:root {
  --ink: #1a1f1c;
  --paper: #fafaf8;
  --secondary: #5a625c;
  --border: #e3e6e1;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
body { margin: 0; }
header, main, footer { width: min(660px, calc(100% - 48px)); margin: auto; }
header { display: flex; align-items: center; justify-content: space-between; padding: 32px 0; }
a { color: inherit; text-underline-offset: 4px; }
.brand { display: inline-flex; align-items: center; min-height: 44px; font-size: 22px; font-weight: 600; text-decoration: none; }
.version { font: 12px ui-monospace, "SF Mono", monospace; color: var(--secondary); }
.letter { padding: 40px 0 32px; }
h1 { font-size: clamp(26px, 4vw, 34px); font-weight: 500; line-height: 1.2; margin: 0 0 32px; }
.letter p { font: 20px/1.65 Georgia, "Times New Roman", serif; margin: 0 0 24px; }
.letter .signature { margin-top: 32px; }
.signature span { display: block; font: 13px/1.6 system-ui, sans-serif; color: var(--secondary); margin-top: 4px; }
.beta { border-top: 1px solid var(--border); padding: 28px 0; font-size: 15px; line-height: 1.6; }
.download-links { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; padding: 0 0 32px; font-size: 14px; }
.download-links a { display: inline-flex; align-items: center; min-height: 44px; }
.app-link { background: var(--border); color: var(--secondary); padding: 8px 16px; border: 0; border-radius: 6px; font: inherit; min-height: 44px; cursor: not-allowed; }
.app-link[href] { background: var(--ink); color: var(--paper); cursor: pointer; text-decoration: none; }
.app-link[href]:hover { background: var(--secondary); }
.app-link[href]:active { transform: translateY(1px); }
h2 { font-size: 17px; font-weight: 600; margin: 0; }
.beta p { margin: 12px 0 20px; }
summary { cursor: pointer; min-height: 44px; padding: 10px 0; }
.details-body { color: var(--secondary); }
footer { padding: 12px 0 40px; color: var(--secondary); font-size: 13px; }
footer a { display: inline-flex; align-items: center; min-height: 44px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
.skip { position: absolute; top: -100px; }
.skip:focus { top: 8px; background: var(--paper); padding: 12px; }
@media (max-width: 640px) {
  header { padding: 20px 0; }
  .letter { padding-top: 24px; }
  .letter p { font-size: 19px; }
}
/* Release metadata is separate from the letter; no additional marketing copy. */
.release-details { margin: 16px 0 32px; font-size: 0.875rem; color: var(--secondary, #62655e); }
.release-details p { margin: 8px 0; }
.release-details a { display: inline-flex; align-items: center; min-height: 44px; }
.release-details [hidden] { display: none; }