/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* CSS变量定义 */
:root {
  --color-primary-light: #F8F9FA;
  --color-primary-white: #FFFFFF;
  --color-secondary-beige: #F5F1EA;
  --color-secondary-pink: #F8E8E8;
  --color-accent-charcoal: #2C3E50;
  --color-accent-terracotta: #B35441;
  --color-text-dark: #333333;
  --color-text-medium: #666666;
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 48px;
  --spacing-xl: 64px;
  --transition-fast: 0.3s ease;
  --transition-medium: 0.5s ease;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-primary-light);
  color: var(--color-text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

html {
  scroll-behavior: smooth;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--color-primary-white);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-fast);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.navbar-logo {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-accent-charcoal);
}

.navbar-menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.navbar-menu a {
  font-size: 16px;
  color: var(--color-text-medium);
  transition: color var(--transition-fast);
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: var(--color-accent-terracotta);
}

/* 主容器 */
.main-container {
  margin-top: 80px;
}

/* 轮播容器 */
.hero-carousel {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.carousel-track {
  display: flex;
  transition: transform var(--transition-medium);
  height: 100%;
}

.carousel-slide {
  min-width: 100%;
  height: 100%;
  position: relative;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-caption {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-primary-white);
  font-size: 36px;
  font-weight: 300;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  letter-spacing: 2px;
}

.carousel-dots {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-sm);
  z-index: 10;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.carousel-dot.active {
  background: var(--color-primary-white);
  width: 30px;
  border-radius: 5px;
}

/* 板块容器 */
.section {
  padding: var(--spacing-xl) var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  font-size: 28px;
  font-weight: 400;
  color: var(--color-accent-charcoal);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  letter-spacing: 1px;
}

/* 图片网格 */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.image-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  border-radius: 2px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.image-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.image-card img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  transition: transform var(--transition-medium);
}

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

.image-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  padding: var(--spacing-md);
  color: var(--color-primary-white);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.image-overlay-title {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: var(--spacing-xs);
}

.image-overlay-desc {
  font-size: 14px;
  opacity: 0.9;
}

/* 侧边导航 */
.sidebar-nav {
  position: fixed;
  left: 0;
  top: 120px;
  width: 250px;
  padding: var(--spacing-md);
  background: var(--color-primary-white);
  box-shadow: var(--shadow-sm);
  border-radius: 0 4px 4px 0;
}

.sidebar-nav ul {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: var(--spacing-sm);
}

.sidebar-nav a {
  display: block;
  padding: var(--spacing-sm);
  color: var(--color-text-medium);
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: var(--color-accent-terracotta);
  border-left-color: var(--color-accent-terracotta);
  background: var(--color-secondary-pink);
}

/* 内容区域 */
.content-area {
  margin-left: 280px;
  padding: var(--spacing-lg);
}

/* 设计理念页面布局 */
.philosophy-container {
  display: flex;
  min-height: calc(100vh - 80px);
}

.philosophy-text {
  flex: 1;
  padding: var(--spacing-xl);
  background: var(--color-primary-white);
  overflow-y: auto;
}

.philosophy-section {
  margin-bottom: var(--spacing-xl);
}

.philosophy-section h2 {
  font-size: 24px;
  font-weight: 400;
  color: var(--color-accent-charcoal);
  margin-bottom: var(--spacing-md);
  letter-spacing: 1px;
}

.philosophy-section p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-medium);
  text-align: justify;
}

.philosophy-image {
  flex: 1;
  background-size: cover;
  background-position: center;
  position: sticky;
  top: 80px;
  height: calc(100vh - 80px);
}

/* 页脚 */
.footer {
  background: var(--color-primary-white);
  padding: var(--spacing-lg);
  text-align: center;
  border-top: 1px solid var(--color-secondary-beige);
}

.footer-text {
  font-size: 14px;
  color: var(--color-text-medium);
  margin-bottom: var(--spacing-xs);
}

.footer-copyright {
  font-size: 14px;
  color: var(--color-text-medium);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .navbar-menu {
    gap: var(--spacing-md);
  }

  .navbar-menu a {
    font-size: 14px;
  }

  .carousel-caption {
    font-size: 24px;
    bottom: var(--spacing-lg);
  }

  .section {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .section-title {
    font-size: 22px;
  }

  .image-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .image-card img {
    height: 350px;
  }

  .sidebar-nav {
    position: static;
    width: 100%;
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
  }

  .content-area {
    margin-left: 0;
    padding: var(--spacing-md);
  }

  .philosophy-container {
    flex-direction: column;
  }

  .philosophy-image {
    position: static;
    height: 400px;
  }

  .philosophy-text {
    padding: var(--spacing-md);
  }
}

/* 加载动画 */
.loading {
  opacity: 0;
  animation: fadeIn var(--transition-medium) forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

/* 图片懒加载占位 */
.lazy-img {
  background: var(--color-secondary-beige);
  min-height: 450px;
}