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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, sans-serif;
  color: #333;
  line-height: 1.6;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
  transition: all 0.3s;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.98);
  box-shadow: 0 2px 30px rgba(0,0,0,0.12);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #1a237e;
  font-size: 24px;
  font-weight: 700;
}

.nav-logo img {
  height: 40px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 35px;
}

.nav-links a {
  text-decoration: none;
  color: #333;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.3s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: #1a237e;
  transition: width 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
  color: #1a237e;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

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

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: #333;
  transition: all 0.3s;
}

/* Hero Section */
.hero {
  height: 100vh;
  min-height: 600px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
  overflow: hidden;
}

.hero-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(26,35,126,0.85) 0%, rgba(0,0,0,0.7) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 20px;
}

.hero-content h1 {
  font-size: 52px;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.hero-content p {
  font-size: 20px;
  margin-bottom: 30px;
  opacity: 0.9;
}

.hero-btn {
  display: inline-block;
  padding: 14px 40px;
  background: #ff6f00;
  color: #fff;
  text-decoration: none;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s;
}

.hero-btn:hover {
  background: #e65100;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255,111,0,0.3);
}

/* Sections */
.section {
  padding: 100px 20px;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 36px;
  color: #1a237e;
  margin-bottom: 15px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: #ff6f00;
  margin: 15px auto 0;
}

.section-title p {
  color: #666;
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

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

/* About Section */
.about {
  background: #f8f9fa;
}

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

.about-image {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  display: block;
}

.about-text h3 {
  font-size: 28px;
  color: #1a237e;
  margin-bottom: 20px;
}

.about-text p {
  color: #555;
  margin-bottom: 15px;
  font-size: 15px;
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.stat-item {
  text-align: center;
  padding: 20px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.stat-item .number {
  font-size: 32px;
  font-weight: 700;
  color: #ff6f00;
}

.stat-item .label {
  font-size: 13px;
  color: #888;
  margin-top: 5px;
}

/* Products Section */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.product-card {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  transition: all 0.4s;
  text-decoration: none;
  color: inherit;
  display: block;
  height: 250px;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}

.product-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s;
}

.product-card:hover img {
  transform: scale(1.1);
}

.product-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  color: #fff;
}

.product-info h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.product-info p {
  font-size: 12px;
  opacity: 0.85;
}

/* Cases Section */
.cases {
  background: #f8f9fa;
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.case-item {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  background: #fff;
  transition: all 0.4s;
  text-decoration: none;
  color: inherit;
  display: block;
}

.case-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.12);
}

.case-item img,
.case-item video {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.case-body {
  padding: 16px;
}

.case-body h4 {
  font-size: 14px;
  color: #1a237e;
  margin-bottom: 4px;
}

.case-body p {
  font-size: 12px;
  color: #999;
}

/* Contact Section */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}

.contact-info h3 {
  font-size: 24px;
  color: #1a237e;
  margin-bottom: 25px;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 20px;
}

.contact-detail .icon {
  width: 44px;
  height: 44px;
  background: #e8eaf6;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #1a237e;
  flex-shrink: 0;
}

.contact-detail .text h4 {
  font-size: 15px;
  margin-bottom: 3px;
}

.contact-detail .text p {
  font-size: 14px;
  color: #666;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  margin-bottom: 15px;
  transition: border-color 0.3s;
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: #1a237e;
}

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

.contact-form button {
  padding: 14px 35px;
  background: #1a237e;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.contact-form button:hover {
  background: #283593;
  transform: translateY(-2px);
}

/* WeChat QR */
.contact-detail.wechat {
  position: relative;
  cursor: pointer;
}

.wechat-qr {
  position: absolute;
  left: 0;
  top: 100%;
  width: 160px;
  padding: 8px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s;
  z-index: 10;
}

.contact-detail.wechat:hover .wechat-qr {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.wechat-qr img {
  width: 100%;
  display: block;
  border-radius: 4px;
}

/* Footer */
.footer {
  background: #1a237e;
  color: #fff;
  padding: 50px 20px 20px;
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 30px;
}

.footer-qr img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 8px;
  display: block;
}

.footer h3 {
  font-size: 18px;
  margin-bottom: 15px;
  color: #ff6f00;
}

.footer p,
.footer a {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  line-height: 2;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: #ff6f00;
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 999;
}

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

.back-to-top:hover {
  background: #e65100;
  transform: translateY(-3px);
}

/* Responsive */
@media (max-width: 1200px) {
  .products-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .cases-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 992px) {
  .about-content {
    grid-template-columns: 1fr;
  }
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-content {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateY(-100%);
    opacity: 0;
    transition: all 0.3s;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
  }
  .hero-content h1 {
    font-size: 32px;
  }
  .hero-content p {
    font-size: 16px;
  }
  .section-title h2 {
    font-size: 28px;
  }
  .products-grid {
    grid-template-columns: 1fr;
  }
  .cases-grid {
    grid-template-columns: 1fr;
  }
  .about-stats {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}