:root {
  --ink: #17212b;
  --muted: #607080;
  --line: #dde6ee;
  --paper: #f5f8fb;
  --white: #ffffff;
  --green: #008fe8;
  --green-dark: #006fb8;
  --green-soft: #e8f6fd;
  --lime: #18c7ff;
  --steel: #3f4e5a;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 76px;
  padding: 12px clamp(20px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand img {
  display: block;
  width: 228px;
  height: auto;
}

nav {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 3vw, 42px);
  color: var(--steel);
  font-size: 15px;
  font-weight: 700;
}

nav a,
.header-action {
  transition: color 0.18s ease, background 0.18s ease;
}

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

.header-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  color: var(--white);
  background: var(--green);
  font-weight: 800;
}

.header-action:hover,
.button.primary:hover {
  background: var(--green-dark);
}

.hero {
  position: relative;
  min-height: 620px;
  overflow: hidden;
  background: #101820;
}

.hero > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% center;
}

.hero::after {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(90deg, rgba(5, 13, 20, 0.78), rgba(5, 13, 20, 0.22) 62%, rgba(5, 13, 20, 0.08));
}

.hero-panel {
  position: relative;
  z-index: 1;
  width: min(690px, calc(100% - 40px));
  margin-left: clamp(20px, 6vw, 82px);
  padding-top: 104px;
  color: var(--white);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

.hero .eyebrow,
.contact .eyebrow {
  color: #61d7ff;
}

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

h1 {
  max-width: 680px;
  margin-bottom: 22px;
  font-size: clamp(42px, 6vw, 70px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 4vw, 43px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.3;
}

.hero-copy {
  max-width: 610px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  font-weight: 800;
}

.button.primary {
  color: var(--white);
  background: var(--green);
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.08);
}

.quick-help {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  width: min(1160px, calc(100% - 40px));
  margin: -62px auto 0;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: 0 18px 42px rgba(24, 36, 48, 0.12);
}

.quick-help a {
  min-height: 124px;
  padding: 24px;
  border-right: 1px solid var(--line);
}

.quick-help a:last-child {
  border-right: 0;
}

.quick-help strong,
.quick-help span {
  display: block;
}

.quick-help strong {
  margin-bottom: 10px;
  color: var(--green);
  font-size: 20px;
}

.quick-help span {
  color: var(--muted);
  font-size: 14px;
}

.section {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 82px 0;
}

.intro {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(300px, 1.1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.intro > p {
  margin: 35px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.section-heading {
  max-width: 680px;
}

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

.product-grid,
.solution-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.product-grid article,
.solution-grid article,
.case-list article {
  min-height: 238px;
  padding: 24px;
  border: 1px solid var(--line);
  background: var(--white);
}

.product-grid span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 34px;
  margin-bottom: 34px;
  color: var(--green);
  background: var(--green-soft);
  font-weight: 900;
}

.product-grid p,
.solution-grid p,
.case-list p,
.support-list p {
  color: var(--muted);
}

.solution-grid article {
  border-top: 4px solid var(--green);
}

.support-band {
  background: #eaf4fa;
  border-block: 1px solid var(--line);
}

.support-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(360px, 1.18fr);
  gap: clamp(28px, 5vw, 72px);
}

.support-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 36px;
}

.support-list div {
  padding-top: 20px;
  border-top: 3px solid var(--lime);
}

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

.case-list article {
  min-height: 214px;
}

.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto 70px;
  padding: clamp(28px, 5vw, 48px);
  color: var(--white);
  background: #101820;
}

.contact h2 {
  max-width: 760px;
}

.contact p:not(.eyebrow) {
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.78);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px clamp(20px, 5vw, 64px);
  color: #75818d;
  border-top: 1px solid var(--line);
  background: var(--white);
  font-size: 14px;
}

footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  nav {
    display: none;
  }

  .brand img {
    width: 206px;
  }

  .hero {
    min-height: 560px;
  }

  .hero-panel {
    width: calc(100% - 32px);
    margin-inline: 16px;
    padding-top: 76px;
  }

  .quick-help,
  .intro,
  .product-grid,
  .solution-grid,
  .support-layout,
  .case-list {
    grid-template-columns: 1fr;
  }

  .quick-help {
    margin-top: 0;
    width: 100%;
    box-shadow: none;
  }

  .quick-help a {
    min-height: 96px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .intro > p {
    margin-top: 0;
  }

  .product-grid article,
  .solution-grid article,
  .case-list article {
    min-height: auto;
  }

  .support-list {
    grid-template-columns: 1fr;
  }

  .contact {
    align-items: stretch;
    flex-direction: column;
  }

  .contact .button {
    width: 100%;
  }

  footer {
    flex-direction: column;
  }
}

@media (max-width: 540px) {
  .site-header {
    padding-inline: 16px;
  }

  .header-action {
    min-height: 38px;
    padding-inline: 12px;
    font-size: 14px;
  }

  .brand img {
    width: 176px;
  }

  h1 {
    font-size: 39px;
  }

  .hero-copy,
  .intro > p {
    font-size: 17px;
  }

  .section {
    width: calc(100% - 32px);
    padding: 60px 0;
  }

  .contact {
    width: calc(100% - 32px);
    margin-bottom: 44px;
  }
}