:root {
  --ink: #101923;
  --muted: #627083;
  --line: rgba(157, 174, 195, 0.28);
  --panel: #ffffff;
  --soft: #f4f8fb;
  --navy: #061827;
  --navy-2: #0c2841;
  --blue: #0f66b2;
  --cyan: #18c6df;
  --teal: #24b08d;
  --gold: #d7a84f;
  --shadow: 0 28px 70px rgba(8, 25, 42, 0.18);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #ffffff;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }

.site-header {
  position: fixed;
  z-index: 50;
  inset: 0 0 auto;
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto minmax(180px, 1fr);
  align-items: center;
  gap: 28px;
  min-height: 78px;
  padding: 14px clamp(22px, 5vw, 76px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(223, 230, 238, 0.72);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 290px;
}
.brand-logo {
  min-width: 330px;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}
.brand-logo img {
  display: block;
  width: clamp(188px, 18vw, 260px);
  height: auto;
}
.brand-subtitle {
  padding-left: 4px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(135deg, #0f66b2 0%, #18c6df 54%, #24b08d 100%);
  font-weight: 900;
  box-shadow: 0 12px 30px rgba(15, 102, 178, 0.26);
}
.brand strong,
.brand small { display: block; }
.brand strong { font-size: 17px; line-height: 1.2; }
.brand small { margin-top: 3px; color: var(--muted); font-size: 12px; }

.nav {
  display: flex;
  justify-content: center;
  gap: 8px;
  color: #263445;
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
  padding: 6px;
  border: 1px solid rgba(157, 174, 195, 0.26);
  border-radius: 999px;
  background: rgba(244, 248, 251, 0.82);
  box-shadow: 0 12px 30px rgba(8, 25, 42, 0.06);
}
.nav a {
  position: relative;
  padding: 9px 16px;
  border-radius: 999px;
  color: #17314a;
  transition: color .2s ease, background .2s ease, box-shadow .2s ease;
}
.nav a::after {
  content: none;
}
.nav a:hover {
  color: #052536;
  background: #fff;
  box-shadow: 0 8px 18px rgba(15, 102, 178, 0.12);
}

.header-call {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid rgba(15, 102, 178, 0.18);
  border-radius: 8px;
  color: #07345a;
  font-weight: 900;
  background: #fff;
  white-space: nowrap;
}

.hero {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  color: #fff;
  padding: 132px clamp(22px, 6vw, 88px) 64px;
}
.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
}
.hero-media {
  background: url("network-hero.png") center / cover no-repeat;
  transform: scale(1.035);
}
.hero-overlay {
  background:
    radial-gradient(circle at 72% 20%, rgba(24, 198, 223, .24), transparent 30%),
    linear-gradient(90deg, rgba(3, 16, 29, .95) 0%, rgba(6, 24, 39, .86) 43%, rgba(6, 24, 39, .45) 100%),
    linear-gradient(180deg, rgba(0,0,0,.10), rgba(0,0,0,.30));
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 170px;
  background: linear-gradient(180deg, transparent, #f4f8fb);
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, .66fr);
  gap: clamp(34px, 5vw, 76px);
  align-items: center;
  min-height: calc(100vh - 196px);
}
.hero-copy { max-width: 850px; }
.eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}
.hero .eyebrow { color: #7eefff; }
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin-bottom: 24px;
  font-size: clamp(42px, 5.6vw, 76px);
  line-height: 1.06;
  letter-spacing: 0;
}
h2 {
  margin-bottom: 16px;
  color: #092f52;
  font-size: clamp(30px, 3.25vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}
h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.34;
}
.hero-lead {
  max-width: 740px;
  margin-bottom: 32px;
  color: rgba(238, 247, 255, .9);
  font-size: 19px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 42px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  border-radius: 8px;
  font-weight: 900;
  transition: transform .2s ease, box-shadow .2s ease;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(0,0,0,.16);
}
.btn-primary { background: #fff; color: #07345a; }
.btn-secondary { background: var(--cyan); color: #052536; }
.btn-ghost {
  border: 1px solid rgba(255,255,255,.42);
  color: #fff;
  background: rgba(255,255,255,.08);
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(790px, 100%);
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 12px;
  background: rgba(8, 35, 55, .72);
  backdrop-filter: blur(14px);
}
.trust-strip div { padding: 20px 22px; }
.trust-strip dt { font-size: 27px; font-weight: 950; }
.trust-strip dd {
  margin: 4px 0 0;
  color: rgba(229, 241, 250, .78);
  font-size: 13px;
}

.ops-panel {
  position: relative;
  min-height: 550px;
  padding: 24px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 18px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.16), rgba(255,255,255,.06)),
    rgba(3, 18, 31, .66);
  box-shadow: 0 30px 80px rgba(0,0,0,.32);
  backdrop-filter: blur(18px);
}
.ops-panel::before {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 14px;
  border: 1px solid rgba(126, 239, 255, .12);
  pointer-events: none;
}
.panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(238, 247, 255, .86);
  font-size: 13px;
}
.panel-header strong {
  margin-left: auto;
  color: #92ffdf;
}
.pulse {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #27f1bf;
  box-shadow: 0 0 0 8px rgba(39, 241, 191, .12);
}
.network-map {
  position: relative;
  height: 300px;
  margin: 28px 0 18px;
  border-radius: 16px;
  background:
    linear-gradient(rgba(126,239,255,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126,239,255,.08) 1px, transparent 1px);
  background-size: 34px 34px;
  overflow: hidden;
}
.node {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 104px;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid rgba(126,239,255,.32);
  border-radius: 999px;
  background: rgba(4, 26, 42, .88);
  color: #eaf9ff;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 12px 26px rgba(0,0,0,.22);
}
.node-core { left: 50%; top: 46%; transform: translate(-50%, -50%); background: rgba(24,198,223,.24); }
.node-wifi { left: 8%; top: 16%; }
.node-iptv { right: 7%; top: 18%; }
.node-camera { left: 10%; bottom: 18%; }
.node-client { right: 8%; bottom: 16%; }
.line {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(126,239,255,.8), transparent);
  transform-origin: left center;
}
.line-a { width: 220px; left: 112px; top: 88px; transform: rotate(24deg); }
.line-b { width: 220px; right: 112px; top: 90px; transform: rotate(156deg); }
.line-c { width: 220px; left: 120px; bottom: 96px; transform: rotate(-24deg); }
.line-d { width: 220px; right: 116px; bottom: 92px; transform: rotate(204deg); }
.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.metric-grid div {
  padding: 14px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 12px;
  background: rgba(255,255,255,.08);
}
.metric-grid small {
  display: block;
  color: rgba(238,247,255,.62);
  font-size: 12px;
}
.metric-grid strong {
  display: block;
  margin-top: 4px;
  font-size: 18px;
}
.panel-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.panel-list span {
  padding: 7px 10px;
  border-radius: 999px;
  color: rgba(238,247,255,.82);
  background: rgba(255,255,255,.08);
  font-size: 12px;
}

.section {
  padding: 94px clamp(22px, 6vw, 88px);
}
.section-heading { max-width: 820px; }
.section-heading.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .58fr);
  gap: 44px;
  align-items: end;
  max-width: none;
}
.section-heading.split > p,
.intro-text,
.solution-card p,
.capability-copy p,
.process-list p,
.case-grid p,
.about p,
.contact p {
  color: var(--muted);
}

.intro {
  position: relative;
  z-index: 4;
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(300px, .68fr);
  gap: 50px;
  align-items: end;
  background: var(--soft);
}
.intro-text {
  margin-bottom: 0;
  font-size: 18px;
}

.solutions { background: #fff; }
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 38px;
}
.solution-card {
  position: relative;
  min-height: 260px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 1px 0 rgba(14,35,58,.04);
  overflow: hidden;
}
.solution-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--cyan), var(--teal));
  opacity: .75;
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  transition: .22s ease;
}
.solution-card.featured {
  grid-row: span 2;
  color: #fff;
  background:
    linear-gradient(160deg, rgba(15,102,178,.96), rgba(6,24,39,.96)),
    #0b2035;
}
.solution-card.featured p,
.solution-card.featured li { color: rgba(238,247,255,.82); }
.card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 34px;
  margin-bottom: 26px;
  border-radius: 8px;
  background: #e8f7fb;
  color: var(--blue);
  font-weight: 950;
}
.featured .card-index {
  background: rgba(255,255,255,.14);
  color: #7eefff;
}
.solution-card ul {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.solution-card li::before {
  content: "✓";
  margin-right: 8px;
  color: #7eefff;
}

.capability {
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(24,198,223,.22), transparent 32%),
    linear-gradient(135deg, #061827, #0c2841);
}
.capability h2 { color: #fff; }
.capability-layout {
  display: grid;
  grid-template-columns: minmax(280px, .54fr) minmax(0, 1fr);
  gap: 34px;
  margin-top: 34px;
}
.capability-copy {
  padding: 32px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 16px;
  background: rgba(255,255,255,.08);
}
.capability-copy p { color: rgba(238,247,255,.78); font-size: 18px; }
.assurance {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}
.assurance span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(126,239,255,.12);
  color: #c7f8ff;
  font-size: 13px;
}
.process-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.process-list li {
  min-height: 186px;
  padding: 26px;
  border: 1px solid rgba(255,255,255,.13);
  border-radius: 16px;
  background: rgba(255,255,255,.08);
}
.process-list span {
  display: block;
  margin-bottom: 18px;
  color: #7eefff;
  font-weight: 950;
}
.process-list strong {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
}
.process-list p { margin-bottom: 0; color: rgba(238,247,255,.72); }

.cases { background: var(--soft); }
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
}
.case-grid article {
  min-height: 240px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background:
    linear-gradient(180deg, rgba(255,255,255,.96), rgba(255,255,255,.88)),
    #fff;
}
.case-grid small {
  display: block;
  margin-bottom: 52px;
  color: var(--cyan);
  font-weight: 900;
  text-transform: uppercase;
}

.about { background: #fff; }
.about-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, .6fr);
  gap: 44px;
  align-items: center;
  padding: 44px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(135deg, rgba(15,102,178,.08), rgba(36,176,141,.08)),
    #fff;
}
.about-facts { display: grid; gap: 14px; }
.about-facts div {
  padding: 18px;
  border: 1px solid rgba(157,174,195,.28);
  border-radius: 12px;
  background: rgba(255,255,255,.78);
}
.about-facts strong,
.about-facts span { display: block; }
.about-facts strong { color: #092f52; }
.about-facts span { margin-top: 4px; color: var(--muted); font-size: 14px; }

.contact {
  color: #fff;
  background:
    linear-gradient(135deg, rgba(15,102,178,.92), rgba(6,24,39,.96)),
    var(--navy);
}
.contact h2 { color: #fff; }
.contact-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 440px);
  gap: 36px;
  align-items: center;
}
.contact p { color: rgba(238,247,255,.78); }
.contact-card {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 32px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 16px;
  background: rgba(255,255,255,.10);
  font-style: normal;
}
.contact-card a,
.contact-card span { color: rgba(255,255,255,.92); }

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 18px;
  padding: 28px 20px;
  color: #d6dde6;
  background: #06121e;
  font-size: 14px;
}
.site-footer p { margin: 0; }
.site-footer a { color: #7eefff; }
.footer-brand {
  flex-basis: 100%;
  display: flex;
  justify-content: center;
  margin-bottom: 4px;
}
.footer-brand img {
  width: 168px;
  height: auto;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(255,255,255,.92);
}

@media (max-width: 1120px) {
  .hero-grid,
  .intro,
  .section-heading.split,
  .capability-layout,
  .about-panel,
  .contact-content {
    grid-template-columns: 1fr;
  }
  .ops-panel { max-width: 620px; }
  .solution-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 780px) {
  .site-header {
    position: absolute;
    align-items: flex-start;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .brand { min-width: 0; }
  .brand-logo {
    min-width: 0;
    max-width: 260px;
  }
  .brand-logo img {
    width: 206px;
  }
  .nav {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 8px;
    border-radius: 14px;
    padding: 6px;
  }
  .header-call { display: none; }
  .hero { padding-top: 192px; }
  .hero-grid { min-height: 0; }
  h1 { font-size: 39px; }
  .hero-lead { font-size: 17px; }
  .hero-actions,
  .btn { width: 100%; }
  .trust-strip,
  .solution-grid,
  .process-list,
  .case-grid {
    grid-template-columns: 1fr;
  }
  .ops-panel { min-height: auto; padding: 18px; }
  .network-map { height: 260px; }
  .metric-grid { grid-template-columns: 1fr; }
  .section { padding-top: 68px; padding-bottom: 68px; }
}