:root {
  --primary: #1a73e8;
  --primary-light: #e8f0fe;
  --accent: #f9ab00;
  --hero-bg: #141827;
  --text: #17191f;
  --muted: #5d6470;
  --subtle: #f6f7f9;
  --surface: #ffffff;
  --line: #e4e7ec;
  --max: 1200px;
  --shadow: 0 18px 50px rgba(18, 24, 40, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: #ffffff;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.65;
}

body.nav-open {
  overflow: hidden;
}

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

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

.container {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(228, 231, 236, 0.9);
  backdrop-filter: blur(14px);
}

.nav-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  gap: 14px;
  font-weight: 700;
}

.brand-logo {
  width: 172px;
  height: 42px;
  flex: 0 0 auto;
  object-fit: contain;
  object-position: left center;
}

.brand-text {
  display: grid;
  line-height: 1.25;
}

.brand-name {
  font-size: 17px;
}

.brand-site {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

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

.nav-links a {
  padding: 10px 12px;
  color: #333842;
  font-size: 14px;
  border-radius: 6px;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--primary);
  background: var(--primary-light);
  outline: none;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  cursor: pointer;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  margin: 3px 0;
  background: var(--text);
  display: block;
}

.hero {
  position: relative;
  min-height: 74vh;
  padding: 138px 0 82px;
  color: #ffffff;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.18), transparent 28%),
    linear-gradient(120deg, var(--hero-bg), #101828 64%, #0b1220);
}

.hero.has-image::after {
  content: "";
  position: absolute;
  inset: 80px 0 0 auto;
  width: min(54vw, 680px);
  background-image: var(--hero-image);
  background-position: right 7vw center;
  background-repeat: no-repeat;
  background-size: contain;
  opacity: 0.34;
  filter: saturate(1.04);
}

.hero::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 7px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(680px, 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 15px;
}

.hero h1 {
  margin: 0;
  font-size: 50px;
  line-height: 1.16;
  letter-spacing: 0;
}

.hero-lead {
  margin: 24px 0 0;
  max-width: 620px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 700;
  line-height: 1;
}

.button.primary {
  color: #151515;
  background: var(--accent);
}

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

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 44px;
}

.stat {
  min-width: 126px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
}

.stat strong {
  display: block;
  font-size: 28px;
  line-height: 1;
}

.stat span {
  display: block;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

main {
  overflow: hidden;
}

.section {
  padding: 78px 0;
}

.section.subtle {
  background: var(--subtle);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

.section h2 {
  margin: 0;
  font-size: 32px;
  line-height: 1.25;
  letter-spacing: 0;
}

.section-summary {
  margin: 0;
  max-width: 520px;
  color: var(--muted);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.product-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 10px 28px rgba(18, 24, 40, 0.06);
}

.product-media {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  padding: 18px;
  background: linear-gradient(180deg, #ffffff, var(--primary-light));
}

.product-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.image-placeholder {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  color: var(--primary);
  border: 1px dashed rgba(0, 0, 0, 0.18);
  border-radius: 8px;
  font-weight: 700;
}

.product-body {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  padding: 20px;
}

.product-card h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: 0;
}

.sku {
  margin: 8px 0 0;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

.description {
  margin: 14px 0 0;
  color: #3c424d;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.spec-list {
  margin: 18px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.spec-list li {
  position: relative;
  padding-left: 16px;
  color: var(--muted);
  font-size: 14px;
}

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

.spec-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-item {
  min-height: 128px;
  padding: 22px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.feature-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  color: #ffffff;
  background: var(--primary);
  border-radius: 8px;
  font-weight: 800;
}

.feature-item h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.35;
}

.feature-item p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

summary {
  cursor: pointer;
  padding: 20px 22px;
  color: #20242c;
  font-weight: 700;
}

details p {
  margin: 0;
  padding: 0 22px 22px;
  color: var(--muted);
}

.contact-band {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 34px;
  align-items: stretch;
  padding: 34px;
  color: #ffffff;
  background: linear-gradient(125deg, var(--hero-bg), var(--primary));
  border-radius: 8px;
}

.contact-band h2 {
  margin: 0;
}

.contact-band p {
  color: rgba(255, 255, 255, 0.8);
}

.contact-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.contact-list strong {
  min-width: 58px;
  color: rgba(255, 255, 255, 0.72);
}

.site-footer {
  padding: 30px 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

[data-reveal] {
  transform: translateY(16px);
  opacity: 0;
  transition: transform 500ms ease, opacity 500ms ease;
}

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

@media (max-width: 1023px) {
  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (max-width: 767px) {
  .container {
    width: min(100% - 28px, var(--max));
  }

  .nav-toggle {
    display: grid;
  }

  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  body.nav-open .nav-links {
    display: flex;
  }

  .nav-links a {
    padding: 14px;
  }

  .brand-logo {
    width: 136px;
    height: 34px;
  }

  .brand-site {
    font-size: 12px;
  }

  .hero {
    min-height: 70vh;
    padding: 116px 0 58px;
  }

  .hero.has-image::after {
    inset: auto -40px -18px auto;
    width: 82vw;
    height: 50%;
    background-position: right bottom;
    opacity: 0.2;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-stats {
    gap: 14px;
  }

  .stat {
    min-width: calc(50% - 8px);
  }

  .section {
    padding: 56px 0;
  }

  .section-heading {
    display: block;
  }

  .section h2 {
    font-size: 27px;
  }

  .section-summary {
    margin-top: 12px;
  }

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

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

  .feature-item {
    min-height: 118px;
    padding: 18px;
  }

  .contact-band {
    grid-template-columns: 1fr;
    padding: 24px;
  }
}

@media (max-width: 420px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions .button {
    width: 100%;
  }
}