/* Hallmark · macrostructure: Split Studio · tone: Technical · anchor hue: signal blue
 * theme: custom · vibe: a physical instrument for your agent
 * paper: oklch(99% .002 260) · accent: oklch(51% .21 264)
 * fonts: Geist + Geist Mono · axes: light paper / geometric type / signal blue
 * pre-emit critique: P4 H4 E4 S4 R4 V4
 * enrichment: original device evidence · nav: N9 · footer: Ft2
 */
@import url('tokens.css');
@font-face { font-family: 'Geist'; src: url('assets/geist.woff2') format('woff2'); font-weight: 100 900; font-display: swap; }
@font-face { font-family: 'Geist Mono'; src: url('assets/geist-mono.woff2') format('woff2'); font-weight: 100 900; font-display: swap; }
* { box-sizing: border-box; }
html, body { overflow-x: clip; }
html { scroll-padding-top: var(--space-xl); }
body { margin: 0; color: var(--color-ink); background: var(--color-paper); font-family: var(--font-body); font-size: var(--text-base); line-height: 1.6; -webkit-font-smoothing: antialiased; }
::selection { background: var(--color-accent); color: var(--color-paper); }
[hidden] { display: none !important; }
h1, h2, h3, h4, p, figure, blockquote, pre, dl, dd { margin: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.12; font-weight: 650; letter-spacing: -.045em; text-wrap: balance; overflow-wrap: anywhere; min-width: 0; }
h1 { font-size: var(--text-display); line-height: 1.03; letter-spacing: -.065em; font-weight: 650; }
h2 { font-size: var(--text-heading); }
h3, h4 { font-size: var(--text-lede); letter-spacing: -.025em; }
p { max-width: 68ch; }
a { color: inherit; text-underline-offset: .22em; }
button { font: inherit; cursor: pointer; }
button, .button { min-height: 44px; line-height: 1.2; }
button:disabled { cursor: wait; opacity: .6; }
button, .button, .text-link, nav a { white-space: nowrap; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 4px; }
.wrap { width: min(100%, 1200px); margin-inline: auto; padding-inline: max(var(--space-lg), env(safe-area-inset-left), env(safe-area-inset-right)); }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); padding-block: var(--space-lg); }
.wordmark { display: inline-flex; align-items: center; min-height: 44px; min-width: 0; text-decoration: none; }
.wordmark img { display: block; width: 160px; max-width: 100%; height: auto; }
.header-nav { display: flex; align-items: center; gap: var(--space-xl); }
.header-nav a { display: inline-flex; align-items: center; gap: var(--space-sm); min-height: 44px; font-size: var(--text-sm); text-decoration: none; }
.header-nav .nav-detail { display: none; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-md); border: var(--rule-width) solid var(--color-ink); border-radius: var(--radius-sm); padding: .875rem var(--space-lg); background: var(--color-ink); color: var(--color-paper); text-decoration: none; font-size: var(--text-sm); font-weight: 550; transition: transform var(--dur-micro) var(--ease-out); }
.button.secondary { color: var(--color-ink); background: var(--color-paper); border-color: var(--color-control); }
.small { font-size: var(--text-sm); }
.intro { display: grid; gap: var(--space-xl); padding-block: var(--space-xl) var(--space-2xl); }
.hero-copy { align-self: center; }
.availability { display: flex; gap: var(--space-sm); align-items: center; font-size: var(--text-xs); font-family: var(--font-mono); color: var(--color-muted); margin-block-end: var(--space-lg); }
.availability > span { width: 7px; height: 7px; border-radius: var(--radius-pill); background: var(--color-accent); flex-shrink: 0; }
h1 > span { display: inline-block; }
.hero-lede { margin-block-start: var(--space-lg); font-size: var(--text-lede); line-height: 1.55; max-width: 30ch; }
.hero-description { margin-block-start: var(--space-md); color: var(--color-muted); max-width: 40ch; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-sm); margin-block-start: var(--space-xl); }
.hero-footnote { margin-block-start: var(--space-lg); font-size: var(--text-xs); color: var(--color-muted); }
.hero-visual { position: relative; min-width: 0; padding: var(--space-lg); border-radius: var(--radius-md); background: var(--color-surface); }
.connection { display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); }
.connection strong { color: var(--color-ink); font-weight: 550; }
.connection > span:nth-child(2) { color: var(--color-accent); }
.device-stage { display: grid; grid-template-columns: minmax(0, .7fr) minmax(0, 1fr); align-items: center; gap: var(--space-md); padding-block: var(--space-lg); }
.signal-flow { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-xl); }
.signal-flow li { position: relative; display: grid; gap: var(--space-xs); min-width: 0; padding-inline-start: var(--space-md); }
.signal-flow li::before { content: ''; position: absolute; left: 0; top: 2px; bottom: 0; width: 2px; background: var(--color-rule); }
.signal-flow li::after { content: ''; position: absolute; left: 0; top: 2px; bottom: 0; width: 2px; background: var(--color-accent); opacity: 0; transform: scaleY(.15); transform-origin: top; }
.signal-index { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); }
.signal-flow strong { font-weight: 550; font-size: var(--text-sm); }
.signal-flow li > span:last-child { color: var(--color-muted); font-size: var(--text-xs); line-height: 1.4; }
.hero-capture { display: grid; gap: var(--space-md); justify-items: center; min-width: 0; }
.hero-capture img { display: block; width: 100%; max-width: 224px; height: auto; border-radius: var(--radius-sm); }
.hero-capture figcaption { font-size: var(--text-xs); color: var(--color-muted); }
.visual-caption { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-xs) var(--space-sm); font-size: var(--text-xs); color: var(--color-muted); }
.visual-caption > span { max-width: 100%; }
.replay-button { display: inline-flex; align-items: center; gap: var(--space-sm); border: 0; padding: 0; color: var(--color-ink); background: none; font-size: var(--text-xs); }
.replay-button > span { font-size: var(--text-lede); }
.platform-strip { padding-block: var(--space-lg); display: grid; gap: var(--space-lg); }
.platform-strip p { color: var(--color-muted); font-size: var(--text-sm); }
.platform-strip ul { display: flex; flex-wrap: wrap; gap: var(--space-md) var(--space-xl); margin: 0; padding: 0; list-style: none; font-size: var(--text-sm); font-weight: 550; }
.demo { display: grid; gap: var(--space-xl); padding-block: var(--space-3xl) var(--space-2xl); }
.demo-copy { display: grid; gap: var(--space-lg); align-content: center; }
.demo blockquote { font-size: var(--text-lede); max-width: 36ch; line-height: 1.55; }
.task-flow { list-style: none; padding: 0; margin: var(--space-md) 0 0; display: grid; gap: var(--space-lg); counter-reset: task; }
.task-flow li { display: grid; grid-template-columns: var(--space-lg) minmax(0, 1fr); gap: var(--space-xs) var(--space-md); counter-increment: task; }
.task-flow li::before { content: counter(task, decimal-leading-zero); grid-row: 1 / 3; font-family: var(--font-mono); color: var(--color-accent); font-size: var(--text-xs); padding-block-start: var(--space-xs); }
.task-flow strong { font-weight: 550; }
.task-flow span { grid-column: 2; color: var(--color-muted); max-width: 44ch; font-size: var(--text-sm); }
.text-link { display: inline-flex; align-items: center; gap: var(--space-sm); width: fit-content; min-height: 44px; font-size: var(--text-sm); font-weight: 550; }
.demo-evidence { padding: var(--space-xl); background: var(--color-surface); border-radius: var(--radius-md); display: grid; align-content: center; gap: var(--space-md); min-width: 0; }
.demo-evidence figure { display: grid; gap: var(--space-lg); }
.demo-evidence img { width: min(100%, 230px); height: auto; justify-self: center; border-radius: var(--radius-sm); }
figcaption { color: var(--color-muted); font-size: var(--text-xs); }
.capabilities { padding-block: var(--space-2xl) var(--space-3xl); }
.capabilities h2 { max-width: 20ch; }
.capabilities dl { margin-block: var(--space-xl) var(--space-lg); }
.capabilities dl > div { display: grid; gap: var(--space-sm); padding-block: var(--space-lg); border-block-start: var(--rule-width) solid var(--color-rule); }
dt { font-size: var(--text-lede); font-weight: 550; letter-spacing: -.025em; }
.capabilities dd { max-width: 50ch; }
.command { font-size: var(--text-xs); font-family: var(--font-mono); color: var(--color-accent); overflow-wrap: anywhere; }
.platform-note { max-width: 75ch; font-size: var(--text-sm); color: var(--color-muted); }
.section-heading { display: grid; gap: var(--space-md); margin-block-end: var(--space-xl); }
.section-heading p { color: var(--color-muted); }
.requirements { background: var(--color-surface); padding: 0 var(--space-lg); border-radius: var(--radius-sm); }
.requirements summary { min-height: 64px; padding-block: var(--space-md); display: flex; gap: var(--space-md); align-items: center; justify-content: space-between; list-style: none; cursor: pointer; font-size: var(--text-sm); font-weight: 550; }
.requirements summary::-webkit-details-marker { display: none; }
.requirements summary > span { font-family: var(--font-mono); font-size: var(--text-lede); }
.requirements[open] summary > span { transform: rotate(45deg); }
.requirements-copy { display: grid; gap: var(--space-md); padding-block-end: var(--space-lg); font-size: var(--text-sm); }
.requirements p { max-width: 85ch; }
.muted { color: var(--color-muted); }
.install-steps { list-style: none; padding: 0; margin: var(--space-2xl) 0 0; display: grid; gap: var(--space-2xl); }
.install-steps > li { display: grid; gap: var(--space-md); min-width: 0; }
.install-steps > li > h3 { margin-block-end: var(--space-sm); }
.code-block { display: grid; gap: var(--space-lg); color: var(--color-on-dark); background: var(--color-dark-surface); padding: var(--space-lg); border-radius: var(--radius-sm); min-width: 0; }
pre { font-family: var(--font-mono); font-size: var(--text-sm); max-width: 100%; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.85; }
code { font-family: var(--font-mono); font-size: .92em; overflow-wrap: anywhere; }
pre code { font-size: inherit; }
.copy-button { width: fit-content; border: var(--rule-width) solid var(--color-control); border-radius: var(--radius-sm); padding: var(--space-sm) var(--space-md); font-size: var(--text-xs); line-height: 1.2; color: var(--color-ink); background: var(--color-paper); min-width: 6rem; transition: transform var(--dur-micro) var(--ease-out); }
.copy-button[data-state='error'] { color: var(--color-error); border-color: var(--color-error); }
.copy-button[data-state='copied'] { color: var(--color-accent); font-weight: 550; }
.supporting { font-size: var(--text-sm); color: var(--color-muted); max-width: 75ch; }
.demo-evidence .supporting { font-size: var(--text-xs); }
.client-tabs { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.client-tabs button { padding: var(--space-sm) var(--space-lg); border: var(--rule-width) solid var(--color-control); border-radius: var(--radius-sm); color: var(--color-ink); background: var(--color-paper); font-size: var(--text-sm); }
.client-tabs button[aria-selected='true'] { color: var(--color-paper); background: var(--color-ink); border-color: var(--color-ink); }
.client-panel { display: grid; gap: var(--space-md); min-width: 0; }
.client-panel[role='tabpanel'] > h4 { display: none; }
.prompt-block { padding: var(--space-lg); background: var(--color-accent-soft); border-radius: var(--radius-sm); display: grid; gap: var(--space-lg); }
.prompt-block p { font-size: var(--text-lede); }
.notes { padding-block: var(--space-3xl); }
.notes-grid { display: grid; gap: var(--space-xl); margin-block-start: var(--space-xl); }
.notes-grid > div { display: grid; gap: var(--space-md); align-content: start; }
.notes-grid p { color: var(--color-muted); font-size: var(--text-sm); }
.site-footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-lg); padding-block: var(--space-xl) max(var(--space-xl), env(safe-area-inset-bottom)); font-size: var(--text-sm); }
.footer-brand { display: grid; gap: var(--space-sm); }
.footer-brand p { color: var(--color-muted); }
.site-footer nav { display: flex; gap: var(--space-lg); flex-wrap: wrap; }
.site-footer nav a { display: inline-flex; align-items: center; min-height: 44px; }
.skip-link { position: fixed; inset-block-start: var(--space-sm); inset-inline-start: var(--space-md); padding: var(--space-md); background: var(--color-ink); color: var(--color-paper); z-index: var(--z-raised); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: clip; clip-path: inset(50%); white-space: nowrap; border: 0; }
@media (min-width: 40rem) {
  .wrap { padding-inline: var(--space-xl); }
  .header-nav .nav-detail { display: inline-flex; }
  .intro { padding-block-start: var(--space-2xl); }
  .hero-visual { padding: var(--space-xl); max-width: 620px; width: 100%; justify-self: center; }
  .device-stage { gap: var(--space-xl); grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); }
  .signal-flow strong { font-size: var(--text-base); }
  .signal-flow li > span:last-child { font-size: var(--text-sm); }
  .signal-flow li { padding-inline-start: var(--space-lg); }
  .signal-flow { gap: var(--space-2xl); }
  .platform-strip { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
  .code-block { grid-template-columns: minmax(0, 1fr) auto; align-items: start; }
  .capabilities dl > div { grid-template-columns: 8rem minmax(0, 1fr); gap: var(--space-lg); }
  .capabilities .command { grid-column: 2; }
  .notes-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 60rem) {
  .intro { grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr); align-items: center; gap: var(--space-xl); padding-block: var(--space-xl) var(--space-2xl); }
  .hero-visual { padding: var(--space-lg); }
  .hero-lede { margin-block-start: var(--space-xl); }
  .device-stage { gap: var(--space-lg); }
  .demo { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-3xl); padding-block-start: var(--space-4xl); }
  .demo-copy { grid-column: 2; grid-row: 1; }
  .demo-evidence { grid-column: 1; grid-row: 1; }
  .capabilities dl > div { grid-template-columns: 10rem minmax(0, 1fr) minmax(0, .8fr); }
  .capabilities .command { grid-column: auto; }
  .install-steps > li { grid-template-columns: 12rem minmax(0, 1fr); column-gap: var(--space-xl); }
  .install-steps > li > h3 { grid-column: 1; grid-row: 1; font-size: var(--text-lede); padding-block-start: var(--space-xs); }
  .install-steps > li > :not(h3) { grid-column: 2; }
}
@media (max-width: 39.99rem) {
  .site-header { padding-block: var(--space-md); }
  .intro { padding-block-start: var(--space-lg); }
  .availability { margin-block-end: var(--space-md); }
  .hero-description, .hero-footnote { display: none; }
  .hero-actions { margin-block-start: var(--space-lg); }
}
@media (max-width: 23rem) {
  .wrap { padding-inline: max(var(--space-md), env(safe-area-inset-left), env(safe-area-inset-right)); }
  .wordmark img { width: 132px; }
  .site-header .button { padding-inline: var(--space-md); }
  .hero-visual { padding: var(--space-md); }
  .connection { font-size: .625rem; }
  .device-stage { gap: var(--space-sm); }
  .signal-flow { gap: var(--space-lg); }
  .signal-flow li { padding-inline-start: var(--space-sm); }
  .hero-capture figcaption { font-size: .625rem; }
  .hero-actions .button { padding-inline: var(--space-md); }
  .demo-evidence { padding: var(--space-lg); }
}
@media (hover: hover) and (pointer: fine) {
  .button:hover { transform: translateY(-2px); }
  .copy-button:hover { background: var(--color-raised); }
  .client-tabs button:not([aria-selected='true']):hover { background: var(--color-surface); }
  .replay-button:hover, .header-nav .nav-detail:hover { color: var(--color-accent); }
  a:hover { text-decoration-thickness: 2px; }
  .button:active, button:active { transform: translateY(1px); }
}
@media (prefers-reduced-motion: no-preference) {
  .hero-copy { animation: hero-enter var(--dur-enter) var(--ease-out) both; }
  .hero-visual { animation: hero-enter var(--dur-enter) var(--ease-out) 120ms both; }
  .is-playing .signal-flow li::after { animation: signal-pass var(--dur-step) var(--ease-in-out) both; }
  .is-playing .signal-flow li:nth-child(2)::after { animation-delay: var(--delay-step); }
  .is-playing .signal-flow li:nth-child(3)::after { animation-delay: calc(var(--delay-step) * 2); }
  .is-playing .signal-flow li:last-child::after { animation-name: signal-finish; }
}
@keyframes hero-enter { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes signal-pass { 0% { opacity: 0; transform: scaleY(.15); } 35%, 70% { opacity: 1; transform: scaleY(1); } 100% { opacity: 0; transform: scaleY(1); } }
@keyframes signal-finish { 0% { opacity: 0; transform: scaleY(.15); } 35%, 100% { opacity: 1; transform: scaleY(1); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .signal-flow li:last-child::after { opacity: 1; transform: none; }
  .replay-button { display: none; }
  .button:hover, .button:active, button:active { transform: none; }
}

/* Language navigation is a real link to the equivalent static page. */
.language-switch { display: inline-flex; align-items: center; justify-content: center; min-width: 48px; min-height: 44px; padding: var(--space-sm); border: var(--rule-width) solid var(--color-control); border-radius: var(--radius-sm); text-decoration: none; font-size: var(--text-sm); white-space: nowrap; color: var(--color-ink); background: var(--color-paper); }
html[lang='zh-CN'] h1 { letter-spacing: -.035em; line-height: 1.18; }
html[lang='zh-CN'] h2, html[lang='zh-CN'] h3 { letter-spacing: -.02em; line-height: 1.35; }
@media (max-width: 47.99rem) { .header-nav .nav-detail { display: none; } .header-nav { gap: var(--space-md); } }
@media (max-width: 39.99rem) { .site-header .header-nav > .button { display: none; } .header-nav { gap: var(--space-md); } }
@media (hover: hover) and (pointer: fine) { .language-switch:hover { background: var(--color-surface); } }