:root {
  /* Restrained, evidence-led palette. The accent is reserved for the one
     action this page exists for; it is not a decorative colour. */
  --ink: #172026;
  --ink-soft: #40554a;
  --ink-faint: #52645b;
  --surface: #f6f8f5;
  --surface-raised: #ffffff;
  --rule: #dce4de;
  --rule-strong: #c9d5ce;
  --accent: #23603f;
  --accent-hover: #1a4b31;
  --accent-ink: #ffffff;
  --accent-wash: #e8efe9;
  --focus: #2f7255;

  color: var(--ink);
  background: var(--surface);
  color-scheme: light;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  accent-color: var(--accent);
  caret-color: var(--accent);
  scrollbar-color: var(--rule-strong) var(--surface);
}

/* The use scene is an accountant at a desktop during working hours, so light
   is the committed default. Dark is honoured for people whose machine is set
   that way, using the same palette rather than a second visual language. */
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7ede8;
    --ink-soft: #a9bcb0;
    --ink-faint: #93a89b;
    --surface: #10161a;
    --surface-raised: #182126;
    --rule: #263238;
    --rule-strong: #33444c;
    --accent: #6fbf90;
    --accent-hover: #8ed0a8;
    --accent-ink: #0c1317;
    --accent-wash: #1c2a24;
    --focus: #6fbf90;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body { margin: 0; }

a { color: inherit; }

::selection { background: var(--accent-wash); color: var(--ink); }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 3px; }

.page {
  width: min(100% - 32px, 960px);
  margin: 0 auto;
  padding: 24px 0 96px;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 20px;
}

.wordmark { font-size: 19px; font-weight: 750; letter-spacing: -0.015em; text-decoration: none; }
.quiet-link { color: var(--ink-soft); font-size: 14px; }
.quiet-link:hover { color: var(--ink); }

.intro { max-width: 760px; padding: clamp(56px, 10vw, 104px) 0 64px; }

h1, h2 { letter-spacing: -0.025em; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(38px, 6.4vw, 58px); line-height: 1.04; }
h2 { font-size: 25px; line-height: 1.18; }

.lede { font-size: 19px; line-height: 1.55; margin: 26px 0 0; max-width: 62ch; }
.support-line { color: var(--ink-soft); line-height: 1.5; margin: 20px 0 0; max-width: 68ch; }

.release-panel, .setup, .plain-language, .aftercare { border-top: 1px solid var(--rule-strong); padding: 56px 0 40px; }
.section-heading { align-items: start; display: flex; gap: 24px; justify-content: space-between; }
.release-status { color: var(--ink-soft); font-size: 14px; font-variant-numeric: tabular-nums; line-height: 1.45; margin: 3px 0 0; text-align: right; }

.channel-note, .verification-note { color: var(--ink-soft); line-height: 1.55; margin: 16px 0 0; max-width: 70ch; }

/* Downloading is the single job of this page, so it is the only element that
   carries the accent as a fill. */
.downloads { display: grid; gap: 12px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 28px 0 16px; }
.download-option {
  align-content: start;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 10px;
  color: var(--accent-ink);
  display: grid;
  gap: 6px;
  min-height: 116px;
  padding: 20px;
  text-decoration: none;
  transition: background-color 140ms ease-out, box-shadow 140ms ease-out;
}
.download-option span { font-size: 14px; opacity: 0.85; }
.download-option strong { font-size: 22px; letter-spacing: -0.02em; }
.download-option small { line-height: 1.45; opacity: 0.85; }
.download-option:not([aria-disabled="true"]):hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 6px 16px -6px rgb(23 32 38 / 45%);
}
.download-option[aria-disabled="true"] {
  background: transparent;
  border-color: var(--rule-strong);
  border-style: dashed;
  color: var(--ink-faint);
  cursor: not-allowed;
}
.download-option[aria-disabled="true"] span,
.download-option[aria-disabled="true"] small { opacity: 1; }

ol { line-height: 1.6; margin: 28px 0 0; max-width: 70ch; padding-left: 23px; }
li + li { margin-top: 12px; }
code {
  background: var(--accent-wash);
  border-radius: 4px;
  font-size: 0.9em;
  font-variant-numeric: tabular-nums;
  padding: 0.12em 0.32em;
}

.aside { margin: 16px 0 0; max-width: 70ch; }
.aside > summary {
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 650;
  line-height: 1.5;
  padding: 2px 0;
}
.aside > summary:hover { color: var(--ink); }
.aside > p { color: var(--ink-soft); line-height: 1.55; margin: 10px 0 0; }

.port-guide { border-top: 1px solid var(--rule); margin-top: 36px; max-width: 680px; padding-top: 28px; }
.port-guide label { display: block; font-weight: 700; margin-bottom: 10px; }
.port-guide input {
  background: var(--surface-raised);
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  color: var(--ink);
  font: inherit;
  font-variant-numeric: tabular-nums;
  min-height: 44px;
  padding: 0 12px;
  width: 160px;
}
.port-guide input[aria-invalid="true"] { border-color: #a8341f; }
.port-guide p { color: var(--ink-soft); line-height: 1.55; margin: 14px 0 0; max-width: 66ch; }

.plain-language > h2 { max-width: 30ch; }
.plain-language > p { margin-top: 20px; }
.plain-language p, .aftercare p { line-height: 1.6; margin: 0; max-width: 66ch; }
.aftercare p + p { margin-top: 12px; }

@media (max-width: 640px) {
  .page { width: min(100% - 24px, 960px); }
  .intro { padding: 48px 0 44px; }
  .release-panel, .setup, .plain-language, .aftercare { padding: 40px 0 32px; }
  .section-heading { display: block; }
  .release-status { margin-top: 14px; text-align: left; }
  .downloads { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}