/* Shared site typography, colour and layout. */
:root {
  color-scheme:light;
  --bg:#f5f4ef;
  --panel:#eeede7;
  --ink:#242522;
  --muted:#62635d;
  --line:#cdcec5;
  --accent:#b63827;
  --sans:Arial,Helvetica,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --mark:var(--accent);
  --mark-bg:#ecdcd3;
  --space:#575f86;
  --space-bg:#e1e3eb;
  --rule:var(--line);
  --ink-3:var(--muted);
}
@media(prefers-color-scheme:dark) {
  :root {
    color-scheme:dark;
    --bg:#20221f;
    --panel:#292c27;
    --ink:#f0f0e7;
    --muted:#b3b6aa;
    --line:#4e5348;
    --accent:#f18d74;
    --mark-bg:#44332c;
    --space:#b0b9e5;
    --space-bg:#343846;
  }
}
*,*::before,*::after {
  box-sizing:border-box;
}
html {
  scroll-padding-top:2rem;
}
body {
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:16px/1.6 var(--sans);
  -webkit-text-size-adjust:100%;
}
a {
  color:inherit;
  text-underline-offset:.25em;
  text-decoration-thickness:1px;
}
a:hover {
  color:var(--accent);
}
a:focus-visible,button:focus-visible {
  outline:2px solid var(--accent);
  outline-offset:5px;
}
button {
  font:12px var(--mono);
  color:var(--ink);
  background:transparent;
  border:1px solid var(--line);
  padding:11px 13px;
  cursor:pointer;
  min-height:44px;
}
button:hover {
  border-color:var(--accent);
}
[hidden] {
  display:none!important;
}
.wrap {
  width:min(1180px,100% - 80px);
  margin-inline:auto;
}
.skip {
  position:absolute;
  top:-100px;
  left:20px;
  padding:12px;
  background:var(--bg);
  z-index:100;
}
.skip:focus {
  top:10px;
}
.masthead {
  display:flex;
  align-items:center;
  gap:28px;
  padding-block:26px;
  border-bottom:1px solid var(--ink);
}
.brand {
  font:bold 27px/1 var(--sans);
  letter-spacing:-1.5px;
  text-decoration:none;
}
.brand span {
  font-weight:400;
}
.brand i {
  font-style:normal;
  color:var(--accent);
  margin-left:8px;
}
.masthead nav {
  margin-left:auto;
  display:flex;
  gap:26px;
}
.masthead nav a {
  font:12px var(--mono);
  text-decoration:none;
}
.hero {
  padding-top:46px;
}
.eyebrow,.index,.protocol,.spec-strip,.figure-heading,.code-head {
  font:11px/1.6 var(--mono);
}
.eyebrow {
  text-transform:uppercase;
  letter-spacing:.12em;
  color:var(--muted);
  margin:0 0 28px;
}
h1,h2,h3,p {
  margin-top:0;
}
h1 {
  font-size:clamp(44px,6.2vw,80px);
  line-height:1.06;
  letter-spacing:-.05em;
  font-weight:500;
  margin-bottom:34px;
}
.intro {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:36px;
}
.intro p {
  font-size:20px;
  line-height:1.5;
  max-width:610px;
  margin:0;
}
.action {
  font:12px var(--mono);
  padding-block:14px;
  border-bottom:1px solid var(--ink);
  white-space:nowrap;
  text-decoration:none;
}
.action span {
  margin-left:32px;
}
.spec-strip {
  display:flex;
  flex-wrap:wrap;
  gap:12px 32px;
  padding-block:23px;
  color:var(--muted);
}
.cycle {
  margin:20px 0 0;
  padding:20px 24px;
  background:var(--panel);
  border-top:2px solid var(--ink);
}
.figure-heading {
  display:flex;
  justify-content:space-between;
  gap:12px;
  color:var(--muted);
  margin-bottom:16px;
}
.spectrum-scroll {
  overflow-x:auto;
}
.cycle svg {
  display:block;
  width:100%;
  min-width:640px;
  height:auto;
}
.cycle figcaption {
  font-size:12px;
  max-width:650px;
  color:var(--muted);
  margin-top:12px;
}
.sp-band {
  fill:var(--mark-bg);
  stroke:var(--mark);
}
.sp-band.alt {
  fill:var(--space-bg);
  stroke:var(--space);
}
.sp-name {
  fill:var(--ink);
  font:12px var(--mono);
}
.sp-num {
  fill:var(--muted);
  font:11px var(--mono);
}
.sp-tick,.sp-axis,.sp-lead {
  stroke:var(--line);
}
.sp-brace {
  stroke:var(--muted);
}
.section {
  padding-block:72px;
  border-bottom:1px solid var(--ink);
}
.section-head {
  display:grid;
  grid-template-columns:180px 1fr 310px;
  gap:28px;
  align-items:start;
  margin-bottom:38px;
}
.section-head .eyebrow {
  padding-top:7px;
}
h2 {
  font-size:44px;
  line-height:1.08;
  font-weight:500;
  letter-spacing:-.045em;
  margin:0;
}
.section-head>p:last-child {
  color:var(--muted);
  font-size:14px;
  margin:4px 0 0;
}
.modem {
  display:grid;
  grid-template-columns:180px 1fr 150px;
  gap:28px;
  padding-block:28px;
  border-top:1px solid var(--line);
}
.modem h3 {
  font-size:30px;
  font-weight:500;
  letter-spacing:-1px;
  margin:4px 0 0;
}
.index {
  color:var(--accent);
}
.protocol {
  color:var(--muted);
}
.modem p {
  max-width:620px;
  font-size:15px;
  color:var(--muted);
  margin:8px 0 0;
}
.modem .status {
  font-size:20px;
  color:var(--ink);
  margin:0;
}
.modem>a {
  align-self:center;
  font:11px var(--mono);
}
.margin-note {
  font-size:12px;
  color:var(--muted);
  max-width:740px;
  margin:20px 0 0;
}
.guide-feature {
  position:relative;
  display:grid;
  grid-template-columns:1fr;
  gap:24px;
  padding:36px;
  background:var(--panel);
  text-decoration:none;
  border-top:2px solid var(--ink);
}
.guide-feature .eyebrow {
  display:block;
  margin-bottom:20px;
}
.guide-feature h3 {
  font-size:38px;
  font-weight:500;
  line-height:1;
  letter-spacing:-.05em;
  margin-bottom:24px;
}
.guide-feature p {
  color:var(--muted);
  font-size:14px;
  margin:0;
}
.guides {
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
}
.guides>a {
  position:relative;
  padding:26px 28px 26px 0;
  border-bottom:1px solid var(--line);
  text-decoration:none;
}
.guides>a:nth-child(even) {
  padding-left:28px;
  border-left:1px solid var(--line);
}
.guides .eyebrow {
  display:block;
  margin-bottom:22px;
}
.guides h3 {
  font-size:23px;
  font-weight:500;
  letter-spacing:-.04em;
  margin-bottom:8px;
}
.guides p {
  font-size:13px;
  color:var(--muted);
  margin:0;
}
.guides>a>span:last-child {
  position:absolute;
  right:15px;
  top:22px;
}
.workbench {
  display:grid;
  grid-template-columns:minmax(0,1fr) 270px;
  gap:48px;
}
.code-head {
  display:flex;
  align-items:center;
  gap:12px;
  border-bottom:1px solid var(--line);
  padding-bottom:10px;
  color:var(--muted);
}
.code-head button {
  margin-left:auto;
}
pre {
  margin:0;
  padding:24px 0;
  overflow-x:auto;
  font:12px/1.9 var(--mono);
}
code {
  font-family:var(--mono);
  font-size:.9em;
}
pre code {
  font:inherit;
}
aside {
  border-left:1px solid var(--line);
  padding-left:28px;
}
aside h3 {
  font-size:16px;
  font-weight:500;
}
aside a {
  display:block;
  font-size:13px;
  margin:12px 0;
}
aside p {
  font-size:12px;
  color:var(--muted);
  margin:24px 0 0;
}
footer {
  display:flex;
  justify-content:space-between;
  gap:30px;
  padding-block:36px 60px;
}
footer p {
  font-size:12px;
  color:var(--muted);
  margin:18px 0 0;
}
footer nav {
  display:flex;
  gap:22px;
  font:12px var(--mono);
}
.document {
  padding-block:48px 72px;
  overflow-wrap:anywhere;
}
.document h1 {
  font-size:clamp(36px,5vw,64px);
  margin-bottom:28px;
}
.document h2 {
  padding-top:32px;
  margin:44px 0 24px;
  border-top:1px solid var(--line);
  font-size:32px;
}
.document h3 {
  margin:28px 0 16px;
  font-size:21px;
  font-weight:500;
}
.document p,.document ul,.document ol {
  max-width:78ch;
}
.document p,.document li {
  line-height:1.7;
}
.document li+li {
  margin-top:8px;
}
.document .table-scroll {
  overflow-x:auto;
  margin:24px 0 32px;
}
.document table {
  width:100%;
  border-collapse:collapse;
  font-size:14px;
  line-height:1.6;
}
.document th,.document td {
  padding:14px 18px 14px 0;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid var(--line);
  min-width:140px;
}
.document th {
  color:var(--muted);
  font:12px/1.6 var(--mono);
  border-top:1px solid var(--ink);
}
.document td:first-child {
  min-width:170px;
}
.document pre {
  padding:20px;
  background:var(--panel);
}
.document blockquote {
  margin:24px 0;
  padding-left:20px;
  border-left:2px solid var(--line);
  color:var(--muted);
}
@media(max-width:1000px) {
  .section-head {
    grid-template-columns:140px 1fr;
  }
  .section-head>p:last-child {
    grid-column:2;
    max-width:440px;
  }
  .modem {
    grid-template-columns:140px 1fr;
  }
  .modem>a {
    grid-column:2;
  }
  .workbench {
    gap:28px;
  }
}
@media(max-width:700px) {
  .wrap {
    width:calc(100% - 36px);
  }
  .masthead {
    flex-wrap:wrap;
    gap:18px;
    padding-block:20px;
  }
  .masthead nav {
    order:3;
    width:100%;
    justify-content:space-between;
  }
  .hero {
    padding-top:32px;
  }
  .hero>.eyebrow {
    font-size:9px;
  }
  h1 {
    font-size:clamp(44px,10.4vw,72px);
  }
  .intro {
    display:block;
  }
  .intro p {
    font-size:17px;
  }
  .action {
    display:inline-block;
    margin-top:20px;
  }
  .cycle {
    padding:16px;
  }
  .figure-heading {
    flex-direction:column;
    font-size:10px;
  }
  .section {
    padding-block:44px;
  }
  .section-head {
    display:block;
    margin-bottom:28px;
  }
  .section-head .eyebrow {
    margin-bottom:18px;
  }
  h2 {
    font-size:36px;
  }
  .section-head>p:last-child {
    margin-top:20px;
  }
  .modem {
    grid-template-columns:100px minmax(0,1fr);
    gap:18px;
  }
  .modem h3 {
    font-size:26px;
  }
  .protocol {
    font-size:10px;
  }
  .modem .status {
    font-size:18px;
  }
  .modem p {
    font-size:14px;
  }
  .guide-feature {
    grid-template-columns:1fr;
    padding:24px;
  }
  .guide-feature h3 {
    font-size:32px;
  }
  .guides {
    grid-template-columns:1fr;
  }
  .guides>a,.guides>a:nth-child(even) {
    padding:24px 0;
    border-left:0;
  }
  .workbench {
    grid-template-columns:minmax(0,1fr);
  }
  aside {
    padding:24px 0 0;
    border-left:0;
    border-top:1px solid var(--line);
  }
  footer {
    flex-wrap:wrap;
  }
  footer nav {
    width:100%;
    flex-wrap:wrap;
  }
  .code-head {
    flex-wrap:wrap;
  }
  .code-head>span:first-child {
    font-size:10px;
  }
}
@media(prefers-reduced-motion:reduce) {
  *,*::before,*::after {
    animation:none!important;
    transition:none!important;
    scroll-behavior:auto!important;
  }
}
@media print {
  button,.skip {
    display:none;
  }
  :root {
    --bg:white;
    --ink:black;
    --muted:#444;
  }
  .wrap {
    width:100%;
  }
  .section {
    padding-block:25px;
  }
  a {
    color:inherit;
  }
  .cycle svg {
    min-width:0;
  }
  .modem,figure {
    break-inside:avoid;
  }
}