/* ===== Base ===== */
:root {
  --brand: #0a4d8c;
  --brand-dark: #073a6b;
  --brand-light: #2f7fc4;
  --accent: #00a8a8;
  --ink: #1c2733;
  --muted: #5b6b7b;
  --bg: #ffffff;
  --bg-soft: #f4f7fa;
  --border: #e2e8ef;
  --radius: 10px;
  --shadow: 0 6px 24px rgba(10, 77, 140, 0.08);
  --max: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-light); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

section { padding: 72px 0; }

h1, h2, h3 { line-height: 1.25; color: var(--ink); }
h2.section-title {
  font-size: 30px;
  text-align: center;
  margin-bottom: 8px;
}
.section-sub {
  text-align: center;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 44px;
}

.btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  padding: 13px 30px;
  border-radius: var(--radius);
  font-weight: 600;
  transition: background .2s, transform .2s;
}
.btn:hover { background: var(--brand-dark); color: #fff; transform: translateY(-2px); }
.btn.ghost {
  background: transparent;
  border: 2px solid #fff;
  color: #fff;
}
.btn.ghost:hover { background: #fff; color: var(--brand); }

/* ===== Top bar ===== */
.topbar {
  background: var(--brand-dark);
  color: #cfe2f2;
  font-size: 14px;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 40px;
  flex-wrap: wrap;
}
.topbar a { color: #cfe2f2; }
.topbar a:hover { color: #fff; }
.topbar .tb-contact span { margin-right: 22px; }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 104px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo img { height: 88px; width: auto; }

.nav { display: flex; gap: 6px; }
.nav a {
  padding: 10px 16px;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
  border-radius: 8px;
}
.nav a:hover { background: var(--bg-soft); color: var(--brand); }
.nav a.active { color: var(--brand); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 26px;
  color: var(--brand);
  cursor: pointer;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, rgba(7,58,107,.92), rgba(10,77,140,.82)),
    url("../assets/hero.svg") center/cover no-repeat;
  color: #fff;
  text-align: center;
  padding: 110px 0;
}
.hero h1 { font-size: 44px; margin-bottom: 18px; }
.hero p { font-size: 19px; color: #dce8f3; max-width: 680px; margin: 0 auto 32px; }
.hero .btn + .btn { margin-left: 14px; }

.page-hero {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: #fff;
  padding: 64px 0;
  text-align: center;
}
.page-hero h1 { font-size: 36px; }
.page-hero p { color: #cfe2f2; margin-top: 8px; }
.breadcrumb { font-size: 14px; color: #aecbe5; margin-top: 10px; }
.breadcrumb a { color: #aecbe5; }

/* ===== Cards / grids ===== */
.grid { display: grid; gap: 24px; }
.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 var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(10,77,140,.14); }
.card .icon {
  width: 52px; height: 52px;
  background: var(--bg-soft);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}
.card h3 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }

/* ===== Product categories ===== */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cat {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  background: #fff;
  transition: border-color .2s, box-shadow .2s;
}
.cat:hover { border-color: var(--brand-light); box-shadow: var(--shadow); }
.cat h3 { font-size: 17px; color: var(--brand); margin-bottom: 8px; }
.cat ul { list-style: none; }
.cat li { color: var(--muted); font-size: 14px; padding: 3px 0 3px 16px; position: relative; }
.cat li::before { content: "›"; position: absolute; left: 0; color: var(--brand-light); }

/* ===== Split section ===== */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split img { border-radius: var(--radius); box-shadow: var(--shadow); }
.split h2 { font-size: 30px; margin-bottom: 14px; }
.split p { color: var(--muted); margin-bottom: 14px; }
.split ul { margin: 16px 0; padding-left: 20px; color: var(--muted); }
.split ul li { margin-bottom: 8px; }

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

/* ===== Stats ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stats.stats-single { grid-template-columns: 1fr; }
.stats.stats-single .stat .num { font-size: 64px; }
.stat .num { font-size: 40px; font-weight: 800; color: var(--brand); }
.stat .label { color: var(--muted); font-size: 15px; }

/* ===== Brands ===== */
.brand-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.brand-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  background: #fff;
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .2s, box-shadow .2s, transform .2s;
}
.brand-item:hover { border-color: var(--brand-light); box-shadow: var(--shadow); transform: translateY(-3px); }
.brand-item img { max-height: 80px; max-width: 100%; width: auto; object-fit: contain; }

/* ===== CTA band ===== */
.cta-band {
  background: linear-gradient(135deg, var(--accent), var(--brand));
  color: #fff;
  text-align: center;
}
.cta-band h2 { font-size: 30px; color: #fff; margin-bottom: 12px; }
.cta-band p { color: #e4f6f6; margin-bottom: 26px; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; }
.info-list { list-style: none; }
.info-list li { display: flex; gap: 14px; margin-bottom: 22px; }
.info-list .ico { font-size: 22px; }
.info-list strong { display: block; color: var(--ink); }
.info-list span { color: var(--muted); }

form .field { margin-bottom: 18px; }
form label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 14px; }
form input, form textarea, form select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 15px;
}
form input:focus, form textarea:focus, form select:focus {
  outline: none;
  border-color: var(--brand-light);
}
form textarea { min-height: 130px; resize: vertical; }
.form-note { font-size: 13px; color: var(--muted); margin-top: 10px; }

/* ===== Footer ===== */
.site-footer {
  background: var(--brand-dark);
  color: #b9d2e6;
  padding: 56px 0 0;
  font-size: 15px;
}
.site-footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 36px; }
.site-footer h4 { color: #fff; margin-bottom: 16px; font-size: 16px; }
.site-footer a { color: #b9d2e6; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; }
.site-footer ul li { margin-bottom: 9px; }
.footer-logo { font-weight: 800; font-size: 20px; color: #fff; margin-bottom: 12px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  margin-top: 44px;
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: #8fb2cc;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .grid-3, .grid-4, .cat-grid, .stats { grid-template-columns: repeat(2, 1fr); }
  .brand-grid { grid-template-columns: repeat(3, 1fr); }
  .split, .contact-grid { grid-template-columns: 1fr; }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
  .nav {
    position: absolute;
    top: 104px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav.open { display: flex; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 32px; }
  .topbar .tb-contact { display: none; }
}
@media (max-width: 560px) {
  .grid-3, .grid-4, .cat-grid, .stats, .brand-grid { grid-template-columns: 1fr; }
  .site-footer .container { grid-template-columns: 1fr; }
  section { padding: 52px 0; }
}