:root {
  --navy: #16233f;
  --blue: #2f6fed;
  --teal: #4fc3dc;
  --green: #3aa76d;
  --gray-bg: #f6f8fb;
  --text: #2b2f36;
  --muted: #6b7280;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: #fff;
}

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

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid #eaedf2;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

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

.brand img { height: 26px; }

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
}

nav.main-nav > ul {
  list-style: none;
  display: flex;
  gap: 32px;
  margin: 0;
  padding: 0;
}

nav.main-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: border-color .2s, color .2s;
}

nav.main-nav a:hover,
nav.main-nav a.active {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

nav.main-nav a.nav-cta {
  background: var(--blue);
  color: #fff;
  padding: 8px 16px;
  border-radius: 6px;
  border-bottom: none;
}

nav.main-nav a.nav-cta:hover {
  background: #2558c4;
  color: #fff;
}

.menu-toggle { display: none; }

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

.dropdown-arrow {
  font-size: 11px;
  margin-left: 4px;
}

.dropdown-menu {
  list-style: none;
  margin: 0;
  padding: 8px;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: #fff;
  border: 1px solid #eaedf2;
  border-radius: 10px;
  box-shadow: 0 12px 28px rgba(22,35,63,.12);
  display: none;
  flex-direction: column;
  gap: 2px;
}

.has-dropdown:hover .dropdown-menu {
  display: flex;
}

.dropdown-menu li a {
  display: block;
  border-bottom: none;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 14px;
}

.dropdown-menu li a:hover {
  background: var(--gray-bg);
  color: var(--blue);
}

/* Hero */
.hero {
  position: relative;
  background: linear-gradient(115deg, var(--navy) 0%, #1b2b4d 60%, #223768 100%);
  color: #fff;
  padding: 84px 0;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79,195,220,.14), transparent 72%);
}

.hero h1 {
  font-size: 36px;
  margin: 0 0 12px;
  position: relative;
  font-weight: 700;
  letter-spacing: .01em;
}

.hero p.subtitle {
  font-size: 18px;
  color: #cfd8ee;
  margin: 0 0 28px;
  position: relative;
}

.page-hero {
  background: linear-gradient(120deg, var(--navy), #223768);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}

.page-hero.has-photo {
  background-size: cover;
  background-position: center;
  position: relative;
}

.page-hero.has-photo::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(22,35,63,.72), rgba(34,55,104,.72));
}

.page-hero.has-photo .container {
  position: relative;
}

.page-hero h1 { font-size: 32px; margin: 0; }

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .01em;
}

.btn-primary {
  background: var(--green);
  color: #fff;
}

.btn-primary:hover { background: #329263; color: #fff; }

.btn-outline {
  border: 1px solid rgba(255,255,255,.6);
  color: #fff;
  margin-left: 12px;
}

.btn-outline:hover { background: rgba(255,255,255,.1); color: #fff; }

/* Sections */
section { padding: 72px 0; }
section.alt { background: var(--gray-bg); }

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.section-head h2 {
  font-size: 28px;
  color: var(--navy);
  margin: 0 0 12px;
}

.section-head p { color: var(--muted); margin: 0; }

.eyebrow {
  color: var(--teal);
  font-weight: 700;
  letter-spacing: .04em;
  font-size: 14px;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}

/* Card grid */
.grid {
  display: grid;
  gap: 28px;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: #fff;
  border: 1px solid #eaedf2;
  border-radius: 12px;
  padding: 28px;
  text-align: center;
  transition: box-shadow .2s, transform .2s;
}

.card:hover {
  box-shadow: 0 12px 28px rgba(22,35,63,.08);
  transform: translateY(-3px);
}

.card h3 { color: var(--navy); font-size: 18px; margin: 4px 0 8px; }
.card p { color: var(--muted); font-size: 14px; margin: 0; }

.card-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--gray-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--blue);
}

.card-icon svg {
  width: 26px;
  height: 26px;
}

.card {
  display: block;
}

.card:hover .card-icon {
  background: var(--blue);
  color: #fff;
  transition: background .2s, color .2s;
}

/* Product blocks */
.product-block {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0;
  border-bottom: 1px solid #eaedf2;
}

.product-block:last-child { border-bottom: none; }

.product-block.reverse { grid-template-columns: 1fr 320px; }
.product-block.reverse .product-img { order: 2; }

.product-img {
  border: 1px solid #eaedf2;
  border-radius: 12px;
  padding: 16px;
  background: #fff;
}

.product-info h3 {
  color: var(--teal);
  font-size: 22px;
  margin: 0 0 8px;
}

.product-info p.desc { color: var(--muted); margin: 0 0 18px; }

.product-info ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.product-info li {
  font-size: 14px;
  color: var(--text);
  padding-left: 20px;
  position: relative;
}

.product-info li::before {
  content: "\00BB";
  color: var(--blue);
  position: absolute;
  left: 0;
  font-weight: 700;
}

/* Client logos */
.client-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.client-strip span {
  background: var(--gray-bg);
  border-radius: 8px;
  padding: 14px 22px;
  font-weight: 600;
  color: var(--navy);
  font-size: 14px;
}

.client-strip .client-logo {
  background: #fff;
  border: 1px solid #eaedf2;
  border-radius: 8px;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.client-strip .client-logo img {
  height: 40px;
  width: auto;
}

/* Certification */
.cert-block {
  display: flex;
  align-items: center;
  gap: 32px;
  background: var(--gray-bg);
  border-radius: 12px;
  padding: 32px;
  margin-top: 48px;
}

.cert-block img {
  width: 140px;
  border-radius: 6px;
  border: 1px solid #eaedf2;
  flex-shrink: 0;
}

.cert-block h3 { color: var(--navy); margin: 0 0 8px; font-size: 18px; }
.cert-block p { color: var(--muted); margin: 0; font-size: 14px; }

@media (max-width: 640px) {
  .cert-block { flex-direction: column; text-align: center; }
}

/* About */
.about-text p { margin: 0 0 14px; color: var(--text); }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
  margin-top: 48px;
}

.stat-grid strong {
  display: block;
  font-size: 30px;
  color: var(--blue);
}

.stat-grid span { color: var(--muted); font-size: 14px; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info li {
  list-style: none;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 20px;
  color: var(--text);
}

.contact-info li strong { color: var(--navy); display: block; margin-bottom: 2px; }

.contact-info .icon {
  color: var(--blue);
  font-size: 18px;
  margin-top: 2px;
}

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

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

form.contact-form input,
form.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #d8dde5;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
}

form.contact-form textarea { min-height: 120px; resize: vertical; }

/* Footer */
footer.site-footer {
  background: var(--navy);
  color: #b9c2d6;
  padding: 48px 0 24px;
}

footer.site-footer .footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(150px, 1fr) minmax(300px, 1.3fr);
  gap: 32px;
  margin-bottom: 32px;
}

footer.site-footer h4 {
  color: #fff;
  font-size: 15px;
  margin: 0 0 14px;
}

footer.site-footer p, footer.site-footer li { font-size: 14px; margin: 0 0 8px; }

footer.site-footer ul { list-style: none; padding: 0; margin: 0; }
footer.site-footer a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 20px;
  font-size: 13px;
  text-align: center;
  color: #8a93ac;
}

.footer-bottom a {
  color: inherit;
}

.footer-bottom a:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 860px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr 1fr; }
  .product-block, .product-block.reverse {
    grid-template-columns: 1fr;
  }
  .product-block.reverse .product-img { order: 0; }
  .product-info ul { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  footer.site-footer .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  nav.main-nav > ul { gap: 16px; flex-wrap: wrap; }
  .site-header .container { flex-wrap: wrap; height: auto; padding: 12px 24px; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding: 0 0 0 12px;
    display: flex;
  }
}