:root {
  color-scheme: light dark;
  --page: #f4f3ef;
  --surface: #ffffff;
  --surface-soft: #ebeae5;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --separator: rgb(60 60 67 / 18%);
  --brand: #304d47;
  --signal: #ff6b4a;
  --focus: #0a84ff;
  --mark-bg: #ffffff;
  --page-width: min(1120px, calc(100% - 48px));
  --reading-width: 720px;
  --shadow: 0 1px 2px rgb(0 0 0 / 4%), 0 18px 56px rgb(0 0 0 / 7%);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }

html {
  min-width: 320px;
  background: var(--page);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--page);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

::selection {
  color: var(--text);
  background: color-mix(in srgb, var(--signal) 30%, transparent);
}

a {
  color: var(--brand);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover { text-decoration-thickness: 2px; }

a:focus-visible,
summary:focus-visible {
  border-radius: 7px;
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: max(10px, env(safe-area-inset-top));
  left: max(10px, env(safe-area-inset-left));
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--surface);
  background: var(--text);
  font-size: 15px;
  font-weight: 650;
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.site-header,
.site-footer,
main {
  width: var(--page-width);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding-top: env(safe-area-inset-top);
}

.identity {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--text);
  font-size: 18px;
  font-weight: 680;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.mark {
  width: 78px;
  height: 34px;
  object-fit: contain;
}

.site-nav,
.site-footer nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a,
.site-footer nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  border-radius: 12px;
  color: var(--secondary);
  font-size: 15px;
  font-weight: 560;
  text-decoration: none;
}

.site-nav a:hover,
.site-footer nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
  background: var(--surface-soft);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p { margin-top: 0; }

h1 {
  max-width: 13ch;
  margin-bottom: 24px;
  font-size: clamp(44px, 6vw, 68px);
  font-weight: 730;
  letter-spacing: -0.05em;
  line-height: 1;
  text-wrap: balance;
}

h2 {
  max-width: 20ch;
  margin-bottom: 16px;
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 710;
  letter-spacing: -0.04em;
  line-height: 1.08;
  text-wrap: balance;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
  font-weight: 680;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

p { margin-bottom: 0; }
p + p { margin-top: 14px; }

.lede {
  max-width: 38ch;
  margin-bottom: 28px;
  color: var(--secondary);
  font-size: clamp(19px, 2vw, 23px);
  letter-spacing: -0.025em;
  line-height: 1.4;
}

.home-shell {
  width: min(var(--reading-width), calc(100% - 48px));
  margin-inline: auto;
  padding: clamp(72px, 10vw, 118px) 0 120px;
}

.home-intro,
.home-section {
  max-width: 68ch;
}

.home-intro { padding-bottom: clamp(68px, 9vw, 100px); }

.home-intro h1 { margin-bottom: 30px; }

.release-callout {
  margin-top: 32px;
}

.release-callout h2 {
  max-width: none;
  margin-bottom: 8px;
  font-size: 20px;
  letter-spacing: -0.025em;
  line-height: 1.3;
}

.home-intro .release-callout p {
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.5;
}

.release-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  max-width: 100%;
  padding: 12px 18px;
  margin-top: 16px;
  border: 0;
  border-radius: 12px;
  color: var(--page);
  background: var(--text);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  transition: transform 140ms var(--ease-out), opacity 140ms var(--ease-out);
}

.release-cta img { flex: 0 0 24px; }
.release-cta:active { transform: scale(0.98); opacity: 0.85; }
@media (hover: hover) and (pointer: fine) {
  .release-cta:hover { opacity: 0.9; }
}
@media (prefers-reduced-motion: reduce) {
  .release-cta { transition: none; }
  .release-cta:active { transform: none; }
}
#showcase-title { scroll-margin-top: 24px; }

.home-intro p,
.home-section > p,
.faq article p {
  color: var(--secondary);
  font-size: clamp(18px, 2vw, 21px);
  letter-spacing: -0.015em;
  line-height: 1.55;
}

.home-lede {
  color: var(--text) !important;
  font-size: clamp(23px, 2.8vw, 29px) !important;
  font-weight: 560;
  letter-spacing: -0.028em !important;
  line-height: 1.38 !important;
}

.home-section {
  padding: clamp(58px, 8vw, 82px) 0;
  border-top: 1px solid var(--separator);
}

.home-section h2 { max-width: none; }

.faq article {
  padding: 30px 0;
  border-top: 1px solid var(--separator);
}

.faq h2 + article { margin-top: 34px; }
.faq article h3 { max-width: 34ch; margin-bottom: 10px; font-size: 20px; }
.faq article p { max-width: 64ch; font-size: 17px; }
.contact a { font-weight: 650; }

.showcase > p { max-width: 44ch; }

.photo-stack {
  position: relative;
  min-inline-size: 0;
  margin-top: 44px;
  padding: 0;
  border: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.stack-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.stack-stage {
  position: relative;
  min-height: 690px;
  overflow: clip;
  isolation: isolate;
}

.stack-shot {
  position: absolute;
  top: 0;
  left: 50%;
  width: min(306px, 58vw);
  margin: 0;
  opacity: 0.48;
  transform: translateX(-50%) scale(0.86);
  transform-origin: 50% 90%;
  transition: transform 320ms var(--ease-out), opacity 220ms ease;
  will-change: transform;
}

.shot-reader { z-index: 1; transform: translateX(-80%) rotate(-3.2deg) scale(0.86); }
.shot-summary { z-index: 3; }
.shot-audio { z-index: 2; transform: translateX(-20%) rotate(3.2deg) scale(0.86); }

#screen-reader:checked ~ .stack-stage .shot-reader,
#screen-summary:checked ~ .stack-stage .shot-summary,
#screen-audio:checked ~ .stack-stage .shot-audio {
  z-index: 4;
  opacity: 1;
  transform: translateX(-50%) rotate(0) scale(1);
}

#screen-reader:checked ~ .stack-stage .shot-summary,
#screen-summary:checked ~ .stack-stage .shot-audio,
#screen-audio:checked ~ .stack-stage .shot-reader {
  z-index: 2;
  transform: translateX(-18%) rotate(3.2deg) scale(0.86);
}

#screen-reader:checked ~ .stack-stage .shot-audio,
#screen-summary:checked ~ .stack-stage .shot-reader,
#screen-audio:checked ~ .stack-stage .shot-summary {
  z-index: 1;
  transform: translateX(-82%) rotate(-3.2deg) scale(0.86);
}

.iphone-frame {
  position: relative;
  padding: 6px;
  border: 1px solid #77777c;
  border-radius: clamp(38px, 8vw, 51px);
  background: linear-gradient(115deg, #77777c 0%, #202023 8%, #09090a 46%, #303034 90%, #7a7a7f 100%);
  box-shadow:
    inset 0 0 0 1px rgb(255 255 255 / 18%),
    0 4px 10px rgb(0 0 0 / 18%),
    0 30px 70px rgb(0 0 0 / 24%);
}

.iphone-frame::before {
  position: absolute;
  z-index: 3;
  inset: 5px;
  border: 1px solid rgb(255 255 255 / 9%);
  border-radius: clamp(33px, 7vw, 46px);
  pointer-events: none;
  content: "";
}

.iphone-frame::after {
  position: absolute;
  z-index: -1;
  inset: 12% 7% -2%;
  border-radius: 30%;
  background: rgb(0 0 0 / 52%);
  filter: blur(26px);
  content: "";
}

.device-screen {
  display: block;
  overflow: hidden;
  border: 1px solid #050505;
  border-radius: clamp(32px, 7vw, 45px);
  background: #000000;
}

.device-screen img {
  display: block;
  width: 100%;
  height: auto;
  background: #000000;
}

.device-island {
  position: absolute;
  z-index: 4;
  top: clamp(13px, 2.7vw, 17px);
  left: 50%;
  width: 30.5%;
  height: clamp(18px, 3.8vw, 23px);
  border: 1px solid #090909;
  border-radius: 999px;
  background: #000000;
  box-shadow: inset 0 1px 1px rgb(255 255 255 / 5%);
  transform: translateX(-50%);
}

.device-button {
  position: absolute;
  z-index: -1;
  width: 3px;
  border: 1px solid #444448;
  background: linear-gradient(#66666b, #262629 32%, #18181a 68%, #5b5b60);
}

.device-action {
  top: 17%;
  left: -4px;
  height: 5.2%;
  border-radius: 3px 0 0 3px;
}

.device-volume-up,
.device-volume-down {
  left: -4px;
  height: 8.2%;
  border-radius: 3px 0 0 3px;
}

.device-volume-up { top: 25%; }
.device-volume-down { top: 34.5%; }

.device-side {
  top: 27.5%;
  right: -4px;
  height: 14%;
  border-radius: 0 3px 3px 0;
}

.stack-advance {
  position: absolute;
  z-index: 6;
  top: 0;
  left: 50%;
  display: none;
  width: min(306px, 58vw);
  aspect-ratio: 660 / 1458;
  border-radius: clamp(38px, 8vw, 51px);
  cursor: pointer;
  transform: translateX(-50%);
}

#screen-reader:checked ~ .stack-stage .advance-reader,
#screen-summary:checked ~ .stack-stage .advance-summary,
#screen-audio:checked ~ .stack-stage .advance-audio { display: block; }

.stack-controls {
  display: flex;
  justify-content: center;
  gap: 2px;
  margin-top: 12px;
}

.stack-controls label {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  min-height: 44px;
  padding: 0;
  border-radius: 50%;
  cursor: pointer;
}

.stack-controls label::after {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--secondary);
  content: "";
  transition: transform 160ms var(--ease-out), background-color 160ms ease;
}

.stack-controls label:hover { background: var(--surface-soft); }
#screen-reader:focus-visible ~ .stack-controls label[for="screen-reader"],
#screen-summary:focus-visible ~ .stack-controls label[for="screen-summary"],
#screen-audio:focus-visible ~ .stack-controls label[for="screen-audio"] { outline: 3px solid var(--focus); outline-offset: 3px; }
#screen-reader:checked ~ .stack-controls label[for="screen-reader"],
#screen-summary:checked ~ .stack-controls label[for="screen-summary"],
#screen-audio:checked ~ .stack-controls label[for="screen-audio"] { background: transparent; }

#screen-reader:checked ~ .stack-controls label[for="screen-reader"]::after,
#screen-summary:checked ~ .stack-controls label[for="screen-summary"]::after,
#screen-audio:checked ~ .stack-controls label[for="screen-audio"]::after {
  background: var(--text);
  transform: scale(1.45);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 0 max(34px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--separator);
}

.site-footer .mark { width: 69px; height: 30px; }

.page-shell {
  width: min(var(--reading-width), calc(100% - 48px));
  margin-inline: auto;
  padding: 70px 0 120px;
}

.page-shell h1 { max-width: 11ch; font-size: clamp(48px, 7vw, 76px); }
.page-shell .lede { max-width: 31ch; }
.updated { margin-top: 18px; color: var(--secondary); font-size: 14px; }

.fact-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  margin: 48px 0 64px;
  border: 1px solid var(--separator);
  border-radius: 20px;
  background: var(--separator);
  box-shadow: var(--shadow);
}

.fact { min-height: 128px; padding: 22px; background: var(--surface); }
.fact strong, .fact span { display: block; }
.fact strong { font-size: 16px; }
.fact span { margin-top: 6px; color: var(--secondary); font-size: 14px; line-height: 1.42; }
.document { margin-top: 58px; }
.document section { padding: 42px 0; border-top: 1px solid var(--separator); }
.document section:first-child { border-top: 0; }

.document h2 {
  max-width: none;
  margin-bottom: 14px;
  font-size: 27px;
  letter-spacing: -0.035em;
}

.document h3 { margin-top: 28px; }
.document p, .document li { color: var(--secondary); }
.document p strong, .document li strong { color: var(--text); }
ul { margin: 14px 0 0; padding-left: 1.25em; }
li + li { margin-top: 9px; }
li::marker { color: var(--signal); }

.contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 48px 0 58px;
  padding: 24px;
  border: 1px solid color-mix(in srgb, var(--brand) 30%, transparent);
  border-radius: 18px;
  background: color-mix(in srgb, var(--brand) 7%, var(--surface));
}

.contact-card h2 { max-width: none; margin-bottom: 4px; font-size: 22px; }
.contact-card p { color: var(--secondary); font-size: 15px; }

.contact-card a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  flex: 0 0 auto;
  font-weight: 650;
}

.task-list { border-top: 1px solid var(--separator); }
details { border-bottom: 1px solid var(--separator); }

summary {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 72px;
  padding: 18px 46px 18px 0;
  cursor: pointer;
  font-size: 18px;
  font-weight: 650;
  list-style: none;
}

summary::-webkit-details-marker { display: none; }

summary::after {
  position: absolute;
  right: 4px;
  color: var(--brand);
  content: "+";
  font-size: 28px;
  font-weight: 400;
  transition: transform 180ms var(--ease-out);
}

details[open] summary::after { transform: rotate(45deg); }
details > div { max-width: 64ch; padding: 0 46px 24px 0; color: var(--secondary); }

.legal-summary {
  margin: 48px 0 18px;
  padding: 22px 24px;
  border: 1px solid var(--separator);
  border-radius: 16px;
  color: var(--secondary);
  background: var(--surface);
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0b0c0b;
    --surface: #1c1c1e;
    --surface-soft: #2c2c2e;
    --text: #f5f5f7;
    --secondary: #aeaeb2;
    --separator: rgb(84 84 88 / 65%);
    --brand: #8fc7bc;
    --signal: #ff795b;
    --focus: #409cff;
    --mark-bg: #2c2c2e;
    --shadow: 0 1px 2px rgb(0 0 0 / 35%), 0 20px 60px rgb(0 0 0 / 28%);
  }

}

@media (max-width: 760px) {
  :root { --page-width: min(100% - 36px, 1120px); }
  .fact-strip { grid-template-columns: 1fr; }
  .stack-stage { min-height: 690px; }
  .contact-card { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 520px) {
  :root { --page-width: min(100% - 28px, 1120px); }
  .site-header { align-items: flex-start; padding-top: max(12px, env(safe-area-inset-top)); }

  .identity span {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .site-nav { gap: 0; }
  .site-nav a { padding-inline: 9px; font-size: 14px; }
  h1 { font-size: clamp(42px, 13vw, 58px); }
  .home-shell { width: min(100% - 28px, var(--reading-width)); padding-top: 52px; }
  .stack-stage { min-height: 610px; }
  .stack-shot,
  .stack-advance { width: min(270px, 66vw); }
  .page-shell { width: min(100% - 28px, var(--reading-width)); padding-top: 52px; }
  .site-footer { align-items: flex-start; flex-direction: column; }
  .site-footer nav { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  :root { --secondary: #47474b; --separator: #808086; }
}

@media (prefers-contrast: more) and (prefers-color-scheme: dark) {
  :root { --secondary: #d1d1d6; --separator: #8e8e93; }
}

@media print {
  :root {
    --page: #ffffff;
    --surface: #ffffff;
    --text: #000000;
    --secondary: #3a3a3c;
    --separator: #d1d1d6;
    --brand: #000000;
    --shadow: none;
  }

  .site-nav, .site-footer { display: none; }
  .page-shell { width: 100%; padding: 0; }
  .fact-strip, .legal-summary { box-shadow: none; }
}