:root {
  --ink: #101827;
  --muted: #5b6472;
  --line: #dbe4ee;
  --paper: #f5f8fb;
  --white: #ffffff;
  --accent: #18b86b;
  --accent-dark: #0f8a50;
  --blue: #1167d8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.6;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 72px;
  padding: 0 34px;
  color: #fff;
  background: rgba(16, 24, 39, .92);
  backdrop-filter: blur(16px);
  transition: box-shadow .25s ease, background .25s ease;
}

.site-header.is-scrolled {
  background: rgba(16, 24, 39, .98);
  box-shadow: 0 18px 45px rgba(15, 23, 42, .18);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 260px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--accent));
  font-size: 14px;
  font-weight: 800;
}

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

.brand strong {
  font-size: 18px;
  line-height: 1.2;
}

.brand small {
  color: #c8d3df;
  font-size: 12px;
}

.site-nav {
  display: flex;
  gap: 24px;
  margin-left: auto;
  color: #dbe4f0;
  font-size: 14px;
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover {
  color: #fff;
}

.header-cta,
.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  font-weight: 700;
  text-decoration: none;
  transition: transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
}

.header-cta,
.primary-btn {
  color: #07111f;
  background: var(--accent);
  border-color: var(--accent);
}

.header-cta:hover,
.primary-btn:hover {
  transform: translateY(-2px);
  color: #fff;
  background: var(--accent-dark);
}

.secondary-btn {
  color: #fff;
  border-color: rgba(255, 255, 255, .45);
}

.secondary-btn:hover {
  transform: translateY(-2px);
  border-color: #fff;
}

.hero {
  display: grid;
  grid-template-columns: minmax(320px, .82fr) minmax(520px, 1.18fr);
  gap: 48px;
  align-items: center;
  min-height: calc(100svh - 72px);
  padding: 58px 44px 70px;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(16, 24, 39, .98) 0%, rgba(16, 24, 39, .9) 42%, rgba(16, 24, 39, .74) 100%),
    radial-gradient(circle at 80% 12%, rgba(24, 184, 107, .22), transparent 34%),
    #101827;
  overflow: hidden;
}

.hero-copy {
  max-width: 640px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero h1 {
  margin: 0;
  font-size: 64px;
  line-height: 1.08;
  letter-spacing: 0;
}

.lead {
  margin: 22px 0 0;
  max-width: 560px;
  color: #dbe4f0;
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, .18);
  box-shadow: 0 28px 80px rgba(0, 0, 0, .38);
  transform: perspective(1200px) rotateY(-5deg) rotateX(2deg);
  transform-origin: center;
}

.overview,
.professional,
.workflow,
.screens,
.risk,
.parameters,
.manual,
.deployment,
.download,
.contact {
  padding: 82px 44px;
}

.overview,
.professional,
.screens,
.manual,
.contact {
  background: #fff;
}

.overview h2,
.professional h2,
.workflow h2,
.screens h2,
.risk h2,
.parameters h2,
.manual h2,
.deployment h2,
.download h2,
.contact h2 {
  max-width: 760px;
  margin: 0;
  font-size: 42px;
  line-height: 1.18;
  letter-spacing: 0;
}

.overview > p,
.prose p,
.workflow-copy p,
.risk-copy p,
.parameters > p,
.manual-copy p,
.deployment-text p,
.download p,
.contact-copy p {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.professional {
  border-top: 1px solid var(--line);
}

.prose {
  display: grid;
  gap: 12px;
  max-width: 980px;
  margin-top: 22px;
}

.prose p {
  max-width: none;
  margin: 0;
}

.spec-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 36px;
  background: var(--line);
  border: 1px solid var(--line);
}

.spec-columns div {
  padding: 26px;
  background: #f8fbfd;
}

.spec-columns h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.spec-columns p {
  margin: 0;
  color: var(--muted);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 42px;
  background: var(--line);
  border: 1px solid var(--line);
}

.metrics div {
  padding: 26px;
  background: #fff;
}

.metrics strong {
  display: block;
  font-size: 28px;
  line-height: 1.1;
}

.metrics span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.workflow {
  display: grid;
  grid-template-columns: .84fr 1.16fr;
  gap: 48px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.step {
  padding: 28px;
  background: #fff;
}

.step span {
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.step h3 {
  margin: 14px 0 8px;
  font-size: 22px;
}

.step p {
  margin: 0;
  color: var(--muted);
}

.screen-row {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  gap: 36px;
  align-items: center;
  margin-top: 38px;
}

.screen-row img,
.screen-grid img,
.risk-image img,
.manual-shot {
  border: 1px solid var(--line);
  box-shadow: 0 20px 48px rgba(16, 24, 39, .12);
}

.screen-row h3 {
  margin: 0 0 10px;
  font-size: 28px;
}

.screen-row p {
  margin: 0;
  color: var(--muted);
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 26px;
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.risk {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
  background: #eef4f8;
}

.risk-copy ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.risk-copy li {
  padding: 12px 14px;
  background: #fff;
  border-left: 4px solid var(--accent);
  font-weight: 700;
}

.parameters {
  background: #fff;
}

.param-table {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 36px;
  background: var(--line);
  border: 1px solid var(--line);
}

.param-table div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  padding: 22px;
  background: #f8fbfd;
}

.param-table strong {
  color: var(--ink);
  font-size: 17px;
}

.param-table span,
.param-note {
  color: var(--muted);
}

.param-note {
  max-width: 980px;
  margin-top: 28px;
  font-size: 16px;
}

.deployment {
  display: grid;
  grid-template-columns: .72fr 1.28fr;
  gap: 44px;
  background: #eef4f8;
}

.deployment-text p {
  max-width: 920px;
}

.manual {
  display: grid;
  grid-template-columns: .72fr 1.28fr;
  gap: 42px;
  align-items: center;
}

.download {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
  color: #fff;
  background: #101827;
}

.download p {
  color: #dbe4f0;
}

.primary-btn.dark {
  min-width: 180px;
}

.contact {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 44px;
}

dl {
  display: grid;
  gap: 10px;
  margin: 28px 0 0;
}

dl div {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

dt {
  color: var(--muted);
}

dd {
  margin: 0;
  font-weight: 700;
}

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

.qr-grid figure {
  padding: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.qr-grid img {
  aspect-ratio: 1 / 1;
  width: 100%;
  object-fit: cover;
  background: #fff;
}

.qr-grid figcaption {
  color: var(--ink);
  font-weight: 700;
  text-align: center;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 22px;
  padding: 26px 44px;
  color: #dbe4f0;
  background: #0c1220;
  font-size: 14px;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .65s ease, transform .65s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .site-header {
    flex-wrap: wrap;
    min-height: auto;
    padding: 14px 20px;
  }

  .brand {
    min-width: 0;
  }

  .site-nav {
    order: 3;
    width: 100%;
    gap: 18px;
    overflow-x: auto;
  }

  .hero,
  .workflow,
  .screen-row,
  .risk,
  .manual,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 48px 20px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero-visual img {
    transform: none;
  }

  .overview,
  .professional,
  .workflow,
  .screens,
  .risk,
  .parameters,
  .manual,
  .deployment,
  .download,
  .contact {
    padding: 58px 20px;
  }

  .overview h2,
  .professional h2,
  .workflow h2,
  .screens h2,
  .risk h2,
  .parameters h2,
  .manual h2,
  .deployment h2,
  .download h2,
  .contact h2 {
    font-size: 32px;
  }

  .metrics,
  .spec-columns,
  .steps,
  .param-table,
  .screen-grid,
  .qr-grid {
    grid-template-columns: 1fr;
  }

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

  .param-table div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

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

@media (max-width: 560px) {
  .header-cta {
    width: 100%;
  }

  .hero-actions {
    display: grid;
  }

  .primary-btn,
  .secondary-btn {
    width: 100%;
  }

  .risk-copy ul {
    grid-template-columns: 1fr;
  }

  dl div {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}