/* 全局样式重置与基础配置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-ivory: #faf9f7;
  --color-light-gray: #e8e6e3;
  --color-oatmeal: #f5f1ed;
  --color-dark-gray: #333333;
  --color-charcoal: #1a1a1a;
  --color-accent: #8b7355;
  --font-primary: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --spacing-unit: 1rem;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: var(--font-primary);
  color: var(--color-dark-gray);
  background-color: var(--color-ivory);
  line-height: 1.8;
  font-size: 16px;
  overflow-x: hidden;
}

/* 导航栏样式 */
.nav-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(250, 249, 247, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--color-light-gray);
}

.nav-wrapper {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
}

.nav-link {
  color: var(--color-dark-gray);
  text-decoration: none;
  font-size: 1rem;
  letter-spacing: 0.05em;
  transition: var(--transition-smooth);
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition-smooth);
}

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

/* 主容器 */
.main-container {
  margin-top: 80px;
  min-height: calc(100vh - 160px);
}

/* 全屏轮播区域 */
.hero-slider {
  position: relative;
  width: 100%;
  height: 85vh;
  overflow: hidden;
}

.slider-item {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slider-item.active {
  opacity: 1;
}

.slider-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.slider-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.3) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.slider-text {
  color: #ffffff;
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  text-align: center;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* 内容区块 */
.content-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-charcoal);
  text-align: center;
  margin-bottom: 3rem;
  letter-spacing: 0.1em;
}

.section-text {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-dark-gray);
  margin-bottom: 2rem;
  text-align: justify;
}

/* 图片网格布局 */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.image-item {
  position: relative;
  overflow: hidden;
  border-radius: 2px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: var(--transition-smooth);
}

.image-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.image-item img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  display: block;
  transition: var(--transition-smooth);
}

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

/* 系列展示 */
.series-container {
  margin: 4rem 0;
}

.series-item {
  margin-bottom: 5rem;
}

.series-title {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-charcoal);
  margin-bottom: 1.5rem;
  letter-spacing: 0.08em;
}

.series-description {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-dark-gray);
  margin-bottom: 2rem;
}

.series-images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* 按钮样式 */
.btn-group {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 3rem 0;
}

.btn {
  padding: 1rem 2.5rem;
  background: transparent;
  border: 1px solid var(--color-dark-gray);
  color: var(--color-dark-gray);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  transition: var(--transition-smooth);
  cursor: pointer;
}

.btn:hover {
  background: var(--color-dark-gray);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* 页脚 */
.footer {
  background: var(--color-oatmeal);
  padding: 2rem;
  text-align: center;
  border-top: 1px solid var(--color-light-gray);
}

.footer-text {
  color: var(--color-dark-gray);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-wrapper {
    gap: 1.5rem;
  }

  .nav-link {
    font-size: 0.9rem;
  }

  .slider-text {
    font-size: 1.5rem;
  }

  .content-section {
    padding: 3rem 1.5rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .image-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .series-images {
    grid-template-columns: 1fr;
  }

  .btn-group {
    flex-direction: column;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .hero-slider {
    height: 60vh;
  }

  .slider-text {
    font-size: 1.2rem;
  }

  .image-item img {
    height: 300px;
  }
}

/* 懒加载动画 */
.lazy-load {
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-smooth);
}

.lazy-load.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}