/* =========================================
   1. 全局变量与重置 (Global Variables & Reset)
   ========================================= */
:root {
  /* 色彩方案 */
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F9F9F9;
  --color-text-primary: #2C2C2C;
  --color-text-secondary: #5A5A5A;
  --color-accent: #E0D6CC; /* 燕麦色 */
  --color-accent-hover: #D1C4B8;
  --color-border: #E5E5E5;
  --color-overlay: rgba(0, 0, 0, 0.4);

  /* 字体设置 */
  --font-family-base: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* 间距系统 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 32px;
  --spacing-lg: 64px;
  --spacing-xl: 120px;

  /* 布局约束 */
  --container-width: 1200px;
  --header-height: 80px;
  
  /* 动画 */
  --transition-speed: 0.4s;
  --transition-ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-family-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-speed) var(--transition-ease);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

ul {
  list-style: none;
}

/* 布局容器 */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  width: 100%;
}

/* =========================================
   2. 导航栏 (Navigation)
   ========================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-speed);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
}

.main-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  position: relative;
  padding: 5px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text-primary);
  transition: width var(--transition-speed) var(--transition-ease);
}

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

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

/* =========================================
   3. 通用排版 (Typography)
   ========================================= */
.section-title {
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 4px;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  text-align: center;
  font-weight: 300;
}

/* =========================================
   4. 主页：隽永之物 (Home: Timeless)
   ========================================= */
/* 轮播图 */
.hero-slider {
  height: 100vh;
  width: 100%;
  position: relative;
  overflow: hidden;
  background-color: var(--color-bg-secondary);
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1.2s var(--transition-ease);
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide.active {
  opacity: 1;
  z-index: 1;
}

.slide-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.9);
}

.slide-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  max-width: 800px;
  padding: 0 var(--spacing-md);
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.8s 0.2s var(--transition-ease);
}

.slide.active .slide-content {
  transform: translateY(0);
  opacity: 1;
}

.slide-title {
  font-size: 3rem;
  font-weight: 300;
  letter-spacing: 8px;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.slide-desc {
  font-size: 1.1rem;
  font-weight: 300;
  letter-spacing: 1px;
  opacity: 0.9;
}

/* 轮播控制 */
.slider-controls {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: var(--spacing-sm);
}

.control-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: background-color 0.3s;
}

.control-dot.active {
  background-color: #fff;
}

/* 细节三栏网格 */
.details-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-bg-primary);
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

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

.detail-image-wrapper {
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
  aspect-ratio: 3/4;
}

.detail-image-wrapper img {
  width: 100%;
  height: 100%;
  transition: transform 0.6s var(--transition-ease);
}

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

.detail-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  letter-spacing: 2px;
  margin-top: var(--spacing-xs);
}

/* =========================================
   5. 专题页：灵感辑录 (Inspiration)
   ========================================= */
.inspiration-header {
  padding-top: calc(var(--header-height) + var(--spacing-lg));
  padding-bottom: var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  text-align: center;
}

.story-section {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.story-section:last-child {
  border-bottom: none;
}

.story-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.story-layout.reverse .story-image {
  order: 2;
}

.story-layout.reverse .story-content {
  order: 1;
}

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

.story-title {
  font-size: 1.8rem;
  font-weight: 300;
  margin-bottom: var(--spacing-md);
  letter-spacing: 3px;
}

.story-desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
  text-align: justify;
}

.story-tags {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.story-tag {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.story-image img {
  width: 100%;
  height: auto;
  aspect-ratio: 4/5;
}

/* =========================================
   6. 集合页：风格图鉴 (Gallery)
   ========================================= */
.gallery-page {
  padding-top: calc(var(--header-height) + var(--spacing-lg));
  padding-bottom: var(--spacing-xl);
}

.filter-bar {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.filter-btn {
  background: none;
  border: 1px solid transparent;
  padding: 8px 24px;
  font-size: 0.9rem;
  letter-spacing: 1px;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all 0.3s ease;
  font-family: inherit;
}

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

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-sm);
  grid-auto-flow: dense;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s forwards;
}

.gallery-item.hidden {
  display: none;
}

/* 定义不同尺寸的网格单元以实现简单的瀑布流视觉 */
.gallery-item:nth-child(3n) {
  grid-row: span 2;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  transition: transform 0.5s var(--transition-ease);
}

.gallery-item:hover img {
  transform: scale(1.03);
}

.item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
  color: #fff;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
  pointer-events: none;
}

.gallery-item:hover .item-overlay {
  opacity: 1;
  transform: translateY(0);
}

.item-tags {
  font-size: 0.85rem;
  letter-spacing: 1px;
  font-weight: 300;
}

/* =========================================
   7. 页脚 (Footer)
   ========================================= */
.site-footer {
  padding: var(--spacing-md) 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
}

.copyright {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  letter-spacing: 1px;
}

/* =========================================
   8. 动画关键帧 (Keyframes)
   ========================================= */
@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================
   9. 响应式适配 (Responsive)
   ========================================= */
@media (max-width: 992px) {
  :root {
    --spacing-xl: 80px;
    --container-width: 90%;
  }
  
  .details-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .slide-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-md: 24px;
    --header-height: 60px;
  }

  .nav-link {
    font-size: 12px;
  }

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

  .story-layout, .story-layout.reverse {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .story-layout.reverse .story-image {
    order: 0; /* 重置顺序，移动端图片总是在上 */
  }
  
  .story-layout.reverse .story-content {
    order: 1;
  }

  .slide-title {
    font-size: 1.8rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .main-nav {
    gap: var(--spacing-sm);
  }
  
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}