/* SPDX-License-Identifier: GPL-2.0-only */
:root {
  --bg: oklch(1 0 0);
  --surface: oklch(.96 0 0);
  --ink: oklch(.22 .012 35);
  --muted: oklch(.45 .015 35);
  --primary: oklch(.48 .18 35);
  --accent: oklch(.25 .07 260);
  --line: oklch(.83 0 0);
  --wash: oklch(.95 .025 35);
}
* { box-sizing: border-box; }
html { scroll-padding-top: 2rem; }
body { margin: 0; color: var(--ink); background: var(--bg); font: 16px/1.75 Verdana, sans-serif; }
a { color: var(--primary); text-underline-offset: .23em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--primary); outline-offset: 5px; }
.skip { position: absolute; left: 1rem; top: -100px; background: white; padding: .7rem 1rem; z-index: 2; }
.skip:focus { top: 1rem; }
.wrap { width: min(1180px, calc(100% - 64px)); margin: auto; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; justify-content: space-between; align-items: center; gap: 1rem 2rem; min-height: 94px; }
.brand { display: inline-flex; align-items: center; gap: .75rem; color: var(--ink); text-decoration: none; font: 700 25px/1 Arial, sans-serif; }
.brand svg { width: 34px; height: 34px; color: var(--primary); }
nav { display: flex; flex-wrap: wrap; gap: .8rem 1.7rem; font-size: 13px; }
nav a { color: var(--ink); text-decoration: none; }
nav a[aria-current] { color: var(--primary); text-decoration: underline; }
h1, h2, h3 { font-family: Arial, sans-serif; line-height: 1.08; letter-spacing: -.035em; margin: 0; }
h1 { font-size: clamp(46px, 5.7vw, 76px); font-weight: 750; }
h2 { font-size: clamp(30px, 3.5vw, 43px); }
h3 { font-size: 23px; letter-spacing: -.02em; }
p { max-width: 70ch; }
.hero > *, .split > * { min-width: 0; }
.hero { display: grid; grid-template-columns: 1fr 1.05fr; align-items: center; gap: 3rem; padding: 76px 0 68px; }
.kicker { color: var(--primary); font-size: 13px; font-weight: bold; margin: 0 0 1.5rem; }
.lead { font-size: 17px; line-height: 1.8; color: var(--muted); margin: 1.7rem 0; max-width: 46ch; }
.actions { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; align-items: center; margin-top: 2rem; font-size: 14px; }
.button { padding: .8rem 1.2rem; background: var(--primary); color: white; text-decoration: none; font-weight: bold; }
.button:hover { background: var(--ink); }
figure { margin: 0; }
.diagram { display: block; width: 100%; height: auto; }
figcaption { color: var(--muted); font-size: 12px; margin-top: .8rem; text-align: center; }
.status { background: var(--wash); border-left: 4px solid var(--primary); padding: 1.15rem 1.5rem; font-size: 14px; }
.status p { margin: 0; max-width: none; }
.section { padding: 76px 0; border-bottom: 1px solid var(--line); }
.split { display: grid; grid-template-columns: .85fr 1.15fr; gap: 4rem; }
.section p { color: var(--muted); }
.section .intro { font-size: 17px; }
pre { padding: 1.5rem; margin: 1.4rem 0; background: var(--accent); color: white; overflow-x: auto; font-size: 13px; line-height: 1.9; border-radius: 2px; }
code { font-family: ui-monospace, Consolas, monospace; font-size: .95em; }
:not(pre) > code { background: var(--surface); padding: .12rem .3rem; overflow-wrap: anywhere; }
.evidence { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; padding-top: 1rem; }
.evidence strong { display: block; font-family: Arial, sans-serif; font-size: 32px; line-height: 1.2; letter-spacing: -.03em; }
.evidence span { display: block; color: var(--muted); font-size: 12px; margin-top: .4rem; }
.doclinks { display: grid; grid-template-columns: 1fr 1fr; gap: 0 3rem; margin-top: 2rem; }
.doclinks a { display: flex; flex-direction: column; border-top: 1px solid var(--line); padding: 1.4rem 0; text-decoration: none; }
.doclinks a strong { font-size: 16px; }
.doclinks a span { color: var(--muted); font-size: 13px; margin-top: .4rem; }
.doclinks a:hover strong { text-decoration: underline; }
.roadmap { list-style: none; padding: 0; margin: 2rem 0 0; }
.roadmap li { display: grid; grid-template-columns: 125px 1fr; gap: 1.3rem; padding: 1rem 0; border-top: 1px solid var(--line); }
.roadmap b { font-size: 12px; color: var(--primary); padding-top: .2rem; }
.roadmap p { margin: .2rem 0 0; font-size: 14px; }
footer { padding: 2.3rem 0; color: var(--muted); font-size: 12px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }
footer p { margin: 0; }
.guide { max-width: 820px; padding-top: 65px; padding-bottom: 65px; }
.guide h1 { font-size: clamp(42px, 5vw, 62px); }
.guide h2 { font-size: 30px; margin-top: 3.3rem; }
.guide h3 { margin-top: 2rem; }
.guide p, .guide li { font-size: 15px; }
.guide .lead { font-size: 18px; max-width: 62ch; }
.guide .contents { display: flex; flex-wrap: wrap; gap: .6rem 1.5rem; padding: 1rem 0; border-block: 1px solid var(--line); font-size: 13px; }
.guide table { border-collapse: collapse; width: 100%; margin: 1.5rem 0; font-size: 13px; }
.guide td, .guide th { text-align: left; padding: .75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.guide th { background: var(--surface); }
@media (max-width: 800px) {
  .hero, .split { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero { padding: 48px 0; }
  .hero figure { max-width: 570px; }
  .lead { max-width: 60ch; }
  .section { padding: 50px 0; }
  header .wrap { padding-block: 1.4rem; flex-wrap: wrap; }
}
@media (max-width: 480px) {
  .wrap { width: calc(100% - 36px); }
  nav { gap: .6rem 1rem; font-size: 12px; }
  .doclinks { grid-template-columns: 1fr; }
  .evidence strong { font-size: 26px; }
  .roadmap li { grid-template-columns: 1fr; gap: .4rem; }
  .status { padding: 1rem; }
  pre { padding: 1rem; font-size: 12px; }
}

.diagram-mobile { display: none; }
@media (max-width: 480px) {
  .diagram-desktop { display: none; }
  .diagram-mobile { display: block; }
  .guide table { font-size: 12px; table-layout: fixed; }
  .guide td { overflow-wrap: anywhere; }
}

.plan .milestones { display: flex; flex-wrap: wrap; gap: .6rem; margin: 2rem 0 1.5rem; }
.plan .milestones button { font: inherit; font-size: 13px; padding: .55rem .9rem; border: 1px solid var(--line); background: white; color: var(--ink); cursor: pointer; }
.plan .milestones button[aria-pressed="true"] { border-color: var(--primary); color: var(--primary); font-weight: bold; }
.plan .milestones button:focus-visible, .plan .box:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }
.plan .flow { display: grid; grid-template-columns: 1fr auto 1.15fr auto 1fr; gap: .8rem; align-items: start; }
.plan .column h2 { font-size: 15px; margin: 0 0 .8rem; letter-spacing: 0; color: var(--muted); }
.plan .flow-arrow { color: var(--line); font-size: 28px; padding-top: 2.6rem; }
.plan .box { display: block; width: 100%; text-align: left; font: inherit; font-size: 14px; line-height: 1.4; padding: .7rem .85rem; margin: 0 0 .6rem; border: 1px solid var(--line); background: white; color: var(--ink); cursor: pointer; }
.plan .box span { display: block; font-size: 12px; color: var(--muted); margin-top: .15rem; }
.plan .box:hover { border-color: var(--ink); }
.plan .box.done { background: oklch(.95 .04 160); border-color: oklch(.5 .12 160); }
.plan .box.done span { color: oklch(.38 .09 160); }
.plan .box.dim { opacity: .3; }
.plan .box.selected { border: 2px solid var(--primary); padding: calc(.7rem - 1px) calc(.85rem - 1px); }
.plan .legend { font-size: 13px; color: var(--muted); margin: .5rem 0 0; }
.plan .swatch { display: inline-block; width: 12px; height: 12px; border: 1px solid var(--line); vertical-align: -1px; margin: 0 .35rem 0 1rem; }
.plan .swatch:first-child { margin-left: 0; }
.plan .swatch.done { background: oklch(.95 .04 160); border-color: oklch(.5 .12 160); }
.plan .detail { background: var(--surface); padding: 1.1rem 1.4rem; margin-top: 1.5rem; min-height: 4.5rem; font-size: 15px; }
.plan .detail p { margin: .4rem 0 0; max-width: none; }
@media (max-width: 800px) {
  .plan .flow { grid-template-columns: 1fr; }
  .plan .flow-arrow { padding: 0; text-align: center; transform: rotate(90deg); line-height: 1; }
}