:root {
  --ex-bg: #f4f6f3;
  --ex-surface: rgba(255, 255, 255, 0.82);
  --ex-surface-solid: #ffffff;
  --ex-ink: #122019;
  --ex-muted: #66726c;
  --ex-line: #d6ddd9;
  --ex-line-strong: #bdc9c3;
  --ex-accent: #176b4e;
  --ex-accent-strong: #0c4f38;
  --ex-accent-soft: #dfeee7;
  --ex-signal: #aa6428;
  --ex-signal-soft: #f8eadb;
  --ex-code: #0b1511;
  --ex-code-ink: #e8f2ed;
  --ex-shadow: 0 22px 64px rgba(17, 31, 24, 0.08);
  --ex-shadow-soft: 0 12px 34px rgba(17, 31, 24, 0.055);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ex-bg: #0b100e;
    --ex-surface: rgba(18, 26, 22, 0.84);
    --ex-surface-solid: #121a16;
    --ex-ink: #edf3f0;
    --ex-muted: #9eaaa4;
    --ex-line: #2a3530;
    --ex-line-strong: #3b4942;
    --ex-accent: #78c7a9;
    --ex-accent-strong: #9bd9c0;
    --ex-accent-soft: #173027;
    --ex-signal: #e6a465;
    --ex-signal-soft: #332419;
    --ex-code: #060b09;
    --ex-code-ink: #e8f2ed;
    --ex-shadow: none;
    --ex-shadow-soft: none;
  }
}

html { scroll-behavior: smooth; }
body.explainer-page {
  position: relative;
  overflow-x: hidden;
  background:
    linear-gradient(var(--ex-bg), var(--ex-bg));
  color: var(--ex-ink);
}
body.explainer-page::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    linear-gradient(color-mix(in srgb, var(--ex-line) 26%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--ex-line) 26%, transparent) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 720px);
  opacity: .7;
}
.page-glow {
  position: absolute;
  top: -180px;
  left: 50%;
  z-index: -1;
  width: min(1100px, 96vw);
  height: 680px;
  transform: translateX(-50%);
  pointer-events: none;
  background:
    radial-gradient(circle at 28% 36%, color-mix(in srgb, var(--ex-accent) 18%, transparent), transparent 42%),
    radial-gradient(circle at 76% 24%, color-mix(in srgb, var(--ex-signal) 13%, transparent), transparent 36%);
  filter: blur(20px);
}

.explainer-page main { max-width: 1240px; padding: 24px 32px 72px; }
.explainer-page a { color: inherit; }
.explainer-page button,
.explainer-page input { color: inherit; }

.site-nav {
  position: sticky;
  top: 14px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 0 64px;
  padding: 10px 12px 10px 14px;
  border: 1px solid color-mix(in srgb, var(--ex-line) 84%, transparent);
  border-radius: 16px;
  background: color-mix(in srgb, var(--ex-bg) 78%, transparent);
  box-shadow: 0 8px 28px rgba(17, 31, 24, 0.05);
  backdrop-filter: blur(18px) saturate(1.25);
  font-size: 14px;
}
.site-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.025em;
  text-decoration: none;
}
.site-mark-symbol {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 9px;
  background: var(--ex-ink);
  color: var(--ex-bg);
  font-size: 14px;
}
.site-links { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.site-links a { color: var(--ex-muted); text-decoration: none; transition: color .16s ease; }
.site-links a:hover { color: var(--ex-ink); }
.site-links .nav-github {
  padding: 8px 12px;
  border: 1px solid var(--ex-line);
  border-radius: 10px;
  color: var(--ex-ink);
  background: color-mix(in srgb, var(--ex-surface-solid) 74%, transparent);
}

.hero { margin: 0 0 50px; }
.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, .88fr);
  gap: clamp(36px, 6vw, 76px);
  align-items: center;
  min-height: 610px;
}
.hero-copy-block { padding: 26px 0 18px; }
.eyebrow {
  margin: 0 0 16px;
  color: var(--ex-accent);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  max-width: 830px;
  font-size: clamp(50px, 7vw, 92px);
  line-height: .95;
  letter-spacing: -.06em;
  font-weight: 850;
}
.hero h1 span { color: var(--ex-accent); }
.hero-copy {
  max-width: 720px;
  margin: 28px 0 0;
  color: var(--ex-muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.58;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 17px;
  border: 1px solid var(--ex-line);
  border-radius: 12px;
  text-decoration: none;
  font-weight: 760;
  background: var(--ex-surface);
  box-shadow: var(--ex-shadow-soft);
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
.button-link:hover { transform: translateY(-1px); border-color: var(--ex-line-strong); }
.button-link.primary { background: var(--ex-ink); color: var(--ex-bg); border-color: var(--ex-ink); }
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 28px;
  color: var(--ex-muted);
  font-size: 13px;
}
.hero-tags span { display: inline-flex; align-items: center; gap: 7px; }
.hero-tags span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--ex-accent);
}

.hero-map {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border: 1px solid var(--ex-line);
  border-radius: 28px;
  background:
    radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--ex-accent) 10%, transparent), transparent 42%),
    var(--ex-surface);
  box-shadow: var(--ex-shadow);
  backdrop-filter: blur(14px);
}
.hero-map::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(color-mix(in srgb, var(--ex-line) 70%, transparent) 1px, transparent 1px);
  background-size: 18px 18px;
  opacity: .28;
}
.hero-map > * { position: relative; }
.hero-map-label,
.topology-label,
.boundary-label {
  margin: 0 0 18px;
  color: var(--ex-muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.hero-map-row {
  display: grid;
  grid-template-columns: 1fr 58px 1.15fr 58px 1fr;
  gap: 8px;
  align-items: center;
  min-height: 200px;
}
.hero-map-node {
  min-height: 112px;
  padding: 15px;
  border: 1px solid var(--ex-line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--ex-surface-solid) 90%, transparent);
}
.hero-map-node .node-dot {
  display: block;
  width: 8px;
  height: 8px;
  margin-bottom: 22px;
  border-radius: 50%;
  background: var(--ex-accent);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--ex-accent) 12%, transparent);
}
.hero-map-node.service-node .node-dot { background: var(--ex-signal); box-shadow: 0 0 0 5px color-mix(in srgb, var(--ex-signal) 13%, transparent); }
.hero-map-node strong { display: block; font-size: 14px; letter-spacing: -.02em; }
.hero-map-node small { display: block; margin-top: 5px; color: var(--ex-muted); line-height: 1.35; }
.hero-map-link { position: relative; height: 1px; background: var(--ex-signal); }
.hero-map-link::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--ex-signal);
  border-right: 1px solid var(--ex-signal);
  transform: rotate(45deg);
}
.hero-map-link.reverse::after { right: auto; left: -1px; transform: rotate(-135deg); }
.hero-map-link span {
  position: absolute;
  left: 50%;
  bottom: 8px;
  transform: translateX(-50%);
  color: var(--ex-signal);
  font-size: 10px;
  font-weight: 750;
}
.hero-direct-line {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-top: 3px;
  color: var(--ex-accent);
  font-size: 12px;
  font-weight: 800;
}
.hero-direct-line::before,
.hero-direct-line::after { content: ""; height: 2px; flex: 1; background: var(--ex-accent); }
.hero-map > p { margin: 18px 2px 0; color: var(--ex-muted); font-size: 13px; line-height: 1.55; }

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ex-line);
  border-bottom: 1px solid var(--ex-line);
}
.principles article { padding: 28px 26px 30px 0; }
.principles article + article { padding-left: 26px; border-left: 1px solid var(--ex-line); }
.principle-number { color: var(--ex-accent); font: 750 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.principles h2 { margin: 13px 0 0; font-size: 21px; letter-spacing: -.025em; }
.principles p { margin: 9px 0 0; color: var(--ex-muted); font-size: 14px; line-height: 1.6; }

.section { margin-top: 112px; scroll-margin-top: 96px; }
.section-heading { max-width: 760px; margin-bottom: 32px; }
.section-heading h2 { margin: 0; font-size: clamp(34px, 5vw, 56px); letter-spacing: -.05em; line-height: 1.04; }
.section-heading > p { margin: 16px 0 0; color: var(--ex-muted); font-size: 18px; line-height: 1.6; }
.split-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, .65fr);
  gap: 44px;
  align-items: end;
  max-width: none;
}
.split-heading > p { margin: 0 0 4px; }

.mechanism-shell,
.topology-shell,
.boundary-shell,
.try-shell {
  border: 1px solid var(--ex-line);
  border-radius: 26px;
  background: var(--ex-surface);
  box-shadow: var(--ex-shadow);
  backdrop-filter: blur(12px);
}
.mechanism-shell { padding: clamp(22px, 4vw, 42px); }
.phase-controls { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 34px; }
.phase-button,
.topology-button {
  min-height: 40px;
  padding: 8px 13px;
  border: 1px solid var(--ex-line);
  border-radius: 11px;
  background: color-mix(in srgb, var(--ex-surface-solid) 54%, transparent);
  color: var(--ex-muted);
  font-size: 14px;
  font-weight: 750;
}
.phase-button:hover,
.topology-button:hover { border-color: var(--ex-line-strong); color: var(--ex-ink); }
.phase-button[aria-pressed="true"],
.topology-button[aria-pressed="true"] { background: var(--ex-ink); border-color: var(--ex-ink); color: var(--ex-bg); }

.mechanism-diagram {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 76px minmax(0, 1.08fr) 76px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 260px;
}
.mechanism-node {
  min-height: 166px;
  padding: 22px;
  border: 1px solid var(--ex-line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--ex-surface-solid) 44%, transparent);
  transition: border-color .2s ease, background .2s ease, transform .2s ease, opacity .2s ease;
}
.mechanism-kicker { display: block; margin: 0 0 24px !important; color: var(--ex-muted) !important; font-size: 10px !important; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.mechanism-node strong { display: block; font-size: 20px; letter-spacing: -.025em; }
.mechanism-node span { display: block; margin-top: 8px; color: var(--ex-muted); line-height: 1.5; }
.mechanism-node.server { text-align: center; }
.mechanism-arrow { position: relative; height: 1px; background: var(--ex-line-strong); }
.mechanism-arrow::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -4px;
  width: 8px;
  height: 8px;
  border-top: 1px solid currentColor;
  border-right: 1px solid currentColor;
  transform: rotate(45deg);
  color: var(--ex-line-strong);
}
.mechanism-peer-line { grid-column: 1 / -1; display: flex; align-items: center; gap: 14px; color: var(--ex-muted); font-size: 12px; font-weight: 700; }
.mechanism-peer-line::before,
.mechanism-peer-line::after { content: ""; height: 2px; flex: 1; background: var(--ex-line); }
.mechanism-shell[data-phase="create"] .server,
.mechanism-shell[data-phase="signal"] .server { border-color: var(--ex-signal); background: var(--ex-signal-soft); transform: translateY(-2px); }
.mechanism-shell[data-phase="signal"] .mechanism-arrow { background: var(--ex-signal); }
.mechanism-shell[data-phase="signal"] .mechanism-arrow::after { color: var(--ex-signal); }
.mechanism-shell[data-phase="direct"] .peer { border-color: var(--ex-accent); background: var(--ex-accent-soft); transform: translateY(-2px); }
.mechanism-shell[data-phase="direct"] .mechanism-peer-line { color: var(--ex-accent); }
.mechanism-shell[data-phase="direct"] .mechanism-peer-line::before,
.mechanism-shell[data-phase="direct"] .mechanism-peer-line::after { background: var(--ex-accent); }
.mechanism-shell[data-phase="direct"] .server { opacity: .48; }
.phase-explanation { margin: 28px 0 0; max-width: 800px; color: var(--ex-muted); line-height: 1.65; }
.phase-explanation strong { color: var(--ex-ink); }

.topology-shell { overflow: hidden; }
.topology-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; padding: 18px 20px; border-bottom: 1px solid var(--ex-line); }
.topology-choice { display: flex; gap: 8px; }
.player-control { display: grid; grid-template-columns: auto minmax(150px, 260px) auto; gap: 12px; align-items: center; color: var(--ex-muted); font-size: 13px; }
.player-control input { min-height: 0; padding: 0; accent-color: var(--ex-accent); }
.player-control output { min-width: 24px; color: var(--ex-ink); font-weight: 800; text-align: right; }
.topology-visual { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(250px, .75fr); min-height: 500px; }
.graph-stage {
  display: grid;
  place-items: center;
  min-height: 500px;
  padding: 18px;
  background-image: radial-gradient(circle at center, color-mix(in srgb, var(--ex-line) 60%, transparent) 1px, transparent 1px);
  background-size: 20px 20px;
}
#network-graph { width: 100%; height: 100%; min-height: 450px; overflow: visible; }
.graph-edge { stroke: var(--ex-line-strong); stroke-width: 1.1; vector-effect: non-scaling-stroke; }
.graph-edge.host-edge { stroke: color-mix(in srgb, var(--ex-accent) 70%, var(--ex-line)); stroke-width: 1.6; }
.graph-node { fill: var(--ex-surface-solid); stroke: var(--ex-ink); stroke-width: 1.4; vector-effect: non-scaling-stroke; }
.graph-node.host-node { fill: var(--ex-accent); stroke: var(--ex-accent); }
.graph-label { fill: var(--ex-ink); font-size: 11px; font-weight: 800; text-anchor: middle; dominant-baseline: central; }
.graph-label.host-label { fill: var(--ex-bg); }
.topology-copy { padding: 34px 30px; border-left: 1px solid var(--ex-line); display: flex; flex-direction: column; justify-content: center; }
.topology-copy h3 { margin: 0; font-size: 30px; letter-spacing: -.04em; }
.topology-result { margin: 15px 0 0; font-size: 17px; line-height: 1.55; }
.topology-note { margin: 14px 0 0; color: var(--ex-muted); line-height: 1.55; }

.boundary-shell { display: grid; grid-template-columns: 1fr 1fr; overflow: hidden; }
.boundary-column { padding: clamp(26px, 4vw, 38px); }
.boundary-column + .boundary-column { border-left: 1px solid var(--ex-line); }
.boundary-column h3 { margin: 0 0 20px; font-size: 25px; letter-spacing: -.035em; }
.boundary-column ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 13px; }
.boundary-column li { position: relative; padding-left: 23px; color: var(--ex-muted); line-height: 1.52; }
.boundary-column li::before { content: ""; position: absolute; left: 0; top: .61em; width: 7px; height: 7px; border-radius: 50%; background: var(--ex-accent); }
.boundary-column.server-side li::before { background: var(--ex-signal); }

.message-layout { display: grid; grid-template-columns: 1.05fr .95fr; gap: 24px; align-items: stretch; }
.message-flow { display: grid; gap: 0; border-top: 1px solid var(--ex-line); }
.flow-step { display: grid; grid-template-columns: 120px 1fr; gap: 20px; align-items: start; padding: 21px 0; border-bottom: 1px solid var(--ex-line); }
.flow-step span { color: var(--ex-muted); font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; }
.flow-step strong { display: block; font-size: 19px; line-height: 1.38; }
.code-sample { overflow: hidden; border-radius: 22px; background: var(--ex-code); color: var(--ex-code-ink); box-shadow: var(--ex-shadow-soft); }
.code-sample-bar { display: flex; justify-content: space-between; gap: 16px; padding: 13px 18px; border-bottom: 1px solid color-mix(in srgb, var(--ex-code-ink) 13%, transparent); color: color-mix(in srgb, var(--ex-code-ink) 62%, transparent); font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
.code-sample pre { margin: 0; padding: 24px; font: 14px/1.7 ui-monospace, SFMono-Regular, Menlo, monospace; }
.code-caption { margin: 13px 0 0; color: var(--ex-muted); line-height: 1.58; }
.channel-table { width: 100%; border-collapse: collapse; margin-top: 26px; }
.channel-table th,
.channel-table td { padding: 17px 12px; border-bottom: 1px solid var(--ex-line); text-align: left; vertical-align: top; }
.channel-table th { color: var(--ex-muted); font-size: 11px; text-transform: uppercase; letter-spacing: .09em; }
.channel-table td { line-height: 1.5; }
.channel-table td:first-child { width: 16%; font-weight: 800; color: var(--ex-ink); }
.channel-table tr:last-child td { border-bottom: 0; }

.try-shell { padding: clamp(22px, 4vw, 34px); }
.endpoint-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; max-width: 760px; }
.endpoint-row label { font-size: 13px; color: var(--ex-muted); }
.endpoint-row input { width: 100%; background: var(--ex-bg); color: var(--ex-ink); border-color: var(--ex-line); border-radius: 11px; }
.endpoint-row button { align-self: end; border-radius: 11px; background: var(--ex-ink); color: var(--ex-bg); border-color: var(--ex-ink); font-weight: 750; }
.endpoint-status { min-height: 1.4em; margin: 9px 0 0; color: var(--ex-muted); font-size: 13px; }
.demo-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 24px; }
.demo-link {
  position: relative;
  min-height: 190px;
  padding: 22px;
  border: 1px solid var(--ex-line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--ex-surface-solid) 42%, transparent);
  text-decoration: none;
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
.demo-link:hover { transform: translateY(-2px); border-color: var(--ex-accent); background: color-mix(in srgb, var(--ex-accent-soft) 38%, var(--ex-surface-solid)); }
.demo-index { display: block; color: var(--ex-accent); font: 750 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.demo-link strong { display: block; margin-top: 24px; font-size: 22px; letter-spacing: -.03em; }
.demo-link > span:not(.demo-index) { display: block; max-width: 440px; margin-top: 7px; color: var(--ex-muted); line-height: 1.5; }
.demo-link em { position: absolute; right: 20px; bottom: 19px; color: var(--ex-ink); font-size: 13px; font-style: normal; font-weight: 750; }

.footer { display: flex; justify-content: space-between; gap: 28px; flex-wrap: wrap; margin-top: 108px; padding-top: 25px; border-top: 1px solid var(--ex-line); color: var(--ex-muted); font-size: 13px; }
.footer > div { display: flex; gap: 10px 18px; flex-wrap: wrap; }
.footer strong { color: var(--ex-ink); }
.footer-links a { color: var(--ex-ink); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

.phase-button:focus-visible,
.topology-button:focus-visible,
.button-link:focus-visible,
.demo-link:focus-visible,
.site-nav a:focus-visible,
.endpoint-row input:focus-visible,
.endpoint-row button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--ex-accent) 40%, transparent);
  outline-offset: 3px;
}

@media (max-width: 980px) {
  .site-links a:not(.nav-github) { display: none; }
  .hero-layout { grid-template-columns: 1fr; min-height: 0; }
  .hero-map { max-width: 760px; }
  .principles { grid-template-columns: 1fr; }
  .principles article { padding: 24px 0; }
  .principles article + article { padding-left: 0; border-left: 0; border-top: 1px solid var(--ex-line); }
  .split-heading { grid-template-columns: 1fr; gap: 16px; }
  .split-heading > p { max-width: 720px; }
  .message-layout { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .explainer-page main { padding: 18px 18px 58px; }
  .site-nav { top: 8px; margin-bottom: 46px; }
  .site-mark span:last-child { max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .hero h1 { font-size: clamp(48px, 13vw, 72px); }
  .mechanism-diagram { grid-template-columns: 1fr; gap: 12px; }
  .mechanism-arrow { width: 1px; height: 34px; justify-self: center; }
  .mechanism-arrow::after { right: -4px; top: auto; bottom: -1px; transform: rotate(135deg); }
  .mechanism-peer-line { display: none; }
  .topology-visual { grid-template-columns: 1fr; }
  .topology-copy { border-left: 0; border-top: 1px solid var(--ex-line); }
  .graph-stage { min-height: 390px; }
  #network-graph { min-height: 350px; }
  .boundary-shell { grid-template-columns: 1fr; }
  .boundary-column + .boundary-column { border-left: 0; border-top: 1px solid var(--ex-line); }
  .demo-list { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .site-nav { padding: 9px 10px; }
  .site-links .nav-github { padding: 7px 9px; }
  .hero-map { padding: 18px; border-radius: 22px; }
  .hero-map-row { grid-template-columns: 1fr; min-height: 0; }
  .hero-map-link { width: 1px; height: 28px; justify-self: center; }
  .hero-map-link::after { right: -3px; top: auto; bottom: -1px; transform: rotate(135deg); }
  .hero-map-link.reverse::after { left: -3px; bottom: -1px; transform: rotate(135deg); }
  .hero-map-link span { left: 11px; bottom: 8px; transform: none; writing-mode: vertical-rl; }
  .hero-map-node { min-height: 96px; }
  .hero-map-node .node-dot { margin-bottom: 14px; }
  .hero-direct-line { margin-top: 18px; }
  .section { margin-top: 86px; }
  .section-heading h2 { font-size: 38px; }
  .topology-toolbar { align-items: stretch; }
  .topology-choice { width: 100%; }
  .topology-button { flex: 1; }
  .player-control { width: 100%; grid-template-columns: auto 1fr auto; }
  .flow-step { grid-template-columns: 1fr; gap: 7px; }
  .channel-table { display: block; overflow-x: auto; }
  .endpoint-row { grid-template-columns: 1fr; }
  .endpoint-row button { width: 100%; }
  .demo-link { min-height: 180px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}