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

:root {
  --primary-black: #0a0a0a;
  --secondary-black: #1a1a1a;
  --dark-gray: #2a2a2a;
  --medium-gray: #3a3a3a;
  --light-gray: #8a8a8a;
  --white: #ffffff;
  --gold: #c9a961;
  --gold-light: #d4b87a;
  --gold-dark: #b8944f;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
  background-color: var(--primary-black);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--dark-gray);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(10, 10, 10, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 2px;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 40px;
}

.nav-item {
  position: relative;
}

.nav-link {
  color: var(--white);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}

.nav-link:hover {
  color: var(--gold);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: var(--transition);
}

.nav-link:hover::after {
  width: 100%;
}

.lang-switch {
  display: flex;
  gap: 10px;
}

.lang-btn {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--medium-gray);
  color: var(--white);
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
}

.lang-btn.active {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--primary-black);
}

.lang-btn:hover {
  border-color: var(--gold);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
}

.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-black) 0%, var(--secondary-black) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(201, 169, 97, 0.1) 0%, transparent 50%);
}

.hero-content {
  text-align: center;
  z-index: 1;
  animation: fadeInUp 1s ease-out;
}

.hero-title {
  font-size: 72px;
  font-weight: 700;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--white) 0%, var(--gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 24px;
  color: var(--light-gray);
  margin-bottom: 40px;
  letter-spacing: 2px;
}

.hero-cta {
  display: inline-block;
  padding: 16px 48px;
  background: var(--gold);
  color: var(--primary-black);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
  border: 2px solid var(--gold);
}

.hero-cta:hover {
  background: transparent;
  color: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(201, 169, 97, 0.3);
}

.section {
  padding: 120px 0;
  position: relative;
}

.section-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  text-align: center;
  color: var(--white);
}

.section-subtitle {
  font-size: 18px;
  color: var(--light-gray);
  text-align: center;
  margin-bottom: 80px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 60px;
}

.product-card {
  background: var(--secondary-black);
  border: 1px solid var(--dark-gray);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-10px);
  border-color: var(--gold);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.product-image {
  width: 100%;
  height: 300px;
  background: var(--dark-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-image::before {
  content: '3D';
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--gold);
  color: var(--primary-black);
  padding: 5px 15px;
  font-size: 12px;
  font-weight: 700;
  border-radius: 3px;
}

.product-icon {
  font-size: 80px;
  color: var(--gold);
}

.product-info {
  padding: 30px;
}

.product-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--white);
}

.product-desc {
  color: var(--light-gray);
  font-size: 14px;
  line-height: 1.8;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-top: 80px;
}

.stat-item {
  text-align: center;
  padding: 40px 20px;
  background: var(--secondary-black);
  border: 1px solid var(--dark-gray);
  transition: var(--transition);
}

.stat-item:hover {
  border-color: var(--gold);
  transform: translateY(-5px);
}

.stat-number {
  font-size: 56px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 10px;
}

.stat-label {
  font-size: 16px;
  color: var(--light-gray);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-top: 60px;
}

.about-text h3 {
  font-size: 36px;
  margin-bottom: 30px;
  color: var(--gold);
}

.about-text p {
  font-size: 16px;
  color: var(--light-gray);
  line-height: 2;
  margin-bottom: 20px;
}

.about-image {
  width: 100%;
  height: 500px;
  background: var(--dark-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--medium-gray);
}

.about-image-icon {
  font-size: 120px;
  color: var(--gold);
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 60px;
}

.scenario-card {
  position: relative;
  height: 400px;
  background: var(--dark-gray);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
}

.scenario-card:hover {
  transform: scale(1.05);
}

.scenario-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, transparent 0%, rgba(10, 10, 10, 0.9) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 30px;
  transition: var(--transition);
}

.scenario-card:hover .scenario-overlay {
  background: linear-gradient(to bottom, rgba(201, 169, 97, 0.2) 0%, rgba(10, 10, 10, 0.95) 100%);
}

.scenario-icon {
  font-size: 60px;
  color: var(--gold);
  margin-bottom: 20px;
}

.scenario-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 10px;
}

.scenario-desc {
  font-size: 14px;
  color: var(--light-gray);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 60px;
}

.case-card {
  background: var(--secondary-black);
  border: 1px solid var(--dark-gray);
  overflow: hidden;
  transition: var(--transition);
}

.case-card:hover {
  border-color: var(--gold);
  transform: translateY(-5px);
}

.case-image {
  width: 100%;
  height: 250px;
  background: var(--dark-gray);
  display: flex;
  align-items: center;
  justify-content: center;
}

.case-icon {
  font-size: 80px;
  color: var(--gold);
}

.case-info {
  padding: 30px;
}

.case-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--white);
}

.case-meta {
  display: flex;
  gap: 20px;
  margin-bottom: 15px;
}

.case-meta-item {
  font-size: 13px;
  color: var(--gold);
}

.case-desc {
  font-size: 14px;
  color: var(--light-gray);
  line-height: 1.8;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 60px;
}

.news-card {
  background: var(--secondary-black);
  border: 1px solid var(--dark-gray);
  padding: 30px;
  transition: var(--transition);
}

.news-card:hover {
  border-color: var(--gold);
  transform: translateY(-5px);
}

.news-date {
  font-size: 13px;
  color: var(--gold);
  margin-bottom: 15px;
}

.news-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--white);
  line-height: 1.4;
}

.news-excerpt {
  font-size: 14px;
  color: var(--light-gray);
  line-height: 1.8;
}

.dealer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-top: 60px;
}

.dealer-benefits {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.benefit-card {
  background: var(--secondary-black);
  border: 1px solid var(--dark-gray);
  padding: 30px;
  transition: var(--transition);
}

.benefit-card:hover {
  border-color: var(--gold);
}

.benefit-icon {
  font-size: 40px;
  color: var(--gold);
  margin-bottom: 20px;
}

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

.benefit-desc {
  font-size: 14px;
  color: var(--light-gray);
  line-height: 1.8;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-top: 60px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.contact-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.contact-icon {
  font-size: 30px;
  color: var(--gold);
  flex-shrink: 0;
}

.contact-text h4 {
  font-size: 18px;
  margin-bottom: 5px;
  color: var(--white);
}

.contact-text p {
  font-size: 14px;
  color: var(--light-gray);
  line-height: 1.6;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 14px;
  color: var(--white);
  font-weight: 500;
}

.form-input,
.form-textarea {
  padding: 15px;
  background: var(--secondary-black);
  border: 1px solid var(--dark-gray);
  color: var(--white);
  font-size: 14px;
  transition: var(--transition);
  font-family: inherit;
}

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

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

.submit-btn {
  padding: 16px 48px;
  background: var(--gold);
  color: var(--primary-black);
  border: 2px solid var(--gold);
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: var(--transition);
  align-self: flex-start;
}

.submit-btn:hover {
  background: transparent;
  color: var(--gold);
}

.footer {
  background: var(--secondary-black);
  border-top: 1px solid var(--dark-gray);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand h3 {
  font-size: 28px;
  color: var(--gold);
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--light-gray);
  line-height: 1.8;
}

.footer-section h4 {
  font-size: 16px;
  color: var(--white);
  margin-bottom: 20px;
  font-weight: 600;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--light-gray);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--gold);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--dark-gray);
  color: var(--light-gray);
  font-size: 14px;
}

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

@media (max-width: 1024px) {
  .nav-menu {
    gap: 20px;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about-content,
  .dealer-content,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    flex-direction: column;
    background: var(--secondary-black);
    width: 100%;
    padding: 40px 20px;
    transition: var(--transition);
    border-bottom: 1px solid var(--dark-gray);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .hero-title {
    font-size: 48px;
  }
  
  .hero-subtitle {
    font-size: 18px;
  }
  
  .section-title {
    font-size: 36px;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .products-grid,
  .scenarios-grid,
  .cases-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .dealer-benefits {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gold);
  color: var(--primary-black);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  display: flex;
}

.back-to-top:hover {
  background: var(--gold-light);
  transform: translateY(-5px);
}