/* 基础重置和全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #4a90e2;
  --secondary-color: #ffcc00;
  --accent-color: #e74c3c;
  --light-color: #f8f9fa;
  --dark-color: #2c3e50;
  --success-color: #2ecc71;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1.6;
  color: var(--dark-color);
  overflow-x: hidden;
}

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

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1rem 0;
  box-shadow: var(--shadow);
}

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

.logo h2 {
  color: var(--primary-color);
  font-family: 'Playfair Display', serif;
  font-weight: 700;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-menu a {
  text-decoration: none;
  color: var(--dark-color);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

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

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

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--dark-color);
  margin: 3px 0;
  transition: var(--transition);
}

/* 主页横幅样式 */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%234a90e2' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

.hero-content {
  flex: 1;
  padding: 0 2rem;
  z-index: 2;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  color: var(--dark-color);
  margin-bottom: 1rem;
  font-family: 'Playfair Display', serif;
  line-height: 1.2;
  background: linear-gradient(45deg, var(--primary-color), var(--dark-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--dark-color);
  margin-bottom: 2rem;
  max-width: 600px;
  opacity: 0.8;
}

.cta-button {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 1rem 2rem;
  font-size: 1.1rem;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
}

.cta-button:hover {
  background: #357abd;
  transform: translateY(-3px);
  box-shadow: 0 15px 30px rgba(74, 144, 226, 0.3);
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 2rem;
}

.hero-image img {
  max-width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* 特色功能样式 */
.features {
  padding: 6rem 0;
  background: white;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 4rem;
  font-family: 'Playfair Display', serif;
  color: var(--dark-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 0 2rem;
}

.feature-card {
  background: white;
  padding: 2rem;
  border-radius: var(--border-radius);
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid #eee;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.feature-card p {
  color: #666;
  line-height: 1.6;
}

/* 产品介绍样式 */
.products {
  padding: 6rem 0;
  background: linear-gradient(to bottom, #f8f9fa 0%, #e9ecef 100%);
}

.product-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 0 2rem;
}

.product-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
  transition: var(--transition);
}

.product-card.featured {
  border: 3px solid var(--secondary-color);
  transform: scale(1.05);
}

.product-card.featured:hover {
  transform: scale(1.08);
}

.popular-tag {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--secondary-color);
  color: var(--dark-color);
  padding: 0.3rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
}

.product-header {
  margin-bottom: 1.5rem;
}

.product-header h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--dark-color);
}

.price {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
}

.price span {
  font-size: 1rem;
  color: #666;
}

.features-list {
  list-style: none;
  margin-bottom: 2rem;
}

.features-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid #eee;
  color: #555;
}

.features-list li:last-child {
  border-bottom: none;
}

.select-btn {
  width: 100%;
  padding: 1rem;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.select-btn.primary {
  background: var(--primary-color);
  color: white;
}

.select-btn:not(.primary) {
  background: #f8f9fa;
  color: var(--dark-color);
  border: 1px solid #ddd;
}

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

/* 核心优势样式 */
.benefits {
  padding: 6rem 0;
  background: white;
}

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

.benefit-item {
  text-align: center;
  padding: 2rem;
}

.benefit-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.benefit-item h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.benefit-item p {
  color: #666;
  line-height: 1.6;
}

/* 联系我们样式 */
.contact {
  padding: 6rem 0;
  background: linear-gradient(135deg, var(--primary-color), #357abd);
  color: white;
}

.contact .section-title {
  color: white;
}

.contact-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  padding: 0 2rem;
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.contact-info p {
  margin-bottom: 2rem;
  opacity: 0.9;
}

.contact-details p {
  margin-bottom: 0.8rem;
  font-size: 1.1rem;
}

.contact-form {
  background: rgba(255, 255, 255, 0.1);
  padding: 2rem;
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.8rem;
  margin-bottom: 1rem;
  border: none;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.9);
}

.submit-btn {
  width: 100%;
  padding: 1rem;
  background: white;
  color: var(--primary-color);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.submit-btn:hover {
  background: var(--light-color);
  transform: translateY(-2px);
}

/* 页脚样式 */
.footer {
  background: var(--dark-color);
  color: white;
  text-align: center;
  padding: 2rem 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    display: none;
  }

  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 120px;
  }

  .hero-content {
    margin-bottom: 2rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .features-grid,
  .product-cards,
  .benefits-grid {
    grid-template-columns: 1fr;
  }

  .product-card.featured {
    transform: scale(1);
  }

  .product-card.featured:hover {
    transform: scale(1.02);
  }

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

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .price {
    font-size: 1.5rem;
  }
}