@import url('./tokens.css');
* {
  box-sizing:border-box
}
html {
  scroll-behavior:smooth;
  scroll-padding-top:120px
}
body {
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:500 18px/1.6 var(--body);
  -webkit-font-smoothing:antialiased
}
button,input,select {
  font:inherit
}
button,a {
  -webkit-tap-highlight-color:transparent
}
a {
  color:inherit;
  text-decoration:none
}
button {
  color:inherit
}
a:focus-visible,button:focus-visible,select:focus-visible,summary:focus-visible {
  outline:2px solid var(--network);
  outline-offset:6px
}
::selection {
  color:var(--bg);
  background:var(--ink)
}
img,svg {
  max-width:100%;
  height:auto
}
button {
  cursor:pointer
}
h1,h2,h3,h4,p {
  margin:0
}
h1,h2,h3,h4 {
  font-family:var(--display);
  font-weight:600;
  line-height:1.05
}
h1 {
  font-size:clamp(58px,6.6vw,96px);
  letter-spacing:-.025em
}
h2 {
  font-size:clamp(38px,4.2vw,60px);
  letter-spacing:-.02em
}
h3 {
  font-size:28px
}
p+p {
  margin-top:20px
}
ul,ol {
  padding-left:24px
}
.wrap {
  width:min(calc(100% - var(--page)*2),var(--max));
  margin-inline:auto
}
.muted {
  color:var(--muted)
}
.mono {
  font-family:var(--mono)
}
.eyebrow {
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  font-weight:600;
  line-height:1.6
}
.section-no {
  font-family:var(--mono);
  font-size:12px;
  color:var(--muted);
  display:inline-block;
  margin-right:16px
}
.skip {
  position:fixed;
  top:12px;
  left:16px;
  z-index:100;
  background:var(--ink);
  color:var(--bg);
  padding:12px 20px;
  transform:translateY(-180%)
}
.skip:focus {
  transform:none
}
.header {
  position:sticky;
  top:0;
  z-index:30;
  background:var(--bg);
  border-bottom:1px solid transparent;
  transition:border-color 300ms var(--ease),background 300ms var(--ease)
}
.header-inner {
  height:var(--header);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  transition:height 300ms var(--ease)
}
.header.scrolled {
  border-color:var(--line)
}
.header.scrolled .header-inner {
  height:76px
}
.brand {
  display:inline-flex;
  padding:14px;
  margin-left:-14px
}
.brand img {
  width:155px;
  height:34px
}
.nav {
  display:flex;
  align-items:center;
  gap:32px
}
.nav a {
  font-size:15px;
  padding:12px 0;
  position:relative
}
.nav a:after {
  content:'';
  position:absolute;
  left:0;
  bottom:4px;
  width:0;
  height:1px;
  background:var(--ink);
  transition:width var(--micro) var(--ease)
}
.nav a:hover:after,.nav a[aria-current=page]:after {
  width:100%
}
.nav .nav-library {
  border:1px solid var(--line);
  padding:10px 18px
}
.nav-library:after {
  display:none
}
.nav-library:hover {
  border-color:var(--ink)
}
.menu-toggle {
  display:none;
  background:none;
  border:1px solid var(--line);
  padding:10px 15px;
  min-height:44px
}
.hero {
  padding-top:58px
}
.hero-top {
  display:flex;
  justify-content:space-between;
  gap:24px;
  padding-top:20px
}
.hero-top .edition {
  font-family:var(--mono);
  font-size:11px;
  color:var(--muted)
}
.hero-grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:60px;
  align-items:center;
  padding:62px 0 76px
}
.hero h1 span {
  display:block
}
.hero h1 .quiet {
  color:var(--muted)
}
.hero-copy>p {
  font-size:20px;
  max-width:440px;
  margin-top:28px;
  color:var(--muted);
  line-height:1.5
}
.actions {
  display:flex;
  gap:24px;
  align-items:center;
  flex-wrap:wrap;
  margin-top:32px
}
.button {
  display:inline-flex;
  align-items:center;
  justify-content:space-between;
  gap:28px;
  font-size:16px;
  min-height:50px;
  padding:13px 20px;
  border:1px solid var(--ink);
  transition:background var(--micro) var(--ease),color var(--micro) var(--ease),transform var(--micro) var(--ease)
}
.button.primary {
  background:var(--ink);
  color:var(--bg)
}
.button:hover {
  background:var(--ink);
  color:var(--bg);
  transform:translateY(-2px)
}
.button.primary:hover {
  background:transparent;
  color:var(--ink)
}
.text-link {
  font-size:16px;
  display:inline-flex;
  align-items:center;
  gap:16px;
  min-height:44px;
  border-bottom:1px solid var(--line);
  transition:border-color var(--micro) var(--ease)
}
.text-link:hover {
  border-color:var(--ink)
}
.arrow {
  font-family:var(--body);
  transition:transform var(--micro) var(--ease)
}
.text-link:hover .arrow,.button:hover .arrow {
  transform:translateX(4px)
}
.diagram {
  position:relative;
  padding:28px 0 0;
  min-width:0
}
.diagram-head {
  display:flex;
  justify-content:space-between;
  align-items:center;
  border-top:1px solid var(--line);
  padding-top:18px;
  font:500 11px var(--mono);
  color:var(--muted)
}
.diagram-head button {
  border:0;
  background:none;
  color:var(--muted);
  font:inherit;
  min-height:44px;
  padding:8px;
  display:none
}
.js .diagram-head button {
  display:block
}
.diagram-head button:hover {
  color:var(--ink)
}
.ip-address {
  font:500 clamp(25px,2.4vw,36px) var(--mono);
  padding:38px 0 26px;
  white-space:nowrap
}
.ip-address .prefix {
  color:var(--network);
  border-bottom:2px solid var(--network);
  padding-bottom:8px
}
.bits {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px;
  margin-top:28px
}
.octet {
  min-width:0
}
.octet-bits {
  display:grid;
  grid-template-columns:repeat(8,1fr);
  gap:3px
}
.bit {
  font:500 clamp(13px,1.35vw,19px)/2.6 var(--mono);
  text-align:center;
  border-bottom:2px solid var(--network);
  color:var(--network);
  position:relative
}
.bit.host {
  border-color:var(--host);
  color:var(--host)
}
.octet-value {
  font:500 12px var(--mono);
  text-align:center;
  margin-top:12px;
  color:var(--muted)
}
.bit-ruler {
  display:flex;
  justify-content:space-between;
  margin-top:10px;
  color:var(--muted);
  font:500 10px var(--mono)
}
.role-dimensions {
  display:grid;
  grid-template-columns:26fr 6fr;
  gap:10px;
  margin-top:28px
}
.dimension {
  border-top:1px solid var(--network);
  position:relative;
  padding-top:14px;
  color:var(--network);
  font-size:12px
}
.dimension:before,.dimension:after {
  content:'';
  position:absolute;
  top:-5px;
  width:1px;
  height:9px;
  background:currentColor
}
.dimension:before {
  left:0
}
.dimension:after {
  right:0
}
.dimension.host {
  color:var(--host);
  border-color:var(--host)
}
.dimension strong {
  font:600 30px var(--display);
  display:block
}
.diagram-result {
  margin-top:32px;
  padding-top:22px;
  border-top:1px solid var(--line);
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:16px
}
.diagram-result .eyebrow {
  color:var(--muted);
  font-size:10px
}
.diagram-result strong {
  display:block;
  font:500 clamp(22px,2vw,30px) var(--mono);
  margin-top:8px
}
.diagram-result .resolve {
  font:500 11px var(--mono);
  color:var(--network)
}
.diagram-caption {
  font-size:12px;
  color:var(--muted);
  margin-top:20px
}
.host-transform {
  margin-top:24px;
  border-top:1px solid var(--line);
  padding-top:18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px 24px;
  font-size:13px;
  color:var(--muted);
}
.transform-equation {
  display:flex;
  align-items:center;
  gap:16px;
  font:500 16px var(--mono);
  color:var(--ink);
}
.host-digits,.transform-host { color:var(--host); }
.transform-host { position:relative; display:inline-block; }
.transform-input { position:absolute; inset:0; opacity:0; }
.transform-arrow { color:var(--muted); }
.diagram.hero-motion-ready:not(.animate) .bit,
.diagram.hero-motion-ready:not(.animate) .dimension,
.diagram.hero-motion-ready:not(.animate) .host-transform,
.diagram.hero-motion-ready:not(.animate) .diagram-result { opacity:0; }
.diagram.animate .bit:not(.host) {
  animation:bit-reveal .6s var(--ease) both, network-highlight .5s var(--ease) both;
  animation-delay:calc(var(--i)*.012s),.9s;
}
.diagram.animate .bit.host {
  animation:bit-reveal .6s var(--ease) both, host-highlight .5s var(--ease) both;
  animation-delay:calc(var(--i)*.012s),1.6s;
}
.diagram.animate .dimension:not(.host) { animation:diagram-reveal .5s .9s var(--ease) both; }
.diagram.animate .dimension.host { animation:diagram-reveal .5s 1.6s var(--ease) both; }
.diagram.animate .host-transform { animation:diagram-reveal .4s 2.2s var(--ease) both; }
.diagram.animate .transform-input { animation:transform-input .6s 2.65s var(--ease) both; }
.diagram.animate .transform-output { animation:transform-output .6s 2.65s var(--ease) both; }
.diagram.animate .diagram-result { animation:diagram-reveal .6s 3.5s var(--ease) both; }
@keyframes bit-reveal {
  from { opacity:0; transform:translateY(-8px); }
  to { opacity:1; transform:none; }
}
@keyframes diagram-reveal {
  from { opacity:0; transform:translateY(6px); }
  to { opacity:1; transform:none; }
}
@keyframes network-highlight {
  from { color:var(--ink); border-color:var(--line); }
  to { color:var(--network); border-color:var(--network); }
}
@keyframes host-highlight {
  from { color:var(--ink); border-color:var(--line); }
  to { color:var(--host); border-color:var(--host); }
}
@keyframes transform-input {
  from { opacity:1; transform:none; }
  to { opacity:0; transform:translateY(-5px); }
}
@keyframes transform-output {
  from { opacity:0; transform:translateY(5px); }
  to { opacity:1; transform:none; }
}
.section {
  padding:96px 0;
}
.section-head {
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:32px;
  margin-bottom:40px
}
.section-head .eyebrow {
  margin-bottom:16px;
  color:var(--muted)
}
.section-head p {
  max-width:350px;
  color:var(--muted);
  font-size:17px
}
.intro-grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:80px
}
.intro-grid>div>p {
  color:var(--muted);
  font-size:20px;
  max-width:520px
}
.intro-grid .text-link {
  margin-top:26px
}
.topics {
  display:grid;
  grid-template-columns:1fr 1fr;
  column-gap:48px
}
.topic {
  min-height:130px;
  padding:26px 4px;
  display:grid;
  grid-template-columns:30px 1fr 30px;
  gap:22px;
  align-items:start
}
.topic .topic-id {
  font:500 12px var(--mono);
  color:var(--muted);
  padding-top:5px
}
.topic h3 {
  font-size:27px
}
.topic p {
  font-size:15px;
  color:var(--muted);
  margin-top:10px
}
.topic .arrow {
  font-size:24px;
  line-height:1.2
}
.topic:hover .arrow {
  transform:translate(4px,-4px)
}
.topic:hover h3 {
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:5px
}
.video-grid {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:28px
}
.video-card {
  min-width:0
}
.video-card a {
  display:block
}
.thumbnail {
  aspect-ratio:16/10;
  background:var(--surface);
  border:1px solid var(--line);
  position:relative;
  overflow:hidden;
  padding:26px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  transition:border-color var(--micro) var(--ease)
}
.thumbnail .eyebrow {
  font-size:9px;
  color:var(--muted);
  letter-spacing:.12em
}
.thumbnail .thumb-title {
  font:600 clamp(22px,2.4vw,35px)/1.15 var(--display)
}
.thumbnail .thumb-bottom {
  display:flex;
  justify-content:space-between;
  font:500 11px var(--mono);
  color:var(--muted)
}
.thumbnail .mini-bits {
  font:500 clamp(13px,1.3vw,18px) var(--mono);
  color:var(--network);
  border-bottom:2px solid var(--network);
  align-self:flex-start;
  letter-spacing:.18em
}
.thumbnail .mini-bits .host {
  color:var(--host)
}
.video-card:hover .thumbnail {
  border-color:var(--ink)
}
.video-card h3 {
  font-size:27px;
  margin-top:16px
}
.video-card p {
  font-size:16px;
  color:var(--muted);
  margin-top:12px
}
.card-meta {
  display:flex;
  justify-content:space-between;
  gap:12px;
  align-items:center;
  margin-top:20px;
  font-size:12px;
  color:var(--muted)
}
.badge {
  border:1px solid var(--line);
  padding:3px 8px;
  font-size:11px;
  letter-spacing:.05em;
  text-transform:uppercase;
  color:var(--muted)
}
.video-note {
  margin-top:28px;
  color:var(--muted);
  font-size:13px
}
.method-grid {
  display:grid;
  grid-template-columns:1.1fr 1fr;
  gap:80px
}
.method-intro p {
  color:var(--muted);
  max-width:430px;
  margin-top:24px;
  font-size:20px
}
.method-steps {
  counter-reset:steps
}
.method-step {
  padding:24px 0;
  display:grid;
  grid-template-columns:38px 1fr;
  gap:20px
}
.method-step:before {
  counter-increment:steps;
  content:'0' counter(steps);
  font:500 12px var(--mono);
  color:var(--muted);
  padding-top:7px
}
.method-step h3 {
  font-size:28px
}
.method-step p {
  font-size:16px;
  color:var(--muted);
  margin-top:12px
}
.library-feature {
  display:grid;
  grid-template-columns:.8fr 1.2fr;
  gap:70px;
  align-items:center
}
.library-copy p {
  color:var(--muted);
  margin-top:24px
}
.library-copy .text-link {
  margin-top:26px
}
.article-preview {
  padding:28px 0;
  display:block
}
.article-preview .eyebrow {
  color:var(--muted)
}
.article-preview h3 {
  font-size:40px;
  margin:24px 0 18px
}
.article-preview p {
  color:var(--muted);
  max-width:520px
}
.preview-bottom {
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-top:28px;
  font:500 12px var(--mono);
  color:var(--muted)
}
.closing {
  padding:70px 0;
  display:flex;
  justify-content:space-between;
  gap:40px;
  align-items:center;
}
.closing h2 {
  font-size:clamp(40px,4.3vw,62px)
}
.closing p {
  margin-top:12px;
  color:var(--muted)
}
.footer {
  border-top:1px solid var(--line);
  padding:48px 0 28px
}
.footer-top {
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:32px
}
.footer-brand img {
  width:164px;
  height:36px;
  margin:14px 0
}
.footer-top p {
  font-size:14px;
  color:var(--muted)
}
.footer-links {
  display:flex;
  gap:28px;
  font-size:14px
}
.footer-links a {
  padding:12px 0
}
.footer-links a:hover {
  text-decoration:underline
}
.footer-bottom {
  display:flex;
  justify-content:space-between;
  gap:24px;
  padding-top:24px;
  margin-top:34px;
  font-size:12px;
  color:var(--muted)
}
.page-head {
  padding:52px 0 62px
}
.breadcrumb {
  font-size:13px;
  color:var(--muted);
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:36px
}
.breadcrumb a {
  min-height:24px
}
.breadcrumb a:hover {
  text-decoration:underline
}
.page-head h1 {
  max-width:900px;
  font-size:clamp(52px,6vw,84px)
}
.page-head>.eyebrow {
  margin-bottom:18px;
  color:var(--muted)
}
.page-head>.lead {
  color:var(--muted);
  font-size:22px;
  max-width:700px;
  margin-top:24px
}
.preview-notice {
  border-left:2px solid var(--ink);
  background:var(--surface);
  padding:16px 22px;
  font-size:15px;
  margin-top:32px;
  max-width:900px
}
.preview-notice strong {
  font-weight:600
}
.listing {
  padding:0 0 96px
}
.filter-bar {
  padding:24px 0 38px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:24px
}
.filter-control {
  display:none;
  align-items:center;
  gap:18px;
  font-size:15px
}
.js .filter-control {
  display:flex
}
select {
  background:var(--surface);
  color:var(--ink);
  border:1px solid var(--line);
  border-radius:0;
  padding:10px 35px 10px 14px;
  max-width:100%;
  min-height:44px
}
.filter-status {
  font:500 12px var(--mono);
  color:var(--muted)
}
[hidden] {
  display:none!important
}
.empty-state {
  padding:48px 0;
  border-top:1px solid var(--line);
  color:var(--muted)
}
.article-list {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px
}
.article-layout {
  display:grid;
  grid-template-columns:230px minmax(0,740px);
  gap:80px;
  padding-bottom:96px;
  align-items:start
}
.toc {
  position:sticky;
  top:112px;
  padding-top:20px;
  font-size:14px
}
.toc .eyebrow {
  color:var(--muted);
  margin-bottom:16px
}
.toc ol {
  list-style:none;
  padding:0;
  margin:0
}
.toc li {
  margin-bottom:6px
}
.toc a {
  display:block;
  padding:8px 0;
  color:var(--muted)
}
.toc a:hover {
  color:var(--ink)
}
.article-body {
  min-width:0
}
.article-body section {
  margin-bottom:60px;
  scroll-margin-top:116px
}
.article-body h2 {
  font-size:38px;
  margin-bottom:24px
}
.article-body h3 {
  font-size:26px;
  margin:32px 0 16px
}
.article-body p,.article-body li {
  color:var(--muted)
}
.article-body strong {
  color:var(--ink);
  font-weight:600
}
.article-body a {
  color:var(--ink);
  text-decoration:underline;
  text-underline-offset:4px
}
.definition {
  border-top:2px solid var(--ink);
  padding:24px 0;
  border-bottom:1px solid var(--line)
}
.definition .eyebrow {
  color:var(--muted);
  margin-bottom:12px
}
.definition p {
  color:var(--ink);
  font-size:22px
}
.article-meta {
  display:flex;
  flex-wrap:wrap;
  gap:12px 30px;
  margin-top:24px;
  font-size:13px;
  color:var(--muted)
}
.code-block {
  margin:26px 0;
  border:1px solid var(--line);
  background:var(--surface)
}
.code-head {
  padding:12px 18px;
  border-bottom:1px solid var(--line);
  font:500 11px var(--mono);
  color:var(--muted)
}
pre {
  font:500 14px/1.9 var(--mono);
  padding:20px;
  margin:0;
  overflow-x:auto;
  tab-size:2
}
code {
  font-family:var(--mono);
  font-size:.85em
}
pre code {
  font-size:inherit
}
.article-diagram {
  border:1px solid var(--line);
  padding:26px;
  margin:28px 0
}
.article-diagram figcaption {
  color:var(--muted);
  font-size:13px;
  margin-top:20px
}
.net-strip {
  display:flex;
  gap:6px;
  font:500 clamp(12px,1.8vw,21px) var(--mono);
  flex-wrap:wrap
}
.net-strip span {
  border-bottom:2px solid var(--network);
  color:var(--network);
  padding:10px 0
}
.net-strip .host {
  border-color:var(--host);
  color:var(--host)
}
.diagram-legend {
  display:flex;
  gap:26px;
  flex-wrap:wrap;
  font-size:13px;
  margin-top:18px
}
.diagram-legend .network {
  color:var(--network)
}
.diagram-legend .host {
  color:var(--host)
}
.facts {
  width:100%;
  border-collapse:collapse;
  margin:24px 0;
  font-size:16px
}
.facts td,.facts th {
  text-align:left;
  padding:12px 0;
  border-bottom:1px solid var(--line)
}
.facts th {
  color:var(--muted);
  font-weight:500
}
.facts td {
  font-family:var(--mono);
  font-size:13px
}
details {
  border-top:1px solid var(--line);
  padding:18px 0
}
summary {
  cursor:pointer;
  font-weight:600;
  min-height:44px;
  align-content:center
}
details p {
  margin:14px 0
}
.glossary {
  margin:0
}
.glossary dt {
  font-family:var(--display);
  font-size:23px;
  margin-top:22px
}
.glossary dd {
  margin:6px 0 0;
  color:var(--muted)
}
.player-placeholder {
  aspect-ratio:16/9;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  padding:28px;
  border:1px solid var(--line);
  background:var(--surface);
  flex-direction:column;
  gap:18px
}
.player-placeholder h2 {
  font-size:32px;
  margin:0
}
.player-placeholder p {
  max-width:480px;
  font-size:15px
}
.player-placeholder iframe {
  width:100%;
  height:100%;
  border:0
}
.player-placeholder.loaded {
  padding:0
}
.consent-footer {
  padding:0;
  border:0;
  background:none;
  font:inherit;
  text-align:left;
  min-height:44px;
  text-decoration:underline;
  text-underline-offset:4px
}
.cookie-launcher {
  position:fixed;
  left:max(16px,env(safe-area-inset-left));
  bottom:max(16px,env(safe-area-inset-bottom));
  z-index:101;
  width:52px;
  height:52px;
  display:grid;
  place-items:center;
  padding:10px;
  color:var(--ink);
  background:var(--surface);
  border:1px solid var(--muted);
  transition:color var(--micro) var(--ease),border-color var(--micro) var(--ease)
}
.cookie-launcher .cookie-chips {
  color:var(--network)
}
.cookie-launcher:hover,.cookie-launcher:focus-visible {
  color:var(--network);
  border-color:var(--network)
}
.consent-banner {
  position:fixed;
  inset:auto 0 0;
  z-index:100;
  border-top:1px solid var(--muted);
  background:var(--surface);
  max-height:55dvh;
  overflow:auto;
  overscroll-behavior:contain
}
.consent-inner {
  max-width:1280px;
  margin:auto;
  padding:24px;
  display:grid;
  grid-template-columns:1fr auto;
  gap:24px;
  align-items:center
}
.consent-banner h2,.consent-dialog h2 {
  font-size:28px;
  margin:0 0 12px
}
.consent-banner p,.consent-dialog p {
  font-size:16px;
  line-height:1.5;
  margin:8px 0;
  color:var(--ink)
}
.consent-banner a,.consent-dialog a {
  text-decoration:underline;
  text-underline-offset:3px
}
.consent-actions {
  display:flex;
  flex-wrap:wrap;
  gap:12px
}
.consent-banner .consent-actions {
  flex-direction:column
}
.consent-actions .button {
  justify-content:center;
  font-size:16px;
  min-height:48px
}
.consent-banner .button,.consent-dialog .button {
  font-family:var(--body);
  background:transparent;
  color:var(--ink)
}
.consent-banner .button:hover,.consent-dialog .button:hover {
  background:var(--ink);
  color:var(--bg)
}
.consent-dialog {
  width:calc(100% - 48px);
  max-width:720px;
  max-height:calc(100dvh - 48px);
  margin:auto;
  padding:28px;
  overflow:auto;
  color:var(--ink);
  background:var(--bg);
  border:1px solid var(--muted);
  overscroll-behavior:contain
}
.consent-dialog::backdrop {
  background:rgb(0 0 0 / .7)
}
.consent-dialog[open] {
  display:flex;
  flex-direction:column;
  overflow:hidden
}
.consent-dialog-content {
  min-height:0;
  overflow:auto;
  overscroll-behavior:contain;
  padding:8px;
  margin:0 -8px
}
.consent-dialog-head,.consent-dialog > .consent-actions {
  flex-shrink:0
}
.consent-dialog > .consent-actions {
  padding-top:16px;
  border-top:1px solid var(--line)
}
.consent-dialog-head {
  display:flex;
  align-items:start;
  justify-content:space-between;
  gap:20px
}
.consent-dialog-head .button {
  padding:10px 16px;
  min-height:44px
}
.consent-category {
  border-top:1px solid var(--line);
  margin:20px 0;
  padding-top:20px
}
.consent-category h3 {
  margin:0;
  font-size:23px
}
.consent-option {
  display:flex;
  align-items:center;
  gap:12px;
  min-height:44px;
  cursor:pointer;
  font-size:20px;
  font-weight:600
}
.consent-option input {
  width:24px;
  height:24px;
  accent-color:var(--network);
  flex-shrink:0
}
.consent-option input:focus-visible {
  outline:2px solid var(--network);
  outline-offset:4px
}
.consent-dialog .consent-status {
  color:var(--muted);
  margin-bottom:20px
}
@media(max-width:767px) {
  .consent-banner {max-height:80dvh}
  .consent-inner {grid-template-columns:1fr;gap:12px;padding:20px 24px max(20px,env(safe-area-inset-bottom))}
  .consent-banner .consent-actions {flex-direction:row}
  .consent-actions .button {flex:1 1 180px}
  .consent-dialog {padding:20px;width:calc(100% - 32px);max-height:calc(100dvh - 32px)}
  .consent-dialog-head {flex-wrap:wrap;gap:8px}
}
.simple-content {
  max-width:820px;
  padding-bottom:96px
}
.simple-content h2 {
  font-size:38px;
  margin:48px 0 20px
}
.simple-content p {
  color:var(--muted)
}
.simple-content ul {
  color:var(--muted)
}
.review-fields {
  border-top:1px solid var(--line);
  margin-top:32px
}
.review-fields li {
  border-bottom:1px solid var(--line);
  padding:16px 0;
  list-style:none
}
.review-fields ul {
  padding:0;
  margin:0
}
.statement {
  font-size:clamp(30px,4vw,56px);
  font-family:var(--display);
  line-height:1.2;
  max-width:850px;
  padding:40px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  margin:32px 0
}
.tag-row {
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:24px
}
.tag {
  border:1px solid var(--line);
  font-size:12px;
  padding:4px 10px
}
.topic-path {
  margin-top:36px;
  padding-top:28px
}
.topic-path ol {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:32px;
  padding-left:22px;
  color:var(--muted)
}
@media(min-width:1600px) {
  .hero-grid {
    gap:100px
  }
}
@media(max-width:1000px) {
  .nav {
    gap:20px
  }
  .hero-grid {
    gap:32px
  }
  .hero h1 {
    font-size:72px
  }
  .hero-copy>p {
    font-size:18px
  }
  .ip-address {
    font-size:25px
  }
  .bits {
    gap:8px
  }
  .bit {
    font-size:13px
  }
  .hero-grid {
    padding-top:50px
  }
  .intro-grid,.method-grid {
    gap:40px
  }
  .video-grid {
    gap:18px
  }
  .thumbnail {
    padding:18px
  }
  .thumbnail .thumb-title {
    font-size:28px
  }
  .article-layout {
    grid-template-columns:180px minmax(0,1fr);
    gap:36px
  }
  .library-feature {
    gap:40px
  }
  .topics {
    column-gap:28px
  }
  .topic {
    gap:14px
  }
  .topic h3 {
    font-size:25px
  }
  .article-preview h3 {
    font-size:34px
  }
}
@media(max-width:800px) {
  :root {
    --header:88px
  }
  .hero-grid {
    grid-template-columns:1fr;
    padding-bottom:48px;
    gap:50px
  }
  .hero h1 {
    font-size:clamp(60px,10vw,82px);
    max-width:620px
  }
  .hero-copy>p {
    max-width:500px
  }
  .diagram {
    max-width:640px;
    width:100%
  }
  .ip-address {
    font-size:36px
  }
  .bit {
    font-size:20px
  }
  .diagram-result strong {
    font-size:30px
  }
  .intro-grid {
    grid-template-columns:1fr;
    gap:28px
  }
  .section {
    padding:72px 0
  }
  .video-grid {
    grid-template-columns:1fr 1fr
  }
  .video-card:last-child {
    grid-column:1/-1;
    max-width:calc(50% - 9px)
  }
  .method-grid {
    grid-template-columns:1fr;
    gap:36px
  }
  .library-feature {
    grid-template-columns:1fr;
    gap:40px
  }
  .library-copy {
    max-width:560px
  }
  .footer-top {
    align-items:flex-start
  }
  .footer-links {
    flex-wrap:wrap;
    gap:8px 24px;
    max-width:260px
  }
  .section-head {
    align-items:flex-start
  }
  .section-head p {
    max-width:260px
  }
  .article-layout {
    grid-template-columns:1fr;
    gap:36px
  }
  .toc {
    position:static
  }
  .toc ol {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:0 24px
  }
  .article-body {
    max-width:740px
  }
  .page-head {
    padding-top:36px
  }
  .topic-path ol {
    grid-template-columns:1fr
  }
  .nav {
    gap:17px
  }
  .nav .nav-library {
    padding:9px 12px
  }
}
@media(max-width:640px) {
  :root {
    --page:24px;
    --header:88px
  }
  .header-inner {
    flex-wrap:wrap;
    gap:0;
    height:auto;
    min-height:var(--header)
  }
  .header.scrolled .header-inner {
    height:auto;
    min-height:72px
  }
  .brand img {
    width:137px;
    height:30px
  }
  .js .menu-toggle {
    display:block
  }
  .nav {
    width:100%;
    display:flex;
    flex-wrap:wrap;
    gap:0 24px;
    padding-bottom:20px;
    align-items:center
  }
  .nav a {
    padding:12px 0;
    font-size:15px
  }
  .nav .nav-library {
    padding:8px 12px
  }
  .js .nav {
    position:absolute;
    top:100%;
    left:0;
    right:0;
    width:auto;
    padding:12px var(--page) 20px;
    background:var(--bg);
    border-bottom:1px solid var(--line);
    display:flex;
    visibility:hidden;
    opacity:0;
    transform:translateY(-6px);
    pointer-events:none;
    transition:none;
  }
  .js .nav.menu-animated {
    transition:opacity var(--micro) var(--ease),transform var(--micro) var(--ease),visibility 0s var(--micro);
  }
  .js .nav.open {
    visibility:visible;
    opacity:1;
    transform:none;
    pointer-events:auto;
    transition-delay:0s;
  }
  .js .menu-toggle { width:124px; }

  .hero {
    padding-top:30px
  }
  .hero-top .edition {
    display:none
  }
  .hero-top {
    padding-top:16px
  }
  .hero-grid {
    padding-top:38px;
    gap:44px
  }
  .hero h1 {
    font-size:62px
  }
  .hero-copy>p {
    font-size:19px;
    margin-top:24px
  }
  .actions {
    gap:20px;
    margin-top:28px
  }
  .button {
    font-size:15px;
    gap:24px;
    padding:12px 16px
  }
  .diagram {
    padding-top:0
  }
  .ip-address {
    font-size:26px;
    padding-top:28px;
    padding-bottom:20px
  }
  .bits {
    grid-template-columns:1fr 1fr;
    gap:20px 22px;
    margin-top:20px
  }
  .bit {
    font-size:20px
  }
  .octet-value {
    font-size:11px
  }
  .bit-ruler {
    display:none
  }
  .role-dimensions {
    grid-template-columns:1fr 1fr;
    gap:22px
  }
  .dimension strong {
    font-size:28px
  }
  .diagram-result {
    margin-top:24px
  }
  .diagram-result strong {
    font-size:23px
  }
  .diagram-result .resolve {
    font-size:9px
  }
  .diagram-caption {
    font-size:11px
  }
  .section {
    padding:60px 0
  }
  .section-head {
    flex-direction:column;
    gap:22px;
    margin-bottom:32px
  }
  .section-head p {
    max-width:none
  }
  .section-head h2,h2 {
    font-size:40px
  }
  .intro-grid>div>p {
    font-size:18px
  }
  .topics {
    grid-template-columns:1fr
  }
  .topic {
    min-height:112px;
    padding:24px 0;
    gap:12px;
    grid-template-columns:26px 1fr 24px
  }
  .topic h3 {
    font-size:26px
  }
  .video-grid {
    grid-template-columns:1fr;
    gap:40px
  }
  .video-card:last-child {
    grid-column:auto;
    max-width:none
  }
  .thumbnail {
    padding:24px
  }
  .thumbnail .thumb-title {
    font-size:35px
  }
  .thumbnail .mini-bits {
    font-size:17px
  }
  .video-card h3 {
    font-size:29px
  }
  .method-intro p {
    font-size:18px
  }
  .article-preview h3 {
    font-size:34px
  }
  .closing {
    flex-direction:column;
    align-items:flex-start;
    padding:54px 0;
    gap:24px
  }
  .closing h2 {
    font-size:42px
  }
  .footer {
    padding-top:32px
  }
  .footer-top {
    flex-direction:column;
    gap:20px
  }
  .footer-links {
    max-width:none;
    gap:8px 22px
  }
  .footer-bottom {
    flex-direction:column;
    gap:10px;
    margin-top:24px
  }
  .page-head h1 {
    font-size:54px
  }
  .page-head>.lead {
    font-size:20px
  }
  .page-head {
    padding-bottom:42px
  }
  .breadcrumb {
    margin-bottom:26px;
    font-size:12px
  }
  .preview-notice {
    font-size:14px;
    padding:14px 18px
  }
  .filter-bar {
    flex-direction:column;
    align-items:stretch;
    gap:20px
  }
  .filter-control {
    flex-direction:column;
    align-items:stretch;
    gap:8px
  }
  .article-list {
    grid-template-columns:1fr;
    gap:32px
  }
  .listing {
    padding-bottom:60px
  }
  .toc ol {
    grid-template-columns:1fr
  }
  .article-body h2 {
    font-size:34px
  }
  .article-diagram {
    padding:18px;
    margin-inline:0
  }
  .article-body section {
    margin-bottom:44px
  }
  .facts td {
    font-size:11px
  }
  .article-meta {
    gap:8px 22px
  }
  .player-placeholder h2 {
    font-size:25px
  }
  .player-placeholder {
    aspect-ratio:auto;
    min-height:210px;
    padding:20px
  }
  .player-placeholder.loaded {
    aspect-ratio:16/9;
    min-height:0
  }
  .statement {
    font-size:36px
  }
  .simple-content {
    padding-bottom:60px
  }
}
@media(prefers-reduced-motion:reduce) {
  html {
    scroll-behavior:auto
  }
  *,*:before,*:after {
    animation:none!important;
    transition:none!important
  }
  .packet {
    display:none!important
  }
}
.diagram {
  margin:0
}
.thumbnail img {
  width:100%;
  height:54px;
  object-fit:contain
}
h1 {
  hyphens:auto;
  overflow-wrap:break-word
}
.toc a {
  min-height:44px
}
.nav a {
  min-height:44px;
  display:inline-flex;
  align-items:center
}
.menu-toggle,select,.nav .nav-library {
  border-color:var(--muted)
}
@media(max-width:640px) {
  html:not(.js) .header {
    position:static
  }
}
@media(max-width:640px) {
  .net-strip {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:12px 18px;
    font-size:18px
  }
  .net-strip>span {
    width:max-content;
    max-width:100%
  }
}

/* Foundation v1.1: readable metadata; narrative hierarchy stays unchanged. */
.hero-top .edition,.section-no,.topic .topic-id,.badge,.thumbnail .eyebrow,.thumbnail .thumb-bottom,.bit-ruler { font-size:12px; }
.diagram-head,.diagram-result .eyebrow,.diagram-result .resolve { font-size:12px; }
.diagram-caption,.octet-value,.dimension,.card-meta,.footer-bottom,.filter-status { font-size:13px; }
.thumbnail { gap:12px; }
.thumbnail .eyebrow { letter-spacing:.08em; }
.topic .arrow { transition:transform var(--micro) var(--ease); }
.topic:is(:hover,:focus-visible) .arrow { transform:translate(4px,-4px); }
.topic:focus-visible h3 { text-decoration:underline; text-decoration-thickness:1px; text-underline-offset:5px; }
.nav a:focus-visible:after { width:100%; }
.text-link:focus-visible .arrow,.button:focus-visible .arrow { transform:translateX(4px); }
@media(max-width:640px) {
  .diagram-head { gap:8px; flex-wrap:wrap; }
  .diagram-result { align-items:flex-start; flex-direction:column; gap:12px; }
  .transform-equation { font-size:15px; }
  .hero-copy .actions { gap:14px 24px; }
}
@media(prefers-reduced-motion:reduce) {
  .js .nav { transform:none; }
}

/* Keep footer controls clear of the persistent cookie launcher and banner. */
body {padding-bottom:max(80px,calc(var(--consent-height,0px) + var(--build-notice-height,0px) + 32px))}
html {scroll-padding-bottom:calc(var(--consent-height,0px) + 16px)}
h2,h3 {hyphens:auto;overflow-wrap:anywhere}
@media(max-width:640px) {
  .simple-content h2 {font-size:clamp(28px,7vw,38px)}
  .consent-banner h2 {font-size:24px}
  .consent-banner p {font-size:15px}
  .consent-inner {padding-top:16px;gap:8px}
  .consent-actions .button {flex:1 1 120px;padding-inline:12px}
}
@media(max-width:360px) {
  .ip-address {font-size:clamp(22px,7vw,25px)}
}

.build-notice {
  position:fixed;
  z-index:120;
  top:50%;
  left:50%;
  width:min(34rem,calc(100vw - 32px));
  padding:8px;
  transform:translate(-50%,-50%);
  background:repeating-linear-gradient(135deg,#f2b84b 0 10px,#15171b 10px 20px);
}
.build-notice[hidden] {display:none}
.build-notice-inner {
  position:relative;
  min-height:132px;
  padding:36px 48px;
  display:grid;
  place-items:center;
  background:var(--surface);
  text-align:center;
}
.build-notice-inner p {
  margin:0;
  color:var(--ink);
  font-size:clamp(22px,4vw,30px);
  line-height:1.25;
}
.build-notice-close {
  position:absolute;
  top:4px;
  right:8px;
  width:36px;
  height:36px;
  padding:0;
  border:0;
  color:var(--ink);
  background:transparent;
  font:400 30px/1 var(--body);
  cursor:pointer;
}
.build-notice-close:hover,.build-notice-close:focus-visible {color:#f2b84b}
.build-notice-close:focus-visible {outline:2px solid #f2b84b;outline-offset:2px}
@media(max-width:480px) {
  .build-notice-inner {min-height:116px;padding:34px 30px}
}

/* Separate the construction notice from consent, leaving room for keyboard focus. */
.has-consent-banner .build-notice {
  top:auto;
  bottom:calc(var(--consent-height,0px) + 16px);
  transform:translateX(-50%);
}
.has-consent-banner.has-build-notice .consent-banner {
  max-height:max(96px,min(55dvh,calc(100dvh - var(--build-notice-height,148px) - 248px)));
}

@media(max-height:600px) {
  .has-consent-banner.has-build-notice .build-notice-inner {min-height:0;padding:12px 44px}
  .has-consent-banner.has-build-notice .build-notice-inner p {font-size:20px}
}

/* Published videos use the channel's original local posters, without effects. */
.video-poster {position:relative;aspect-ratio:16/9;display:block;background:var(--surface)}
.video-poster img {width:100%;height:100%;display:block;object-fit:contain}
.video-duration {position:absolute;right:8px;bottom:8px;background:var(--bg);color:var(--ink);padding:4px 8px;font:500 13px/1.4 var(--mono)}
.video-meta {font-size:14px;color:var(--muted);margin:16px 0 8px}
.video-card .video-meta {font-size:13px}
.video-card h3 {margin-top:8px}
.video-card .text-link {margin-top:16px;font-size:15px}
.video-feature {display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center}
.video-feature h3 {font:600 clamp(28px,3vw,42px)/1.12 var(--display);margin:12px 0 20px}
.video-feature .button {margin-top:24px}
.more-videos {margin:48px 0 24px;font-size:24px}
.video-categories {display:flex;flex-wrap:wrap;gap:16px 32px;margin-bottom:32px}
.video-categories a {text-decoration:underline;text-underline-offset:6px}
.video-category {margin-bottom:72px;scroll-margin-top:110px}
.video-category>h2 {font-size:36px;margin-bottom:28px}
.shorts-section {margin-top:96px;scroll-margin-top:110px}
.shorts-section .section-head p {max-width:650px;margin-top:16px}
.shorts-grid {display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px}
.short-poster {aspect-ratio:9/16;position:relative;background:var(--surface);max-width:220px}
.short-poster img {display:block;width:100%;height:100%;object-fit:contain}
.short-card h3 {font-size:23px;margin:16px 0 12px}
.short-card p {font-size:15px;color:var(--muted);margin:12px 0}
.short-card .text-link {font-size:14px}
.video-page-head h1 {font-size:clamp(40px,5vw,72px);max-width:1100px}
.video-detail {padding-bottom:96px}
.video-detail>.video-meta {margin:0 0 24px}
.published-player {position:relative;aspect-ratio:16/9;min-height:0;padding:0;gap:0;border:0;overflow:hidden}
.published-player>img {display:block;width:100%;height:100%;object-fit:contain}
.player-activation {position:absolute;left:0;right:0;bottom:0;padding:20px;display:flex;justify-content:center;background:var(--bg)}
.player-activation p {margin:0;color:var(--ink)}
.player-disclosure {font-size:15px;color:var(--muted);max-width:900px;margin:20px 0 16px}
.player-disclosure a {text-decoration:underline}
.video-reading {display:grid;grid-template-columns:minmax(0,760px) minmax(240px,1fr);gap:80px;margin-top:64px}
.video-reading .article-body {min-width:0}
.video-reading .article-body section {scroll-margin-top:120px}
.video-reading .article-body li {margin:12px 0;color:var(--muted)}
.video-reading .article-body ul {padding-left:24px}
.video-chapters {align-self:start}
.video-chapters h2 {font-size:28px;margin-top:40px}
.video-chapters nav {display:flex;flex-direction:column;gap:12px}
.video-chapters ol {list-style:none;padding:0}
.video-chapters li {margin:16px 0;font-size:16px;line-height:1.5}
.video-chapters li span {font:500 13px var(--mono);color:var(--network);margin-right:8px}
.related-videos {margin-top:64px}
.related-videos>h2 {margin-bottom:32px}
@media(max-width:1000px) {
 .video-feature {grid-template-columns:1fr;gap:24px}
 .video-feature .video-poster {max-width:800px}
 .video-reading {grid-template-columns:minmax(0,1fr) 240px;gap:32px}
 .shorts-grid {grid-template-columns:repeat(2,minmax(0,1fr));gap:40px 24px}
}
@media(max-width:639px) {
 .video-reading {display:flex;flex-direction:column;gap:40px;margin-top:40px}
 .video-chapters {order:-1;width:100%}
 .video-chapters ol {columns:1}
 .video-category>h2 {font-size:30px}
 .player-activation {padding:10px}
 .player-activation .button {font-size:14px;padding:10px 14px;min-height:44px}
 .player-activation noscript p {font-size:12px}
 .short-card h3 {font-size:21px}
 .shorts-grid {gap:36px 16px}
}

/* Review corrections: one category control and shorter mobile library entry. */
.js .video-categories {display:none}
.video-library .video-card h3 {hyphens:none;overflow-wrap:break-word;text-wrap:pretty;line-height:1.12}
@media(max-width:639px) {
 .video-library-head {padding:28px 0 24px}
 .video-library-head .breadcrumb {margin-bottom:16px}
 .video-library-head>.lead {margin-top:16px}
 .video-library .filter-bar {flex-direction:row;align-items:flex-end;gap:16px;padding:0 0 24px}
 .video-library .filter-control {flex:1;min-width:0}
 .video-library .filter-control select {width:100%;min-width:0}
 .video-library .filter-status {white-space:nowrap;font-size:13px}
 .video-library .video-category>h2 {margin-bottom:20px}
}

/* Keep the restored corner control clear of the banner actions. */
.consent-banner .consent-inner {padding-bottom:84px}