@charset "UTF-8";

:root {
  color-scheme: light;
  --paper: #f8f9f5;
  --ink: #172a25;
  --muted: #59665e;
  --accent: #24634b;
  --line: #d8dfd5;
  --panel: #eaf0e6;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 2rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-underline-offset: .24em; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
::selection { background: #c8ddc0; color: var(--ink); }
.site-shell { width: min(100% - 6rem, 1120px); margin-inline: auto; }
.skip-link { position: absolute; top: .7rem; left: 1rem; z-index: 2; padding: .75rem 1rem; background: var(--ink); color: white; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.site-header { display: flex; justify-content: space-between; align-items: center; gap: 2rem; min-height: 109px; border-bottom: 1px solid var(--line); }
.wordmark { display: inline-flex; align-items: center; gap: .6rem; font-family: var(--mono); font-size: 1.15rem; font-weight: 600; letter-spacing: -.06em; text-decoration: none; }
.brand-mark { width: 31px; height: 31px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.site-header nav { display: flex; gap: 2.3rem; font-size: .875rem; font-weight: 500; }
.site-header nav a { display: inline-flex; align-items: center; gap: .6rem; min-height: 44px; text-decoration: none; }
.site-header nav a:hover { text-decoration: underline; }

.hero { padding-block: 6.4rem 6.6rem; }
.eyebrow { margin: 0; font-family: var(--mono); font-size: .69rem; line-height: 1.6; font-weight: 500; letter-spacing: .12em; text-transform: uppercase; }
.hero > .eyebrow { display: flex; align-items: center; gap: .65rem; color: var(--accent); }
.status-dot { width: 6px; height: 6px; flex-shrink: 0; border-radius: 50%; background: var(--accent); }
h1 { margin: 1.8rem 0 1.7rem; font-size: clamp(2.8rem, 6.5vw, 5.4rem); font-weight: 500; letter-spacing: -.065em; line-height: 1.07; }
h1 span { color: var(--accent); }
.hero-intro { max-width: 620px; margin: 0; color: var(--muted); font-size: 1.13rem; line-height: 1.75; text-wrap: pretty; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1.4rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 1.75rem; min-height: 52px; padding: .9rem 1.25rem; border: 1px solid var(--accent); border-radius: 4px; background: var(--accent); color: white; font-size: .9rem; font-weight: 500; text-decoration: none; }
.button:hover { background: var(--ink); border-color: var(--ink); }
.document-note { display: inline-flex; gap: .65rem; color: var(--muted); font-family: var(--mono); font-size: .7rem; }

.format-section { padding-block: 3.25rem 4.25rem; border-top: 1px solid var(--line); }
.section-heading > .eyebrow { color: var(--muted); }
h2 { margin: .75rem 0 0; font-size: clamp(1.65rem, 3vw, 2.15rem); font-weight: 500; letter-spacing: -.04em; line-height: 1.2; }
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.7rem; margin-top: 2.65rem; }
.feature-index { color: var(--accent); font-family: var(--mono); font-size: .7rem; }
.feature h3 { margin: 1.2rem 0 .65rem; font-size: 1rem; font-weight: 600; letter-spacing: -.02em; line-height: 1.4; }
.feature p { margin: 0; color: var(--muted); font-size: .92rem; line-height: 1.8; text-wrap: pretty; }

.specification-section { padding-block: 3.25rem 5rem; border-top: 1px solid var(--line); }
.specification-heading > p:last-child { max-width: 590px; margin: 1rem 0 0; color: var(--muted); font-size: .96rem; line-height: 1.75; }
.specification-card { display: flex; justify-content: space-between; align-items: end; gap: 2rem; padding: 2rem 2.25rem; margin-top: 2rem; border: 1px solid #ccd8c5; border-radius: 5px; background: var(--panel); text-decoration: none; }
.specification-card:hover { border-color: var(--accent); }
.specification-card .eyebrow { color: var(--accent); font-size: .64rem; letter-spacing: .1em; }
.specification-card h3 { margin: 1.1rem 0 .8rem; font-size: 2.05rem; font-weight: 500; letter-spacing: -.055em; line-height: 1.2; }
.version { margin-left: .25rem; color: var(--accent); }
.specification-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem; margin: 0; color: var(--muted); font-size: .8rem; line-height: 1.6; }
.specification-card-action { display: inline-flex; align-items: center; flex-shrink: 0; gap: 1rem; min-height: 44px; font-size: .875rem; font-weight: 500; }
.specification-card:hover .specification-card-action { text-decoration: underline; text-underline-offset: .24em; }
.archive { margin-top: 1.25rem; }
.archive summary { display: flex; align-items: center; gap: .8rem; min-height: 64px; padding: .65rem 0; border-bottom: 1px solid var(--line); font-size: .85rem; font-weight: 500; cursor: pointer; list-style: none; }
.archive summary::-webkit-details-marker { display: none; }
.archive-count { color: var(--muted); font-family: var(--mono); font-size: .65rem; font-weight: 400; }
.archive-toggle { margin-left: auto; padding-inline: .25rem; font-size: 1.4rem; font-weight: 300; }
.archive[open] .archive-toggle { transform: rotate(45deg); }
.archive-note { margin: 1.2rem 0 .5rem; color: var(--muted); font-size: .85rem; line-height: 1.7; }
.archive-list { margin: 0; padding: 0; list-style: none; }
.archive-list a { display: flex; justify-content: space-between; align-items: center; gap: 1rem; min-height: 54px; border-bottom: 1px solid var(--line); font-size: .85rem; text-decoration: none; }
.archive-list a:hover { color: var(--accent); text-decoration: underline; }
.archive-filetype { display: inline-flex; gap: 1rem; color: var(--muted); font-family: var(--mono); font-size: .68rem; }
.site-footer { display: flex; justify-content: space-between; gap: 1rem 2rem; padding-block: 1.75rem 2.5rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .75rem; line-height: 1.7; }
.site-footer p { margin: 0; }

@media (max-width: 760px) {
  .site-shell { width: calc(100% - 3rem); }
  .site-header { min-height: 88px; gap: 1rem; }
  .site-header nav { gap: 1.25rem; font-size: .8rem; }
  .hero { padding-block: 4rem 4.5rem; }
  h1 { font-size: clamp(2.65rem, 7.8vw, 4rem); }
  .hero-intro { font-size: 1.02rem; }
  .features { gap: 1.5rem; }
  .feature h3 { font-size: .95rem; }
  .specification-card { padding: 1.75rem; }
  .specification-card-action { gap: .6rem; }
}

@media (max-width: 560px) {
  .site-shell { width: calc(100% - 2.5rem); }
  .site-header { flex-wrap: wrap; gap: .2rem 1rem; padding-block: 1rem; }
  .wordmark { font-size: 1.02rem; }
  .brand-mark { width: 26px; height: 26px; }
  .site-header nav { gap: 1rem; font-size: .75rem; }
  .hero { padding-block: 3.5rem 3.75rem; }
  .hero > .eyebrow { font-size: .59rem; letter-spacing: .09em; }
  h1 { margin-block: 1.5rem; font-size: clamp(2rem, 8vw, 2.8rem); letter-spacing: -.06em; }
  .hero-intro { font-size: 1rem; line-height: 1.75; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 1rem; margin-top: 1.65rem; }
  .format-section, .specification-section { padding-block: 2.5rem 3rem; }
  .features { grid-template-columns: 1fr; gap: 1.8rem; margin-top: 2rem; }
  .feature { display: grid; grid-template-columns: 2.2rem minmax(0, 1fr); align-items: baseline; column-gap: .5rem; }
  .feature h3 { margin: 0 0 .5rem; font-size: 1rem; }
  .feature p { grid-column: 2; }
  .specification-card { align-items: flex-start; flex-direction: column; gap: 1rem; padding: 1.5rem; }
  .specification-meta { gap: .4rem; font-size: .74rem; }
  .specification-card-action { justify-content: space-between; width: 100%; }
  .archive summary { gap: .6rem; }
  .site-footer { flex-direction: column; gap: .5rem; padding-block: 1.5rem 2rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media print {
  body { background: white; color: black; }
  .site-shell { width: 100%; }
  .skip-link, .site-header nav, .hero-actions, .archive { display: none; }
  .site-header { min-height: 60px; }
  .hero { padding-block: 2rem; }
  h1 { font-size: 36pt; }
  .format-section, .specification-section { padding-block: 1.5rem; }
  .specification-card { break-inside: avoid; padding: 1rem; }
  .specification-card-action { display: none; }
}