:root {
  color-scheme: light;
  --ink: #121725;
  --ink-soft: #4a5265;
  --muted: #6f7788;
  --paper: #fbfcff;
  --panel: rgba(255, 255, 255, 0.76);
  --line: rgba(31, 45, 72, 0.11);
  --cyan: #40c0d7;
  --blue: #224d9a;
  --violet: #62549e;
  --orange: #f39a3d;
  --green: #58c878;
  --shadow: 0 28px 90px rgba(36, 58, 107, 0.14);
  --radius: 34px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 18% 16%, rgba(64, 192, 215, 0.22), transparent 32rem),
    radial-gradient(circle at 80% 12%, rgba(98, 84, 158, 0.26), transparent 34rem),
    radial-gradient(circle at 88% 54%, rgba(34, 77, 154, 0.16), transparent 30rem),
    linear-gradient(180deg, #ffffff 0%, #f7f9ff 48%, #eef5f9 100%);
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.65), rgba(255, 255, 255, 0)),
    radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.95), transparent 28rem);
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 20px clamp(22px, 6vw, 86px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(24px) saturate(1.25);
}

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

.brand-symbol {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 74px;
  height: 30px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--cyan), #39acd1);
  box-shadow: 0 12px 26px rgba(64, 192, 215, 0.2);
}

.brand-symbol::before,
.brand-symbol::after {
  position: absolute;
  content: "";
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: inherit;
}

.brand-symbol::before {
  left: -13px;
}

.brand-symbol::after {
  right: -13px;
}

.brand-symbol i {
  position: relative;
  z-index: 1;
  width: 9px;
  height: 9px;
  margin: 0 3px;
  border-radius: 50%;
  background: #473285;
}

.brand-text {
  color: var(--ink);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.08em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  color: rgba(18, 23, 37, 0.68);
  font-size: 14px;
  font-weight: 600;
}

nav a {
  text-decoration: none;
  transition: color 160ms ease;
}

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

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  place-items: center;
  min-height: calc(100vh - 78px);
  padding: 78px clamp(20px, 5vw, 72px) 96px;
  overflow: hidden;
}

.ambient {
  position: absolute;
  border-radius: 999px;
  filter: blur(34px);
  opacity: 0.86;
  pointer-events: none;
}

.ambient-cyan {
  top: 118px;
  left: 6vw;
  width: 330px;
  height: 170px;
  background: rgba(64, 192, 215, 0.44);
}

.ambient-blue {
  top: 94px;
  right: 6vw;
  width: 390px;
  height: 200px;
  background: rgba(34, 77, 154, 0.38);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1040px;
  margin: 0 auto;
  text-align: center;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--violet);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 980px;
  margin-right: auto;
  margin-left: auto;
  margin-bottom: 24px;
  font-size: clamp(44px, 7.6vw, 96px);
  line-height: 1.04;
  letter-spacing: -0.075em;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(34px, 5.2vw, 70px);
  line-height: 1.06;
  letter-spacing: -0.055em;
}

h3 {
  margin-bottom: 12px;
  font-size: 22px;
  letter-spacing: -0.03em;
}

.lead {
  max-width: 820px;
  margin: 0 auto;
  color: var(--ink-soft);
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.78;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  box-shadow: 0 18px 42px rgba(34, 77, 154, 0.22);
}

.button.secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(31, 45, 72, 0.12);
}

.device-card {
  position: relative;
  z-index: 1;
  width: min(720px, calc(100vw - 40px));
  margin-top: 66px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.88);
  border-radius: 42px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.52)),
    rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow);
  backdrop-filter: blur(26px);
}

.device-top {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
}

.device-top span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
}

.device-top span + span {
  background: var(--cyan);
}

.device-screen {
  display: grid;
  place-items: center;
  min-height: 230px;
  padding: 36px;
  text-align: center;
  border-radius: 30px;
  background:
    radial-gradient(circle at 16% 40%, rgba(64, 192, 215, 0.55), transparent 19rem),
    radial-gradient(circle at 83% 35%, rgba(34, 77, 154, 0.54), transparent 21rem),
    linear-gradient(135deg, #f7fbff, #edf3ff);
}

.device-screen p {
  margin: 0;
  color: rgba(18, 23, 37, 0.52);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.device-screen strong {
  display: block;
  max-width: 520px;
  margin-top: 12px;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.045em;
}

.signal-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 18px 0 8px;
}

.signal-row i {
  width: 42px;
  height: 5px;
  border-radius: 999px;
  background: var(--cyan);
}

.signal-row i:nth-child(2) {
  background: var(--violet);
}

.signal-row i:nth-child(3) {
  background: var(--orange);
}

.signal-row i:nth-child(4) {
  background: var(--blue);
}

.signal-row i:nth-child(5) {
  background: var(--green);
}

.section {
  padding: clamp(76px, 9vw, 136px) clamp(20px, 6vw, 92px);
}

.section.narrow {
  max-width: 1120px;
  margin: 0 auto;
  text-align: center;
}

.big-copy {
  max-width: 900px;
  margin: 0 auto;
  color: var(--ink-soft);
  font-size: clamp(18px, 2.1vw, 24px);
  line-height: 1.8;
}

.section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 30px;
}

.section-title h2 {
  max-width: 760px;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.scene-grid article,
.system-node,
.geo-card,
.contact-card {
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 18px 60px rgba(36, 58, 107, 0.08);
  backdrop-filter: blur(22px);
}

.scene-grid article {
  min-height: 330px;
  padding: 30px;
}

.scene-grid span,
.system-node span {
  display: inline-flex;
  margin-bottom: 80px;
  color: var(--orange);
  font-weight: 900;
  letter-spacing: -0.03em;
}

.scene-grid p,
.system-node p,
.geo-card p,
.contact-copy p,
.contact-card p,
footer {
  color: var(--muted);
  line-height: 1.76;
}

.system-section {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.52)),
    radial-gradient(circle at 20% 20%, rgba(64, 192, 215, 0.18), transparent 28rem);
}

.system-map {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.system-node {
  min-height: 310px;
  padding: 28px;
}

.system-node.node-primary {
  color: #fff;
  background:
    radial-gradient(circle at 8% 10%, rgba(64, 192, 215, 0.7), transparent 18rem),
    linear-gradient(135deg, var(--blue), var(--violet));
}

.system-node.node-primary p,
.system-node.node-primary span {
  color: rgba(255, 255, 255, 0.82);
}

.geo-section,
.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(28px, 7vw, 96px);
}

.geo-card,
.contact-card {
  padding: clamp(28px, 4vw, 46px);
}

.geo-card a {
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

.contact-card {
  display: grid;
  gap: 14px;
}

.contact-card p {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 18px;
  margin: 0;
}

.contact-card strong {
  color: var(--ink);
}

.contact-card a {
  color: var(--blue);
  font-weight: 700;
  text-decoration: none;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 34px clamp(22px, 6vw, 86px);
  border-top: 1px solid var(--line);
}

@media (max-width: 980px) {
  .site-header,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-title,
  .geo-section,
  .contact-section {
    align-items: flex-start;
    grid-template-columns: 1fr;
  }

  .scene-grid,
  .system-map {
    grid-template-columns: 1fr;
  }

  .scene-grid article,
  .system-node {
    min-height: auto;
  }

  .scene-grid span,
  .system-node span {
    margin-bottom: 36px;
  }
}

@media (max-width: 560px) {
  nav {
    gap: 14px;
  }

  .brand img {
    width: 132px;
  }

  .brand-symbol {
    width: 58px;
    height: 24px;
  }

  .brand-symbol::before,
  .brand-symbol::after {
    width: 28px;
    height: 28px;
  }

  .brand-symbol i {
    width: 7px;
    height: 7px;
  }

  .brand-text {
    font-size: 19px;
  }

  .hero {
    padding-top: 54px;
  }

  .device-screen {
    min-height: 190px;
    padding: 24px;
  }

  .contact-card p {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}