:root {
  --blue: #1C4F9C;
  --blue-dark: #123A75;
  --blue-light: #EAF1FB;
  --accent: #00A3E0;
  --text: #2B2B2B;
  --muted: #6B7280;
  --bg: #FFFFFF;
  --bg-soft: #F5F7FA;
  --border: #E5E7EB;
  --nav-h: 68px;
  --shadow: 0 4px 20px rgba(28, 79, 156, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a, button {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.navbar {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: 10px; }

.brand .logo {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 16px;
}

.brand .logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 6px;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text .bn { font-weight: 700; font-size: 15px; color: var(--blue); }
.brand-text .be { font-size: 11px; color: var(--muted); }

.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; }

.nav-links a {
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text);
  transition: background 0.2s, color 0.2s;
}

.nav-links a.active, .nav-links a:hover {
  color: var(--blue);
  background: var(--blue-light);
}

/* ---------- Nav dropdown ---------- */
.has-sub { position: relative; }

.has-sub > a {
  display: block;
  position: relative;
  padding-right: 26px !important;
}

.has-sub > a::after {
  content: "▾";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--muted);
  transition: transform 0.2s;
}

.has-sub.open > a::after { transform: translateY(-50%) rotate(180deg); }

.sub-nav {
  list-style: none;
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 220px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 12px 28px rgba(28, 79, 156, 0.14);
  padding: 6px;
  z-index: 200;
  flex-direction: column;
  gap: 2px;
}

@media (min-width: 901px) {
  .has-sub:hover .sub-nav,
  .has-sub.open .sub-nav,
  .has-sub:focus-within .sub-nav { display: flex; }
}

.sub-nav a {
  display: block;
  padding: 9px 14px !important;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text) !important;
  white-space: nowrap;
}

.sub-nav a:hover {
  color: var(--blue) !important;
  background: var(--blue-light);
}

.sub-nav a.active {
  color: var(--blue) !important;
  background: var(--blue-light);
  font-weight: 600;
}

.lang-toggle {
  margin-left: 8px;
  display: flex;
  gap: 4px;
  align-items: center;
}

.lang-toggle button {
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text);
  transition: all 0.2s;
}

.lang-toggle button.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 55%, #0B2A55 100%);
  color: #fff;
  padding: 80px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 85% 20%, rgba(0, 163, 224, 0.35), transparent 60%),
    radial-gradient(500px 260px at 10% 80%, rgba(0, 163, 224, 0.25), transparent 60%);
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; max-width: 760px; }

.hero .brand-en {
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  font-weight: 600;
}

.hero h1 { font-size: clamp(30px, 4.5vw, 48px); line-height: 1.25; margin-bottom: 16px; }
.hero h1 .zh { display: block; margin-bottom: 6px; }

.hero p.lead { font-size: 18px; opacity: 0.92; max-width: 620px; }
.hero p.lead.alt { color: rgba(255, 255, 255, 0.75); font-size: 15px; }

.hero-cta { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #0091cc; }

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
}
.btn-outline:hover { border-color: #fff; background: rgba(255, 255, 255, 0.08); }

/* ---------- Sections ---------- */
.section { padding: 70px 0; }

.section.soft { background: var(--bg-soft); }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 44px; }

.section-head .tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  background: var(--blue-light);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 14px;
  letter-spacing: 1px;
}

.section-head h2 { font-size: clamp(24px, 3vw, 32px); color: var(--blue-dark); margin-bottom: 12px; }
.section-head p { color: var(--muted); }

/* ---------- Cards ---------- */
.grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, 1fr);
}

.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.four { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(28, 79, 156, 0.12); }

.card .icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  background: var(--blue-light);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 18px;
}

.card h3 { font-size: 18px; margin-bottom: 10px; color: var(--blue-dark); }
.card h3 a { color: var(--blue-dark); transition: color 0.2s; }
.card h3 a:hover { color: var(--blue); text-decoration: underline; }
.card p { font-size: 14px; color: var(--muted); }

.card .card-more { margin-top: 14px; }
.card .card-more a {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  padding: 6px 14px;
  border: 1px solid var(--blue);
  border-radius: 20px;
  transition: all 0.2s;
}
.card .card-more a:hover {
  color: #fff;
  background: var(--blue);
}

/* ---------- Module name links inside catalog cards ---------- */
.mod-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.mod-list a {
  font-size: 13px;
  color: var(--blue-dark);
  border: 1px solid var(--border);
  background: var(--blue-light);
  border-radius: 20px;
  padding: 5px 14px;
  transition: all 0.2s;
}
.mod-list a:hover {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
}

/* ---------- Page banner ---------- */
.page-banner {
  background: linear-gradient(120deg, var(--blue), var(--blue-dark));
  color: #fff;
  padding: 56px 0;
  text-align: center;
}

.page-banner h1 { font-size: clamp(26px, 4vw, 38px); margin-bottom: 10px; }
.page-banner p { opacity: 0.9; }

/* ---------- Product / solution list ---------- */
.module-list { display: flex; flex-direction: column; gap: 18px; }

.module-item {
  display: flex;
  gap: 20px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 28px;
  align-items: flex-start;
}

.module-item .mo .icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--blue-light);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.module-item h3 { color: var(--blue-dark); font-size: 17px; margin-bottom: 6px; }
.module-item p { color: var(--muted); font-size: 14px; }

.stepper { display: flex; flex-direction: column; gap: 0; }

.step {
  display: flex;
  gap: 20px;
  position: relative;
  padding-bottom: 34px;
}

.step:last-child { padding-bottom: 0; }

.step::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 42px;
  bottom: 4px;
  width: 2px;
  background: var(--border);
}

.step:last-child::before { display: none; }

.step .num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step h3 { color: var(--blue-dark); font-size: 17px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 14px; }

/* ---------- Module groups (products) ---------- */
.modules { padding-top: 40px; }

.module-group { margin-bottom: 52px; }
.module-group:last-child { margin-bottom: 0; }

/* Quick index */
.cat-index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  margin-bottom: 30px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.cat-index-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  margin-right: 2px;
  white-space: nowrap;
}

.cat-index a {
  font-size: 13px;
  font-weight: 600;
  color: var(--blue-dark);
  background: #fff;
  border: 1px solid var(--border);
  padding: 5px 13px;
  border-radius: 20px;
  transition: all 0.2s;
  white-space: nowrap;
}

.cat-index a:hover {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
}

.cat-index .cat-expand,
.cat-index .cat-collapse {
  margin-left: 4px;
  font-size: 13px;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px 8px;
  white-space: nowrap;
}

.cat-index .cat-expand:hover,
.cat-index .cat-collapse:hover { color: var(--blue); }

/* Collapsible category */
.cat-label {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 0;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}

.cat-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.cat-label > span:first-child {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--blue);
  background: var(--blue-light);
  padding: 5px 16px;
  border-radius: 20px;
  white-space: nowrap;
  transition: all 0.2s;
}

.cat-label:hover > span:first-child {
  color: #fff;
  background: var(--blue);
}

.cat-label .cat-count {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 2px 9px;
  border-radius: 12px;
  white-space: nowrap;
}

.cat-label .cat-arrow {
  color: var(--muted);
  font-size: 12px;
  transition: transform 0.25s;
}

.module-group.open .cat-arrow { transform: rotate(180deg); }

.cat-body {
  display: none;
  padding-top: 24px;
}

.module-group.open .cat-body { display: block; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: start; }

.contact-info .info-item { display: flex; gap: 16px; margin-bottom: 22px; }
.contact-info .info-item .icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--blue-light);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-info h3 { color: var(--blue-dark); font-size: 16px; margin-bottom: 4px; }
.contact-info p, .contact-info a { color: var(--muted); font-size: 15px; }

/* ---------- Map card (keyless AMap links) ---------- */
.map-card {
  margin-top: 28px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(0, 163, 224, 0.10), transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(28, 79, 156, 0.10), transparent 45%),
    #fff;
}

.map-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--blue-light);
}

.map-card-head .pin { font-size: 20px; }
.map-card-head strong { color: var(--blue-dark); font-size: 16px; }
.map-card-head .badge {
  margin-left: auto;
  font-size: 11px;
  font-weight: 700;
  color: var(--blue);
  background: #fff;
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 12px;
  letter-spacing: 1px;
}

.map-card-body { padding: 20px; }

.map-card-body .map-addr { color: var(--text); font-size: 15px; margin-bottom: 8px; }
.map-card-body .map-tip { color: var(--muted); font-size: 13px; margin-bottom: 18px; }

.map-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.map-actions .btn { flex: 1 1 100%; }

.map-card::after {
  content: "";
  display: block;
  height: 6px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
}

.form-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.form-card h3 { color: var(--blue-dark); margin-bottom: 20px; font-size: 18px; }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text); }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
  -webkit-appearance: none;
  appearance: none;
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(28, 79, 156, 0.12);
}

.form-card button { width: 100%; }

.form-note { font-size: 13px; color: var(--muted); margin-top: 12px; text-align: center; }

/* ---------- Footer ---------- */
.site-footer { background: var(--blue-dark); color: rgba(255, 255, 255, 0.8); }

.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding: 52px 0 40px;
}

.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }

.site-footer .brand-text .bn { color: #fff; }
.site-footer .brand-text .be { color: rgba(255, 255, 255, 0.6); }

.footer-links { list-style: none; display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.footer-links a:hover { color: #fff; }

.footer-contact p { font-size: 14px; margin-bottom: 8px; }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

.footer-bottom a { display: block; margin-top: 6px; }
.footer-bottom a:hover { color: #fff; text-decoration: underline; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--blue);
  color: #fff;
  text-align: center;
  padding: 56px 0;
}

.cta-band h2 { font-size: 26px; margin-bottom: 10px; }
.cta-band p { opacity: 0.9; margin-bottom: 24px; }

/* ---------- Feature band (solutions page) ---------- */
.feature-band {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  padding: 36px 0;
}

.feature-band .fb-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.feature-band .fb-text h3 { font-size: 21px; margin-bottom: 6px; }
.feature-band .fb-text p { opacity: 0.92; font-size: 14px; max-width: 720px; }
.feature-band .fb-text h3 a { color: #fff; }
.feature-band .fb-text h3 a:hover { text-decoration: underline; }
.feature-band .btn-primary { background: #fff; color: var(--blue); }
.feature-band .btn-primary:hover { background: var(--blue-light); }

/* ---------- Back link ---------- */
.back-link { text-align: left; margin-bottom: 14px; font-size: 14px; }
.back-link a { color: rgba(255, 255, 255, 0.85); }
.back-link a:hover { color: #fff; text-decoration: underline; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .grid.four { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr 1fr; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 0;
    box-shadow: 0 12px 24px rgba(28, 79, 156, 0.1);
  }

  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 10px; border-radius: 8px; font-size: 16px; }
  .nav-toggle { display: flex; padding: 10px; }

  .has-sub > a::after { display: none; }
  .sub-nav {
    position: static;
    display: flex;
    box-shadow: none;
    border: none;
    border-left: 3px solid var(--blue-light);
    margin: 0 10px 10px 24px;
    padding: 0;
    min-width: 0;
  }
  .sub-nav a { font-size: 15px; padding: 10px 12px !important; }

  .lang-toggle { margin-left: 8px; padding-top: 8px; border-top: 1px solid var(--border); }
  .lang-toggle button { padding: 10px 18px; font-size: 15px; }
}

@media (max-width: 620px) {
  .grid, .grid.two, .grid.four { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; }
  .section { padding: 50px 0; }
  .module-item { flex-direction: column; }

  .hero { padding: 56px 0 64px; }
  .hero p.lead { font-size: 16px; }
  .hero-cta .btn { flex: 1 1 100%; }

  .page-banner { padding: 44px 0; }
  .cta-band { padding: 44px 0; }
  .form-card { padding: 24px; }
  .module-item { padding: 20px; }
  .card { padding: 24px; }
  .container { padding: 0 18px; }
  .cat-index { gap: 8px; }
  .cat-index .cat-expand,
  .cat-index .cat-collapse { width: 100%; text-align: center; border: 1px solid var(--border); border-radius: 20px; background: #fff; padding: 6px 0; }
}

@media (max-width: 420px) {
  .hero .brand-en { letter-spacing: 1px; font-size: 12px; }
  .brand-text .be { display: none; }
}