/* 设计令牌 */
:root {
  --color-primary: #f5f5f0;
  --color-secondary: #e8e8e3;
  --color-accent: #a0926d;
  --color-text: #333;
  --color-text-light: #666;
  --color-overlay: rgba(0, 0, 0, 0.05);
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 全局样式 */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Source Han Sans CN', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-primary);
  margin: 0;
  padding: 0;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(245, 245, 240, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: var(--spacing-sm) 0;
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--color-text);
  text-decoration: none;
}

.navbar-menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar-link {
  color: var(--color-text-light);
  text-decoration: none;
  transition: var(--transition-smooth);
  position: relative;
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--color-text);
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width 0.3s ease;
}

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

/* 主内容区 */
.main-content {
  margin-top: 60px;
  min-height: calc(100vh - 120px);
}

/* 轮播图 */
.carousel {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

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

.carousel-slide.active {
  opacity: 1;
}

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

.carousel-caption {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: white;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  z-index: 10;
}

.carousel-title {
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

/* 瀑布流网格 */
.grid-masonry {
  column-count: 4;
  column-gap: var(--spacing-sm);
  padding: var(--spacing-md);
}

@media (max-width: 1200px) {
  .grid-masonry {
    column-count: 3;
  }
}

@media (max-width: 768px) {
  .grid-masonry {
    column-count: 2;
  }
}

@media (max-width: 480px) {
  .grid-masonry {
    column-count: 1;
  }
}

.grid-item {
  break-inside: avoid;
  margin-bottom: var(--spacing-sm);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.grid-item-image {
  width: 100%;
  display: block;
  transition: transform 0.5s ease, filter 0.5s ease;
}

.grid-item:hover .grid-item-image {
  transform: scale(1.05);
  filter: brightness(1.1);
}

.grid-item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  color: white;
  padding: var(--spacing-md);
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.grid-item:hover .grid-item-overlay {
  transform: translateY(0);
}

/* 分类筛选 */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  flex-wrap: wrap;
}

.filter-tab {
  padding: var(--spacing-xs) var(--spacing-md);
  background: transparent;
  border: 1px solid var(--color-text-light);
  color: var(--color-text-light);
  cursor: pointer;
  transition: var(--transition-smooth);
  border-radius: var(--radius-sm);
}

.filter-tab:hover,
.filter-tab.active {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

/* 风格册卡片 */
.lookbook-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.lookbook-card {
  background: white;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.lookbook-card:hover {
  transform: translateY(-5px);
}

.lookbook-image {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.lookbook-content {
  padding: var(--spacing-md);
}

.lookbook-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.lookbook-description {
  color: var(--color-text-light);
  line-height: 1.8;
}

/* 关于页面 */
.about-container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  text-align: center;
}

.about-title {
  font-size: 2.5rem;
  font-weight: 300;
  margin-bottom: var(--spacing-lg);
  letter-spacing: 0.1em;
}

.about-text {
  font-size: 1.1rem;
  line-height: 2;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 50px;
  height: 50px;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: var(--transition-smooth);
  z-index: 999;
}

.back-to-top:hover {
  background: var(--color-text);
  transform: translateY(-2px);
}

.back-to-top.visible {
  display: flex;
}

/* 页脚 */
.footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* 响应式工具类 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

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

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.btn-explore {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-accent);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
  margin-top: var(--spacing-md);
}

.btn-explore:hover {
  background: var(--color-text);
  transform: translateY(-2px);
}

/* 加载动画 */
.fade-in {
  animation: fadeIn 0.6s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}