@font-face {
  font-family: "LXGW WenKai Web";
  src: url("../assets/fonts/lxgw-wenkai-subset.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "Vellink Ximai Web";
  src: url("../assets/fonts/ximai-xihuan-subset.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "Caveat Web";
  src: url("../assets/fonts/caveat-regular-subset.woff2") format("woff2");
  font-display: swap;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-width: 20rem;
  overflow-x: clip;
  color: var(--color-ink);
  background: var(--color-paper);
  scroll-behavior: smooth;
}

body {
  min-width: 20rem;
  margin: 0;
  overflow-x: clip;
  background:
    linear-gradient(90deg, color-mix(in oklch, var(--color-rule-2) 24%, transparent) var(--rule-thin), transparent var(--rule-thin)),
    var(--color-paper);
  background-size: 0.35rem 100%, auto;
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.65;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(118deg, color-mix(in oklch, var(--color-paper-2) 46%, transparent), transparent 42%, color-mix(in oklch, var(--color-sage) 4%, transparent));
}

.paper-grain {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  opacity: 0.14;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.76' numOctaves='3' stitchTiles='stitchTiles'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.14'/%3E%3C/svg%3E");
}

.folio-nav,
main,
footer {
  position: relative;
  z-index: 1;
  width: min(var(--page-max), calc(100% - (var(--page-gutter) * 2)));
  margin-inline: auto;
}

.folio-nav {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.wordmark,
.folio-nav-actions,
.hero-actions,
.release-facts,
footer,
footer div {
  display: flex;
  align-items: center;
}

.wordmark {
  gap: var(--space-3);
  color: inherit;
  font-size: var(--text-md);
  text-decoration: none;
}

.wordmark-seal {
  width: 2rem;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: var(--color-accent-ink);
  background: var(--color-accent);
  font-family: var(--font-display-en);
  font-size: 1.3rem;
  line-height: 1;
}

.folio-nav-actions {
  gap: var(--space-4);
}

.release-stamp,
.eyebrow,
.section-number,
.identity-number,
.step-index,
.feature-grid article > span {
  color: var(--color-muted);
  font-family: var(--font-display-en);
  letter-spacing: 0.08em;
}

.language-switch,
.checksum-value button {
  border: 0;
  border-bottom: var(--rule-thin) solid currentColor;
  padding: var(--space-2) 0;
  color: var(--color-ink);
  background: transparent;
  font: inherit;
  cursor: pointer;
}

[data-zh] {
  display: none;
}

html[data-language="zh"] [data-en] {
  display: none !important;
}

html[data-language="zh"] [data-zh],
html[data-language="en"] [data-en] {
  display: inline;
}

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

h1,
h2,
h3 {
  margin-bottom: 0;
  font-weight: 400;
  line-height: 1.08;
  text-wrap: balance;
}

html[data-language="zh"] h1,
html[data-language="zh"] h2 {
  font-family: var(--font-display-zh);
}

html[data-language="en"] h1,
html[data-language="en"] h2 {
  font-family: var(--font-display-en);
}

.hero {
  min-height: min(49rem, calc(100svh - 5rem));
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(17rem, 0.65fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 8rem);
  padding-block: clamp(4rem, 10vw, 8rem);
}

.hero-copy {
  max-width: 58rem;
}

.eyebrow {
  margin-bottom: var(--space-6);
  color: var(--color-accent);
}

h1 {
  max-width: 13ch;
  font-size: clamp(3.7rem, 8.4vw, 8.8rem);
}

.hero-lede {
  max-width: 48rem;
  margin: var(--space-8) 0 0;
  color: var(--color-ink-2);
  font-size: var(--text-md);
}

.hero-actions {
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-top: var(--space-10);
}

.primary-action,
.text-action,
.inline-link {
  color: inherit;
}

.primary-action,
.text-action {
  text-decoration: none;
}

.inline-link {
  text-decoration-thickness: var(--rule-thin);
  text-underline-offset: 0.18em;
}

.primary-action {
  min-height: 3.4rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-3) var(--space-6);
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border: var(--rule-strong) solid var(--color-accent);
  transition: transform var(--dur-base) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.text-action {
  padding-block: var(--space-2);
  border-bottom: var(--rule-thin) solid var(--color-ink);
}

.release-facts {
  flex-wrap: wrap;
  gap: var(--space-8);
  margin: var(--space-10) 0 0;
}

.release-facts div {
  min-width: 7rem;
}

.release-facts dt {
  color: var(--color-muted);
  font-size: var(--text-xs);
}

.release-facts dd {
  margin: 0.2rem 0 0;
}

.identity-card {
  position: relative;
  padding: clamp(2rem, 5vw, 4rem);
  background: color-mix(in oklch, var(--color-paper-2) 75%, transparent);
  border: var(--rule-thin) solid var(--color-rule);
  box-shadow: 1.4rem 1.4rem 0 color-mix(in oklch, var(--color-rule-2) 48%, transparent);
  transform: rotate(1.5deg);
}

.identity-card p {
  margin-bottom: var(--space-3);
}

.identity-number {
  display: block;
  margin-bottom: var(--space-12);
  font-size: var(--text-xl);
}

.identity-line {
  width: 100%;
  height: var(--rule-thin);
  margin: var(--space-10) 0 var(--space-5);
  background: var(--color-rule);
}

.notice,
.continuity,
.checksum-card {
  display: grid;
  grid-template-columns: minmax(8rem, 0.35fr) minmax(0, 1fr);
  gap: clamp(2rem, 7vw, 7rem);
  padding-block: clamp(3rem, 7vw, 6rem);
  border-top: var(--rule-thin) solid var(--color-rule);
}

.notice {
  color: var(--color-accent-ink);
  background: var(--color-ink);
  width: calc(100% + (var(--page-gutter) * 2));
  margin-left: calc(var(--page-gutter) * -1);
  padding-inline: var(--page-gutter);
}

.notice .section-number {
  color: color-mix(in oklch, var(--color-accent-ink) 60%, transparent);
}

.notice h2,
.section-heading h2,
.continuity h2,
.checksum-card h2 {
  max-width: 18ch;
  font-size: var(--text-section);
}

.notice p:last-child,
.continuity-copy > p:last-child,
.storekit-note {
  max-width: 54rem;
  margin: var(--space-6) 0 0;
}

.install,
.features {
  padding-block: clamp(5rem, 10vw, 10rem);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(8rem, 0.35fr) minmax(0, 1fr);
  gap: clamp(2rem, 7vw, 7rem);
  margin-bottom: clamp(3rem, 7vw, 6rem);
}

.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--rule-thin) solid var(--color-rule);
}

.step-list li {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: var(--space-6);
  padding: var(--space-8) 0;
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.step-list h3,
.feature-grid h3 {
  font-size: var(--text-md);
}

.step-list p,
.feature-grid p {
  max-width: 52rem;
  margin: var(--space-3) 0 0;
  color: var(--color-ink-2);
}

.continuity {
  align-items: start;
}

.continuity-list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-md);
}

.continuity-list li {
  padding: var(--space-4) 0;
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-6);
}

.feature-grid article {
  min-height: 17rem;
  padding: var(--space-6);
  background: color-mix(in oklch, var(--color-paper-2) 70%, transparent);
  border-top: var(--rule-strong) solid var(--color-ink);
}

.feature-grid article > span {
  display: block;
  margin-bottom: var(--space-16);
}

.storekit-note {
  padding-left: var(--space-5);
  border-left: var(--rule-strong) solid var(--color-accent);
}

.checksum-card {
  align-items: end;
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.checksum-value code {
  display: block;
  max-width: 48rem;
  overflow-wrap: anywhere;
  color: var(--color-accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: clamp(0.8rem, 1.6vw, 1rem);
  line-height: 1.7;
}

.checksum-value button {
  margin-top: var(--space-5);
}

.copy-status {
  min-height: 1.5em;
  margin: var(--space-3) 0 0;
  color: var(--color-success);
}

footer {
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-10);
}

footer div {
  gap: var(--space-5);
}

footer a {
  color: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

@media (hover: hover) and (pointer: fine) {
  .primary-action:hover {
    transform: translateY(-0.2rem);
  }

  .text-action:hover,
  .language-switch:hover,
  .checksum-value button:hover {
    color: var(--color-accent);
  }
}

@media (max-width: 64rem) {
  .hero,
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-copy {
    grid-column: 1 / -1;
  }

  .identity-card {
    grid-column: 2;
  }
}

@media (max-width: 40rem) {
  .folio-nav {
    min-height: 4.5rem;
  }

  .release-stamp {
    display: none;
  }

  .hero,
  .notice,
  .continuity,
  .checksum-card,
  .section-heading,
  .feature-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    gap: var(--space-12);
    padding-block: var(--space-16);
  }

  h1 {
    font-size: clamp(3.2rem, 16vw, 5.3rem);
  }

  .identity-card,
  .hero-copy {
    grid-column: auto;
  }

  .identity-card {
    margin-right: var(--space-4);
  }

  .release-facts {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-5);
  }

  .notice {
    width: calc(100% + (var(--page-gutter) * 2));
  }

  .step-list li {
    grid-template-columns: 2rem minmax(0, 1fr);
  }

  footer,
  footer div {
    align-items: flex-start;
    flex-direction: column;
  }
}

@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;
  }
}