:root {
  --bg: #ffffff;
  --bg-soft: #f5f8fb;
  --bg-line: #eef3f7;
  --ink: #102033;
  --muted: #5f7288;
  --soft-text: #7b8ca1;
  --blue: #155d9f;
  --blue-dark: #0f4678;
  --teal: #0f9a91;
  --teal-soft: #e9f7f5;
  --amber: #b7791f;
  --border: #dce6ef;
  --shadow: 0 20px 50px rgba(14, 40, 68, 0.14);
  --radius: 8px;
  --max: 1180px;
  color: var(--ink);
  font-family: Inter, "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.65;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(220, 230, 239, 0.86);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 8px;
  background: var(--blue-dark);
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
  white-space: nowrap;
}

.brand strong {
  font-size: 15px;
  line-height: 1.25;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #304459;
  font-size: 14px;
  font-weight: 650;
}

.site-nav a {
  position: relative;
  padding: 24px 0;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 17px;
  left: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--teal);
  content: "";
  opacity: 0;
  transform: translateY(4px);
  transition: 0.2s ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 3px auto;
  border-radius: 2px;
  background: var(--ink);
}

.section-band {
  background:
    linear-gradient(180deg, rgba(245, 248, 251, 0.94), rgba(255, 255, 255, 0.98)),
    repeating-linear-gradient(90deg, transparent 0, transparent 47px, rgba(21, 93, 159, 0.035) 48px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 48px;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: 74px max(24px, calc((100vw - var(--max)) / 2)) 64px;
  overflow: hidden;
}

.hero-copy {
  max-width: 560px;
}

.hero h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(34px, 4.2vw, 58px);
  font-weight: 800;
  line-height: 1.08;
}

.hero p {
  margin: 24px 0 0;
  color: #3f5267;
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 750;
  line-height: 1;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

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

.button.primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 12px 26px rgba(21, 93, 159, 0.24);
}

.button.primary:hover {
  background: var(--blue-dark);
}

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

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 38px 0 0;
}

.hero-facts div {
  min-width: 0;
  padding: 16px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
}

.hero-facts dt {
  color: var(--blue-dark);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.2;
}

.hero-facts dd {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.hero-media {
  position: relative;
}

.hero-media::before {
  position: absolute;
  inset: -18px 20px auto auto;
  width: 210px;
  height: 210px;
  border: 1px solid rgba(15, 154, 145, 0.22);
  border-radius: 50%;
  content: "";
  opacity: 0.5;
}

.hero-media img {
  position: relative;
  width: min(760px, 64vw);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.product-section,
.service-section,
.research-section,
.contact-section {
  padding: 86px max(24px, calc((100vw - var(--max)) / 2));
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 38px;
  text-align: center;
}

.section-heading.align-left {
  max-width: 680px;
  margin-right: 0;
  margin-left: 0;
  text-align: left;
}

.section-heading h2,
.research-copy h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 800;
  line-height: 1.18;
}

.section-heading p,
.research-copy p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-item {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(28, 54, 83, 0.06);
}

.feature-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  background: #eaf3fb;
  color: var(--blue);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.9;
}

.feature-item:nth-child(2) .feature-icon {
  background: var(--teal-soft);
  color: var(--teal);
}

.feature-item:nth-child(3) .feature-icon {
  background: #fff5e6;
  color: var(--amber);
}

.feature-item h3,
.flow-step h3,
.contact-details h3 {
  margin: 18px 0 8px;
  color: var(--ink);
  font-size: 19px;
  line-height: 1.3;
}

.feature-item p,
.flow-step p,
.contact-details p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.service-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--border);
}

.flow-step {
  min-width: 0;
  padding: 30px 24px;
  background: #fff;
}

.flow-step span {
  color: var(--teal);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0;
}

.research-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 70px;
  align-items: center;
}

.evidence-list {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.evidence-list li {
  position: relative;
  padding: 14px 16px 14px 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: #304459;
  font-size: 14px;
}

.evidence-list li::before {
  position: absolute;
  top: 18px;
  left: 18px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--teal);
  border-radius: 50%;
  content: "";
}

.mobile-preview {
  justify-self: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 18px 46px rgba(21, 50, 79, 0.12);
}

.mobile-preview img {
  width: 240px;
  max-height: 640px;
  object-fit: cover;
  object-position: top;
  border-radius: 14px;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(360px, 1fr);
  gap: 24px;
  align-items: start;
  max-width: 980px;
  margin: 0 auto;
}

.contact-details,
.contact-form {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(28, 54, 83, 0.06);
}

.contact-details {
  padding: 28px;
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 24px;
}

.contact-form label {
  display: grid;
  gap: 7px;
  color: #304459;
  font-size: 14px;
  font-weight: 700;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.contact-form input {
  height: 44px;
  padding: 0 13px;
}

.contact-form textarea {
  min-height: 112px;
  padding: 12px 13px;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(21, 93, 159, 0.7);
  box-shadow: 0 0 0 3px rgba(21, 93, 159, 0.12);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 24px max(24px, calc((100vw - var(--max)) / 2));
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 54px;
  }

  .hero-copy {
    max-width: 760px;
  }

  .hero-media img {
    width: 100%;
  }

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

  .research-section,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .mobile-preview {
    justify-self: start;
  }
}

@media (max-width: 760px) {
  .site-header {
    min-height: 62px;
    padding: 10px 16px;
  }

  .brand strong {
    max-width: calc(100vw - 124px);
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .menu-button {
    display: block;
    flex: 0 0 auto;
  }

  .site-nav {
    position: absolute;
    top: 62px;
    right: 16px;
    left: 16px;
    display: none;
    grid-template-columns: 1fr;
    gap: 0;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: grid;
  }

  .site-nav a {
    padding: 14px 16px;
    border-bottom: 1px solid var(--bg-line);
  }

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

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

  .hero,
  .product-section,
  .service-section,
  .research-section,
  .contact-section {
    padding-right: 16px;
    padding-left: 16px;
  }

  .hero {
    gap: 34px;
    padding-top: 44px;
    padding-bottom: 42px;
  }

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

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

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .hero-facts,
  .feature-grid,
  .service-flow {
    grid-template-columns: 1fr;
  }

  .feature-item,
  .flow-step,
  .contact-details,
  .contact-form {
    padding: 22px;
  }

  .section-heading {
    text-align: left;
  }

  .contact-layout {
    gap: 16px;
  }

  .site-footer {
    display: grid;
    padding: 22px 16px;
  }
}

@media (max-width: 430px) {
  .brand small {
    display: none;
  }

  .hero-actions {
    grid-template-columns: 1fr;
  }

  .hero-facts div {
    padding: 14px;
  }

  .mobile-preview img {
    width: min(240px, calc(100vw - 72px));
  }
}