@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root {
  --primary: #1b4f8a;
  --primary-dark: #153d6b;
  --secondary: #2e7dd1;
  --accent: #e87722;
  --accent-hover: #cf6618;
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #333333;
  --text-muted: #666666;
  --footer: #1a2332;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(27, 79, 138, 0.08);
  --radius: 8px;
  --header-h: 72px;
  --max-w: 1200px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  padding-top: var(--header-h);
}

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

a {
  color: var(--secondary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--primary);
}

.container {
  width: min(100% - 2rem, var(--max-w));
  margin-inline: auto;
}

.site-header .container {
  width: 100%;
  max-width: none;
  padding-inline: clamp(0.75rem, 2vw, 1.5rem);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1rem;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
  flex-shrink: 0;
}

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

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

.logo-text {
  display: none;
}

@media (min-width: 768px) {
  .logo-text {
    display: block;
    max-width: 280px;
    line-height: 1.3;
    white-space: nowrap;
  }
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 0.75rem;
}

@media (min-width: 900px) {
  .nav-desktop {
    display: flex;
    gap: 1.25rem;
  }
}

.nav-desktop a {
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius);
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--primary);
  background: var(--bg-alt);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.lang-btn {
  background: none;
  border: none;
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition);
}

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

.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

@media (min-width: 900px) {
  .menu-toggle {
    display: none;
  }
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
}

.nav-mobile {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.nav-mobile.open {
  display: block;
}

.nav-mobile a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text);
  font-weight: 500;
  border-radius: var(--radius);
}

.nav-mobile a:hover,
.nav-mobile a.active {
  background: var(--bg-alt);
  color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

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

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

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: #fff;
}

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

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

.btn-secondary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

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

/* Hero */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--secondary) 100%);
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
    url('../assets/air-bearings.jpg') center/cover no-repeat;
  opacity: 0.15;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 4rem 0;
  max-width: 680px;
}

.hero-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Page hero (inner pages) */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  padding: 3.5rem 0;
}

.page-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 0.75rem;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.88);
  max-width: 640px;
  font-size: 1.05rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.7);
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.85);
}

.breadcrumb a:hover {
  color: #fff;
}

/* Sections */
.section {
  padding: 4.5rem 0;
}

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

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--text-muted);
}

/* Product cards */
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.product-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(27, 79, 138, 0.12);
}

.product-card-img {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--bg-alt);
}

.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-card-body {
  padding: 1.5rem;
}

.product-card-body h3 {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.product-card-body p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .feature-grid.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }

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

.feature-item {
  padding: 1.75rem;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.section-alt .feature-item {
  background: #fff;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.feature-item h3 {
  font-size: 1.05rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Application cards */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.app-card {
  text-align: center;
  padding: 1.5rem 1rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.app-card:hover {
  border-color: var(--secondary);
}

.app-card .app-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.app-card h3 {
  font-size: 0.9rem;
  color: var(--primary);
}

/* About split */
.split-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .split-section {
    grid-template-columns: 1fr 1fr;
  }
}

.split-section img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.split-content h2 {
  font-size: 1.75rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.split-content p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 3.5rem 0;
  text-align: center;
}

.cta-band h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 0.75rem;
}

.cta-band p {
  opacity: 0.9;
  margin-bottom: 1.5rem;
  max-width: 520px;
  margin-inline: auto;
}

.cta-band .contact-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

.cta-band a {
  color: #fff;
  font-weight: 600;
}

/* Product detail */
.product-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .product-detail {
    grid-template-columns: 1fr 1fr;
  }
}

.product-detail-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--bg-alt);
}

.product-detail-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 280px;
}

.product-detail-info h2 {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.product-model {
  display: inline-block;
  background: var(--bg-alt);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.spec-table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.spec-table th,
.spec-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.spec-table th {
  background: var(--bg-alt);
  color: var(--primary);
  font-weight: 600;
  white-space: nowrap;
}

.spec-table tr:last-child td {
  border-bottom: none;
}

.spec-table tbody tr:hover {
  background: rgba(46, 125, 209, 0.04);
}

.spec-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

.check-list {
  list-style: none;
  margin: 1rem 0;
}

.check-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--secondary);
  font-weight: 700;
}

.subsection-title {
  font-size: 1.25rem;
  color: var(--primary);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
  }
}

.contact-info-card {
  background: var(--bg-alt);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.contact-info-card h3 {
  color: var(--primary);
  margin-bottom: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact-item-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}

.contact-item div strong {
  display: block;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.contact-item div span,
.contact-item div a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.contact-form {
  background: #fff;
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(46, 125, 209, 0.15);
}

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

.map-placeholder {
  margin-top: 2rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
}

/* Footer */
.site-footer {
  background: var(--footer);
  color: rgba(255, 255, 255, 0.85);
  padding: 3.5rem 0 1.5rem;
}

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

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand .logo-link {
  color: #fff;
  margin-bottom: 1rem;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  opacity: 0.8;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.5rem;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
  opacity: 0.7;
}

.footer-icp {
  color: rgba(255, 255, 255, 0.75);
}

.footer-icp:hover {
  color: #fff;
}