:root {
  color-scheme: dark;
  --bg: #041218;
  --panel: rgba(255, 255, 255, 0.08);
  --panel-strong: rgba(255, 255, 255, 0.14);
  --text: #f4fbfb;
  --muted: #a9bdc3;
  --mint: #13e4cc;
  --mint-soft: rgba(19, 228, 204, 0.18);
  --orange: #ff8b2d;
  --line: rgba(255, 255, 255, 0.14);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 72% 18%, rgba(19, 228, 204, 0.25), transparent 24rem),
    radial-gradient(circle at 15% 76%, rgba(45, 135, 255, 0.18), transparent 22rem),
    linear-gradient(145deg, #031017, #071d25 48%, #02090d);
  color: var(--text);
}

a {
  color: inherit;
}

.page {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: 100vh;
  padding: 28px 0 72px;
}

.nav,
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand,
.nav-links,
.footer {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand,
.nav-links a,
.footer a,
.back-link {
  text-decoration: none;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--mint), #0797ff);
  color: #031017;
}

.nav-links,
.footer {
  color: var(--muted);
  font-size: 14px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 410px;
  gap: 64px;
  align-items: center;
  padding: 88px 0 24px;
}

.hero-copy h1,
.section h2,
.document h1 {
  margin: 0;
  letter-spacing: -0.055em;
}

.hero-copy h1 {
  max-width: 720px;
  font-size: clamp(52px, 8vw, 92px);
  line-height: 0.92;
}

.lead {
  max-width: 610px;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.6;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0 22px;
  font-weight: 750;
  text-decoration: none;
}

.primary {
  background: var(--mint);
  color: #001014;
  box-shadow: 0 18px 40px rgba(19, 228, 204, 0.24);
}

.secondary {
  background: var(--panel);
  border: 1px solid var(--line);
}

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

.phone-card {
  position: relative;
  aspect-ratio: 0.58;
  border-radius: 44px;
  padding: 14px;
  background: linear-gradient(145deg, rgba(255,255,255,0.18), rgba(255,255,255,0.03));
  box-shadow: 0 50px 120px rgba(0,0,0,0.42);
}

.phone-screen {
  position: relative;
  overflow: hidden;
  height: 100%;
  border-radius: 34px;
  background:
    linear-gradient(180deg, rgba(4, 18, 24, 0), rgba(4, 18, 24, 0.92)),
    radial-gradient(circle at 60% 20%, rgba(19, 228, 204, 0.28), transparent 10rem),
    linear-gradient(150deg, #08232f, #02080c);
}

.shuttle {
  position: absolute;
  top: 18%;
  right: 17%;
  width: 110px;
  height: 150px;
  transform: rotate(35deg);
  border-radius: 80% 20% 70% 30%;
  background:
    radial-gradient(circle at 50% 92%, #e8f5f5 0 20%, #101c22 21% 28%, transparent 29%),
    repeating-conic-gradient(from -20deg at 50% 72%, #ffffff 0 7deg, #dce9ec 8deg 13deg);
  filter: drop-shadow(0 0 30px rgba(19, 228, 204, 0.65));
}

.trail {
  position: absolute;
  width: 420px;
  height: 420px;
  left: -32%;
  top: 24%;
  border-radius: 50%;
  border: 10px solid transparent;
  border-left-color: var(--mint);
  border-bottom-color: rgba(19, 228, 204, 0.75);
  transform: rotate(22deg);
  filter: blur(0.2px) drop-shadow(0 0 18px rgba(19, 228, 204, 0.9));
}

.trail-two {
  width: 330px;
  height: 330px;
  left: -10%;
  top: 31%;
  border-width: 4px;
  border-style: dashed;
  opacity: 0.85;
}

.metric-card {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 28px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(4, 18, 24, 0.72);
  backdrop-filter: blur(16px);
}

.metric-label,
.metric-unit {
  display: block;
  color: var(--muted);
  font-weight: 700;
}

.metric-card strong {
  display: block;
  margin: 6px 0 0;
  font-size: 68px;
  letter-spacing: -0.07em;
}

.metric-unit {
  color: var(--mint);
  font-size: 24px;
}

.section {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

.section h2 {
  max-width: 820px;
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
}

.card {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
}

.card h3 {
  margin: 0 0 14px;
  font-size: 22px;
}

.card p,
.section p,
.document p,
.document li {
  color: var(--muted);
  line-height: 1.7;
}

.split {
  display: grid;
  grid-template-columns: 0.9fr 1fr;
  gap: 44px;
  align-items: start;
}

.zh {
  margin-bottom: 72px;
  padding: 42px;
  border: 1px solid rgba(19, 228, 204, 0.22);
  border-radius: 34px;
  background: var(--mint-soft);
}

.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 44px;
  border-top: 1px solid var(--line);
}

.document {
  width: min(820px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 84px;
}

.document h1 {
  margin-top: 32px;
  font-size: clamp(42px, 7vw, 72px);
}

.document h2 {
  margin-top: 34px;
}

.document hr {
  margin: 52px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.back-link {
  color: var(--mint);
  font-weight: 800;
}

@media (max-width: 900px) {
  .hero-grid,
  .split {
    grid-template-columns: 1fr;
  }

  .phone-card {
    width: min(410px, 100%);
    margin: 0 auto;
  }

  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .nav,
  .footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-grid {
    padding-top: 56px;
  }

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

  .zh {
    padding: 28px;
  }
}