:root {
  color-scheme: light;
  --ink: #17202a;
  --muted: #5b6776;
  --line: #d9e0e8;
  --paper: #f7f9fb;
  --white: #ffffff;
  --teal: #087f7a;
  --teal-dark: #075f5d;
  --gold: #b77d22;
  --red: #b4342a;
  --blue: #255f9f;
  --shadow: 0 18px 50px rgba(23, 32, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.93);
  border-bottom: 1px solid rgba(217, 224, 232, 0.85);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 174px;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: var(--white);
  background: var(--teal);
  border-radius: 8px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.2;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 2vw, 30px);
  color: #334155;
  font-size: 14px;
}

.nav a {
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav a:hover {
  color: var(--teal);
  border-color: var(--teal);
}

.header-call {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  color: var(--white);
  background: var(--ink);
  border-radius: 6px;
  font-weight: 700;
  white-space: nowrap;
}

.hero {
  position: relative;
  min-height: min(760px, calc(100vh - 68px));
  overflow: hidden;
  isolation: isolate;
}

.hero-image,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.hero-shade {
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(8, 20, 32, 0.92) 0%, rgba(8, 20, 32, 0.78) 38%, rgba(8, 20, 32, 0.34) 72%, rgba(8, 20, 32, 0.22) 100%),
    linear-gradient(0deg, rgba(8, 20, 32, 0.28), transparent 44%);
}

.hero-content {
  width: min(760px, calc(100% - 36px));
  padding: clamp(72px, 11vw, 132px) 0 42px;
  margin-left: clamp(18px, 7vw, 96px);
  color: var(--white);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 680px;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(16px, 1.8vw, 19px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 44px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 132px;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 6px;
  font-weight: 800;
}

.btn.primary {
  color: var(--white);
  background: var(--teal);
}

.btn.secondary {
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.44);
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  padding: 16px 18px;
  color: #26313d;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.trust-strip span {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 14px;
}

.section {
  padding: clamp(62px, 8vw, 104px) clamp(18px, 5vw, 72px);
}

.section-head {
  width: min(840px, 100%);
  margin: 0 auto 34px;
  text-align: center;
}

.section-head.compact {
  margin-bottom: 28px;
}

.section-head h2,
.contact-section h2 {
  margin-bottom: 12px;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-head p {
  color: var(--muted);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.build-section {
  background: var(--white);
}

.build-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.build-grid article {
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.build-grid strong {
  display: block;
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 20px;
}

.build-grid p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.solution-card {
  min-height: 430px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 28px rgba(23, 32, 42, 0.06);
}

.card-icon {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  margin-bottom: 18px;
  color: var(--white);
  background: var(--blue);
  border-radius: 8px;
  font-weight: 900;
}

.solution-card:nth-child(2) .card-icon {
  background: var(--teal);
}

.solution-card:nth-child(3) .card-icon {
  background: var(--gold);
}

.solution-card:nth-child(4) .card-icon {
  background: var(--red);
}

.solution-card h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.solution-card p,
.solution-card li {
  color: var(--muted);
  font-size: 15px;
}

.solution-card ul {
  padding-left: 18px;
  margin: 18px 0 0;
}

.solution-card li + li {
  margin-top: 8px;
}

.feature-band {
  color: var(--white);
  background: #132331;
}

.feature-band .section-head p,
.feature-band .feature-copy p {
  color: rgba(255, 255, 255, 0.76);
}

.feature-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(300px, 1.25fr);
  gap: 28px;
  width: min(1160px, 100%);
  margin: 0 auto;
}

.feature-copy {
  padding: 26px 0;
}

.text-link {
  display: inline-flex;
  margin-top: 16px;
  color: #7bd6d1;
  font-weight: 800;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.feature-list div {
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.055);
  border-radius: 8px;
}

.feature-list strong,
.feature-list span {
  display: block;
}

.feature-list span {
  margin-top: 7px;
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

.delivery-section {
  background: #eef4f7;
}

.delivery-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  width: min(1160px, 100%);
  margin: 0 auto;
}

.delivery-grid article {
  min-height: 250px;
  padding: 26px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 28px rgba(23, 32, 42, 0.06);
}

.delivery-grid span {
  display: inline-grid;
  width: 44px;
  height: 34px;
  place-items: center;
  margin-bottom: 18px;
  color: var(--teal);
  background: rgba(8, 127, 122, 0.1);
  border-radius: 6px;
  font-weight: 900;
}

.delivery-grid h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.delivery-grid p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.process-section {
  background: var(--white);
}

.process {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  width: min(1120px, 100%);
  padding: 0;
  margin: 0 auto;
  list-style: none;
}

.process li {
  padding: 22px;
  border-top: 4px solid var(--teal);
  background: var(--paper);
}

.process span {
  color: var(--gold);
  font-weight: 900;
}

.process strong {
  display: block;
  margin: 10px 0 8px;
  font-size: 20px;
}

.process p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.faq-section {
  background: var(--paper);
}

.faq-list {
  display: grid;
  gap: 12px;
  width: min(900px, 100%);
  margin: 0 auto;
}

details {
  padding: 18px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 800;
}

details p {
  margin: 12px 0 0;
  color: var(--muted);
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 480px);
  gap: 28px;
  align-items: center;
  padding: clamp(56px, 7vw, 88px) clamp(18px, 7vw, 96px);
  color: var(--white);
  background: linear-gradient(120deg, #0f2830, #143f3d 52%, #63391f);
}

.contact-section p {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.76);
}

.contact-panel {
  display: grid;
  gap: 12px;
  width: 100%;
  min-width: 0;
}

.contact-panel a,
.wechat-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  min-width: 0;
  overflow: hidden;
}

.contact-panel span,
.wechat-card span {
  display: block;
  color: rgba(255, 255, 255, 0.72);
}

.contact-panel strong,
.wechat-card strong {
  display: block;
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.2;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.wechat-card {
  align-items: center;
  justify-content: flex-start;
}

.wechat-card img {
  width: 132px;
  height: 132px;
  padding: 8px;
  background: var(--white);
  border-radius: 8px;
  flex: 0 0 auto;
  object-fit: contain;
}

.wechat-card small {
  display: block;
  margin-top: 5px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 13px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 22px clamp(18px, 5vw, 72px);
  color: #536171;
  background: var(--white);
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.float-contact {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  display: grid;
  gap: 8px;
}

.float-contact a,
.float-contact button {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  color: var(--white);
  background: var(--teal);
  border: 0;
  border-radius: 8px;
  box-shadow: var(--shadow);
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}

.float-contact button {
  background: var(--gold);
}

@media (max-width: 980px) {
  .nav {
    display: none;
  }

  .hero {
    min-height: 720px;
  }

  .solution-grid,
  .build-grid,
  .delivery-grid,
  .process {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 680px) {
  body {
    padding-bottom: 68px;
  }

  .site-header {
    padding: 12px 14px;
  }

  .header-call {
    display: none;
  }

  .hero {
    min-height: 760px;
  }

  .hero-content {
    width: calc(100% - 32px);
    margin-left: 16px;
    padding-top: 62px;
  }

  .solution-grid,
  .build-grid,
  .delivery-grid,
  .feature-list,
  .process {
    grid-template-columns: 1fr;
  }

  .solution-card {
    min-height: auto;
  }

  .float-contact {
    left: 12px;
    right: 12px;
    bottom: 12px;
    display: flex;
    justify-content: center;
    gap: 10px;
    pointer-events: none;
  }

  .float-contact a,
  .float-contact button {
    width: min(42vw, 148px);
    height: 44px;
    border-radius: 6px;
    pointer-events: auto;
  }

  .wechat-card {
    align-items: center;
    flex-direction: row;
  }

  .wechat-card img {
    width: 108px;
    height: 108px;
  }
}

@media (max-width: 420px) {
  .wechat-card {
    align-items: flex-start;
    flex-direction: column;
  }

  .wechat-card img {
    width: min(64vw, 180px);
    height: min(64vw, 180px);
  }
}