:root {
  color-scheme: light;
  --color-ink: #171714;
  --color-paper: #f4f3ef;
  --color-cream: #fffaf2;
  --color-muted: #77756d;
  --color-line: #dedcd4;
  --color-focus: #9b5f29;
  --color-accent: #bd7b36;
  --shadow-panel: 0 28px 80px rgba(38, 30, 19, 0.11), 0 3px 12px rgba(38, 30, 19, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  margin: 0;
  overflow-x: hidden;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: "Inter", ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::selection {
  background: var(--color-accent);
  color: var(--color-cream);
}

img {
  display: block;
  height: auto;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

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

a:focus-visible,
button:focus-visible {
  border-radius: 6px;
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

.section-wide,
.site-header {
  width: calc(100% - 32px);
  max-width: 1040px;
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 100;
  padding: 11px 18px;
  transform: translateY(-160%);
  border-radius: 999px;
  background: var(--color-ink);
  color: var(--color-cream);
  font-size: 13px;
  font-weight: 600;
  transition: transform 200ms ease;
}

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

.site-header {
  display: flex;
  height: 68px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-line);
}

.brand {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.primary-nav a {
  display: flex;
  min-height: 44px;
  align-items: center;
  color: #7a786f;
  font-size: 12px;
  font-weight: 500;
  transition: color 150ms ease, opacity 150ms ease;
}

.primary-nav a:hover {
  color: var(--color-ink);
}

.primary-nav .nav-features {
  display: none;
}

.primary-nav .nav-github {
  gap: 5px;
  color: var(--color-ink);
  font-weight: 700;
  white-space: nowrap;
}

.nav-github-stars {
  display: inline-flex;
  align-items: center;
  gap: 1px;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  white-space: nowrap;
}

.nav-github-bracket,
.nav-github-star {
  display: inline-flex;
  height: 1em;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.nav-github-bracket {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 11px;
}

.nav-github-star {
  font-family: "Apple Color Emoji", sans-serif;
  font-size: 11px;
}

.primary-nav .nav-github:hover {
  opacity: 0.6;
}

.language-toggle {
  min-height: 32px;
  padding-inline: 11px;
  border: 0;
  border-radius: 999px;
  background: #e9e5dd;
  color: #5f5b53;
  font: inherit;
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease;
}

.language-toggle:hover {
  background: #ddd8ce;
  color: var(--color-ink);
}

.hero {
  padding-block: 72px 150px;
}

.hero-copy {
  max-width: 760px;
  margin-inline: auto;
}

.site-footer {
  max-width: 720px;
  margin-inline: auto;
}

.app-icon {
  width: 76px;
  height: 76px;
  margin-bottom: 34px;
  object-fit: contain;
}

.hero h1 {
  max-width: 760px;
  margin-left: -0.04em;
  font-size: 42px;
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

.hero-lede {
  max-width: 650px;
  margin-top: 18px;
  color: var(--color-muted);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.035em;
}

.hero-actions,
.footer-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.hero-actions {
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  transition: background-color 150ms ease;
}

.button-primary {
  padding-inline: 18px;
  background: var(--color-ink);
  color: var(--color-cream);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.hero-actions .button-primary {
  min-height: 46px;
  gap: 9px;
  padding-inline: 20px;
  font-size: 13px;
}

.hero-actions .button-primary i {
  font-size: 15px;
}

.platform-note {
  color: #8b887f;
  font-size: 12px;
  font-weight: 500;
}

.hero-visual {
  max-width: 980px;
  margin: 86px auto 0;
}

.hero-visual img {
  width: 100%;
  border-radius: 19px;
  box-shadow: var(--shadow-panel);
}

.features {
  max-width: 880px;
  padding-bottom: 180px;
}

.feature-card {
  --stack-scale: 1;
  --stack-shift: 0px;
  position: sticky;
  top: 24px;
  display: flex;
  min-height: 520px;
  margin-bottom: 28px;
  padding: 28px;
  align-items: flex-end;
  overflow: hidden;
  border-radius: 24px;
  transform: translateY(var(--stack-shift)) scale(var(--stack-scale));
  transform-origin: center top;
}

.feature-card:last-child {
  margin-bottom: 0;
}

.feature-card-make {
  top: 24px;
  z-index: 1;
  background: #e9e5dd;
  color: #514d45;
}

.feature-card-copy {
  top: 40px;
  z-index: 2;
  background: #dfe8ed;
  color: #31566a;
}

.feature-card-hide {
  top: 24px;
  z-index: 3;
  background: #e2e6d4;
  color: #4d5938;
}

.feature-card-info {
  top: 40px;
  z-index: 4;
  background: #e6e0eb;
  color: #594b68;
}

.feature-number {
  position: absolute;
  top: 34px;
  right: 28px;
  color: currentColor;
  font-size: clamp(112px, 34vw, 190px);
  font-weight: 800;
  line-height: 0.78;
  letter-spacing: -0.09em;
  opacity: 0.14;
  user-select: none;
}

.feature-card-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 760px;
}

.feature-eyebrow {
  margin-bottom: 15px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.feature-eyebrow-make,
.feature-eyebrow-copy,
.feature-eyebrow-hide,
.feature-eyebrow-info {
  color: currentColor;
  opacity: 0.72;
}

.feature-card h3 {
  margin-left: -0.035em;
  font-size: 36px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.052em;
}

.feature-description {
  max-width: 620px;
  margin-top: 20px;
  color: currentColor;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: -0.02em;
  opacity: 0.75;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.feature-tags li {
  padding: 8px 13px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  opacity: 0.78;
}

.privacy {
  display: flex;
  min-height: 680px;
  max-width: 1280px;
  padding-block: 72px 140px;
  flex-direction: column;
  align-items: center;
  color: var(--color-ink);
  text-align: center;
}

.privacy-kicker {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.privacy h2 {
  max-width: 1280px;
  margin-top: 64px;
  font-size: clamp(43px, 12vw, 74px);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.065em;
}

[lang="zh-CN"] .privacy h2 {
  line-height: 1.08;
}

.privacy-summary {
  max-width: 600px;
  margin-top: 76px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.025em;
}

.site-footer {
  display: flex;
  min-height: 720px;
  width: calc(100% - 32px);
  flex-direction: column;
  justify-content: flex-end;
  padding-block: 180px 70px;
}

.footer-icon {
  width: 72px;
  height: 72px;
  margin-bottom: 26px;
  object-fit: contain;
}

.footer-tagline {
  margin-left: -0.03em;
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
}

.footer-actions {
  gap: 10px;
  margin-top: 24px;
}

.button-secondary {
  gap: 7px;
  padding-inline: 16px;
  background: #e4e1d9;
  color: #4f4c45;
}

.button-secondary:hover {
  background: #d9d5cb;
}

.button-secondary i {
  font-size: 15px;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 22px;
  color: #858178;
  font-size: 10px;
  font-weight: 500;
}

.footer-meta a {
  text-decoration: underline;
  text-decoration-color: #c4c0b5;
  text-underline-offset: 3px;
}

.footer-meta a:hover {
  color: var(--color-ink);
}

@media (max-width: 639px) {
  .nav-github-bracket {
    transform: translateY(-0.05em);
  }

  .nav-github-star {
    transform: translateY(-0.04em);
  }

  .nav-github-stars [data-github-stars] {
    display: inline-flex;
    transform: translateY(0.04em);
  }
}

@media (min-width: 640px) {
  .primary-nav {
    gap: 28px;
  }

  .primary-nav .nav-features {
    display: flex;
  }

  .hero {
    padding-block: 96px 220px;
  }

  .app-icon {
    width: 88px;
    height: 88px;
  }

  .hero h1 {
    max-width: 980px;
    font-size: 66px;
    line-height: 1;
  }

  .hero-copy {
    max-width: 680px;
  }

  .hero-lede {
    font-size: 29px;
    line-height: 1.3;
  }

  .hero-visual {
    margin-top: 118px;
  }

  .hero-visual img {
    border-radius: 26px;
  }

  .features {
    padding-bottom: 240px;
  }

  .feature-card {
    top: 72px;
    min-height: 560px;
    margin-bottom: 32px;
    padding: 44px;
    border-radius: 28px;
  }

  .feature-card-copy {
    top: 96px;
  }

  .feature-card-hide {
    top: 72px;
  }

  .feature-card-info {
    top: 96px;
  }

  .feature-number {
    top: 48px;
    right: 52px;
    font-size: clamp(180px, 22vw, 260px);
  }

  .feature-card h3 {
    font-size: 52px;
  }

  .feature-description {
    font-size: 20px;
  }

  .feature-tags {
    gap: 10px;
    margin-top: 26px;
  }

  .feature-tags li {
    padding: 9px 15px;
    font-size: 13px;
  }

  .privacy {
    min-height: 860px;
    padding-block: 90px 170px;
  }

  .privacy-kicker {
    font-size: 17px;
  }

  .privacy h2 {
    margin-top: 80px;
    font-size: clamp(76px, 8.3vw, 120px);
    line-height: 0.94;
  }

  .privacy-summary {
    max-width: 640px;
    margin-top: 110px;
    font-size: 20px;
  }

  .site-footer {
    min-height: 900px;
    padding-bottom: 96px;
  }

  .footer-tagline {
    font-size: 46px;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding-bottom: 200px;
  }

  .features {
    padding-bottom: 200px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .feature-card {
    --stack-scale: 1 !important;
  }
}