:root {
  --ink: #111827;
  --muted: #5d6678;
  --line: #dce3ea;
  --paper: #ffffff;
  --soft: #f4f8fb;
  --deep: #0f172a;
  --teal: #0f9f7f;
  --blue: #2f6fed;
  --amber: #f2b84b;
  --shadow: 0 18px 46px rgba(17, 24, 39, 0.12);
  --radius: 8px;
  --content: min(1120px, calc(100vw - 40px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial,
    sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.is-menu-open {
  overflow: hidden;
}

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

img,
svg {
  display: block;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: var(--content);
  min-height: 72px;
  margin: 0 auto;
  color: #ffffff;
  transition:
    color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease,
    width 180ms ease,
    border-color 180ms ease;
}

.site-header.is-scrolled,
.site-header.is-menu-open {
  top: 12px;
  width: min(1120px, calc(100vw - 24px));
  min-height: 64px;
  padding: 0 16px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(220, 227, 234, 0.9);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand img {
  width: 40px;
  height: 40px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 17px;
  line-height: 1.1;
  font-weight: 700;
}

.brand small {
  margin-top: 2px;
  color: currentColor;
  font-size: 11px;
  line-height: 1;
  opacity: 0.72;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 600;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
}

.site-nav a::after {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: var(--amber);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  color: currentColor;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  background: currentColor;
  border-radius: 999px;
  transition:
    transform 160ms ease,
    opacity 160ms ease;
}

.menu-button[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-button[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-button[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  min-height: 720px;
  color: #ffffff;
  background:
    linear-gradient(90deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.82) 42%, rgba(15, 23, 42, 0.38) 100%),
    url("/assets/hero-network.svg") center / cover no-repeat,
    #0f172a;
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 56px;
  align-items: end;
  width: var(--content);
  min-height: 720px;
  margin: 0 auto;
  padding: 128px 0 74px;
}

.hero__copy {
  max-width: 760px;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 7vw, 78px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.hero p {
  max-width: 640px;
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.85;
  overflow-wrap: anywhere;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease,
    border-color 160ms ease;
}

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

.button--primary {
  color: #111827;
  background: var(--amber);
  box-shadow: 0 14px 28px rgba(242, 184, 75, 0.24);
}

.button--secondary {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.08);
}

.button--light {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.08);
}

.hero__facts {
  display: grid;
  gap: 0;
  margin: 0;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(16px);
}

.hero__facts div {
  padding: 20px 22px;
}

.hero__facts div + div {
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.hero__facts dt {
  margin: 0 0 6px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 13px;
  font-weight: 600;
}

.hero__facts dd {
  margin: 0;
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
}

.section {
  padding: 92px 0;
}

.section--intro {
  padding: 52px 0;
  background: var(--soft);
}

.section__inner {
  width: var(--content);
  margin: 0 auto;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.intro-grid h2,
.section-heading h2,
.contact-section h2 {
  margin: 0;
  font-size: clamp(29px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0;
}

.intro-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.section-heading {
  max-width: 680px;
  margin: 0 auto 42px;
  text-align: center;
}

.section-heading--left {
  max-width: 420px;
  margin: 0;
  text-align: left;
}

.section-heading p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.service-card {
  min-height: 286px;
  padding: 26px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.service-card:hover {
  border-color: rgba(15, 159, 127, 0.48);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.service-card__icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  color: var(--teal);
  background: rgba(15, 159, 127, 0.1);
  border-radius: var(--radius);
}

.service-card__icon svg {
  width: 25px;
  height: 25px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.service-card h3,
.solution-item h3,
.timeline h3 {
  margin: 22px 0 10px;
  font-size: 20px;
  line-height: 1.25;
}

.service-card p,
.solution-item p,
.timeline p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.section--contrast {
  overflow: hidden;
  color: #ffffff;
  background:
    radial-gradient(circle at 82% 22%, rgba(15, 159, 127, 0.28), transparent 34%),
    linear-gradient(135deg, #101827 0%, #192338 58%, #10251f 100%);
}

.section--contrast .section-heading p,
.section--contrast .solution-item p {
  color: rgba(255, 255, 255, 0.7);
}

.solution-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 70px;
  align-items: start;
}

.solution-list {
  display: grid;
  gap: 16px;
}

.solution-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 22px;
  padding: 26px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.solution-item:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.solution-item span {
  color: var(--amber);
  font-size: 14px;
  font-weight: 800;
}

.solution-item h3 {
  margin-top: 0;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.timeline article {
  min-height: 230px;
  padding: 32px 26px;
}

.timeline article + article {
  border-left: 1px solid var(--line);
}

.timeline span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: #ffffff;
  background: var(--blue);
  border-radius: 50%;
  font-size: 14px;
  font-weight: 800;
}

.contact-section {
  padding: 78px 0;
  color: #ffffff;
  background:
    linear-gradient(120deg, rgba(15, 23, 42, 0.92), rgba(15, 159, 127, 0.72)),
    url("/assets/hero-network.svg") center / cover no-repeat;
}

.contact-section__inner {
  display: flex;
  gap: 28px;
  align-items: center;
  justify-content: space-between;
  width: var(--content);
  margin: 0 auto;
}

.contact-section p {
  max-width: 720px;
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 17px;
}

.site-footer {
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  width: var(--content);
  min-height: 84px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 14px;
}

.site-footer strong,
.site-footer span {
  display: block;
}

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

.site-footer a {
  color: var(--muted);
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--blue);
}

@media (max-width: 980px) {
  .hero,
  .hero__inner {
    min-height: 680px;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .hero__facts div + div {
    border-top: 0;
    border-left: 1px solid rgba(255, 255, 255, 0.16);
  }

  .intro-grid,
  .solution-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .timeline article:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .timeline article:nth-child(4) {
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 720px) {
  :root {
    --content: min(calc(100vw - 28px), 1120px);
  }

  .site-header {
    min-height: 64px;
  }

  .site-header.is-scrolled,
  .site-header.is-menu-open {
    top: 8px;
    width: calc(100vw - 16px);
    padding: 0 12px;
  }

  .brand small {
    display: none;
  }

  .menu-button {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    top: 82px;
    left: 8px;
    right: 8px;
    display: grid;
    gap: 0;
    padding: 10px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition:
      opacity 160ms ease,
      transform 160ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 14px 10px;
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    min-height: 720px;
    background:
      linear-gradient(180deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.74) 62%, rgba(15, 23, 42, 0.52) 100%),
      url("/assets/hero-network.svg") center / cover no-repeat,
      #0f172a;
  }

  .hero__inner {
    min-height: 720px;
    padding: 110px 0 44px;
  }

  .hero h1 {
    font-size: clamp(34px, 10.6vw, 42px);
    line-height: 1.12;
  }

  .hero p {
    font-size: 16px;
    max-width: 100%;
    word-break: break-all;
    overflow-wrap: anywhere;
  }

  .hero__actions {
    width: 100%;
  }

  .button {
    width: 100%;
  }

  .hero__facts {
    grid-template-columns: 1fr;
  }

  .hero__facts div + div {
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    border-left: 0;
  }

  .section {
    padding: 68px 0;
  }

  .section--intro {
    padding: 42px 0;
  }

  .section-heading {
    margin-bottom: 30px;
    text-align: left;
  }

  .service-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: 0;
  }

  .timeline {
    border-bottom: 0;
  }

  .timeline article {
    min-height: 0;
    padding: 28px 0;
  }

  .timeline article + article,
  .timeline article:nth-child(3),
  .timeline article:nth-child(4) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .solution-item {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 14px;
  }

  .contact-section__inner,
  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer {
    padding: 24px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}