/* =========================================================================
   COMPONENTS (components.css)
   HK Filtration — Corporate B2B Theme
   ========================================================================= */

/* --- Site Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: #fff;
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: box-shadow var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.logo-link svg {
  width: 32px;
  height: 32px;
  fill: var(--primary);
}

.logo-link:hover {
  color: var(--primary);
}

.main-nav ul {
  display: flex;
  gap: 0.25rem;
}

.main-nav a {
  display: block;
  padding: 0.5rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.main-nav a:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.main-nav a.active {
  color: var(--primary);
  font-weight: 600;
  background: var(--primary-light);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* --- Hero Section --- */
.hero-section {
  position: relative;
  padding: calc(var(--header-height) + 4rem) 0 4rem;
  background: linear-gradient(135deg, #f7f8fa 0%, #edf2f7 100%);
  overflow: hidden;
  min-height: 540px;
  display: flex;
  align-items: center;
}

.hero-section .hero-bg {
  display: none;
}

.hero-content {
  max-width: 560px;
}

.product-tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--primary-semi);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 1.25rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.hero-content h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
}

.hero-content h1 span {
  color: var(--accent);
}

.hero-content p {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  color: var(--text-secondary);
}

/* --- Cards --- */
.card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e0;
  transform: translateY(-2px);
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.card-icon svg {
  width: 24px;
  height: 24px;
  fill: var(--primary);
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* --- Contact Info Icon --- */
.contact-info-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: var(--radius-md);
}

.contact-info-icon svg {
  fill: var(--primary);
}

/* --- Specs Table --- */
.specs-table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: #fff;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table thead {
  background: var(--primary);
}

.specs-table th {
  padding: 0.9rem 1.25rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #fff;
  text-align: left;
}

.specs-table td {
  padding: 0.9rem 1.25rem;
  font-size: 0.9rem;
  border-top: 1px solid var(--border-color);
}

.specs-table tr:hover {
  background: var(--bg-secondary);
}

.spec-name {
  font-weight: 600;
  color: var(--text-primary);
}

.spec-value {
  color: var(--text-secondary);
}

/* --- Site Footer --- */
.site-footer {
  background: var(--primary);
  color: #fff;
  padding-top: 4rem;
}

.footer-grid {
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 2.5rem;
}

.footer-about p {
  color: rgba(255, 255, 255, 0.7);
  margin-top: 1rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-about .logo-link {
  color: #fff;
}

.footer-about .logo-link svg {
  fill: #fff;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.footer-contact-item svg {
  width: 18px;
  height: 18px;
  fill: rgba(255, 255, 255, 0.7);
  flex-shrink: 0;
}

.footer-contact-item a {
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  margin-top: 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  color: rgba(255, 255, 255, 0.5);
}

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

/* --- Partner Companies Box --- */
.partners-section {
  padding: 4rem 0;
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
}

.partners-title {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1.25rem;
  align-items: center;
}

.partner-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.partner-card:hover {
  border-color: var(--primary);
  background: #fff;
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.partner-icon {
  font-size: 1.5rem;
  margin-bottom: 0.4rem;
}

.partner-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.01em;
}

.partner-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.2rem;
}

/* --- Mobile Responsive --- */
@media (max-width: 768px) {
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    padding: 1rem;
    transform: translateY(-120%);
    transition: transform var(--transition-normal);
    z-index: 999;
  }

  .main-nav.open {
    transform: translateY(0);
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .main-nav a {
    padding: 0.75rem 1rem;
    font-size: 1rem;
  }

  .mobile-toggle {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }

  .hero-section {
    min-height: auto;
    padding: calc(var(--header-height) + 2rem) 0 2rem;
  }
}