/* 自定义设计令牌 */
:root {
  --color-primary: #f5f5f0;
  --color-secondary: #e8e8e3;
  --color-accent-1: #8b3a3a;
  --color-accent-2: #2d4a2b;
  --color-accent-3: #1e3a5f;
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-text-light: #999999;
  --font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
}

/* 全局基础样式 */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 导航栏样式 */
.navbar {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-link {
  color: var(--color-text-primary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--color-accent-1);
}

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 50%;
  background-color: var(--color-accent-1);
  transition: all 0.3s ease;
}

.nav-link:hover::after {
  width: 80%;
  left: 10%;
}

/* 内容区域 */
.content-section {
  padding: 4rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* 卡片样式 */
.card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, transparent 0%, rgba(0, 0, 0, 0.7) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
}

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

/* 网格布局 */
.grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* 轮播图容器 */
.hero-carousel {
  position: relative;
  height: 70vh;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.carousel-slide {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

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

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  background-color: var(--color-accent-1);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  font-size: 1rem;
}

.btn:hover {
  background-color: #6d2f2f;
  transform: translateY(-2px);
}

/* 文本样式 */
.text-heading {
  font-size: 2.5rem;
  font-weight: 300;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.text-subheading {
  font-size: 1.5rem;
  font-weight: 300;
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
}

.text-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.text-caption {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* 系法步骤样式 */
.step-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.step-number {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  background-color: var(--color-accent-2);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 1rem;
  font-weight: 500;
}

/* 材质卡片样式 */
.material-card {
  padding: 3rem;
  background: linear-gradient(135deg, var(--color-secondary) 0%, white 100%);
  border-radius: var(--radius-lg);
  margin-bottom: 2rem;
}

/* 页脚样式 */
.footer {
  background-color: var(--color-text-primary);
  color: white;
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .content-section {
    padding: 2rem 1rem;
  }
  
  .text-heading {
    font-size: 2rem;
  }
  
  .text-subheading {
    font-size: 1.25rem;
  }
  
  .hero-carousel {
    height: 50vh;
  }
  
  .grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .material-card {
    padding: 2rem;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 0.5rem;
  }
  
  .nav-link {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
  }
  
  .hero-carousel {
    height: 40vh;
  }
  
  .content-section {
    padding: 1.5rem 0.75rem;
  }
}

/* 加载动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-accent-1);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #6d2f2f;
}