-main-span: 5; --orbit-half-span: 4; }
  .orbit-page { padding: 2rem 1.75rem 6.25rem; }
  .image-context { padding-inline: 1.75rem; }
  .reading { width: auto; }
}

@media (max-width: 760px) {
  :is(.content-grid, .layout-equal, .layout-main-support, .layout-open-support, .layout-split, .layout-chooser) { row-gap: 2rem; }
  :is(.content-grid, .layout-equal) > *,
  :is(.layout-main-support, .layout-open-support, .layout-split, .layout-chooser) > :is(.layout-primary, .layout-secondary) { grid-column: 1 / -1; grid-row: auto; }
  .layout-open-support.layout-divided::before, .layout-split.layout-divided::before { display: none; }
  :is(.layout-open-support, .layout-split).layout-divided > .layout-secondary { border-top: 1px solid var(--orbit-line); padding-top: 1.5rem; }
}

@media (max-width: 680px) {
  :root { --orbit-grid-columns: 4; --orbit-grid-gap: 1rem; --orbit-section-gap: 2rem; --orbit-section-inset: 1.5rem; --orbit-heading-gap: 1.25rem; }
  .orbit-page { padding: 1.5rem 1.25rem 6.25rem; }
  .context { padding-bottom: .75rem; }
  h2 { font-size: 1.375rem; }
  .lead { font-size: 1.0625rem; }
  .feature-image img { aspect-ratio: 1.65; }
  .timeline > li { grid-template-columns: minmax(2.75rem, 1fr) minmax(0, 5fr); gap: .75rem; }
  .timeline > li > div { padding-left: 1rem; }
  .image-context { padding-inline: 1.25rem; }
  .image-hero { min-height: 20rem; margin-inline: .75rem; border-radius: var(--orbit-radius-medium); }
  .image-hero-copy { padding-inline: 2rem; }
  .image-hero h1 { font-size: 2.5rem; }
}