:root {
  color-scheme: dark;
  --bg: #080b12;
  --panel: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.13);
  --text: #f7f8fb;
  --muted: #a9b0c0;
  --accent: #7c8cff;
  --accent-2: #5eead4;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(124, 140, 255, 0.22), transparent 34rem),
    radial-gradient(circle at 88% 25%, rgba(94, 234, 212, 0.13), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.shell {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.language-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
  color: var(--muted);
  font-size: 14px;
}

.language-links a {
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
  padding: 90px 0 72px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-2);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(44px, 7vw, 78px);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.lead {
  max-width: 720px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 2.2vw, 23px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.price-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.32);
}

.button.primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent), #a66cff);
}

.app-card {
  position: relative;
  min-height: 330px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 34px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.03));
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.4);
}

.app-card::before,
.app-card::after {
  position: absolute;
  content: "";
  border-radius: 50%;
  filter: blur(2px);
}

.app-card::before {
  width: 230px;
  height: 230px;
  top: 35px;
  left: 52px;
  background: linear-gradient(145deg, var(--accent), #a66cff);
  box-shadow: 0 22px 60px rgba(124, 140, 255, 0.42);
}

.app-card::after {
  width: 110px;
  height: 110px;
  right: 42px;
  bottom: 32px;
  background: var(--accent-2);
  opacity: 0.78;
}

.app-mark {
  position: absolute;
  z-index: 1;
  top: 112px;
  left: 101px;
  font-size: 72px;
  line-height: 1;
}

.section {
  padding: 78px 0;
  border-top: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.section-intro {
  max-width: 760px;
  margin: 0 0 34px;
  color: var(--muted);
  font-size: 18px;
}

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

.feature {
  min-height: 190px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
}

.feature h3 {
  margin: 0 0 10px;
  font-size: 19px;
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.zh {
  scroll-margin-top: 30px;
}

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
  padding: 36px 0 52px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links a {
  text-decoration: none;
}

@media (max-width: 780px) {
  header {
    align-items: flex-start;
    flex-direction: column;
  }

  .language-links {
    justify-content: flex-start;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 58px;
  }

  .app-card {
    min-height: 280px;
  }

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