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

:root {
  --color-ivory: #faf9f6;
  --color-gray: #9e9e9e;
  --color-beige: #e8dcc4;
  --color-charcoal: #4a4a4a;
  --color-soft-pink: #d4b5b0;
  --color-overlay: rgba(0, 0, 0, 0.4);
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* 通用容器 */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* 页面淡入淡出动画 */
.page-transition {
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 头部导航 */
.main-header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 2rem;
  z-index: 100;
  background: linear-gradient(to bottom, rgba(250, 249, 246, 0.95), transparent);
}

.site-title {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 0.3em;
  text-align: center;
  color: var(--color-charcoal);
}

/* 首页轮播 */
.hero-slider {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

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

.slide.active {
  opacity: 1;
}

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

.slide-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-text {
  color: white;
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-align: center;
}

/* 入口导航区 */
.entrance-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: -20vh;
  position: relative;
  z-index: 10;
}

.nav-item {
  position: relative;
  height: 50vh;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.nav-item:hover {
  transform: scale(1.03);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

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

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

.nav-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.nav-item:hover .nav-overlay {
  background: rgba(0, 0, 0, 0.5);
}

.nav-title {
  color: white;
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 0.3em;
}

/* 内页布局 */
.page-content {
  padding: 8rem 0 4rem;
  min-height: 100vh;
}

.page-header {
  text-align: center;
  margin-bottom: 4rem;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.3em;
  margin-bottom: 1rem;
}

.page-subtitle {
  font-size: 1.2rem;
  color: var(--color-gray);
  font-weight: 300;
  letter-spacing: 0.1em;
}

/* 轮廓美学布局 */
.silhouette-section {
  margin-bottom: 6rem;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
  color: var(--color-charcoal);
}

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

.silhouette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.silhouette-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.silhouette-item img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  transition: var(--transition-smooth);
}

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

/* 材质故事布局 */
.material-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.material-item {
  text-align: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.material-item:hover {
  transform: translateY(-8px);
}

.material-image {
  width: 100%;
  height: 400px;
  object-fit: cover;
  margin-bottom: 1.5rem;
  transition: var(--transition-smooth);
}

.material-item:hover .material-image {
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.material-title {
  font-size: 1.3rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  margin-bottom: 0.8rem;
}

.material-desc {
  font-size: 0.95rem;
  color: var(--color-gray);
  line-height: 1.8;
}

/* 底部导航 */
.page-navigation {
  position: fixed;
  bottom: 0;
  width: 100%;
  background: rgba(250, 249, 246, 0.98);
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: center;
  gap: 3rem;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  z-index: 100;
}

.nav-link {
  color: var(--color-charcoal);
  text-decoration: none;
  font-size: 1rem;
  letter-spacing: 0.2em;
  transition: var(--transition-smooth);
  position: relative;
}

.nav-link:hover {
  color: var(--color-soft-pink);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-soft-pink);
  transition: var(--transition-smooth);
}

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

.nav-link.disabled {
  color: var(--color-gray);
  cursor: default;
  pointer-events: none;
}

/* 页脚 */
.main-footer {
  text-align: center;
  padding: 2rem;
  color: var(--color-gray);
  font-size: 0.9rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  margin-top: 4rem;
}

/* 响应式布局 */
@media (max-width: 1024px) {
  .material-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  
  .entrance-nav {
    grid-template-columns: 1fr;
  }
  
  .nav-item {
    height: 40vh;
  }
}

@media (max-width: 768px) {
  .slide-text {
    font-size: 1.8rem;
  }
  
  .page-title {
    font-size: 2rem;
  }
  
  .material-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .silhouette-grid {
    grid-template-columns: 1fr;
  }
  
  .page-navigation {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  
  .material-image {
    height: 300px;
  }
}