/* ===== Huarui Pump - Design Tokens ===== */
:root {
  --color-primary: #0B5E7B;
  --color-primary-dark: #084A63;
  --color-secondary: #E8F0F4;
  --color-accent: #D4943A;
  --color-accent-hover: #B87D2E;
  --color-text: #1A1A2E;
  --color-text-muted: #6B7280;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFB;
  --color-border: #E5E7EB;
  --color-success: #059669;
  --font-sans: 'Inter', 'Segoe UI', sans-serif;
  --container-max: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
}

/* ===== Global Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-primary-dark); }

/* ===== Container ===== */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 1.25rem; }
@media (min-width: 768px) { .container { padding: 0 2rem; } }

/* ===== Header / Nav ===== */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--color-bg); border-bottom: 1px solid var(--color-border); box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav-logo { font-size: 1.25rem; font-weight: 700; color: var(--color-primary); }
.nav-logo span { color: var(--color-accent); }

/* ===== Dropdown Mega Menu ===== */
.nav-links { display: flex; align-items: center; gap: 0.25rem; height: 100%; }
.nav-item { position: relative; display: flex; align-items: center; height: 100%; }
.nav-link { position: relative; display: inline-flex; align-items: center; gap: 0.25rem; padding: 0.5rem 0.75rem; font-size: 0.9375rem; font-weight: 500; color: var(--color-text); transition: color 0.2s; }
.nav-link:hover, .nav-link.active { color: var(--color-primary); }
.nav-link .fa-chevron-down { font-size: 0.7rem; transition: transform 0.2s; }
.nav-item:hover .nav-link .fa-chevron-down { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
  min-width: 220px;
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  z-index: 100;
}
.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(4px);
}
.dropdown a {
  display: block;
  padding: 0.625rem 1rem;
  font-size: 0.9rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}
.dropdown a:hover {
  background: var(--color-secondary);
  color: var(--color-primary);
}
.dropdown a .drop-label { font-weight: 500; display: block; }
.dropdown a .drop-desc { font-size: 0.8rem; color: var(--color-text-muted); display: block; margin-top: 0.125rem; }
.dropdown-divider { border-top: 1px solid var(--color-border); margin: 0.25rem 0; }

.nav-cta { display: inline-flex; align-items: center; gap: 0.5rem; background: var(--color-accent); color: #fff !important; padding: 0.625rem 1.5rem; border-radius: var(--radius-md); font-weight: 600; transition: background 0.2s; margin-left: 0.75rem; }
.nav-cta:hover { background: var(--color-accent-hover); }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #0B5E7B 0%, #0A4D63 50%, #083B4B 100%);
  color: #fff;
  padding: 6rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.12;
  background-image: url('https://images.unsplash.com/photo-1581092918056-0c4c3acd3789?w=1400&q=80');
  background-size: cover;
  background-position: center;
}
.hero-content { position: relative; z-index: 1; }
.hero h1 { font-size: clamp(1.75rem, 4vw, 3rem); font-weight: 800; line-height: 1.15; margin-bottom: 1rem; }
.hero p { font-size: clamp(1rem, 2vw, 1.25rem); opacity: 0.92; max-width: 600px; margin-bottom: 2rem; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 2.5rem; margin-top: 2.5rem; }
.badge-item { text-align: center; }
.badge-item .num { font-size: 1.75rem; font-weight: 700; }
.badge-item .lb { font-size: 0.8125rem; opacity: 0.8; }

/* ===== Sections ===== */
.section { padding: 5rem 0; }
.section-title { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; margin-bottom: 0.75rem; }
.section-subtitle { color: var(--color-text-muted); font-size: 1.075rem; margin-bottom: 3rem; max-width: 640px; }
.section-bg-alt { background: var(--color-bg-alt); }

/* ===== Product Cards ===== */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.product-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.3s, transform 0.3s;
}
.product-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.08); transform: translateY(-4px); }
.product-card img { width: 100%; height: 200px; object-fit: cover; }
.product-card-body { padding: 1.5rem; }
.product-card h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 0.5rem; }
.product-card p { font-size: 0.9375rem; color: var(--color-text-muted); }

/* ===== Why Choose Us ===== */
.why-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 2rem; }
.why-item { text-align: center; padding: 2rem 1.5rem; background: var(--color-bg); border-radius: var(--radius-md); border: 1px solid var(--color-border); transition: box-shadow 0.3s; }
.why-item:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
.why-item .icon-wrap { width: 60px; height: 60px; margin: 0 auto 1rem; background: var(--color-secondary); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: var(--color-primary); }
.why-item h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 0.5rem; }
.why-item p { font-size: 0.9375rem; color: var(--color-text-muted); line-height: 1.5; }

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, #0B5E7B 0%, #084A63 100%);
  color: #fff;
  padding: 5rem 0;
  text-align: center;
}
.cta-section h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; margin-bottom: 1rem; }
.cta-section p { opacity: 0.9; font-size: 1.075rem; margin-bottom: 2rem; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ===== Footer ===== */
.site-footer {
  background: #0F172A;
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 1.5rem;
  font-size: 0.9rem;
}
.site-footer h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 1rem; }
.site-footer a { color: rgba(255,255,255,0.7); }
.site-footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 1.5rem; text-align: center; font-size: 0.8125rem; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(212,148,58,0.3);
}
.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.6);
}
.btn-outline:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255,255,255,0.1);
}

/* ===== Global Footprint Tags ===== */
.country-tag {
  display: inline-block;
  background: var(--color-secondary);
  color: var(--color-primary);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: background 0.2s, color 0.2s;
}
.country-tag:hover { background: var(--color-primary); color: #fff; }

/* ===== Applications Grid ===== */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}
.app-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: box-shadow 0.3s, transform 0.3s;
}
.app-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.app-icon {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.app-card h3 { font-size: 1.125rem; margin-bottom: 0.5rem; }
.app-card p { font-size: 0.9375rem; color: var(--color-text-muted); margin-bottom: 1rem; }
.app-link { font-size: 0.875rem; font-weight: 600; }

/* ===== Certifications ===== */
.cert-row {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
  align-items: stretch;
}
.cert-badge {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem 2.5rem;
  min-width: 130px;
  text-align: center;
}
.cert-name {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}
.cert-sub {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ===== CTA Buttons Row ===== */
.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

/* ===== Mobile Nav Toggle ===== */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text);
  cursor: pointer;
  padding: 0.25rem;
}
@media (max-width: 767px) {
  .mobile-nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
    flex-direction: column;
    box-shadow: 0 8px 16px rgba(0,0,0,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-cta { display: none; }
  /* Dropdowns become static inside the mobile column */
  .nav-item { flex-direction: column; align-items: stretch; height: auto; }
  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--color-border);
    border-radius: 0;
    margin: 0 0 0.5rem 0.75rem;
    padding: 0 0 0 0.5rem;
    display: none;
  }
  .nav-item:hover .dropdown, .nav-item:focus-within .dropdown { display: block; }
  .hero { padding: 4rem 0 3rem; }
  .hero-badges { gap: 1.5rem; }
  .section { padding: 3rem 0; }
}

/* ===== Utility ===== */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }