:root {
  color-scheme: dark;
  --bg: #07110f;
  --panel: #0e1d1a;
  --panel-2: #142521;
  --text: #edf7f1;
  --muted: #a8bbb2;
  --line: rgba(237, 247, 241, 0.14);
  --mint: #63e6be;
  --cyan: #5bc7ff;
  --amber: #ffd166;
  --rose: #ff7b9c;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 22% 18%, rgba(91, 199, 255, 0.18), transparent 26rem),
    radial-gradient(circle at 82% 8%, rgba(255, 209, 102, 0.12), transparent 22rem),
    linear-gradient(135deg, #07110f 0%, #0b171a 48%, #111923 100%);
  color: var(--text);
}

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

.hero {
  min-height: 92vh;
  display: grid;
  grid-template-rows: auto 1fr;
  padding: 28px clamp(20px, 5vw, 72px) 56px;
}

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

.brand {
  font-size: 18px;
  font-weight: 760;
}

.nav-links {
  display: flex;
  gap: clamp(14px, 3vw, 34px);
  color: var(--muted);
  font-size: 14px;
}

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

.hero-grid {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  align-items: center;
  gap: clamp(34px, 6vw, 90px);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 720;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(48px, 7vw, 96px);
  line-height: 0.96;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1;
}

h3 {
  margin: 22px 0 10px;
  font-size: 22px;
}

.lead {
  max-width: 690px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.65;
}

.zh {
  color: #c9d8d2;
}

.orbit {
  position: relative;
  aspect-ratio: 1;
  min-width: 0;
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    rgba(14, 29, 26, 0.58);
  background-size: 42px 42px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.36);
}

.orbit::before {
  content: "";
  position: absolute;
  inset: 14%;
  border: 1px solid rgba(99, 230, 190, 0.22);
  transform: rotate(18deg);
}

.ring {
  position: absolute;
  inset: 19%;
  border: 1px solid rgba(91, 199, 255, 0.36);
  border-radius: 50%;
}

.ring-two {
  inset: 31%;
  border-color: rgba(255, 209, 102, 0.34);
}

.node {
  position: absolute;
  display: grid;
  place-items: center;
  min-width: 86px;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid rgba(237, 247, 241, 0.2);
  background: rgba(7, 17, 15, 0.82);
  border-radius: 8px;
  color: var(--text);
  font-weight: 720;
}

.node-core {
  width: 140px;
  height: 140px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-color: rgba(99, 230, 190, 0.58);
}

.node-core span {
  font-size: 44px;
}

.node-core small {
  color: var(--muted);
}

.node-a {
  left: 12%;
  top: 18%;
  color: var(--cyan);
}

.node-b {
  right: 9%;
  top: 26%;
  color: var(--amber);
}

.node-c {
  left: 15%;
  bottom: 18%;
  color: var(--rose);
}

.node-d {
  right: 14%;
  bottom: 16%;
  color: var(--mint);
}

.section {
  padding: 92px clamp(20px, 5vw, 72px);
}

.section-heading {
  width: min(780px, 100%);
  margin: 0 auto 34px;
}

.section-heading p:not(.eyebrow) {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.cards {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

article {
  min-height: 228px;
  padding: 26px;
  border: 1px solid var(--line);
  background: rgba(14, 29, 26, 0.72);
  border-radius: 8px;
}

article span {
  color: var(--amber);
  font-weight: 760;
}

article p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.band {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: clamp(28px, 6vw, 84px);
  align-items: end;
  padding: 86px clamp(20px, 5vw, 72px);
  border-block: 1px solid var(--line);
  background: rgba(237, 247, 241, 0.045);
}

.band > * {
  width: min(560px, 100%);
}

.band p {
  margin: 0;
  color: #c8d8d2;
  font-size: 20px;
  line-height: 1.7;
}

.compact {
  padding-bottom: 70px;
}

.split {
  width: min(980px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.78fr 1fr;
  gap: 32px;
}

.split p {
  margin: 0;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.75;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 26px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

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

@media (max-width: 820px) {
  .hero {
    min-height: auto;
    padding-bottom: 42px;
  }

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

  .hero-grid,
  .cards,
  .band,
  .split {
    grid-template-columns: 1fr;
  }

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

  .orbit {
    order: -1;
  }

  .cards {
    gap: 14px;
  }

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

@media (max-width: 520px) {
  h1 {
    font-size: 42px;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  .node {
    min-width: 72px;
    font-size: 13px;
  }

  .node-core {
    width: 112px;
    height: 112px;
  }

  .node-core span {
    font-size: 36px;
  }
}