:root {
  --bg: #061019;
  --bg-soft: #0b1824;
  --panel: rgba(9, 24, 36, 0.78);
  --panel-solid: #0f202e;
  --text: #eef8ff;
  --muted: #9fb8c9;
  --line: rgba(139, 218, 255, 0.18);
  --cyan: #20d4ff;
  --blue: #2f7dff;
  --green: #36e0a1;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
  padding-bottom: 72px;
}

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

.network-canvas {
  position: fixed;
  inset: 0;
  z-index: -3;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 18% 18%, rgba(32, 212, 255, 0.16), transparent 28%),
    radial-gradient(circle at 82% 8%, rgba(54, 224, 161, 0.12), transparent 30%),
    linear-gradient(135deg, #061019 0%, #071620 52%, #07111a 100%);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 14px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(6, 16, 25, 0.72);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(32, 212, 255, 0.45);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(32, 212, 255, 0.2), rgba(54, 224, 161, 0.13));
  box-shadow: 0 0 26px rgba(32, 212, 255, 0.25);
  color: var(--white);
  font-weight: 900;
}

.brand strong {
  display: block;
  font-size: 16px;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.18em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  border-radius: 8px;
  color: #c9dfec;
  font-size: 15px;
  padding: 9px 14px;
  transition: background 180ms ease, color 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: rgba(32, 212, 255, 0.12);
  color: var(--white);
  outline: none;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
}

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 84vh;
  overflow: hidden;
  padding: 126px clamp(20px, 6vw, 86px) 92px;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: url("assets/hero-tech.png");
  background-position: center;
  background-size: cover;
  opacity: 0.7;
  transform: scale(1.02);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(6, 16, 25, 0.96) 0%, rgba(6, 16, 25, 0.68) 47%, rgba(6, 16, 25, 0.1) 100%),
    linear-gradient(0deg, #061019 0%, rgba(6, 16, 25, 0.1) 24%, rgba(6, 16, 25, 0.18) 100%);
}

.hero-content {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(42px, 6vw, 74px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.hero-copy {
  max-width: 660px;
  color: #d6e8f4;
  font-size: clamp(17px, 1.6vw, 20px);
}

.hero-actions,
.contact-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border-radius: 8px;
  font-weight: 700;
  padding: 11px 20px;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.btn.primary {
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #03101a;
  box-shadow: 0 12px 34px rgba(32, 212, 255, 0.27);
}

.btn.ghost {
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.hero-stats {
  position: absolute;
  right: clamp(20px, 6vw, 86px);
  bottom: 34px;
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 12px;
  width: min(520px, calc(100% - 40px));
}

.hero-stats article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(7, 20, 30, 0.62);
  padding: 14px 16px;
  backdrop-filter: blur(14px);
}

.hero-stats strong {
  display: block;
  color: var(--cyan);
  font-size: 24px;
  line-height: 1;
}

.hero-stats span {
  color: #c8dce8;
  font-size: 14px;
}

.section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 84px 0;
}

.intro {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(280px, 1.1fr);
  gap: clamp(24px, 5vw, 70px);
  align-items: start;
  border-bottom: 1px solid var(--line);
}

.intro p:last-child,
.solution-panel p,
.contact-box p,
.service-card p,
.timeline p {
  color: var(--muted);
}

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

.service-card {
  min-height: 260px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.025)),
    var(--panel);
  box-shadow: var(--shadow);
  padding: 24px;
}

.card-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 28px;
  border: 1px solid rgba(54, 224, 161, 0.35);
  border-radius: 8px;
  color: var(--green);
  background: rgba(54, 224, 161, 0.08);
  font-size: 20px;
}

.solutions {
  width: 100%;
  max-width: none;
  padding: 82px clamp(20px, 6vw, 86px);
  border-block: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(135deg, rgba(32, 212, 255, 0.1), transparent 40%),
    rgba(5, 14, 22, 0.7);
}

.solution-panel {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(280px, 1.1fr);
  gap: clamp(24px, 5vw, 70px);
  width: min(1180px, 100%);
  margin: 0 auto;
  align-items: center;
}

.module-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.module-list span {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  padding: 15px 16px;
  color: #dcecf6;
}

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

.timeline article {
  position: relative;
  min-height: 210px;
  border-top: 2px solid rgba(32, 212, 255, 0.5);
  padding: 24px 8px 0;
}

.timeline span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 22px;
  border-radius: 50%;
  background: var(--cyan);
  color: #061019;
  font-weight: 900;
}

.contact {
  padding-top: 24px;
}

.contact-box {
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(32, 212, 255, 0.12), rgba(54, 224, 161, 0.08)),
    var(--panel-solid);
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 46px);
}

.contact-box > div {
  max-width: 740px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 22px;
  padding: 34px 20px 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.site-footer strong {
  color: var(--text);
}

.beian-link,
.beian-float {
  color: var(--text);
  font-weight: 700;
}

.beian-link {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.beian-float {
  position: fixed;
  left: 50%;
  bottom: 16px;
  z-index: 30;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  width: min(420px, calc(100% - 32px));
  border: 1px solid rgba(32, 212, 255, 0.42);
  border-radius: 8px;
  background: rgba(5, 14, 22, 0.92);
  box-shadow: 0 10px 38px rgba(0, 0, 0, 0.38), 0 0 28px rgba(32, 212, 255, 0.18);
  backdrop-filter: blur(16px);
  padding: 10px 18px;
  text-align: center;
}

.beian-float:hover,
.beian-float:focus-visible {
  border-color: rgba(54, 224, 161, 0.72);
  outline: none;
}

@media (max-width: 960px) {
  .menu-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: 76px;
    left: 20px;
    right: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(6, 16, 25, 0.96);
    padding: 8px;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 12px;
  }

  .intro,
  .solution-panel {
    grid-template-columns: 1fr;
  }

  .service-grid,
  .timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-stats {
    position: static;
    margin-top: 42px;
  }
}

@media (max-width: 640px) {
  body {
    padding-bottom: 86px;
  }

  .site-header {
    min-height: 70px;
    padding-inline: 16px;
  }

  .brand strong {
    max-width: 220px;
    white-space: normal;
    line-height: 1.25;
  }

  .brand small {
    display: none;
  }

  .site-nav {
    top: 70px;
    left: 16px;
    right: 16px;
  }

  .hero {
    min-height: 0;
    padding: 112px 20px 58px;
  }

  h1 {
    font-size: 40px;
  }

  .hero-stats,
  .service-grid,
  .timeline,
  .module-list {
    grid-template-columns: 1fr;
  }

  .section {
    width: min(100% - 32px, 1180px);
    padding: 62px 0;
  }

  .service-card,
  .timeline article {
    min-height: 0;
  }
}