:root {
  --bg: #071018;
  --panel: rgba(14, 28, 39, 0.78);
  --panel-solid: #0f1b24;
  --text: #eef7ff;
  --muted: #92a7b5;
  --line: rgba(126, 211, 255, 0.18);
  --cyan: #54d8ff;
  --green: #67f0b0;
  --amber: #ffd166;
  --blue: #1f7cff;
  --shadow: 0 32px 100px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  font-family:
    "PingFang SC",
    "Microsoft YaHei",
    "Noto Sans SC",
    sans-serif;
  background:
    radial-gradient(circle at 18% 12%, rgba(84, 216, 255, 0.24), transparent 28rem),
    radial-gradient(circle at 78% 4%, rgba(103, 240, 176, 0.16), transparent 30rem),
    linear-gradient(135deg, #071018 0%, #0b1720 48%, #06131b 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background-image:
    linear-gradient(rgba(84, 216, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(84, 216, 255, 0.06) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.75), transparent 82%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0;
  backdrop-filter: blur(18px);
}

.brand,
.nav,
.hero-actions,
.metrics,
.timeline,
.contact {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: #06131b;
  background: linear-gradient(135deg, var(--cyan), var(--green));
  border-radius: 12px;
  box-shadow: 0 0 34px rgba(84, 216, 255, 0.42);
}

.nav {
  gap: 26px;
  color: var(--muted);
  font-size: 14px;
}

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

.hero,
.section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 54px;
  align-items: center;
  min-height: calc(100vh - 74px);
  padding: 44px 0 88px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(44px, 7vw, 92px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4vw, 58px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.hero-text,
.section-heading p,
.flow-copy p,
.contact p {
  max-width: 650px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.contact .contact-line,
.contact .icp {
  margin-bottom: 0;
  font-size: 15px;
  line-height: 1.7;
}

.contact .contact-line {
  color: var(--text);
}

.contact .icp {
  color: rgba(238, 247, 255, 0.68);
}

.hero-actions {
  gap: 14px;
  flex-wrap: wrap;
  margin: 34px 0 38px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  font-weight: 800;
  border-radius: 999px;
}

.primary-action {
  color: #04141d;
  background: linear-gradient(135deg, var(--cyan), var(--green));
  box-shadow: 0 18px 60px rgba(84, 216, 255, 0.28);
}

.secondary-action {
  color: var(--text);
  border: 1px solid var(--line);
}

.metrics {
  gap: 12px;
  flex-wrap: wrap;
}

.metrics div {
  min-width: 132px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--line);
  border-radius: 18px;
}

.metrics dt {
  font-size: 30px;
  font-weight: 900;
}

.metrics dd {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 620px;
}

.orbital {
  position: absolute;
  width: min(90vw, 520px);
  aspect-ratio: 1;
  border: 1px solid rgba(84, 216, 255, 0.28);
  border-radius: 50%;
  box-shadow:
    inset 0 0 80px rgba(84, 216, 255, 0.1),
    0 0 90px rgba(31, 124, 255, 0.18);
}

.orbital::before,
.orbital::after {
  position: absolute;
  inset: 12%;
  content: "";
  border: 1px dashed rgba(103, 240, 176, 0.28);
  border-radius: 50%;
}

.orbital::after {
  inset: 30%;
  border-style: solid;
  border-color: rgba(255, 209, 102, 0.2);
}

.hero-visual img {
  position: relative;
  width: min(310px, 72vw);
  border: 8px solid rgba(226, 244, 255, 0.13);
  border-radius: 40px;
  box-shadow: var(--shadow), 0 0 80px rgba(84, 216, 255, 0.18);
  transform: rotate(2deg);
}

.section {
  padding: 94px 0;
}

.section-heading {
  margin-bottom: 34px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid article {
  min-height: 250px;
  padding: 24px;
  background: linear-gradient(180deg, rgba(19, 41, 55, 0.88), rgba(11, 24, 34, 0.82));
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.2);
}

.feature-index {
  display: inline-flex;
  margin-bottom: 40px;
  color: var(--cyan);
  font-weight: 900;
}

.feature-grid p {
  color: var(--muted);
  line-height: 1.7;
}

.flow {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 42px;
  align-items: center;
}

.timeline {
  gap: 12px;
  align-items: stretch;
}

.timeline div {
  flex: 1;
  min-height: 180px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.048);
  border: 1px solid var(--line);
  border-radius: 22px;
}

.timeline strong,
.timeline span {
  display: block;
}

.timeline strong {
  margin-bottom: 46px;
  color: var(--amber);
  font-size: 22px;
}

.timeline span {
  color: var(--muted);
  line-height: 1.6;
}

.phone-wall {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 1fr);
  gap: 16px;
  align-items: start;
}

.phone-card {
  margin: 0;
  padding: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.22);
}

.phone-card.large {
  grid-row: span 2;
}

.phone-card img {
  display: block;
  width: 100%;
  max-height: 680px;
  object-fit: cover;
  object-position: top center;
  border-radius: 18px;
}

.phone-card:not(.large) img {
  max-height: 330px;
}

.phone-card figcaption {
  padding: 14px 4px 2px;
  color: var(--muted);
  font-size: 14px;
}

.contact {
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 70px;
  padding: 38px;
  background:
    linear-gradient(135deg, rgba(84, 216, 255, 0.16), transparent 52%),
    var(--panel-solid);
  border: 1px solid var(--line);
  border-radius: 30px;
}

.contact h2 {
  max-width: 780px;
}

@media (max-width: 980px) {
  .nav {
    display: none;
  }

  .hero,
  .flow {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-visual {
    min-height: 520px;
  }

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

  .timeline {
    flex-direction: column;
  }

  .timeline strong {
    margin-bottom: 18px;
  }

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

  .phone-card.large {
    grid-row: auto;
  }
}

@media (max-width: 620px) {
  .site-header,
  .hero,
  .section {
    width: min(100% - 28px, 1180px);
  }

  .hero {
    padding-top: 24px;
  }

  .hero-text,
  .section-heading p,
  .flow-copy p,
  .contact p {
    font-size: 16px;
  }

  .hero-visual {
    min-height: 440px;
  }

  .feature-grid,
  .phone-wall {
    grid-template-columns: 1fr;
  }

  .feature-grid article {
    min-height: auto;
  }

  .feature-index {
    margin-bottom: 22px;
  }

  .phone-card img,
  .phone-card:not(.large) img {
    max-height: 560px;
  }

  .contact {
    align-items: flex-start;
    flex-direction: column;
    padding: 26px;
  }
}