:root {
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "Avenir Next", "Segoe UI", sans-serif;
  color: #fff7e2;
  background: #0c1739;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: #0c1739;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 50% 10%, rgba(41, 192, 218, 0.15), transparent 34rem),
    #0c1739;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(180deg, rgba(6, 16, 48, 0.26), #0c1739 88%),
    url("assets/hero-backdrop.jpg") top center / min(1600px, 100vw) auto no-repeat;
  content: "";
}

a {
  color: inherit;
}

img,
video {
  display: block;
  max-width: 100%;
}

[data-locale][hidden] {
  display: none;
}

.landing {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.language {
  margin: 0;
  padding: 0;
  border: 0;
}

.language-toggle {
  position: fixed;
  top: max(18px, env(safe-area-inset-top));
  right: 20px;
  z-index: 10;
  padding: 10px 15px;
  border: 1px solid rgba(117, 239, 255, 0.48);
  border-radius: 999px;
  color: #dffbff;
  background: rgba(10, 25, 61, 0.84);
  box-shadow: 0 10px 32px rgba(3, 10, 34, 0.34);
  backdrop-filter: blur(14px);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 750;
  cursor: pointer;
}

.language-toggle:hover,
.language-toggle:focus-visible {
  border-color: #75efff;
  outline: none;
  transform: translateY(-1px);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  padding-right: 124px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand img {
  width: 52px;
  height: 52px;
  border-radius: 13px;
  box-shadow: 0 9px 28px rgba(4, 11, 36, 0.44);
}

.brand span {
  display: grid;
  gap: 1px;
}

.brand strong {
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.header-cta {
  padding: 9px 16px;
  border: 1px solid rgba(255, 215, 143, 0.4);
  border-radius: 999px;
  color: #fff4d8;
  background: rgba(18, 36, 78, 0.56);
  font-size: 0.84rem;
  font-weight: 750;
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.74fr);
  align-items: center;
  gap: clamp(42px, 8vw, 112px);
  min-height: calc(100vh - 88px);
  padding: 36px 0 88px;
}

.hero-copy {
  padding: 44px 0;
}

.eyebrow {
  margin: 0 0 18px;
  color: #75efff;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(3.6rem, 8vw, 7rem);
  line-height: 0.9;
  letter-spacing: -0.065em;
  text-shadow: 0 12px 40px rgba(3, 9, 32, 0.52);
}

[lang="zh-Hans"] h1 {
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.lead {
  max-width: 650px;
  margin-bottom: 34px;
  color: #c9ddea;
  font-size: clamp(1.08rem, 2vw, 1.32rem);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.app-store-link {
  display: inline-grid;
  min-width: 206px;
  padding: 12px 24px 13px;
  border: 1px solid rgba(255, 229, 174, 0.72);
  border-radius: 17px;
  color: #102653;
  background: linear-gradient(145deg, #fff8e8, #ffd994);
  box-shadow:
    0 15px 36px rgba(3, 10, 34, 0.38),
    inset 0 1px 0 #fff;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.online-play-link {
  border-color: rgba(117, 239, 255, 0.78);
  color: #102551;
  background: linear-gradient(135deg, #d9fbff, #75efff);
}

.app-store-link:hover,
.app-store-link:focus-visible {
  outline: none;
  box-shadow:
    0 19px 44px rgba(3, 10, 34, 0.48),
    0 0 0 4px rgba(117, 239, 255, 0.24),
    inset 0 1px 0 #fff;
  transform: translateY(-2px);
}

.cta-kicker {
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.1;
}

.app-store-link strong {
  margin-top: 1px;
  font-size: 1.36rem;
  line-height: 1.1;
}

.text-link {
  color: #dffbff;
  font-weight: 750;
  text-underline-offset: 5px;
}

.proof-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.proof-list li {
  padding: 8px 12px;
  border: 1px solid rgba(155, 210, 226, 0.22);
  border-radius: 999px;
  color: #bcd5e5;
  background: rgba(13, 31, 69, 0.5);
  font-size: 0.79rem;
}

.phone-stage {
  position: relative;
  display: grid;
  justify-items: center;
  align-items: center;
  min-height: 720px;
}

.phone-glow {
  position: absolute;
  width: min(520px, 90%);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(62, 231, 246, 0.28), rgba(255, 188, 142, 0.08) 44%, transparent 72%);
  filter: blur(10px);
}

.phone-frame {
  position: relative;
  width: min(382px, 92%);
  padding: 11px;
  border: 1px solid rgba(255, 229, 174, 0.8);
  border-radius: 54px;
  background: linear-gradient(145deg, #f9dfad, #78deef 38%, #213967 80%);
  box-shadow:
    0 44px 100px rgba(3, 9, 31, 0.62),
    0 0 0 1px rgba(255, 255, 255, 0.22);
  transform: rotate(1.25deg);
}

.phone-frame::before {
  position: absolute;
  top: 22px;
  left: 50%;
  z-index: 2;
  width: 108px;
  height: 28px;
  border-radius: 20px;
  background: #050a18;
  content: "";
  transform: translateX(-50%);
}

.phone-frame video {
  width: 100%;
  aspect-ratio: 886 / 1920;
  border-radius: 43px;
  background: #0d1739;
  object-fit: cover;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding: 72px 0 94px;
}

.feature-grid article {
  min-height: 260px;
  padding: 30px;
  border: 1px solid rgba(139, 208, 227, 0.18);
  border-radius: 28px;
  background:
    linear-gradient(145deg, rgba(27, 55, 101, 0.78), rgba(11, 28, 65, 0.88));
  box-shadow: 0 22px 52px rgba(4, 11, 35, 0.3);
}

.feature-grid article:nth-child(2) {
  border-color: rgba(117, 239, 255, 0.42);
  transform: translateY(-16px);
}

.feature-number {
  display: inline-block;
  margin-bottom: 32px;
  color: #75efff;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.feature-grid h2 {
  margin-bottom: 14px;
  font-size: clamp(1.4rem, 2vw, 1.85rem);
}

.feature-grid p {
  margin-bottom: 0;
  color: #bcd2e2;
  line-height: 1.68;
}

.closing-cta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  margin: 22px 0 86px;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid rgba(255, 217, 148, 0.34);
  border-radius: 34px;
  background:
    radial-gradient(circle at 85% 0%, rgba(117, 239, 255, 0.16), transparent 44%),
    linear-gradient(145deg, rgba(27, 57, 105, 0.9), rgba(12, 29, 68, 0.94));
  box-shadow: 0 28px 72px rgba(3, 10, 34, 0.38);
}

.closing-cta > img {
  width: 116px;
  height: 116px;
  border-radius: 28px;
  box-shadow: 0 14px 32px rgba(3, 10, 34, 0.44);
}

.closing-cta .eyebrow {
  margin-bottom: 8px;
}

.closing-cta h2 {
  margin-bottom: 8px;
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.closing-cta p {
  margin-bottom: 0;
  color: #bad3e3;
}

.app-store-link.compact {
  min-width: 190px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0 max(40px, env(safe-area-inset-bottom));
  border-top: 1px solid rgba(144, 201, 220, 0.14);
  color: #88a5bb;
  font-size: 0.86rem;
}

.site-footer p {
  margin: 0;
}

.site-footer nav {
  display: flex;
  gap: 24px;
}

.site-footer a {
  color: #b9d1e1;
  text-underline-offset: 4px;
}

/* Legal, support, and Universal Link fallback pages */
main:not(.landing) {
  width: min(720px, calc(100% - 40px));
  margin: 0 auto;
  padding: 64px 0 96px;
}

main:not(.landing) h1,
main:not(.landing) h2 {
  color: #fff7e2;
}

main:not(.landing) p,
main:not(.landing) li {
  color: #c3d6e4;
  line-height: 1.7;
}

.meta {
  color: #8daabd;
}

.challenge-page {
  width: min(560px, calc(100% - 32px));
  min-height: calc(100vh - 160px);
  display: grid;
  align-content: center;
  padding-top: 40px;
}

.challenge-card {
  padding: clamp(28px, 7vw, 52px);
  border: 1px solid rgba(117, 239, 255, 0.38);
  border-radius: 28px;
  background: linear-gradient(160deg, rgba(31, 61, 109, 0.95), rgba(13, 31, 70, 0.97));
  box-shadow: 0 24px 70px rgba(3, 10, 34, 0.42);
  text-align: center;
}

.challenge-card h1 {
  margin: 0;
}

.challenge-height {
  margin: 30px 0 20px;
}

.challenge-height strong {
  font-size: clamp(4rem, 20vw, 7rem);
  font-variant-numeric: tabular-nums;
  line-height: 0.9;
}

.challenge-height span {
  font-weight: 700;
}

.secondary-link {
  display: inline-block;
  padding: 12px 18px;
}

@media (max-width: 860px) {
  .landing {
    width: min(680px, calc(100% - 30px));
  }

  .site-header {
    padding-right: 112px;
  }

  .header-cta {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 8px;
    min-height: auto;
    padding-top: 30px;
  }

  .hero-copy {
    padding-bottom: 12px;
  }

  h1 {
    font-size: clamp(3.5rem, 17vw, 6rem);
  }

  .phone-stage {
    min-height: 690px;
  }

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

  .feature-grid article,
  .feature-grid article:nth-child(2) {
    min-height: 0;
    transform: none;
  }

  .closing-cta {
    grid-template-columns: auto 1fr;
  }

  .closing-cta .app-store-link {
    grid-column: 1 / -1;
    justify-self: stretch;
    text-align: center;
  }
}

@media (max-width: 520px) {
  .landing {
    width: min(100% - 24px, 440px);
  }

  .language-toggle {
    top: max(12px, env(safe-area-inset-top));
    right: 12px;
  }

  .site-header {
    min-height: 76px;
    padding-right: 98px;
  }

  .brand img {
    width: 44px;
    height: 44px;
    border-radius: 11px;
  }

  .hero {
    padding-bottom: 54px;
  }

  .hero-copy {
    padding-top: 28px;
  }

  h1 {
    margin-bottom: 20px;
    font-size: clamp(3.2rem, 18vw, 4.8rem);
  }

  .lead {
    font-size: 1.04rem;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 16px;
  }

  .app-store-link {
    text-align: center;
  }

  .text-link {
    align-self: center;
  }

  .proof-list {
    gap: 8px;
  }

  .proof-list li {
    width: 100%;
    border-radius: 14px;
    text-align: center;
  }

  .phone-stage {
    min-height: 610px;
  }

  .phone-frame {
    width: min(326px, 92%);
    border-radius: 48px;
  }

  .phone-frame video {
    border-radius: 38px;
  }

  .feature-grid {
    padding-top: 48px;
  }

  .closing-cta {
    grid-template-columns: 76px 1fr;
    gap: 18px;
  }

  .closing-cta > img {
    width: 76px;
    height: 76px;
    border-radius: 19px;
  }

  .closing-cta h2 {
    font-size: 1.8rem;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

  .app-store-link,
  .language-toggle {
    transition: none;
  }
}