:root {
  --ink: #10151d;
  --muted: #5d6877;
  --line: #dbe1e9;
  --paper: #f7f8fa;
  --panel: #ffffff;
  --teal: #0d7f88;
  --teal-dark: #075b66;
  --amber: #c68b2c;
  --blue: #2457a6;
  --shadow: 0 24px 70px rgba(16, 21, 29, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 0 48px;
  color: #fff;
  transition: background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 1px 24px rgba(16, 21, 29, 0.12);
  backdrop-filter: blur(14px);
}

.brand,
.nav,
.hero-actions,
.hero-stats,
.site-footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 700;
  white-space: nowrap;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border: 2px solid currentColor;
  border-radius: 50%;
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 7px -6px 7px 14px;
  border-top: 2px solid currentColor;
  transform: rotate(-28deg);
}

.nav {
  gap: 28px;
  font-size: 14px;
}

.nav a,
.header-action {
  opacity: 0.9;
}

.header-action {
  padding: 9px 16px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 14px;
}

.hero {
  position: relative;
  min-height: 92vh;
  overflow: hidden;
  color: #fff;
  display: flex;
  align-items: center;
}

.hero-image,
.hero-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(8, 14, 22, 0.9), rgba(8, 14, 22, 0.58) 43%, rgba(8, 14, 22, 0.18) 72%),
    linear-gradient(0deg, rgba(8, 14, 22, 0.5), rgba(8, 14, 22, 0.08) 40%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(760px, calc(100% - 48px));
  margin-left: clamp(24px, 7vw, 108px);
  padding-top: 80px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--amber);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(42px, 7vw, 78px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 620px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 20px;
}

.hero-actions {
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

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

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

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

.button.secondary {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.08);
}

.button.full {
  width: 100%;
}

.hero-stats {
  gap: 22px;
  flex-wrap: wrap;
}

.hero-stats div {
  min-width: 138px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
}

.hero-stats dt {
  font-size: 28px;
  font-weight: 800;
}

.hero-stats dd {
  margin: 2px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.trust-strip span {
  min-height: 76px;
  display: grid;
  place-items: center;
  padding: 16px;
  background: #fff;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
}

.section {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 94px 0;
}

.intro {
  display: grid;
  grid-template-columns: minmax(240px, 0.9fr) minmax(280px, 1.1fr);
  gap: 64px;
}

h2 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.14;
  letter-spacing: 0;
}

.intro p:last-child,
.contact-copy p {
  color: var(--muted);
  font-size: 18px;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.section-lead {
  color: var(--muted);
  font-size: 18px;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.capability-grid article,
.product-list article,
.rfq-form {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 10px 30px rgba(16, 21, 29, 0.05);
}

.capability-grid article {
  min-height: 270px;
  padding: 28px;
}

.icon {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 34px;
  border-radius: 50%;
  color: #fff;
  background: var(--blue);
  font-weight: 800;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.25;
}

.capability-grid p,
.product-list p,
.timeline p,
.form-note,
.site-footer {
  color: var(--muted);
}

.products {
  width: 100%;
  max-width: none;
  padding-right: max(24px, calc((100% - 1180px) / 2));
  padding-left: max(24px, calc((100% - 1180px) / 2));
  background: #eef3f5;
}

.product-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.product-list article,
.insight-grid article {
  padding: 30px;
}

.insights {
  padding-top: 70px;
}

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

.insight-grid article {
  min-height: 300px;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 10px 30px rgba(16, 21, 29, 0.05);
}

.product-tag {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 28px;
  margin-bottom: 22px;
  padding: 0 10px;
  border-radius: 999px;
  color: var(--teal-dark);
  background: rgba(13, 127, 136, 0.1);
  font-size: 12px;
  font-weight: 800;
}

.insight-grid a {
  margin-top: auto;
  color: var(--teal-dark);
  font-weight: 800;
}

.process {
  padding-bottom: 80px;
}

.timeline {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.timeline li {
  position: relative;
  padding: 34px 24px 0 0;
}

.timeline span {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 22px;
  color: #fff;
  background: var(--teal);
  border-radius: 50%;
  font-weight: 800;
}

.contact {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 1.1fr);
  gap: 58px;
  align-items: start;
  padding-top: 70px;
}

.contact-points {
  display: grid;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.contact-points li {
  position: relative;
  padding-left: 22px;
}

.contact-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  background: var(--amber);
  border-radius: 50%;
}

.rfq-form {
  display: grid;
  gap: 16px;
  padding: 30px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #cfd7e2;
  border-radius: 6px;
  padding: 12px 13px;
  color: var(--ink);
  background: #fff;
  font: inherit;
}

textarea {
  resize: vertical;
}

.form-note {
  margin: 0;
  font-size: 13px;
}

.site-footer {
  justify-content: space-between;
  gap: 18px;
  padding: 32px 48px;
  border-top: 1px solid var(--line);
  background: #fff;
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 920px) {
  .site-header {
    padding: 0 24px;
  }

  .nav {
    display: none;
  }

  .hero-content {
    width: calc(100% - 40px);
    margin-left: 20px;
  }

  .trust-strip,
  .capability-grid,
  .insight-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .intro,
  .contact {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 620px) {
  .site-header {
    min-height: 64px;
  }

  .brand span:last-child {
    max-width: 164px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .header-action {
    display: none;
  }

  .hero {
    min-height: 860px;
  }

  .hero-overlay {
    background: linear-gradient(90deg, rgba(8, 14, 22, 0.92), rgba(8, 14, 22, 0.55));
  }

  .hero-copy {
    font-size: 17px;
  }

  .trust-strip,
  .capability-grid,
  .product-list,
  .insight-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .section {
    width: calc(100% - 36px);
    padding: 68px 0;
  }

  .products {
    width: 100%;
    padding-right: 18px;
    padding-left: 18px;
  }

  .capability-grid article {
    min-height: auto;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    padding: 28px 18px;
  }
}