/* 全局CSS变量 */
:root {
  --color-ivory: #faf9f6;
  --color-light-gray: #e5e5e5;
  --color-gray: #9e9e9e;
  --color-dark-gray: #4a4a4a;
  --color-charcoal: #2c2c2c;
  --color-accent: #c9ada7;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 重置和基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--color-ivory);
  color: var(--color-dark-gray);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 导航菜单 */
.nav-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(250, 249, 246, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-light-gray);
}

nav {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-lg);
}

nav a {
  text-decoration: none;
  color: var(--color-dark-gray);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  position: relative;
  transition: var(--transition-smooth);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-dark-gray);
  transition: var(--transition-smooth);
}

nav a:hover {
  color: var(--color-charcoal);
}

nav a:hover::after {
  width: 100%;
}

nav a.active {
  color: var(--color-charcoal);
  font-weight: 600;
}

nav a.active::after {
  width: 100%;
}

/* 主内容区域 */
main {
  margin-top: 70px;
}

/* 全屏轮播图容器 */
.hero-slider {
  position: relative;
  width: 100%;
  height: 90vh;
  overflow: hidden;
  background-color: var(--color-light-gray);
}

.slider-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
}

.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;
  object-position: center;
}

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

.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.slider-dot.active {
  background-color: rgba(255, 255, 255, 0.9);
  transform: scale(1.2);
}

/* 精选辑区域 */
.featured-section {
  max-width: 1400px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-lg);
  color: var(--color-charcoal);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.featured-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3/4;
  background-color: var(--color-light-gray);
}

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

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

.featured-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  color: white;
  transform: translateY(100%);
  transition: var(--transition-smooth);
}

.featured-item:hover .featured-caption {
  transform: translateY(0);
}

.featured-caption h3 {
  font-size: 1.2rem;
  font-weight: 400;
  margin-bottom: var(--spacing-xs);
}

.featured-caption p {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* 探索更多按钮 */
.explore-more {
  text-align: center;
  margin: var(--spacing-xl) 0;
}

.explore-more a {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  color: var(--color-dark-gray);
  border: 1px solid var(--color-gray);
  letter-spacing: 0.1em;
  transition: var(--transition-smooth);
}

.explore-more a:hover {
  background-color: var(--color-dark-gray);
  color: var(--color-ivory);
  border-color: var(--color-dark-gray);
}

/* 系列展示页 */
.collection-intro {
  max-width: 800px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
  text-align: center;
}

.collection-intro p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-gray);
}

.collection-grid {
  max-width: 1400px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.collection-item {
  position: relative;
  overflow: hidden;
  background-color: var(--color-light-gray);
  aspect-ratio: 3/4;
}

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

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

.collection-tag {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: rgba(255, 255, 255, 0.9);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-charcoal);
}

.collection-desc {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: white;
  font-size: 0.9rem;
  opacity: 0;
  transition: var(--transition-smooth);
}

.collection-item:hover .collection-desc {
  opacity: 1;
}

/* 设计理念页 */
.philosophy-intro {
  max-width: 900px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
  text-align: center;
}

.philosophy-intro h2 {
  font-size: 2.5rem;
  font-weight: 300;
  margin-bottom: var(--spacing-md);
  color: var(--color-charcoal);
}

.philosophy-intro p {
  font-size: 1.2rem;
  line-height: 1.9;
  color: var(--color-gray);
}

.principle-section {
  max-width: 1200px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
}

.principle-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  align-items: center;
}

.principle-item:nth-child(even) {
  direction: rtl;
}

.principle-item:nth-child(even) > * {
  direction: ltr;
}

.principle-image {
  width: 100%;
  height: 500px;
  overflow: hidden;
  background-color: var(--color-light-gray);
}

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

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

.principle-content h3 {
  font-size: 1.8rem;
  font-weight: 400;
  margin-bottom: var(--spacing-sm);
  color: var(--color-charcoal);
}

.principle-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-gray);
}

.sustainability {
  max-width: 800px;
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-lg);
  text-align: center;
  background-color: rgba(229, 229, 229, 0.3);
  border-left: 3px solid var(--color-accent);
}

.sustainability p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-gray);
  font-style: italic;
}

/* 页脚 */
footer {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  margin-top: var(--spacing-xl);
  border-top: 1px solid var(--color-light-gray);
  color: var(--color-gray);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  width: 50px;
  height: 50px;
  background-color: var(--color-dark-gray);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--color-charcoal);
  transform: translateY(-3px);
}

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

  nav a {
    font-size: 0.9rem;
  }

  .hero-slider {
    height: 70vh;
  }

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

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

  .collection-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
  }

  .principle-item {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .principle-item:nth-child(even) {
    direction: ltr;
  }

  .principle-image {
    height: 350px;
  }

  .philosophy-intro h2 {
    font-size: 1.8rem;
  }

  .philosophy-intro p {
    font-size: 1rem;
  }

  .principle-content h3 {
    font-size: 1.4rem;
  }

  .principle-content p {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
  }

  nav {
    gap: var(--spacing-sm);
  }

  nav a {
    font-size: 0.85rem;
  }

  .section-title {
    font-size: 1.3rem;
  }

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

/* 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;
}