:root {
  --bg: #f5f8fb;
  --panel: #ffffff;
  --text: #152536;
  --muted: #667789;
  --line: #dce8ef;
  --primary: #0f6f8f;
  --accent: #16a3b8;
  --shadow: 0 18px 48px rgba(28, 57, 82, 0.11);
  --hero-image: url("./assets/images/hero-office.webp");
  --building-image: url("./assets/images/shenzhen-building.webp");
  --data-image: url("./assets/images/service-data.webp");
  --consulting-image: url("./assets/images/service-consulting.webp");
  --software-image: url("./assets/images/service-software.webp");
  --ai-image: url("./assets/images/service-ai-app.webp");
  --network-image: url("./assets/images/service-network.webp");
  --contact-image: url("./assets/images/contact-building.webp");
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 max(28px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(220, 232, 239, 0.84);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.brand span {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #405568;
  font-size: 15px;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--primary);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
}

.section-band,
.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 86px 28px;
}

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  align-items: center;
  gap: 48px;
}

.section-kicker {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.16;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: 30px;
  line-height: 1.25;
}

h3 {
  margin-bottom: 10px;
  font-size: 19px;
}

.hero__lead {
  max-width: 680px;
  color: #405568;
  font-size: 18px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 18px;
  background: #fff;
  color: var(--text);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(28, 57, 82, 0.1);
}

.button--primary {
  border-color: transparent;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.button--ghost {
  color: var(--primary);
  background: rgba(255, 255, 255, 0.76);
}

.hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.hero__facts div,
.service-card,
.info-panel,
.contact-card,
.message-form,
.solution-detail {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.hero__facts div {
  padding: 14px;
}

dt {
  color: var(--muted);
  font-size: 13px;
}

dd {
  margin: 0;
  font-weight: 800;
}

.visual-slot {
  min-height: 360px;
  border: 1px solid rgba(220, 232, 239, 0.9);
  border-radius: 8px;
  background-color: #e9f2f7;
  background-position: center;
  background-size: cover;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.visual-slot::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  min-height: inherit;
  background:
    linear-gradient(135deg, rgba(15, 111, 143, 0.2), rgba(22, 163, 184, 0.06)),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.28) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.22) 0 1px, transparent 1px 64px);
}

.visual-slot--hero {
  min-height: 480px;
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.22), rgba(255, 255, 255, 0.12)), var(--hero-image);
}

.visual-slot--building {
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.12), rgba(255, 255, 255, 0.12)), var(--building-image);
}

.visual-slot--data {
  min-height: 260px;
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.14), rgba(255, 255, 255, 0.08)), var(--data-image);
}

.section--split,
.section--solutions,
.section--contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  gap: 36px;
  align-items: center;
}

.section__copy p {
  color: #405568;
}

.principles {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.principles span,
.service-card span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 0 10px;
  color: var(--primary);
  background: #e8f5f7;
  font-size: 13px;
  font-weight: 800;
}

.section-title {
  max-width: 780px;
  margin-bottom: 28px;
}

.section-title span {
  color: var(--muted);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.service-card {
  min-height: 286px;
  padding: 22px;
  overflow: hidden;
}

.service-card p {
  color: #526577;
  min-height: 92px;
}

.card-icon {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  margin-bottom: 18px;
  color: transparent;
  font-size: 0;
  background-position: center;
  background-size: cover;
}

.service-card:nth-child(1) .card-icon {
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.16), rgba(255,255,255,0.08)), var(--software-image);
}

.service-card:nth-child(2) .card-icon {
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.16), rgba(255,255,255,0.08)), var(--consulting-image);
}

.service-card:nth-child(3) .card-icon {
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.16), rgba(255,255,255,0.08)), var(--ai-image);
}

.service-card:nth-child(4) .card-icon {
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.16), rgba(255,255,255,0.08)), var(--data-image);
}

.service-card:nth-child(5) .card-icon {
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.16), rgba(255,255,255,0.08)), var(--network-image);
}

.service-card span {
  margin: 4px 4px 0 0;
}

.solution-list {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.solution-item {
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 16px;
  text-align: left;
  color: #405568;
  background: #fff;
}

.solution-item.active,
.solution-item:hover {
  color: var(--primary);
  border-color: rgba(22, 163, 184, 0.42);
  background: #edf9fb;
}

.solution-detail {
  padding: 18px;
}

.solution-detail p {
  color: #526577;
}

.solution-detail .visual-slot {
  min-height: 300px;
  margin-bottom: 18px;
  background-image: linear-gradient(135deg, rgba(14, 101, 131, 0.14), rgba(255, 255, 255, 0.08)), var(--data-image);
}

.info-panel {
  padding: 10px 22px;
}

.info-panel dl {
  margin: 0;
}

.info-panel dl div {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.info-panel dl div:last-child {
  border-bottom: 0;
}

.contact-list {
  margin: 22px 0 0;
}

.contact-list div {
  margin-bottom: 14px;
}

.contact-card,
.message-form {
  padding: 28px;
}

.contact-card {
  background-image: linear-gradient(135deg, rgba(255,255,255,0.88), rgba(255,255,255,0.92)), var(--contact-image);
  background-position: center;
  background-size: cover;
}

.message-form {
  display: grid;
  gap: 14px;
}

.message-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.message-form input,
.message-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  background: #fff;
  outline: none;
}

.message-form input:focus,
.message-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(22, 163, 184, 0.12);
}

.form-tip {
  min-height: 24px;
  margin: 0;
  color: var(--primary);
  font-size: 14px;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) auto auto;
  gap: 24px;
  align-items: center;
  padding: 30px max(28px, calc((100vw - 1180px) / 2));
  color: #dce8ef;
  background: #10293b;
}

.site-footer p {
  margin: 6px 0 0;
  color: #a9bac7;
}

.footer-links,
.record-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: #c5d4df;
}

.record-links a {
  color: #dce8ef;
}

.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: #fff;
  background: var(--primary);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.back-top.show {
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 1080px) {
  .hero,
  .section--split,
  .section--solutions,
  .section--contact {
    grid-template-columns: 1fr;
  }

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

  .site-footer {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 64px;
    padding: 0 18px;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: none;
    padding: 12px 18px 18px;
    border-bottom: 1px solid var(--line);
    background: #fff;
  }

  .site-nav.open {
    display: grid;
    gap: 10px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .section-band,
  .section {
    padding: 58px 18px;
  }

  .hero {
    min-height: auto;
    padding-top: 70px;
  }

  .hero__facts,
  .service-grid {
    grid-template-columns: 1fr;
  }

  .visual-slot,
  .visual-slot--hero {
    min-height: 280px;
  }

  .info-panel dl div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .site-footer {
    padding: 26px 18px;
  }
}