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

:root {
  --primary: #FFB800;
  --primary-dark: #FF9500;
  --secondary: #1A1A2E;
  --accent: #00D4AA;
  --light: #FFFFFF;
  --gray: #F5F5F7;
  --gray-dark: #86868B;
  --text: #1D1D1F;
  --success: #34C759;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--light);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  background: var(--light);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-dark);
}

.logo-icon {
  font-size: 32px;
}

.nav {
  display: flex;
  gap: 30px;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: color 0.3s;
}

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

.cart-btn {
  position: relative;
  background: var(--primary);
  border: none;
  padding: 10px 18px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 20px;
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.cart-count {
  position: absolute;
  top: -5px;
  right: -5px;
  background: var(--secondary);
  color: var(--light);
  font-size: 12px;
  font-weight: 700;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero {
  background: linear-gradient(135deg, var(--secondary) 0%, #16213E 100%);
  color: var(--light);
  padding: 100px 20px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  margin-bottom: 20px;
  font-weight: 700;
}

.hero p {
  font-size: clamp(18px, 2vw, 22px);
  margin-bottom: 30px;
  opacity: 0.9;
}

.btn-primary {
  background: var(--primary);
  color: var(--secondary);
  padding: 15px 35px;
  border: none;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s;
}

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

.categories {
  padding: 80px 20px;
  background: var(--gray);
}

.categories h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 30px;
  color: var(--secondary);
}

.category-filter {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  background: var(--light);
  border: 2px solid var(--gray-dark);
  padding: 10px 25px;
  border-radius: 25px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s;
}

.filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
}

.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--secondary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.product-card {
  background: var(--light);
  border-radius: 15px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.product-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
}

.product-info {
  padding: 20px;
}

.product-category {
  color: var(--gray-dark);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.product-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--secondary);
}

.product-description {
  font-size: 14px;
  color: var(--gray-dark);
  margin-bottom: 15px;
  line-height: 1.5;
}

.product-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.product-price {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-dark);
}

.btn-add {
  background: var(--primary);
  color: var(--secondary);
  border: none;
  padding: 10px 20px;
  border-radius: 20px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-add:hover {
  background: var(--primary-dark);
  transform: scale(1.05);
}

.about {
  padding: 80px 20px;
  background: var(--light);
}

.about h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 50px;
  color: var(--secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.about-card {
  text-align: center;
  padding: 30px;
  background: var(--gray);
  border-radius: 15px;
  transition: all 0.3s;
}

.about-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.about-icon {
  font-size: 48px;
  margin-bottom: 15px;
  display: block;
}

.about-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--secondary);
}

.about-card p {
  color: var(--gray-dark);
  line-height: 1.6;
}

.certificates {
  padding: 80px 20px;
  background: var(--secondary);
  color: var(--light);
}

.certificates h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 50px;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.cert-card {
  background: rgba(255, 255, 255, 0.1);
  padding: 40px 30px;
  border-radius: 15px;
  text-align: center;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.cert-icon {
  font-size: 60px;
  margin-bottom: 20px;
  display: block;
}

.cert-card h3 {
  font-size: 22px;
  margin-bottom: 10px;
  color: var(--primary);
}

.cert-card p {
  opacity: 0.9;
  line-height: 1.6;
}

.contacts {
  padding: 80px 20px;
  background: var(--gray);
}

.contacts h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 50px;
  color: var(--secondary);
}

.contacts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.contact-card {
  background: var(--light);
  padding: 30px;
  border-radius: 15px;
  text-align: center;
  box-shadow: var(--shadow);
}

.contact-icon {
  font-size: 40px;
  margin-bottom: 15px;
  display: block;
}

.contact-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--secondary);
}

.contact-card p {
  color: var(--gray-dark);
}

.contact-card a {
  color: var(--primary-dark);
  text-decoration: none;
  font-weight: 600;
}

.footer {
  background: var(--secondary);
  color: var(--light);
  text-align: center;
  padding: 30px 20px;
}

.cart-modal,
.checkout-modal,
.success-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
}

.cart-modal.active,
.checkout-modal.active,
.success-modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.cart-overlay,
.checkout-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
}

.cart-content,
.checkout-content {
  position: relative;
  background: var(--light);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.cart-header,
.checkout-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--gray);
}

.cart-header h2,
.checkout-header h2 {
  font-size: 24px;
  color: var(--secondary);
}

.cart-close,
.checkout-close {
  background: none;
  border: none;
  font-size: 32px;
  cursor: pointer;
  color: var(--gray-dark);
  transition: color 0.3s;
}

.cart-close:hover,
.checkout-close:hover {
  color: var(--text);
}

.cart-items {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.cart-item {
  display: flex;
  gap: 15px;
  padding: 15px;
  background: var(--gray);
  border-radius: 10px;
  margin-bottom: 15px;
}

.cart-item-image {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  background: var(--light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
}

.cart-item-info {
  flex: 1;
}

.cart-item-title {
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--secondary);
}

.cart-item-price {
  color: var(--primary-dark);
  font-weight: 700;
}

.cart-item-quantity {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
}

.qty-btn {
  background: var(--primary);
  border: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  font-weight: 700;
  color: var(--secondary);
}

.cart-item-remove {
  background: none;
  border: none;
  color: #FF3B30;
  cursor: pointer;
  font-size: 20px;
  margin-left: auto;
}

.cart-footer {
  padding: 20px;
  border-top: 1px solid var(--gray);
}

.cart-total {
  display: flex;
  justify-content: space-between;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--secondary);
}

.cart-total-price {
  color: var(--primary-dark);
}

.btn-checkout,
.btn-submit {
  width: 100%;
  padding: 15px;
  font-size: 16px;
}

.checkout-content {
  max-height: 90vh;
  overflow-y: auto;
}

.checkout-form {
  padding: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--gray);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  min-height: 80px;
  resize: vertical;
}

.order-summary {
  background: var(--gray);
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
}

.order-summary h3 {
  margin-bottom: 15px;
  color: var(--secondary);
}

.order-total {
  display: flex;
  justify-content: space-between;
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-dark);
}

.success-content {
  background: var(--light);
  padding: 50px 30px;
  border-radius: 20px;
  text-align: center;
  max-width: 400px;
  width: 90%;
}

.success-icon {
  font-size: 80px;
  display: block;
  margin-bottom: 20px;
}

.success-content h2 {
  font-size: 28px;
  margin-bottom: 15px;
  color: var(--secondary);
}

.success-content p {
  color: var(--gray-dark);
  margin-bottom: 25px;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  
  .hero {
    padding: 60px 20px;
  }
  
  .categories,
  .about,
  .certificates,
  .contacts {
    padding: 50px 20px;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
}