:root {
  color-scheme: light;
  --ink: #111111;
  --muted: #666666;
  --soft: #8a8a8a;
  --background: #ffffff;
  --surface: #f5f5f5;
  --line: #e8e8e8;
  --coral: #ff5a36;
  --blue: #3b82f6;
  --yellow: #f4c542;
  --green: #5dbb63;
  --radius-card: 16px;
  --radius-button: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--background);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", sans-serif;
  letter-spacing: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-nav {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  gap: 10px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
}

.brand-link img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(17, 17, 17, 0.12);
}

.nav-links {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: 6px;
}

.nav-links a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 12px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.nav-links a:hover {
  background: var(--surface);
  color: var(--ink);
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
}

.language-switch button {
  min-height: 30px;
  border: 0;
  border-radius: 10px;
  padding: 0 10px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.language-switch button.is-active {
  background: var(--ink);
  color: #ffffff;
}

.hero {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  min-height: calc(100svh - 72px);
  padding: 40px 0 72px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
  align-items: center;
  gap: 64px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

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

h1 {
  max-width: 680px;
  margin-bottom: 18px;
  font-size: clamp(44px, 7vw, 82px);
  line-height: 0.96;
  letter-spacing: 0;
}

.lead {
  max-width: 610px;
  margin-bottom: 28px;
  color: #3f3f3f;
  font-size: 18px;
  line-height: 1.55;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 18px;
  border-radius: var(--radius-button);
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.button.primary {
  border-color: var(--ink);
  background: var(--ink);
  color: #ffffff;
}

.button:hover {
  transform: translateY(-1px);
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 650px;
}

.screenshot-stage {
  width: min(430px, 86vw);
  min-height: 650px;
  position: relative;
}

.screenshot-card {
  display: block;
  width: 280px;
  border-radius: 32px;
  background: #ffffff;
  box-shadow: 0 28px 70px rgba(17, 17, 17, 0.18);
}

.screenshot-card-main {
  position: relative;
  z-index: 2;
}

.screenshot-card-secondary {
  position: absolute;
  z-index: 1;
  right: 0;
  top: 62px;
  width: 230px;
  opacity: 0.78;
}

.app-icon-card {
  position: absolute;
  left: 0;
  bottom: 34px;
  width: 116px;
  height: 116px;
  border-radius: 26px;
  background: #ffffff;
  box-shadow: 0 18px 48px rgba(17, 17, 17, 0.14);
  display: grid;
  place-items: center;
}

.app-icon-card img {
  width: 84px;
  height: 84px;
  border-radius: 20px;
}

.feature-band {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0;
}

.section h2 {
  margin-bottom: 28px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.08;
  letter-spacing: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature {
  min-height: 170px;
  padding: 22px;
  border-radius: var(--radius-card);
  background: #ffffff;
  border: 1px solid var(--line);
}

.feature-mark {
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  border-radius: 10px;
  background: var(--ink);
}

.feature:nth-child(2) .feature-mark { background: var(--blue); }
.feature:nth-child(3) .feature-mark { background: var(--green); }

.feature h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.feature p,
.content-card p,
.content-card li {
  color: var(--muted);
  line-height: 1.65;
}

.content-page {
  width: min(820px, calc(100% - 40px));
  margin: 0 auto;
  padding: 40px 0 72px;
}

.content-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: #ffffff;
  overflow-wrap: anywhere;
}

.content-card + .content-card {
  margin-top: 16px;
}

.content-card h1 {
  margin-bottom: 10px;
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.02;
}

.content-card h2 {
  margin: 28px 0 12px;
  font-size: 22px;
}

.content-card ul {
  margin: 0;
  padding-left: 22px;
}

.muted {
  color: var(--muted);
}

.site-footer {
  width: min(1120px, calc(100% - 40px));
  margin: auto auto 0;
  padding: 28px 0 36px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  color: var(--soft);
  font-size: 13px;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

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

@media (max-width: 860px) {
  .site-nav {
    width: min(100% - 28px, 1120px);
    gap: 12px;
  }

  .nav-links {
    gap: 4px;
  }

  .brand-link span {
    white-space: nowrap;
  }

  .hero {
    width: min(100% - 28px, 1120px);
    min-height: auto;
    padding: 34px 0 54px;
    grid-template-columns: 1fr;
    gap: 34px;
  }

  h1 {
    font-size: 48px;
  }

  .lead {
    font-size: 17px;
  }

  .hero-visual {
    min-height: auto;
  }

  .screenshot-stage {
    width: min(100%, 390px);
    min-height: 590px;
  }

  .screenshot-card {
    width: min(255px, 72vw);
    border-radius: 28px;
  }

  .screenshot-card-secondary {
    width: min(210px, 58vw);
    top: 54px;
  }

  .app-icon-card {
    display: none;
  }

  .section,
  .content-page,
  .site-footer {
    width: min(100% - 28px, 1120px);
  }

  .section {
    padding: 52px 0;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .content-card {
    padding: 22px;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .site-nav {
    width: min(100% - 72px, 1120px);
    height: 64px;
    gap: 8px;
  }

  .brand-link {
    gap: 8px;
    font-size: 13px;
  }

  .brand-link img {
    width: 28px;
    height: 28px;
    border-radius: 7px;
  }

  .nav-links a {
    display: none;
  }

  .language-switch {
    padding: 2px;
  }

  .language-switch button {
    min-height: 28px;
    padding: 0 7px;
    font-size: 12px;
  }

  h1 {
    font-size: 42px;
  }

  .cta-row .button {
    width: 100%;
    min-width: 0;
    white-space: normal;
    text-align: center;
    line-height: 1.2;
    padding-top: 12px;
    padding-bottom: 12px;
  }
}