/* 全局变量 */
:root {
  --primary-color: #ff6b6b;
  --secondary-color: #4ecdc4;
  --accent-color: #ffd93d;
  --text-dark: #2d3436;
  --text-light: #636e72;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.16);
  --transition: all 0.3s ease;
  --border-radius: 12px;
}

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-dark);
  background: var(--bg-light);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* 导航栏 */
.navbar {
  background: var(--bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 1rem 0;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-links a {
  font-weight: 500;
  color: var(--text-dark);
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.cart-icon {
  position: relative;
  font-size: 1.5rem;
}

.cart-count {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--primary-color);
  color: white;
  font-size: 0.75rem;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
}

/* Hero 轮播 */
.hero-slider {
  position: relative;
  overflow: hidden;
  height: 500px;
}

.hero-slide {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.6s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-slide.active {
  opacity: 1;
}

.hero-content {
  text-align: center;
  color: white;
  z-index: 1;
  padding: 2rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.hero-cta {
  background: white;
  color: var(--text-dark);
  padding: 1rem 3rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 50px;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

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

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.9);
  color: var(--text-dark);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 10;
}

.slider-btn:hover {
  background: white;
  transform: translateY(-50%) scale(1.1);
}

.slider-btn.prev { left: 2rem; }
.slider-btn.next { right: 2rem; }

.slider-dots {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.75rem;
  z-index: 10;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: var(--transition);
}

.dot.active {
  background: white;
  transform: scale(1.2);
}

/* 分类网格 */
.section {
  padding: 4rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--text-dark);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.category-card {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: var(--border-radius);
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.category-card:hover, .category-card.active {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.category-card:hover *, .category-card.active * {
  color: white;
}

.category-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 0.75rem;
}

.category-name {
  font-weight: 600;
  color: var(--text-dark);
}

/* 产品网格 */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--bg-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}

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

.product-image-container {
  position: relative;
  overflow: hidden;
  height: 320px;
}

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

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

.featured-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: var(--accent-color);
  color: var(--text-dark);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.product-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  padding: 2rem 1rem 1rem;
  opacity: 0;
  transition: var(--transition);
}

.product-card:hover .product-overlay {
  opacity: 1;
}

.quick-add-btn {
  background: var(--bg-white);
  color: var(--text-dark);
  padding: 0.75rem 1.5rem;
  border-radius: 25px;
  font-weight: 600;
  width: 100%;
  transition: var(--transition);
}

.quick-add-btn:hover {
  background: var(--primary-color);
  color: white;
}

.product-info {
  padding: 1.5rem;
}

.product-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.product-category {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.product-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

/* 信任标识 */
.trust-badges {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  background: var(--bg-white);
  padding: 3rem;
  border-radius: var(--border-radius);
  margin-top: 3rem;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.trust-icon {
  font-size: 3rem;
}

.trust-content h4 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.trust-content p {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  background: var(--text-dark);
  color: white;
  padding: 4rem 2rem 2rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h3 {
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
  color: var(--accent-color);
}

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

.footer-section li {
  margin-bottom: 0.75rem;
}

.footer-section a {
  color: #ddd;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--primary-color);
}

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

/* 通知样式 */
.notification {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--primary-color);
  color: white;
  padding: 1rem 2rem;
  border-radius: 50px;
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  transition: var(--transition);
  z-index: 2000;
}

.notification.show {
  transform: translateY(0);
  opacity: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 1rem 2rem;
    box-shadow: var(--shadow-md);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .slider-btn {
    width: 40px;
    height: 40px;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
}

@media (max-width: 480px) {
  .hero-slider {
    height: 400px;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .section {
    padding: 2rem 1rem;
  }
  
  .product-image-container {
    height: 280px;
  }
}