:root {
  --ink: #172033;
  --muted: #667085;
  --line: #d9dee8;
  --panel: #ffffff;
  --soft: #f5f7fb;
  --brand: #1e6bff;
  --brand-dark: #0f3d91;
  --accent: #16a36f;
  --warning: #f59e0b;
  --footer: #f7f7f7;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #ffffff;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 clamp(20px, 6vw, 88px);
  border-bottom: 1px solid rgba(217, 222, 232, 0.72);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 800;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(30, 107, 255, 0.22);
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #344054;
  font-size: 14px;
}

.top-nav a:hover,
.site-footer a:hover {
  color: var(--brand);
}

.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  align-items: end;
  min-height: calc(100vh - 72px);
  padding: clamp(70px, 10vw, 128px) clamp(20px, 6vw, 88px) 76px;
  background:
    linear-gradient(90deg, rgba(6, 16, 34, 0.9) 0%, rgba(6, 16, 34, 0.68) 44%, rgba(6, 16, 34, 0.12) 100%),
    linear-gradient(180deg, rgba(6, 16, 34, 0.08) 0%, rgba(6, 16, 34, 0.58) 100%),
    url("assets/network-rack.jpg?v=3") center / cover no-repeat;
  background-color: #07162e;
}

.hero::after {
  position: absolute;
  inset: auto 0 0;
  z-index: -1;
  height: 28%;
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.96));
  content: "";
}

.hero-copy {
  max-width: 760px;
  color: #ffffff;
}

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

.hero .eyebrow {
  color: #7dd3fc;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(48px, 6vw, 84px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 660px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 20px;
  line-height: 1.8;
}

.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 22px;
  border-radius: 8px;
  font-weight: 750;
}

.primary-action {
  color: #ffffff;
  background: var(--brand);
  box-shadow: 0 16px 30px rgba(30, 107, 255, 0.2);
}

.secondary-action {
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.52);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
}

.hero-status {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 760px;
  margin-top: 42px;
}

.hero-status span {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(7, 18, 38, 0.45);
  backdrop-filter: blur(16px);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.18);
}

.hero-status span::before {
  width: 8px;
  height: 8px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(22, 163, 111, 0.18);
  content: "";
}

.device-panel {
  overflow: hidden;
  border: 1px solid rgba(183, 201, 238, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 28px 70px rgba(21, 35, 63, 0.14);
}

.panel-top {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: #f9fbff;
}

.panel-top span {
  width: 52px;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, #ff6b6b 0 10px, #ffd166 10px 24px, #16a36f 24px 38px);
}

.panel-top strong {
  font-size: 14px;
}

.panel-top em {
  justify-self: end;
  color: var(--accent);
  font-size: 13px;
  font-style: normal;
  font-weight: 800;
}

.network-map {
  display: grid;
  grid-template-columns: 1fr 52px 1fr 52px 1fr;
  align-items: center;
  padding: 34px 28px;
}

.node {
  min-height: 118px;
  padding: 20px 16px;
  border: 1px solid #d5e1f6;
  border-radius: 8px;
  background: #ffffff;
}

.node span,
.status-grid span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.node strong {
  display: block;
  margin-top: 14px;
  font-size: 18px;
}

.node-cloud {
  color: #ffffff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
}

.node-cloud span {
  color: rgba(255, 255, 255, 0.78);
}

.link-line {
  height: 2px;
  background: repeating-linear-gradient(90deg, #98b3e4 0 10px, transparent 10px 16px);
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
}

.status-grid div {
  padding: 18px;
  background: #ffffff;
}

.status-grid strong {
  display: block;
  margin-top: 8px;
  color: var(--accent);
}

.section {
  padding: 84px clamp(20px, 6vw, 88px);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 28px;
}

.section h2,
.scene-band h2 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.16;
  letter-spacing: 0;
}

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

.feature-grid article {
  min-height: 190px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.feature-grid h3 {
  margin-bottom: 14px;
  font-size: 21px;
}

.feature-grid p,
.scene-list {
  color: #576175;
  line-height: 1.75;
}

.scene-band {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(280px, 0.8fr);
  gap: 36px;
  align-items: center;
  padding: 70px clamp(20px, 6vw, 88px);
  background: var(--soft);
}

.scene-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.scene-list li {
  position: relative;
  padding-left: 28px;
}

.scene-list li::before {
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--warning);
  content: "";
}

.site-footer {
  padding: 60px clamp(20px, 6vw, 88px) 20px;
  color: #1f2937;
  background: var(--footer);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(5, minmax(120px, 1fr));
  gap: 42px;
  width: 100%;
  margin: 0;
  padding-top: 28px;
  padding-bottom: 24px;
  border-top: 1px solid #4a4a4a;
  border-bottom: 1px solid #696969;
}

.footer-links h2 {
  margin-bottom: 20px;
  color: #000000;
  font-size: 16px;
  font-weight: 800;
}

.footer-links a {
  display: block;
  margin-bottom: 10px;
  color: #1f2937;
  font-size: 14px;
}

.footer-meta {
  width: 100%;
  margin: 28px 0 0;
  color: #7a8291;
  font-size: 12px;
  line-height: 1.75;
}

.footer-meta p {
  margin-bottom: 0;
}

.footer-meta span {
  margin-left: 12px;
}

@media (max-width: 980px) {
  .hero,
  .scene-band {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .top-nav {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }

  .hero {
    min-height: auto;
    padding-top: 46px;
  }

  h1 {
    font-size: 46px;
  }

  .hero-lede {
    font-size: 17px;
  }

  .network-map {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 22px;
  }

  .link-line {
    width: 2px;
    height: 28px;
    justify-self: center;
    background: repeating-linear-gradient(180deg, #98b3e4 0 10px, transparent 10px 16px);
  }

  .status-grid,
  .feature-grid,
  .footer-links {
    grid-template-columns: 1fr;
  }

  .section,
  .scene-band {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .footer-meta span {
    display: block;
    margin-left: 0;
  }
}