/* 全局重置与基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-white: #FFFFFF;
  --color-light-gray: #F5F5F7;
  --color-dark-gray: #2C2C2C;
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-sand: #E0D3B8;
  --color-deep-blue: #1D3461;
  --color-terracotta: #A24936;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s ease;
  --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Source Han Sans CN", "Noto Sans CJK SC", sans-serif;
  background-color: var(--color-white);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 1.5rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.logo {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 3rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  position: relative;
  transition: var(--transition-fast);
}

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

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

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

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

/* 轮播图 */
.hero-slider {
  position: relative;
  height: 90vh;
  overflow: hidden;
}

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

.slide.active {
  opacity: 1;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.85);
}

.slide-caption {
  position: absolute;
  bottom: 10%;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--color-white);
  z-index: 10;
}

.slide-caption h2 {
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 3px;
  margin-bottom: 1rem;
}

/* 区块标题 */
.section {
  padding: 5rem 5%;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 4px;
  margin-bottom: 3rem;
  color: var(--color-text-primary);
}

.section-subtitle {
  text-align: center;
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-top: -2rem;
  margin-bottom: 4rem;
}

/* 卡片网格 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-smooth);
}

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

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

.card-content {
  padding: 1.5rem;
  background-color: var(--color-white);
}

.card-title {
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.card-description {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

/* 特色展示区 */
.feature-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  max-width: 1400px;
  margin: 0 auto;
  align-items: center;
}

.feature-images {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.feature-images img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.feature-images img:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-soft);
}

.feature-content h3 {
  font-size: 1.8rem;
  font-weight: 300;
  margin-bottom: 1.5rem;
  letter-spacing: 2px;
}

.feature-content p {
  color: var(--color-text-secondary);
  line-height: 2;
  font-size: 1rem;
}

/* 图片网格 */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

.grid-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3/4;
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.grid-item:hover img {
  transform: scale(1.08);
}

.grid-item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  padding: 2rem 1.5rem;
  opacity: 0;
  transition: var(--transition-smooth);
}

.grid-item:hover .grid-item-overlay {
  opacity: 1;
}

.grid-item-overlay p {
  color: var(--color-white);
  font-size: 0.95rem;
}

/* 分类标签 */
.filter-tags {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-tag {
  padding: 0.8rem 2rem;
  border: 1px solid var(--color-text-secondary);
  background-color: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 0.9rem;
  letter-spacing: 1px;
}

.filter-tag:hover,
.filter-tag.active {
  background-color: var(--color-text-primary);
  color: var(--color-white);
  border-color: var(--color-text-primary);
}

/* 系列展示 */
.series-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 3rem;
  max-width: 1400px;
  margin: 4rem auto;
}

.series-item {
  text-align: center;
}

.series-item img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  margin-bottom: 1.5rem;
  transition: var(--transition-smooth);
}

.series-item:hover img {
  box-shadow: var(--shadow-hover);
}

.series-item h4 {
  font-size: 1.3rem;
  font-weight: 400;
  margin-bottom: 0.8rem;
  letter-spacing: 2px;
}

.series-item p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* 核心理念 */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

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

.philosophy-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  color: var(--color-sand);
}

.philosophy-item h4 {
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: 1rem;
  letter-spacing: 1px;
}

.philosophy-item p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* 详细阐述 */
.detail-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  max-width: 1400px;
  margin: 4rem auto;
  align-items: center;
}

.detail-image img {
  width: 100%;
  height: 600px;
  object-fit: cover;
}

.detail-text h3 {
  font-size: 1.8rem;
  font-weight: 300;
  margin-bottom: 1.5rem;
  letter-spacing: 2px;
}

.detail-text p {
  color: var(--color-text-secondary);
  line-height: 2;
  font-size: 1rem;
}

/* 时间轴 */
.timeline {
  position: relative;
  max-width: 1200px;
  margin: 4rem auto;
  padding: 2rem 0;
}

.timeline-items {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  overflow-x: auto;
}

.timeline-item {
  flex: 1;
  min-width: 200px;
  text-align: center;
}

.timeline-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  margin-bottom: 1rem;
  transition: var(--transition-smooth);
}

.timeline-item:hover img {
  transform: translateY(-5px);
  box-shadow: var(--shadow-soft);
}

.timeline-item h5 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.timeline-item p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* 模态框 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  justify-content: center;
  align-items: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  position: relative;
  max-width: 90%;
  max-height: 90%;
}

.modal-content img {
  width: 100%;
  height: auto;
  max-height: 90vh;
  object-fit: contain;
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 40px;
  font-size: 3rem;
  color: var(--color-white);
  cursor: pointer;
  background: none;
  border: none;
}

/* 页脚 */
.footer {
  background-color: var(--color-light-gray);
  padding: 3rem 5%;
  text-align: center;
  margin-top: 5rem;
}

.footer p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 2;
}

/* 淡入动画 */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    padding: 1rem 3%;
  }

  .nav-links {
    gap: 1.5rem;
  }

  .slide-caption h2 {
    font-size: 1.8rem;
  }

  .section {
    padding: 3rem 3%;
  }

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

  .card-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .feature-showcase {
    grid-template-columns: 1fr;
  }

  .feature-images {
    order: 2;
  }

  .detail-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .timeline-items {
    flex-direction: column;
  }

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

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

  .philosophy-grid {
    grid-template-columns: 1fr;
  }
}