:root {
  --bg: #05070d;
  --panel: rgba(13, 22, 36, 0.74);
  --panel-strong: rgba(20, 35, 56, 0.88);
  --text: #f4f7fb;
  --muted: #a8b5c6;
  --line: rgba(132, 194, 255, 0.22);
  --cyan: #67e8f9;
  --green: #82f7a8;
  --amber: #ffd166;
  --red: #ff6b6b;
  --shadow: 0 24px 90px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 12%, rgba(103, 232, 249, 0.18), transparent 28rem),
    radial-gradient(circle at 86% 18%, rgba(130, 247, 168, 0.12), transparent 24rem),
    linear-gradient(145deg, #05070d 0%, #07111b 48%, #081018 100%);
  color: var(--text);
  font-family: Inter, "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

body.lang-zh {
  font-family: "Noto Sans SC", Inter, system-ui, sans-serif;
}

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

.starfield {
  position: fixed;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  opacity: 0.75;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(5, 7, 13, 0.72);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: lowercase;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(103, 232, 249, 0.58);
  background: linear-gradient(135deg, rgba(103, 232, 249, 0.18), rgba(130, 247, 168, 0.14));
  border-radius: 8px;
  color: var(--cyan);
  box-shadow: 0 0 28px rgba(103, 232, 249, 0.24);
}

.nav {
  display: flex;
  justify-content: center;
  gap: clamp(16px, 3vw, 34px);
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

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

.language-switch {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  width: 86px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
}

.lang-button {
  min-width: 36px;
  height: 30px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 800;
}

.lang-button.active {
  background: var(--cyan);
  color: #041015;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.78fr);
  gap: clamp(36px, 6vw, 80px);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: 64px clamp(20px, 6vw, 96px) 48px;
}

.hero-copy {
  max-width: 820px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  max-width: 950px;
  font-size: clamp(42px, 7vw, 86px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.05;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 22px;
  line-height: 1.2;
}

.hero-lede {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 21px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-action {
  background: var(--cyan);
  color: #031014;
  box-shadow: 0 16px 40px rgba(103, 232, 249, 0.22);
}

.secondary-action {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.orbital-panel {
  position: relative;
  min-height: 520px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(rgba(103, 232, 249, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(103, 232, 249, 0.05) 1px, transparent 1px),
    rgba(8, 18, 30, 0.52);
  background-size: 34px 34px;
  box-shadow: var(--shadow), inset 0 0 70px rgba(103, 232, 249, 0.08);
  overflow: hidden;
}

.core {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  width: 118px;
  height: 118px;
  place-items: center;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(103, 232, 249, 0.78);
  border-radius: 50%;
  background: rgba(5, 19, 27, 0.9);
  color: var(--cyan);
  font-size: 34px;
  font-weight: 900;
  box-shadow: 0 0 48px rgba(103, 232, 249, 0.36);
}

.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  border: 1px solid rgba(103, 232, 249, 0.28);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: rotate 18s linear infinite;
}

.orbit span {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  padding: 7px 10px;
  border: 1px solid rgba(130, 247, 168, 0.36);
  border-radius: 8px;
  background: rgba(4, 13, 19, 0.92);
  color: var(--text);
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.orbit-one {
  width: 230px;
  height: 230px;
}

.orbit-two {
  width: 330px;
  height: 330px;
  animation-duration: 25s;
  animation-direction: reverse;
}

.orbit-three {
  width: 430px;
  height: 430px;
  animation-duration: 34s;
}

.signal {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 22px rgba(255, 209, 102, 0.8);
}

.signal-a {
  top: 22%;
  left: 18%;
}

.signal-b {
  right: 16%;
  bottom: 28%;
  background: var(--green);
}

.signal-c {
  right: 28%;
  top: 18%;
  background: var(--red);
}

.metrics,
.section,
.contact-section,
.site-footer {
  margin-inline: clamp(20px, 6vw, 96px);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.metrics div {
  padding: 26px;
  background: rgba(8, 18, 30, 0.78);
}

.metrics strong {
  display: block;
  color: var(--cyan);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
}

.metrics span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.section {
  padding: 112px 0 0;
}

.section-heading {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 28px;
  align-items: end;
  margin-bottom: 34px;
}

.vision-grid,
.product-grid,
.principles {
  display: grid;
  gap: 18px;
}

.vision-grid {
  grid-template-columns: repeat(4, 1fr);
}

.vision-grid article,
.product-card,
.principles article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
}

.vision-grid article {
  min-height: 290px;
  padding: 24px;
}

.number {
  display: inline-block;
  margin-bottom: 46px;
  color: var(--cyan);
  font-weight: 900;
}

.vision-grid p,
.product-card p,
.principles p {
  color: var(--muted);
}

.product-grid {
  grid-template-columns: repeat(3, 1fr);
}

.product-card {
  padding: 28px;
}

.product-card.featured {
  background: var(--panel-strong);
  border-color: rgba(103, 232, 249, 0.48);
}

.product-icon {
  display: grid;
  width: 46px;
  height: 46px;
  margin-bottom: 24px;
  place-items: center;
  border-radius: 8px;
  background: rgba(103, 232, 249, 0.12);
  color: var(--cyan);
  font-weight: 900;
}

.product-card ul {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.product-card li {
  position: relative;
  padding-left: 18px;
  color: var(--text);
  font-weight: 600;
}

.product-card li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  content: "";
}

.platform-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
}

.pipeline {
  display: grid;
  gap: 14px;
  align-content: center;
  min-height: 360px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(120deg, rgba(103, 232, 249, 0.1), transparent 48%),
    rgba(8, 18, 30, 0.76);
}

.pipeline span {
  display: block;
  padding: 16px 18px;
  border: 1px solid rgba(103, 232, 249, 0.25);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  font-weight: 800;
}

.principles article {
  padding: 26px;
}

.contact-section {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  margin-top: 112px;
  padding: 42px;
  border: 1px solid rgba(103, 232, 249, 0.38);
  border-radius: 8px;
  background:
    linear-gradient(105deg, rgba(103, 232, 249, 0.14), rgba(130, 247, 168, 0.08)),
    rgba(8, 18, 30, 0.86);
}

.contact-section h2 {
  max-width: 920px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 34px 0 46px;
  color: var(--muted);
}

@keyframes rotate {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .hero,
  .section-heading,
  .platform-layout,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 48px;
  }

  .orbital-panel {
    min-height: 420px;
  }

  .orbit-three {
    width: 350px;
    height: 350px;
  }

  .vision-grid,
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .site-header {
    padding: 14px 18px;
  }

  .brand {
    font-size: 15px;
  }

  .nav {
    gap: 16px;
    font-size: 13px;
  }

  .hero {
    padding-inline: 18px;
  }

  .metrics,
  .section,
  .contact-section,
  .site-footer {
    margin-inline: 18px;
  }

  .metrics,
  .vision-grid,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .orbital-panel {
    min-height: 340px;
  }

  .orbit-one {
    width: 170px;
    height: 170px;
  }

  .orbit-two {
    width: 240px;
    height: 240px;
  }

  .orbit-three {
    width: 310px;
    height: 310px;
  }

  .section {
    padding-top: 76px;
  }

  .contact-section {
    padding: 28px;
  }

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