:root {
  color-scheme: light dark;
  --bg: #f3f3f0;
  --surface: #fbfbf9;
  --ink: #1f2124;
  --muted: #5f6368;
  --line: #d6d7d3;
  --accent: #2b4a6f;
  --rule: 2px;
  font-family:
    Inter,
    "SF Pro Display",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151618;
    --surface: #1b1d1f;
    --ink: #e7e7e3;
    --muted: #a0a4a8;
    --line: #303336;
    --accent: #9dbbe0;
  }
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 28px;
}
body {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}
h1,
h2,
h3,
p,
figure,
dl,
dd,
ul {
  margin: 0;
}
h1,
h2,
h3 {
  font-weight: 600;
  text-wrap: balance;
}
h2 {
  font-size: 32px;
  line-height: 1.4;
  letter-spacing: -0.03em;
}
a {
  color: inherit;
  text-underline-offset: 4px;
}
a:hover {
  color: var(--accent);
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}
.wrap {
  width: min(1120px, calc(100% - 80px));
  margin-inline: auto;
}
.skip-link {
  position: absolute;
  top: -80px;
  left: 20px;
  z-index: 10;
  background: var(--surface);
  padding: 12px;
}
.skip-link:focus {
  top: 12px;
}

/* Header */
.site-header {
  height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: var(--rule) solid var(--ink);
}
.wordmark {
  font-size: 24px;
  font-weight: 650;
  letter-spacing: -0.04em;
  text-decoration: none;
}
.brand-period {
  color: var(--accent);
}
nav {
  display: flex;
  gap: 28px;
  align-items: center;
}
nav a {
  font-size: 13px;
  padding-block: 12px;
  text-decoration: none;
}
nav .source-link {
  border-left: 1px solid var(--line);
  padding-left: 28px;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding-block: 64px 72px;
}
.eyebrow {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.17em;
  color: var(--muted);
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(40px, 4.55vw, 58px);
  line-height: 1.25;
  letter-spacing: -0.035em;
}
.hero-description {
  font-size: 20px;
  margin-top: 24px;
}
.actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 32px;
}
/* Controls share the firmware’s square corners and solid selected states. */
.button {
  min-height: 46px;
  gap: 24px;
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  border: var(--rule) solid var(--ink);
  background: var(--ink);
  color: var(--bg);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition:
    background 0.15s,
    color 0.15s;
}
.button:disabled {
  background: transparent;
  color: var(--muted);
  border-color: var(--line);
  border-style: dashed;
  font: inherit;
  font-size: 14px;
  cursor: not-allowed;
}
.pending {
  font-size: 13px;
  color: var(--muted);
}
.button:hover:not(:disabled) {
  background: transparent;
  color: var(--ink);
}
.button:active {
  transform: translateY(1px);
}
.text-link {
  font-size: 13px;
}
.hero-footnote {
  max-width: 34em;
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}
.screen {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid #1f2124;
  background: #fff;
}
.hero-figure {
  justify-self: end;
  width: min(100%, 440px);
}
.hero-screens {
  position: relative;
  padding-bottom: 14%;
}
.hero-screens .back {
  width: 62%;
  opacity: 0.85;
}
.hero-screens .front {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 62%;
  box-shadow: -18px 22px 40px -24px #1f212466;
}
figcaption {
  margin-top: 14px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* Shared section rhythm */
.screens,
.hardware {
  padding-block: 72px 80px;
}
.section-lead {
  max-width: 44em;
  margin-top: 14px;
  font-size: 14px;
  color: var(--muted);
}

/* Screens */
.screens {
  border-top: 1px solid var(--line);
}
.screens-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 80px;
  align-items: start;
  margin-top: 44px;
}
.screen-index {
  border-top: var(--rule) solid var(--ink);
}
.screen-index button {
  display: grid;
  grid-template-columns: 7em 1fr;
  gap: 20px;
  align-items: baseline;
  width: 100%;
  padding: 18px 16px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.screen-index strong {
  font-size: 20px;
  font-weight: 600;
}
.screen-index span {
  font-size: 13px;
  color: var(--muted);
}
.screen-index button:hover {
  background: var(--surface);
}
.screen-index button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
  border-bottom-color: var(--ink);
}
.screen-index button[aria-pressed="true"] span {
  color: inherit;
  opacity: 0.75;
}
.screen-stage {
  position: sticky;
  top: 28px;
}

/* Features */
.features {
  padding-block: 72px 80px;
  background: var(--surface);
  border-block: 1px solid var(--line);
}
.feature-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 44px 72px;
  margin-top: 44px;
}
.feature-grid article {
  border-top: var(--rule) solid var(--ink);
  padding-top: 18px;
}
.feature-grid h3 {
  font-size: 22px;
}
.feature-grid article > p,
.limits ul {
  list-style: none;
  padding: 0;
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}
.limits li {
  padding-block: 5px;
}
.keys {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 20px;
  border: 1px solid var(--line);
}
.keys div {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 22px;
}
.keys div + div {
  border-left: 1px solid var(--line);
}
kbd {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 18px;
  font-weight: 600;
}
.keys-note {
  max-width: 52em;
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
}
.limits {
  margin-top: 44px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  font-size: 14px;
}
.limits summary {
  cursor: pointer;
  font-weight: 600;
}

/* Hardware */
.hardware {
  border-top: 1px solid var(--line);
}
.specs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px 48px;
  margin-top: 44px;
}
.specs dt {
  font-size: 12px;
  color: var(--muted);
}
.specs dd {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.specs .spec-detail {
  margin-top: 4px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
}

/* Install */
.install {
  padding-block: 72px 80px;
  background: var(--surface);
  border-block: 1px solid var(--line);
}
.install-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 72px;
  align-items: start;
}
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  border-top: var(--rule) solid var(--ink);
}
.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 2.5em 8em 1fr;
  align-items: baseline;
  padding-block: 18px;
  border-bottom: 1px solid var(--line);
}
.steps li::before {
  content: counter(step);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color: var(--muted);
}
.steps strong {
  font-size: 18px;
  font-weight: 600;
}
.steps span {
  font-size: 14px;
  color: var(--muted);
}

.resource-block {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.resources .actions {
  flex-wrap: wrap;
}

/* Download resources */
.resources {
  padding-block: 72px 80px;
}
.resource-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}
.resource-heading .button {
  flex-shrink: 0;
}
.lockscreen-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
}
.lockscreen-preview, .lockscreen-preview img {
  display: block;
  width: 100%;
}
.lockscreen-preview img {
  height: auto;
  border: 1px solid var(--line);
}
.lockscreen-grid figcaption {
  letter-spacing: 0;
  font-size: 12px;
}
.lockscreen-grid strong {
  display: block;
  color: var(--ink);
  font-weight: 500;
}
.lockscreen-grid figcaption a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: 12px;
}
.resource-instructions {
  margin-top: 24px;
  font-size: 14px;
}
.resource-instructions summary {
  cursor: pointer;
  font-weight: 600;
}
.resource-instructions p {
  max-width: 60em;
  color: var(--muted);
  margin-top: 12px;
}

/* Footer */
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-block: 28px 44px;
  border-top: var(--rule) solid var(--ink);
  font-size: 12px;
  color: var(--muted);
}
.site-footer nav {
  flex-wrap: wrap;
  gap: 20px;
}

/* Product overview */
.intro-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
  padding-block: 28px 36px;
  border-top: var(--rule) solid var(--ink);
}
.intro-strip span, .intro-strip strong {
  display: block;
}
.intro-strip span {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}
.intro-strip strong {
  font-size: 20px;
  font-weight: 500;
}
.feature-number {
  display: block;
  font: 12px ui-monospace, monospace;
  color: var(--muted);
  margin-bottom: 16px;
}
.feature-grid article > p {
  max-width: 34em;
  font-size: 15px;
}
.feature-grid article > .feature-note {
  font-size: 13px;
  margin-top: 16px;
}
.screen-description {
  display: none;
}
.reading-controls {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.reading-controls > p:first-child {
  font-size: 18px;
  font-weight: 500;
}
.hardware-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}
.hardware-heading .section-lead {
  margin-top: 20px;
}
.pending {
  margin-top: 16px;
}
.footer-brand {
  display: block;
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}
code {
  font-family: ui-monospace, monospace;
  font-size: 0.95em;
}

@media (max-width: 860px) {
  .wrap {
    width: calc(100% - 40px);
  }
  .site-header a:not(.ext, .wordmark, .resource-nav) {
    display: none;
  }
  nav .source-link {
    border: 0;
    padding-inline: 0;
  }
  .hero,
  .screens-layout,
  .feature-grid,
  .install-layout {
    grid-template-columns: 1fr;
  }
  .resource-heading {
    align-items: start;
    flex-direction: column;
  }
  .lockscreen-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 16px;
  }
  .hero {
    gap: 48px;
    padding-block: 48px 64px;
  }
  .hero h1 {
    font-size: 40px;
  }
  .hero-figure {
    justify-self: center;
  }
  h2 {
    font-size: 26px;
  }
  .screens-layout,
  .install-layout {
    gap: 24px;
  }
  .screen-index {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    border: 0;
  }
  .screen-index button {
    display: block;
    min-height: 46px;
    padding: 10px 4px;
    border: 1px solid var(--line);
    text-align: center;
  }
  .screen-index strong {
    font-size: 14px;
  }
  .screen-index button span {
    display: none;
  }
  .screen-stage {
    position: static;
    width: min(100%, 320px);
    margin-inline: auto;
  }
  .keys div {
    flex-direction: column;
    gap: 2px;
    padding: 12px 8px;
    font-size: 12px;
  }
  .specs {
    grid-template-columns: 1fr 1fr;
    gap: 28px 24px;
  }
  .steps li {
    grid-template-columns: 2.5em 1fr;
  }
  .steps span {
    grid-column: 2;
  }
  .site-footer {
    flex-direction: column;
  }
  .intro-strip {
    gap: 16px;
  }
  .intro-strip strong {
    font-size: 15px;
  }
  .intro-strip span {
    font-size: 11px;
  }
  .hardware-heading {
    display: block;
  }
  .screen-description {
    display: block;
    min-height: 5.25em;
    margin-bottom: 16px;
    color: var(--muted);
    font-size: 14px;
  }
  .reading-controls {
    margin-top: 40px;
  }
  .feature-grid {
    gap: 32px;
    margin-top: 32px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

@media (max-width: 400px) {
  .hero h1 {
    font-size: 36px;
  }
  .hero-description {
    font-size: 17px;
  }
  h2 {
    font-size: 24px;
  }
  .actions {
    gap: 18px;
    flex-wrap: wrap;
  }
  .intro-strip strong {
    font-size: 13px;
  }
  .intro-strip span {
    font-size: 10px;
  }
}