:root {
  --primary-color: #0366d6;
  --primary-dark: #024ea2;
  --secondary-color: #f6f8fa;
  --text-dark: #24292e;
  --text-light: #586069;
  --border-color: #e1e4e8;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  overflow-x: hidden;
}

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

header {
  background: #fff;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

.header-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo img {
  height: 50px;
  width: auto;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  transition: var(--transition);
  padding: 0.5rem 1rem;
  border-radius: 4px;
}

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dark);
  padding: 0.5rem;
}

.hero {
  position: relative;
  height: 60vh;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('../images/image-43.png') center/cover no-repeat;
  opacity: 0.15;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: var(--spacing-md);
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  background: #fff;
  color: var(--primary-color);
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-primary:hover {
  background: var(--primary-dark);
}

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

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

.breadcrumb {
  background: #f6f8fa;
  padding: 1rem 0;
  font-size: 0.95rem;
  border-bottom: 1px solid #e1e4e8;
}

.breadcrumb ul {
  display: flex;
  list-style: none;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
}

.breadcrumb a {
  color: #0366d6;
  text-decoration: none;
  transition: var(--transition);
  font-weight: 500;
}

.breadcrumb a:hover {
  color: #024ea2;
  text-decoration: underline;
}

.breadcrumb li {
  color: #586069;
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: 0.5rem;
  color: #d1d5da;
  font-weight: 300;
}

.breadcrumb li:last-child {
  color: #24292e;
  font-weight: 500;
}

section {
  padding: var(--spacing-xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease-out;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.section-header p {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 700px;
  margin: 0 auto;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.product-card {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  animation: fadeInUp 0.8s ease-out;
  animation-fill-mode: both;
}

.product-card:nth-child(1) { animation-delay: 0.1s; }
.product-card:nth-child(2) { animation-delay: 0.2s; }
.product-card:nth-child(3) { animation-delay: 0.3s; }
.product-card:nth-child(4) { animation-delay: 0.4s; }

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-card-image {
  width: 100%;
  height: 250px;
  overflow: hidden;
  background: var(--secondary-color);
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.product-card:hover .product-card-image img {
  transform: scale(1.05);
}

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

.product-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.product-card p {
  color: var(--text-light);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.feature-card {
  padding: 2rem;
  background: #fff;
  border-radius: 8px;
  border-left: 4px solid var(--primary-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-dark);
}

.feature-card p {
  color: var(--text-light);
  line-height: 1.7;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.spec-table th {
  background: var(--secondary-color);
  font-weight: 600;
  color: var(--text-dark);
}

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

.spec-table tr:hover {
  background: var(--secondary-color);
}

.content-section {
  background: #fff;
  padding: 3rem 0;
}

.content-section:nth-child(even) {
  background: var(--secondary-color);
}

.content-wrapper {
  max-width: 900px;
  margin: 0 auto;
}

.content-wrapper h3 {
  font-size: 2rem;
  margin: 2rem 0 1rem;
  color: var(--text-dark);
}

.content-wrapper ul,
.content-wrapper ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.content-wrapper li {
  margin-bottom: 0.75rem;
  line-height: 1.7;
  color: var(--text-light);
}

.content-wrapper strong {
  color: var(--text-dark);
}

.image-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.image-showcase img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.image-showcase img:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.cta-section {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
  color: #fff;
  text-align: center;
  padding: var(--spacing-lg) 0;
}

.cta-section h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

footer {
  background: var(--text-dark);
  color: #fff;
  padding: 3rem 0 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

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

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: var(--transition);
  display: block;
  margin-bottom: 0.5rem;
}

.footer-section a:hover {
  color: #fff;
  padding-left: 0.5rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  font-size: 1.5rem;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in {
  animation: fadeInUp 0.8s ease-out;
}

.slide-in {
  animation: slideInLeft 0.8s ease-out;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  nav ul {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: #fff;
    flex-direction: column;
    padding: 2rem;
    gap: 0;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
  }

  nav ul.active {
    left: 0;
  }

  nav li {
    width: 100%;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
  }

  nav a {
    display: block;
    width: 100%;
  }

  .mobile-toggle {
    display: block;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .content-wrapper h3 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-xl: 3rem;
    --spacing-lg: 2rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }

  .back-to-top {
    width: 40px;
    height: 40px;
    bottom: 1rem;
    right: 1rem;
  }
}