:root {
  --bg: #f8f7fd;
  --bg-2: #ffffff;
  --fg: #1c1a2e;
  --muted: #5e5b78;
  --rule: #e2dff0;
  --code-bg: #f1eefb;
  --code-fg: #2a2742;
  --accent: #5b3fd6;
  --accent-2: #0b8f86;
  --accent-3: #d4570f;
  --on-accent: #ffffff;
  --note-bg: #f0ecff;
  --note-rule: #a896f2;

  /* Protocol message colours, shared by code samples and the demo. */
  --t-element: #6a46e0;
  --t-signal: #0b8f86;
  --t-remove: #cc2f62;
  --t-action: #d4570f;
  --t-hello: #1f6fd1;
  --t-key: #7a4fb8;
  --t-str: #1d7a4a;
  --t-num: #b0420f;

  --glow:
    radial-gradient(60rem 26rem at 10% -10%, rgb(124 92 255 / 0.16), transparent 60%),
    radial-gradient(50rem 24rem at 95% 0%, rgb(20 184 166 / 0.14), transparent 60%);
  --brand: linear-gradient(90deg, #6a46e0, #0b8f86 55%, #d4570f);

  --wide: 92rem;
  --measure: 48rem;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #110f1a;
    --bg-2: #181624;
    --fg: #e9e7f5;
    --muted: #a3a0bd;
    --rule: #2c2942;
    --code-bg: #1a1828;
    --code-fg: #dcd9ee;
    --accent: #a593ff;
    --accent-2: #4fd1c5;
    --accent-3: #ff9e66;
    --on-accent: #120f1f;
    --note-bg: #1e1a33;
    --note-rule: #5a4bb0;

    --t-element: #b3a2ff;
    --t-signal: #5fd8cb;
    --t-remove: #ff7aa3;
    --t-action: #ffa66e;
    --t-hello: #7cb4ff;
    --t-key: #d0a8ff;
    --t-str: #8fdba8;
    --t-num: #ffc48a;

    --glow:
      radial-gradient(60rem 26rem at 10% -10%, rgb(124 92 255 / 0.2), transparent 60%),
      radial-gradient(50rem 24rem at 95% 0%, rgb(20 184 166 / 0.13), transparent 60%);
    --brand: linear-gradient(90deg, #a593ff, #4fd1c5 55%, #ff9e66);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  background:
    var(--glow) no-repeat,
    var(--bg);
  color: var(--fg);
  font: 16px/1.6 var(--sans);
}

a {
  color: var(--accent);
  text-underline-offset: 2px;
}
::selection {
  background: color-mix(in srgb, var(--accent) 28%, transparent);
}

/* --- header & footer ------------------------------------------------------ */

header.site {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
@media (max-width: 700px) {
  header.site {
    position: static;
  }
}
header.site::before {
  content: "";
  display: block;
  height: 3px;
  background: var(--brand);
}

header.site .inner,
main,
footer.site .inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}

header.site .inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 24px;
  padding-top: 12px;
  padding-bottom: 12px;
}

header.site .name {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  margin-right: auto;
}
header.site .name::before {
  content: "";
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: url("logo.svg") center / contain no-repeat;
  box-shadow: 0 2px 10px rgb(106 70 224 / 0.35);
}

header.site nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
}

header.site nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  padding: 4px 10px;
  border-radius: 999px;
}

header.site nav a:hover {
  color: var(--fg);
  background: var(--code-bg);
}
header.site nav a[aria-current="page"] {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  font-weight: 600;
}

footer.site {
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}
footer.site .inner {
  padding-top: 16px;
  padding-bottom: 24px;
}

/* --- typography ----------------------------------------------------------- */

main {
  padding-top: 40px;
  padding-bottom: 72px;
}

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  font-weight: 650;
}
h1 {
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  margin: 0 0 0.6rem;
  letter-spacing: -0.01em;
}
h2 {
  font-size: 1.4rem;
  margin: 2.8rem 0 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--rule);
}
h3 {
  font-size: 1.12rem;
  margin: 2rem 0 0.6rem;
}
h4 {
  font-size: 1rem;
  margin: 1.4rem 0 0.4rem;
}

h2 .num,
h3 .num {
  display: inline-block;
  min-width: 1.8em;
  margin-right: 0.5em;
  padding: 0 0.4em;
  border-radius: 6px;
  text-align: center;
  font: 600 0.8em/1.6 var(--mono);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  vertical-align: 0.12em;
}
h3 .num {
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
}

.lede {
  font-size: 1.15rem;
  color: var(--muted);
  margin-top: 0;
  max-width: 52rem;
}

p,
ul,
ol,
table,
pre,
dl {
  margin: 0 0 1rem;
}
li {
  margin: 0.2rem 0;
}
li::marker {
  color: var(--accent);
}

code,
pre,
kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}

:not(pre) > code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 0.08em 0.36em;
  border-radius: 4px;
  border: 1px solid var(--rule);
  overflow-wrap: anywhere;
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 14px 16px;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  overflow-x: auto;
  line-height: 1.55;
}

pre .c {
  color: var(--muted);
  font-style: italic;
}

/* Protocol highlighting, applied by site.js. */
.hl-tag {
  font-weight: 700;
}
.hl-tag.t-element {
  color: var(--t-element);
}
.hl-tag.t-signal {
  color: var(--t-signal);
}
.hl-tag.t-remove {
  color: var(--t-remove);
}
.hl-tag.t-action {
  color: var(--t-action);
}
.hl-tag.t-hello {
  color: var(--t-hello);
}
.hl-key {
  color: var(--t-key);
}
.hl-str {
  color: var(--t-str);
}
.hl-num {
  color: var(--t-num);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.94rem;
  display: block;
  overflow-x: auto;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 7px 12px 7px 0;
  border-bottom: 1px solid var(--rule);
}

th {
  font-weight: 650;
  white-space: nowrap;
  color: var(--accent);
}
td code {
  white-space: nowrap;
}
tr.common td {
  color: var(--muted);
  font-size: 0.92em;
}
tr.common:has(+ tr:not(.common)) td {
  border-bottom: 2px solid var(--rule);
}

.note {
  background: var(--note-bg);
  border-left: 3px solid var(--note-rule);
  border-radius: 0 8px 8px 0;
  padding: 10px 14px;
  margin: 0 0 1rem;
}
.note > :last-child {
  margin-bottom: 0;
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

dl dt {
  font-weight: 650;
  margin-top: 0.8rem;
}
dl dd {
  margin: 0.2rem 0 0 0;
}

.flow {
  display: grid;
  gap: 4px;
}
.flow .dir {
  color: var(--muted);
  font-size: 0.85rem;
  font-family: var(--mono);
}

/* --- documentation pages: header, sidebar contents, article --------------- */

main.doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0 56px;
}

.doc-head {
  padding-bottom: 8px;
}

.toc {
  border: 1px solid var(--rule);
  background: var(--bg-2);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 1rem 0 1.5rem;
  font-size: 0.93rem;
}
.toc-title {
  margin: 0 0 6px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.toc ol {
  margin: 0;
  padding-left: 1.4rem;
}
.toc ol ol {
  margin: 0.1rem 0 0.3rem;
  padding-left: 0.9rem;
  list-style: none;
  border-left: 1px solid var(--rule);
}
.toc ol ol li {
  margin: 0;
}
.toc ol ol a {
  font: 0.86rem/1.7 var(--mono);
}
.toc a {
  text-decoration: none;
}
.toc a:hover {
  text-decoration: underline;
}
.toc a.active {
  font-weight: 650;
}

.prose {
  min-width: 0;
  max-width: 60rem;
}
.prose > h2:first-child {
  margin-top: 1rem;
}

@media (min-width: 1000px) {
  main.doc {
    grid-template-columns: 16rem minmax(0, 1fr);
    grid-template-areas: "toc head" "toc body";
    align-items: start;
  }
  .doc-head {
    grid-area: head;
  }
  .prose {
    grid-area: body;
  }
  .toc {
    grid-area: toc;
    position: sticky;
    top: 84px;
    margin: 0;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
  }
}

/* --- landing page --------------------------------------------------------- */

main.home {
  padding-top: 24px;
}

.hero {
  padding: 36px 0 12px;
}
@media (min-width: 1000px) {
  .hero {
    padding: 56px 0 20px;
  }
}
.hero .lede {
  font-size: clamp(1.15rem, 1.8vw, 1.4rem);
  max-width: 46rem;
  color: var(--fg);
}
.hero h1 {
  font-family: var(--mono);
  font-size: clamp(2.4rem, 6vw, 4rem);
  background: var(--brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.4rem;
}
.hero .lede strong {
  font-weight: 650;
}
.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 1.4rem 0 0;
}
.btn {
  padding: 8px 18px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
}
.btn:hover {
  border-color: var(--accent);
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.btn.primary:hover {
  background: color-mix(in srgb, var(--accent) 85%, var(--fg));
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.band {
  margin-top: 2.6rem;
}
.band > h2,
.band h2 {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
  font-size: 1.5rem;
}
.band > p {
  max-width: 60rem;
}

.cards {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
}
/* The session walkthrough */
.session {
  margin-top: 1.6rem;
}
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}
.step {
  --c: var(--accent);
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px 48px;
  padding: 0 0 34px 48px;
  margin: 0;
}
@media (min-width: 1000px) {
  .step {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  }
}
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--c);
  color: var(--on-accent);
  font: 700 0.85rem/30px var(--mono);
  text-align: center;
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--c) 18%, transparent);
}
.step::after {
  content: "";
  position: absolute;
  left: 14px;
  top: 40px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--c), var(--rule));
}
.step-text p,
.step-text ul {
  margin: 0 0 0.6rem;
}
.step-text p:first-child {
  margin-top: 3px;
}
.step-text ul {
  padding-left: 1.2rem;
}
.step-code {
  min-width: 0;
}
.step-code .dir {
  display: block;
  font: 600 0.72rem var(--mono);
  letter-spacing: 0.04em;
  color: var(--c);
  margin: 4px 0 4px;
}
.step-code pre {
  margin: 0;
  font-size: 0.8rem;
  background: var(--bg-2);
  border-left-color: var(--c);
  white-space: pre-wrap;
}

/* Coloured emphasis in prose */
.k {
  --k: var(--accent);
  color: var(--k);
  font-weight: 650;
}
a.k {
  text-decoration-color: color-mix(in srgb, var(--k) 45%, transparent);
}
.k-accent {
  --k: var(--accent);
}
.k-element {
  --k: var(--t-element);
}
.k-signal {
  --k: var(--t-signal);
}
.k-action {
  --k: var(--t-action);
}
.k-remove {
  --k: var(--t-remove);
}
.k-hello {
  --k: var(--t-hello);
}

.cards.three {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
}
.cards.two {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 30rem), 1fr));
}
.t-element {
  --c: var(--t-element);
}
.t-signal {
  --c: var(--t-signal);
}
.t-remove {
  --c: var(--t-remove);
}
.t-action {
  --c: var(--t-action);
}
.t-hello {
  --c: var(--t-hello);
}

.card {
  --c: var(--accent);
  position: relative;
  border: 1px solid var(--rule);
  background: var(--bg-2);
  border-radius: 12px;
  padding: 16px 18px 14px;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--c);
}
.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}
.card p {
  margin: 0;
  font-size: 0.95rem;
}

/* The "why" box */
.pitch {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px 48px;
  padding: 26px 22px;
  border: 1px solid var(--rule);
  border-radius: 16px;
  background:
    radial-gradient(
      40rem 18rem at 100% 0%,
      color-mix(in srgb, var(--accent-2) 10%, transparent),
      transparent 70%
    ),
    radial-gradient(
      40rem 18rem at 0% 100%,
      color-mix(in srgb, var(--accent) 10%, transparent),
      transparent 70%
    ),
    var(--bg-2);
  overflow: hidden;
}
.pitch::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--brand);
}
@media (min-width: 1000px) {
  .pitch {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    padding: 34px 38px;
    align-items: center;
  }
}
.pitch-text > h2 {
  margin-bottom: 0.8rem;
}
.pitch-text p:last-child {
  margin-bottom: 0;
}
.pitch-claim {
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: var(--note-bg);
}

.parts {
  margin: 0;
}
.parts-claim {
  margin: 0 0 16px;
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  line-height: 1.3;
  font-weight: 700;
}
.parts-mock {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  align-items: center;
  gap: 10px 14px;
  padding: 16px;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--bg);
}
.pm-label {
  font: 600 0.75rem var(--mono);
  color: var(--muted);
  text-align: right;
}
.pm-text {
  font-weight: 600;
}
.pm-list {
  display: grid;
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
}
.pm-list span {
  padding: 4px 10px;
  font-size: 0.9rem;
}
.pm-list span + span {
  border-top: 1px solid var(--rule);
}
.pm-list span:first-child {
  background: var(--note-bg);
}
.pm-input {
  padding: 5px 10px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--bg-2);
  font: 0.9rem var(--mono);
  max-width: 10rem;
}
.pm-button {
  justify-self: start;
  padding: 5px 16px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  font-size: 0.9rem;
}

/* --- live samples (samples.js) --------------------------------------------- */

.sample {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0 0 1rem;
}
@media (min-width: 900px) {
  .sample {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  }
}
.sample-src {
  margin: 0;
  grid-column: 1 / -1;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.sample-app {
  position: relative;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--t-element);
  border-radius: 10px;
  padding: 16px;
  background: var(--bg);
  align-self: start;
}
.sample-wire-pane {
  position: relative;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--t-signal);
  border-radius: 10px;
  background: var(--code-bg);
  padding: 4px;
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.sample-wire {
  max-height: 16rem;
  overflow: auto;
}
.sample-wire .entry {
  cursor: default;
}
.sample-wire .entry.open {
  white-space: normal;
  flex-wrap: wrap;
}
.sample-wire .entry.open .raw {
  flex-basis: 100%;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  opacity: 1;
  padding-left: 1.6em;
}
.sample-wire .entry:has(.raw) {
  cursor: pointer;
}
.sample .he-dialog {
  position: static;
  width: auto;
  max-width: 100%;
  margin: 12px 0 0;
  box-shadow: 0 10px 30px -14px rgb(40 20 120 / 0.45);
}

/* --- component headings (components page) ---------------------------------- */

h3.component {
  font: 650 1.45rem/1.25 var(--mono);
  margin: 3rem 0 0.7rem;
  padding: 0.2rem 0 0.2rem 0.75rem;
  border-left: 4px solid var(--accent);
}
h3.component a {
  color: var(--accent);
  text-decoration: none;
}
h3.component a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}
h3.component a::after {
  content: " #";
  color: var(--muted);
  opacity: 0;
  transition: opacity 0.15s;
}
h3.component:hover a::after {
  opacity: 1;
}

a.expr {
  display: inline-block;
  padding: 0 0.45em;
  border-radius: 999px;
  font: 600 0.78em/1.6 var(--mono);
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
  text-decoration: none;
  white-space: nowrap;
}
a.expr:hover {
  background: color-mix(in srgb, var(--accent-2) 22%, transparent);
}

.sample-signals {
  margin: 0;
  border-top: 3px solid var(--t-signal);
}
.sample-signals::before {
  content: "signals";
  display: block;
  font: 600 0.72rem var(--mono);
  color: var(--t-signal);
  margin-bottom: 4px;
}
.sample-signals.changed {
  animation: signals-changed 0.6s ease-out;
}
@keyframes signals-changed {
  from {
    background: color-mix(in srgb, var(--t-signal) 22%, var(--code-bg));
  }
}
.sample-side {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-self: start;
  min-width: 0;
}

/* --- overview: alternating example ---------------------------------------- */

/* The inline script in index.html picks one; without it the basil example shows. */
html[data-example]:not([data-example="basil"]) [data-ex="basil"],
html:not([data-example="table"]) [data-ex="table"],
html:not([data-example="expense"]) [data-ex="expense"] {
  display: none;
}

/* --- overview: renderers fan-out ------------------------------------------- */

.fanout {
  --warn: #d69214;
  --fork: color-mix(in srgb, var(--muted) 45%, var(--rule));
  margin: 1.4rem 0 0;
}
.fan-src {
  width: fit-content;
  margin: 0 auto;
  padding: 6px 16px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bg-2);
  font: 0.85rem var(--mono);
}
.screens {
  position: relative;
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 22px;
}
@media (min-width: 900px) {
  .screens {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 0;
    padding-top: 34px;
  }
  /* The fork from the message pill down to each screen. */
  .screens::before {
    content: "";
    position: absolute;
    top: 14px;
    left: 16.6%;
    right: 16.6%;
    height: 20px;
    border: 2px solid var(--fork);
    border-bottom: 0;
    border-radius: 12px 12px 0 0;
    background: linear-gradient(var(--fork), var(--fork)) center / 2px 100% no-repeat;
  }
  .screens::after {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 14px;
    background: var(--fork);
  }
}
.screen {
  min-width: 0;
  display: grid;
  grid-template-rows: 1fr auto;
  justify-items: center;
  align-items: start;
}
.s-frame {
  width: 100%;
  max-width: 21rem;
  overflow: hidden;
}
.s-name {
  margin: 10px 0 0;
  font-weight: 650;
}
.s-name span {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.88rem;
}
.s-name span::before {
  content: "· ";
}

.s-web .s-frame {
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--bg-2);
  box-shadow: 0 14px 30px -20px rgb(40 20 120 / 0.45);
}
.s-chrome {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--rule);
  background: var(--code-bg);
}
.s-chrome i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--rule);
}
.s-chrome span {
  margin-left: 8px;
  padding: 1px 10px;
  border-radius: 6px;
  background: var(--bg-2);
  font: 0.72rem var(--mono);
  color: var(--muted);
}
.s-web .s-body {
  display: grid;
  gap: 10px;
  padding: 18px;
}
.sw-h2 {
  font-size: 1.3rem;
  font-weight: 700;
}
.sw-row {
  display: flex;
  gap: 8px;
}
.sw-btn {
  padding: 5px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
}
.sw-btn.primary {
  background: var(--accent);
  color: var(--on-accent);
}
.sw-btn.plain {
  color: var(--accent);
}
.sw-caption {
  font-size: 0.85rem;
  color: var(--muted);
}
.sw-seg {
  display: flex;
  width: fit-content;
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
  font-size: 0.85rem;
}
.sw-seg span {
  padding: 4px 12px;
}
.sw-seg span + span {
  border-left: 1px solid var(--rule);
}
.sw-seg .on {
  background: color-mix(in srgb, var(--accent) 14%, var(--bg-2));
  color: var(--accent);
  font-weight: 600;
}
.sw-field {
  display: grid;
  gap: 3px;
  font-size: 0.88rem;
}
.sw-field small {
  color: var(--muted);
  font-size: 0.78rem;
}
.sw-field span {
  padding: 6px 10px 18px;
  border: 1px solid var(--rule);
  border-radius: 8px;
}
.sw-field .line {
  padding-bottom: 6px;
}
.sw-field .sw-select {
  width: fit-content;
  min-width: 8rem;
}
.sw-field .sw-select::after {
  content: "▾";
  float: right;
  margin-left: 10px;
  color: var(--muted);
}
.sw-notice {
  padding: 7px 12px;
  border-left: 3px solid var(--warn);
  border-radius: 0 6px 6px 0;
  background: color-mix(in srgb, var(--warn) 12%, var(--bg-2));
  font-size: 0.9rem;
}

.s-term .s-frame {
  border-radius: 8px;
  border: 1px solid var(--rule);
  background: #16141f;
  box-shadow: 0 14px 30px -20px rgb(0 0 0 / 0.6);
}
.st-body {
  margin: 0;
  border: 0;
  border-radius: 0;
  padding: 16px 18px;
  background: transparent;
  color: #d8d4ea;
  font-size: 0.82rem;
  white-space: pre;
}
.st-body b {
  color: #fff;
}
.st-rule,
.st-dim {
  color: #8a86a3;
}
.st-focus {
  background: #d8d4ea;
  color: #16141f;
}
.st-warn {
  color: #f0b545;
}

.s-phone .s-frame {
  position: relative;
  max-width: 11.5rem;
  aspect-ratio: 9 / 19;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 8px 12px 10px;
  border: 6px solid var(--fg);
  border-radius: 32px;
  background: linear-gradient(115deg, rgb(255 255 255 / 0.22), transparent 38%), var(--bg-2);
  /* Tilted in 3D; the stacked shadows are the phone's side, then its shadow on the page. */
  --edge: color-mix(in srgb, var(--fg) 72%, var(--bg));
  transform: perspective(1100px) rotateY(-22deg) rotateX(8deg) rotateZ(1deg);
  box-shadow:
    1px 1px 0 var(--edge),
    2px 2px 0 var(--edge),
    3px 3px 0 var(--edge),
    4px 3px 0 var(--edge),
    5px 4px 0 var(--edge),
    6px 4px 0 var(--edge),
    30px 34px 40px -14px rgb(20 10 60 / 0.35);
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.s-phone .s-frame:hover {
  transform: perspective(1100px) rotateY(-6deg) rotateX(3deg);
}
@media (prefers-reduced-motion: reduce) {
  .s-phone .s-frame {
    transition: none;
  }
}
/* Camera island and home indicator. */
.s-phone .s-frame::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  width: 3.2rem;
  height: 14px;
  margin-left: -1.6rem;
  border-radius: 999px;
  background: var(--fg);
}
.s-phone .s-frame::after {
  content: "";
  align-self: center;
  width: 40%;
  height: 4px;
  margin-top: auto;
  border-radius: 999px;
  background: var(--fg);
  opacity: 0.8;
}
.sp-status {
  display: flex;
  justify-content: space-between;
  padding: 0 6px;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}
.sp-title {
  margin-top: 10px;
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.sp-notice {
  padding: 7px 8px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--warn) 16%, var(--bg-2));
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
}
.sp-seg {
  display: flex;
  padding: 2px;
  border-radius: 9px;
  background: var(--code-bg);
  font-size: 0.72rem;
}
.sp-seg span {
  flex: 1;
  padding: 4px 0;
  border-radius: 7px;
  text-align: center;
}
.sp-seg .on {
  background: var(--bg-2);
  font-weight: 700;
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.18);
}
.sp-field {
  display: grid;
  gap: 2px;
  padding: 7px 10px;
  border-radius: 10px;
  background: var(--code-bg);
  font-size: 0.78rem;
}
.sp-field small {
  color: var(--muted);
  font-size: 0.65rem;
}
.sp-pick {
  display: flex;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: 10px;
  background: var(--code-bg);
  font-size: 0.78rem;
}
.sp-pick span + span {
  color: var(--muted);
}
.sp-btn {
  padding: 8px;
  border-radius: 12px;
  font-size: 0.92rem;
  background: var(--accent-2);
  color: var(--on-accent);
  text-align: center;
  font-weight: 600;
}
.sp-link {
  text-align: center;
  color: var(--accent-2);
  font-weight: 500;
}
.sp-foot {
  font-size: 0.72rem;
  color: var(--muted);
  text-align: center;
}

.fanout figcaption {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 60rem;
}

/* --- overview: transports ------------------------------------------------- */

.plugs {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 13rem), 1fr));
}
.plugs li {
  margin: 0;
  display: grid;
  padding: 10px 14px 10px 26px;
  position: relative;
  border: 1px dashed color-mix(in srgb, var(--accent-2) 55%, var(--rule));
  border-radius: 10px;
}
.plugs li::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 16px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-2) 20%, transparent);
}
.plugs b {
  font: 700 0.9rem var(--mono);
}
.plugs span {
  font-size: 0.85rem;
  color: var(--muted);
}

/* --- overview: non-use cases ---------------------------------------------- */

.quiet {
  color: var(--muted);
}
.quiet > h2 {
  color: var(--fg);
}
.quiet ul {
  list-style: none;
  padding: 0;
  max-width: 60rem;
}
.quiet li {
  margin: 0.6rem 0;
  padding-left: 1.6rem;
  position: relative;
}
.quiet li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3em;
  width: 1em;
  height: 1em;
  background: currentColor;
  opacity: 0.7;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M5.6 5.6l12.8 12.8'/%3E%3C/svg%3E")
    center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M5.6 5.6l12.8 12.8'/%3E%3C/svg%3E")
    center / contain no-repeat;
}
.quiet strong {
  color: var(--fg);
}

/* --- overview: hypermedia ------------------------------------------------- */

.hyper-lead {
  margin: 0 0 1.4rem;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
}
.hyper-lead em {
  font-style: normal;
  font-weight: 800;
  background: var(--brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tenets {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 900px) {
  .tenets {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.tenets li {
  --c: var(--accent);
  margin: 0;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--c);
  border-radius: 12px;
  background: linear-gradient(color-mix(in srgb, var(--c) 7%, var(--bg-2)), var(--bg-2) 70%);
}
.tenets h3 {
  margin: 0 0 0.4rem;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}
.tenets p {
  margin: 0;
  font-size: 0.95rem;
}

/* --- overview: principles ---------------------------------------------------- */

#principles .manifesto {
  max-width: 48rem;
}

.manifesto {
  list-style: none;
  counter-reset: rule;
  margin: 1.2rem 0 0;
  padding: 0;
}
.manifesto li {
  counter-increment: rule;
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  align-content: start;
  column-gap: 14px;
  margin: 0;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
}
.manifesto li::before {
  content: counter(rule, decimal-leading-zero);
  grid-row: span 2;
  font: 800 2.4rem/1 var(--mono);
  color: var(--accent);
}
.manifesto h3 {
  margin: 0 0 0.2rem;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}
.manifesto p {
  margin: 0;
  color: var(--muted);
}

/* --- overview: accessibility ------------------------------------------------- */

.a11y {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px 48px;
  padding: 26px 22px;
  border-radius: 16px;
  border: 1px solid var(--rule);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-2));
}
@media (min-width: 1000px) {
  .a11y {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    padding: 34px 38px;
    align-items: center;
  }
}
.a11y h2 {
  margin-bottom: 0.8rem;
}
.a11y-text p:last-child {
  margin-bottom: 0;
}
.spoken {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.spoken li {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 6px 14px;
  align-items: center;
}
@media (max-width: 600px) {
  .spoken li {
    grid-template-columns: minmax(0, 1fr);
  }
}
.spoken code {
  justify-self: start;
  background: var(--bg-2) !important;
  color: var(--muted) !important;
  font-size: 0.78rem;
}
.spoken q {
  position: relative;
  justify-self: start;
  padding: 7px 14px 7px 34px;
  border-radius: 14px 14px 14px 4px;
  background: color-mix(in srgb, var(--accent) 14%, var(--bg-2));
  color: var(--fg);
  font-weight: 600;
  quotes: none;
}
/* A small speaker glyph. */
.spoken q::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  background: var(--accent);
  clip-path: polygon(0 30%, 30% 30%, 70% 0, 70% 100%, 30% 70%, 0 70%);
  opacity: 0.8;
}