:root {
  --brand: #007a67;
  --brand-dark: #004d43;
  --blue: #0b5c8e;
  --amber: #ffb32c;
  --ink: #102321;
  --muted: #63716f;
  --line: #dce8e5;
  --soft: #eef7f5;
  --paper: #ffffff;
  --section: #f7fbfa;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
}

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

.wrap {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--brand-dark);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background:
    linear-gradient(90deg, transparent 12px, var(--amber) 12px, var(--amber) 18px, transparent 18px),
    linear-gradient(135deg, var(--brand), var(--blue));
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, .28);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 15px;
}

.nav-links a {
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--brand);
  border-color: var(--brand);
}

.hero {
  min-height: 520px;
  background-size: cover;
  background-position: center;
  color: #fff;
  display: flex;
  align-items: center;
}

.hero-inner {
  padding: 86px 0 72px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--amber);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 18px;
  font-size: 58px;
  line-height: 1.1;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: 32px;
  line-height: 1.24;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.35;
}

.lead {
  max-width: 720px;
  color: rgba(255, 255, 255, .9);
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 800;
}

.button.primary {
  color: #fff;
  background: var(--brand);
}

.button.light {
  color: #fff;
  border-color: rgba(255, 255, 255, .55);
  background: rgba(255, 255, 255, .08);
}

.button.secondary {
  color: var(--brand);
  background: #fff;
  border-color: var(--line);
}

.button.full {
  width: 100%;
  margin-top: 12px;
}

.hero-note {
  color: rgba(255, 255, 255, .82);
  font-size: 14px;
}

.section {
  padding: 64px 0;
}

.section.alt {
  background: var(--section);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.two-col {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 36px;
  align-items: start;
}

.info-panel,
.download-box,
.model-card,
.feature-grid article,
.article,
.notice-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

.info-panel {
  background: var(--soft);
}

.facts {
  margin: 0;
}

.facts div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(0, 122, 103, .12);
}

.facts div:last-child {
  border-bottom: 0;
}

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

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

.inline-facts {
  margin-top: 18px;
}

.text-dark {
  color: var(--ink);
}

.faq-list details {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

.faq-list details:first-child {
  border-top: 0;
}

.faq-list summary {
  cursor: pointer;
  color: var(--brand-dark);
  font-weight: 800;
}

.faq-list p {
  margin: 10px 0 0;
}

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

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

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

.product-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 24px;
  align-items: center;
}

.product-image {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.model-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.model-card span,
.muted,
.site-footer p,
.article p,
.article li {
  color: var(--muted);
}

.check-list {
  margin: 0;
  padding-left: 20px;
}

.check-list li + li {
  margin-top: 8px;
}

.download-box {
  border-left: 5px solid var(--brand);
}

.contact-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.contact-strip div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: var(--soft);
}

.contact-strip span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.contact-strip strong {
  display: block;
  margin-top: 6px;
  font-size: 19px;
}

.page-title {
  padding: 56px 0;
  background: var(--section);
  border-bottom: 1px solid var(--line);
}

.page-title h1 {
  margin-bottom: 10px;
  color: var(--brand-dark);
  font-size: 42px;
}

.content-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
}

.side-nav {
  position: sticky;
  top: 90px;
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}

.side-nav a {
  display: block;
  padding: 13px 16px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.side-nav a:last-child {
  border-bottom: 0;
}

.side-nav a:hover {
  color: var(--brand);
  background: var(--soft);
}

.article + .article {
  margin-top: 18px;
}

.article h2 {
  font-size: 26px;
}

.steps {
  counter-reset: step;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.steps li:before {
  content: counter(step);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--brand);
  font-weight: 800;
}

.site-footer {
  padding: 34px 0;
  color: #d7e9e6;
  background: #102321;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr .8fr 1.2fr;
  gap: 24px;
}

.footer-links,
.beian {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a,
.beian a {
  color: #d7e9e6;
}

.police-beian {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.police-beian img {
  width: 16px;
  height: 16px;
}

@media (max-width: 840px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 10px 14px;
  }

  .hero {
    min-height: 480px;
  }

  .hero-inner {
    padding: 64px 0 54px;
  }

  h1 {
    font-size: 40px;
  }

  .two-col,
  .content-grid,
  .footer-grid,
  .contact-strip,
  .product-layout,
  .model-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: static;
  }
}