:root {
  --bg: #ffffff;
  --panel: #f5f7fa;
  --line: #d0d7de;
  --text: #1f2328;
  --muted: #59636e;
  /* The brand's brass (brand/README.md); the charts keep their blue. */
  --accent: #9a6110;
  --code-bg: #f6f8fa;
  --hero: #0d1117;
  --hero-text: #e6edf3;
  --hero-muted: #9198a1;
  --hero-accent: #e3a33b;
  /* The protocol page's diagrams: data in the charts' blue, the
     container's structure in greys. */
  --data: #0969da;
  --data-soft: #ddf4ff;
  --data-ink: #0550ae;
  --structure: #424a53;
  --structure-soft: #8c959f;
  --pad: #eaeef2;
  --warn-soft: #fff8eb;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --panel: #161b22;
    --line: #30363d;
    --text: #e6edf3;
    --muted: #9198a1;
    --accent: #e3a33b;
    --code-bg: #161b22;
    --hero: #010409;
    --data: #4493f8;
    --data-soft: #0d2a4d;
    --data-ink: #9ecbff;
    --structure: #8c959f;
    --structure-soft: #57606a;
    --pad: #21262d;
    --warn-soft: #2b2111;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); }
code, pre { font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
code { font-size: 0.9em; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

.hero { background: var(--hero); color: var(--hero-text); padding: 56px 0 40px; }
.hero .name { margin: 0; }
.hero .name img { height: 36px; width: auto; }
.hero h1 { margin: 8px 0 16px; font-size: clamp(28px, 5vw, 44px); line-height: 1.15; max-width: 22ch; }
.hero .lede { margin: 0; max-width: 60ch; color: var(--hero-text); font-size: 18px; }
.hero .status { display: inline-block; margin: 20px 0 0; padding: 4px 12px; border: 1px solid var(--hero-muted); border-radius: 999px; color: var(--hero-muted); font-size: 14px; }
.hero .links { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 24px; }
.hero .links a { color: var(--hero-accent); text-decoration: none; font-weight: 600; }
.hero .links a:hover { text-decoration: underline; }
.hero .shot { margin-top: 32px; }
.hero figcaption { color: var(--hero-muted); }

figure { margin: 24px 0 0; }
.shot img { border-radius: 8px; border: 1px solid var(--line); margin: 0 auto; }
.hero .shot img { border-color: #30363d; }
.shot.narrow img { max-width: 640px; width: 100%; }
figcaption { margin-top: 8px; font-size: 14px; color: var(--muted); text-align: center; }

main section { padding: 48px 16px 8px; }
h2 { font-size: 28px; margin: 0 0 16px; }
h3 { font-size: 19px; margin: 32px 0 8px; }

.reasons { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.reasons article { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 4px 20px 16px; }
.reasons h3 { margin-top: 16px; }
.reasons p { margin: 0; color: var(--text); }

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.5;
}
pre code { font-size: inherit; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; vertical-align: top; padding: 8px 12px 8px 0; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
td:first-child { white-space: nowrap; }
@media (max-width: 600px) {
  td:first-child { white-space: normal; }
}

footer { padding-top: 32px; padding-bottom: 48px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); margin-top: 48px; }

/* The protocol page. */
.step { margin: 0; font-size: 13px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.step + h2 { margin-top: 4px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 16px; }
.card { border: 1px solid var(--line); border-radius: 8px; padding: 16px; min-width: 0; }
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.field { display: flex; justify-content: space-between; font-weight: 700; }
.field code { color: var(--muted); font-weight: 400; }
.value { font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; color: var(--data); overflow-wrap: anywhere; margin: 6px 0; }
.note { font-size: 14px; color: var(--muted); margin: 0; }
.aside { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px 20px; margin-top: 16px; }
.aside h3 { margin: 0 0 8px; font-size: 17px; }
.steps3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 12px 0; }
.steps3 span { display: block; font-size: 13px; color: var(--muted); }
.steps3 strong { font-size: 22px; }
.steps3 .ours strong { color: var(--accent); }
.bytes { display: flex; height: 44px; border-radius: 6px; overflow: hidden; border: 1px solid var(--line); margin-top: 16px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 8px 0 0; padding: 0; list-style: none; font-size: 13px; color: var(--muted); }
.legend li { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; border: 1px solid var(--line); }
.header-b { background: var(--structure); }
.directory-b { background: var(--structure-soft); }
.pad-b { background: var(--pad); }
.column-b { background: var(--data); }
.column-pad-b { background: var(--data-soft); }
.meta-b { background: var(--accent); }
.hl-a { color: var(--data); }
.hl-b { color: var(--accent); }
.levels { display: grid; gap: 6px; margin-top: 16px; font-size: 13px; }
.level { display: flex; gap: 8px; align-items: center; }
.level > span { width: 110px; flex: none; color: var(--muted); font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.buckets { flex: 1; display: grid; gap: 2px; height: 22px; }
.buckets i { background: var(--data); border-radius: 2px; }
.l2 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.l1 { grid-template-columns: repeat(16, minmax(0, 1fr)); }
.l0 { grid-template-columns: repeat(64, minmax(0, 1fr)); gap: 1px; }
.l2 i { opacity: 0.85; } .l1 i { opacity: 0.65; } .l0 i { opacity: 0.45; border-radius: 1px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 10px; padding: 0; list-style: none; }
.chips li { padding: 2px 8px; border-radius: 999px; background: var(--data-soft); color: var(--data-ink); font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 13px; }
.address { border: 1px solid var(--line); border-radius: 8px; overflow: hidden; margin-top: 16px; }
.address .url { background: var(--code-bg); padding: 14px 16px; overflow-x: auto; white-space: nowrap; border-bottom: 1px solid var(--line); font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.address dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 0; padding: 14px 16px; font-size: 14px; }
.address dt { font-weight: 700; }
.address dd { margin: 0; color: var(--muted); }
.feed { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0 0; padding: 0; list-style: none; font-size: 14px; }
.feed li { flex: 1 1 140px; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }
.feed code { display: block; color: var(--muted); }
.feed .applied { border-color: var(--data); background: var(--data-soft); }
.feed .applied code { color: var(--data-ink); }
.feed .lost { border-style: dashed; color: var(--muted); }
.feed .gap { border-color: var(--accent); background: var(--warn-soft); }
.frame { display: flex; height: 36px; border-radius: 6px; overflow: hidden; margin: 0 0 10px; font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 12px; color: var(--bg); }
.frame span { display: flex; align-items: center; justify-content: center; min-width: 0; overflow: hidden; background: var(--structure); border-right: 2px solid var(--bg); }
.frame span:last-child { background: var(--data); border-right: 0; }
.protocol main section { padding-top: 56px; }
.works { padding-left: 24px; }
.works li { margin: 6px 0; }
.fields { display: grid; gap: 4px; margin: 0 0 10px; font-size: 15px; }
.fields div { display: flex; gap: 12px; }
.fields dt { width: 2.5em; flex: none; text-align: right; font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; color: var(--muted); }
.fields dd { margin: 0; min-width: 0; }

/* How it fits: the same core in three places, and what travels between
   server and page. Complete at rest; the motion only shows the flow. */
.fits { display: grid; gap: 16px; margin-top: 20px; }
.fits-row { display: flex; flex-wrap: wrap; gap: 16px; align-items: stretch; }
.fits h3 { margin: 0; font-size: 18px; }
.side { flex: 1 1 240px; min-width: 0; border: 1px solid var(--line); border-radius: 10px; padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.side ul { margin: 0; padding-left: 18px; font-size: 15px; }
.core { align-self: flex-start; padding: 3px 10px; border-radius: 999px; border: 1.5px solid var(--accent); color: var(--accent); font-size: 13px; font-weight: 600; }
.wire { flex: 1.4 1 300px; min-width: 0; display: flex; flex-direction: column; justify-content: center; gap: 18px; padding: 8px 4px; }
.lane { display: grid; gap: 6px; }
.lane p { margin: 0; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0 8px; font-size: 14px; }
.lane a, .lane strong { font-weight: 600; }
.lane span { color: var(--muted); }
.track { position: relative; height: 14px; border-radius: 7px; background: var(--panel); border: 1px solid var(--line); overflow: hidden; }
.mover { position: absolute; top: 2px; left: 0; animation: travel 3.2s linear infinite; }
.mover.tile { width: 10px; height: 8px; border-radius: 2px; background: var(--data); }
.mover.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--data); }
.mover.frame { width: 12px; height: 8px; border-radius: 1px; border: 2px solid var(--data); }
.mover.d1 { animation-delay: -0.8s; } .mover.d2 { animation-delay: -1.6s; } .mover.d3 { animation-delay: -2.4s; }
.mover.fast { animation-duration: 1.6s; }
.mover.fast.d1 { animation-delay: -0.4s; } .mover.fast.d2 { animation-delay: -0.8s; } .mover.fast.d3 { animation-delay: -1.2s; }
.mover.slow { animation-duration: 4.8s; }
@keyframes travel { from { left: 0%; } to { left: calc(100% - 12px); } }
@media (prefers-reduced-motion: reduce) {
  .mover { animation: none; }
  .mover.d1 { left: 25%; } .mover.d2 { left: 50%; } .mover.d3 { left: 75%; }
}
.native { border: 1px solid var(--line); border-radius: 10px; padding: 18px; background: var(--panel); display: flex; flex-wrap: wrap; gap: 16px 32px; }
.native > div { flex: 1 1 220px; display: flex; flex-direction: column; gap: 10px; }
.native dl { flex: 3 1 480px; min-width: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; font-size: 15px; }
.native dt { font-weight: 700; }
.native dd { margin: 0; color: var(--muted); }
.fits figcaption { text-align: left; margin: 0; }