/* ---------------------------------- */
/* 核心设计语言：CSS变量定义 (The Design Language) */
/* 这是我们博客的"营造法式"总纲，一切设计的源头。 */
/* ---------------------------------- */
:root {
  --color-bg: #F8F6F2;
  --color-text: #2D2D2D;
  --color-accent-lotus-red: #C84630;
  --color-text-secondary: #666;
  --color-border: #eee;
  --font-family-serif: "source han serif sc", "思源宋体", "Songti SC", serif;
  --content-width: 1400px;
  --spacing-unit: 8px;
}

/* ---------------------------------- */
/* 深色模式 (Dark Mode) - 庇护所的另一面 */
/* ---------------------------------- */
.dark-theme {
  --color-bg: #212121; /* 深邃宇宙 */
  --color-text: #D1C7B9; /* 温润月光 */
  --color-text-secondary: #7E9C8D;
  --color-accent-lotus-red: #E55A4B; /* 在黑暗中更柔和的朱红 */
  --color-accent-lotus-red-hover: #C84630;
  --color-border: #3A3A3A;
}

/* 系统深色模式自动适配 */
@media (prefers-color-scheme: dark) {
  body:not(.light-theme) {
    --color-bg: #212121; /* 深邃宇宙 */
    --color-text: #D1C7B9; /* 温润月光 */
    --color-text-secondary: #7E9C8D;
    --color-accent-lotus-red: #E55A4B; /* 在黑暗中更柔和的朱红 */
    --color-accent-lotus-red-hover: #C84630;
    --color-border: #3A3A3A;
  }
}

/* ---------------------------------- */
/* 全局设定 (Global Reset & Setup) - 万物的基础 */
/* ---------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-serif);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s ease-in-out, color 0.4s ease-in-out;
}

/* ---------------------------------- */
/* 无障碍跳过链接 (Skip Link) - 为屏幕阅读器用户提供便捷 */
/* ---------------------------------- */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent-lotus-red);
  color: white;
  padding: 8px;
  z-index: 100;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
}

/* ---------------------------------- */
/* 文章布局 (Article Layout) - 禅意的骨架 */
/* ---------------------------------- */
.article-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: calc(var(--spacing-unit) * 8) calc(var(--spacing-unit) * 6);
}

@media (max-width: 768px) {
  .article-container {
    padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 3);
  }
}

@media (max-width: 480px) {
  .article-container {
    padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 2);
  }
}

/* 阅读进度指示器 (Reading Progress) */
.progress-container {
  position: fixed;
  top: 0;
  width: 100%;
  height: 4px;
  background: transparent;
  z-index: 100;
}

.progress-bar {
  height: 100%;
  background: var(--color-accent-lotus-red);
  width: 0%;
}

/* ---------------------------------- */
/* 文本元素 (Typography Elements) - 思想的载体 */
/* ---------------------------------- */
h1 {
  font-size: 36px;
  line-height: 1.3;
  color: var(--color-accent-lotus-red);
  margin-bottom: calc(var(--spacing-unit) * 4);
  font-weight: 500;
}

h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-top: calc(var(--spacing-unit) * 6);
  margin-bottom: calc(var(--spacing-unit) * 3);
  font-weight: 500;
}

p {
  margin-top: 0;
  margin-bottom: calc(var(--spacing-unit) * 3);
}

a {
  color: var(--color-accent-lotus-red);
  text-decoration: none;
  transition: color 0.3s ease-in-out;
}

a:hover {
  color: var(--color-accent-lotus-red-hover);
}

/* ---------------------------------- */
/* 特色元素 (Special Elements) - 灵魂的细节 */
/* ---------------------------------- */

/* 1. "引首章" (The Leading Seal) - 阅读的仪式感 */
.article-body p:first-of-type::first-letter {
  font-family: var(--font-family-kai);
  float: left;
  font-size: 64px; /* 放大以突出 */
  line-height: 1;
  margin-right: calc(var(--spacing-unit) * 1.5);
  margin-bottom: calc(var(--spacing-unit) * -1); /* 微调以优化环绕 */
  color: var(--color-accent-lotus-red);
  font-weight: bold;
}

/* 2. 引用 (Blockquote) - 思想的回响 */
blockquote {
  margin: calc(var(--spacing-unit) * 4) 0;
  padding-left: calc(var(--spacing-unit) * 3);
  border-left: 3px solid var(--color-accent-lotus-red);
  font-family: var(--font-family-kai);
  font-size: 18px;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* 3. 文章目录 (Table of Contents) */
.table-of-contents {
  background-color: rgba(248, 246, 242, 0.7);
  border-left: 3px solid var(--color-accent-lotus-red);
  padding: 16px;
  margin-bottom: 24px;
}

.dark-theme .table-of-contents {
  background-color: rgba(50, 50, 50, 0.5);
}

.table-of-contents h3 {
  margin-top: 0;
  font-size: 20px;
}

.table-of-contents ul {
  list-style-type: none;
  padding-left: calc(var(--spacing-unit) * 2);
}

.table-of-contents a {
  display: block;
  padding: calc(var(--spacing-unit) * 0.5) 0;
}

/* 块引用样式 */
blockquote {
  border-left: 4px solid var(--color-accent-lotus-red);
  padding-left: 16px;
  margin-left: 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

/* 图片和图片说明 */
figure {
  margin: 24px 0;
}

figcaption {
  text-align: center;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

/* 链接样式 */
a {
  color: var(--color-accent-lotus-red);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-accent-lotus-red);
  transition: border-bottom 0.2s, color 0.3s;
}

a:hover {
  border-bottom: 1px solid var(--color-accent-lotus-red);
}

/* ---------------------------------- */
/* 页脚 (Footer) - 温情的注脚 */
/* ---------------------------------- */
.site-footer {
  max-width: var(--content-width);
  margin: 0 auto;
  text-align: center;
  padding: 32px 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 14px;
}

.footer-link {
  color: var(--color-text-secondary);
  margin: 0 8px;
}

/* ---------------------------------- */
/* 无障碍增强 (Accessibility) - 为所有人建的庇护所 */
/* ---------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

:focus-visible {
  outline: 2px dashed var(--color-accent-lotus-red);
  outline-offset: 4px;
}

/* ---------------------------------- */
/* 主题切换按钮 */
/* ---------------------------------- */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1000;
  transition: background-color 0.3s ease;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.3);
}

.dark-theme .theme-toggle {
  background: rgba(0, 0, 0, 0.2);
}

.dark-theme .theme-toggle:hover {
  background: rgba(0, 0, 0, 0.3);
}

/* ---------------------------------- */
/* 响应式设计增强 (Responsive Enhancement) */
/* ---------------------------------- */
@media (max-width: 768px) {
  :root {
    --content-width: 95%;
  }
  
  h1 {
    font-size: 28px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 28px;
  }
  
  .article-body p:first-of-type::first-letter {
    font-size: 48px;
  }
  
  blockquote {
    margin: calc(var(--spacing-unit) * 3) 0;
    padding-left: calc(var(--spacing-unit) * 2);
  }
}

/* ---------------------------------- */
/* 图片优化 (Image Optimization) */
/* ---------------------------------- */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: calc(var(--spacing-unit) * 4) auto;
}

/* 延迟加载图片 */
.lazy-image {
  opacity: 0;
  transition: opacity 0.3s;
}

.lazy-image.loaded {
  opacity: 1;
}

/* ---------------------------------- */
/* 字体加载策略 (Font Loading Strategy) */
/* ---------------------------------- */
@font-face {
  font-family: 'source han serif sc';
  font-display: swap; /* 确保文本在字体加载前可见 */
  /* 其他字体设置 */
}

@font-face {
  font-family: 'kaiti sc';
  font-display: swap;
  /* 其他字体设置 */
} 

/* ---------------------------------- */
/* 造物拾遗卡片样式 (Collection Cards) */
/* ---------------------------------- */
.content-section h3 {
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-text);
  font-weight: 500;
  font-size: 24px;
}

.content-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: calc(var(--spacing-unit) * 3);
  margin-bottom: calc(var(--spacing-unit) * 6);
}

.content-card {
  background-color: rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.4s ease, border-color 0.3s ease;
  border: 1px solid var(--color-border);
  height: 100%;
}

.dark-theme .content-card {
  background-color: transparent;
  border: 1px solid var(--color-text-secondary);
}

.content-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.dark-theme .content-card:hover {
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--color-accent-lotus-red);
}

.content-card h4 {
  margin-top: 0;
  margin-bottom: calc(var(--spacing-unit) * 1);
  font-size: 18px;
  color: var(--color-text);
}

.content-card .date {
  display: block;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 1);
}

.content-card p {
  margin-bottom: 0;
  color: var(--color-text-secondary);
  font-size: 15px;
}

.content-card a {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

/* 造物拾遗专用卡片样式 */
.collection-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  background-color: rgba(255, 255, 255, 0.5);
  height: 100%;
}

.dark-theme .collection-card {
  background-color: transparent;
  border: 1px solid var(--color-text-secondary);
}

.collection-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.dark-theme .collection-card:hover {
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--color-accent-lotus-red);
}

.collection-image {
  width: 100%;
  height: 0;
  padding-bottom: 100%;
  overflow: hidden;
  position: relative;
}

.collection-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  position: absolute;
  top: 0;
  left: 0;
}

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

.collection-info {
  padding: 1.5rem;
}

.collection-info h4 {
  margin-top: 0;
  margin-bottom: calc(var(--spacing-unit) * 1);
  font-size: 18px;
  color: var(--color-text);
}

.collection-info p {
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-text-secondary);
  font-size: 15px;
}

.card-link {
  color: var(--color-accent-lotus-red);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.3s ease;
}

.card-link:hover {
  color: var(--color-accent-lotus-red-hover);
}

/* 响应式调整 */
@media (max-width: 768px) {
  .content-cards {
    grid-template-columns: 1fr;
  }
} 

/* ---------------------------------- */
/* 响应式设计 (Responsive Design) - 适应不同屏幕 */
/* ---------------------------------- */
@media (max-width: 1400px) {
  :root {
    --content-width: 1200px;
  }
}

@media (max-width: 1200px) {
  :root {
    --content-width: 1000px;
  }
  
  .home-layout {
    gap: 1.5rem;
  }
  
  .left-column {
    flex: 0 0 250px;
  }
}

@media (max-width: 1000px) {
  :root {
    --content-width: 90%;
  }
  
  h1 {
    font-size: 32px;
  }
  
  h2 {
    font-size: 22px;
  }
  
  .home-layout {
    flex-direction: column;
  }
  
  .left-column {
    flex: 0 0 auto;
    width: 100%;
  }
  
  .main-categories {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }
  
  .category-item {
    flex: 1 1 auto;
    min-width: 200px;
  }
}

@media (max-width: 768px) {
  :root {
    --content-width: 95%;
  }
  
  .article-container {
    padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 3);
  }
  
  h1 {
    font-size: 28px;
  }
  
  .about-section {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .about-bio {
    justify-content: center;
  }
  
  .about-social {
    justify-content: center;
  }
  
  .content-cards {
    grid-template-columns: 1fr;
  }
  
  .collections-grid {
    grid-template-columns: 1fr;
  }
  
  .site-logo {
    top: 10px;
    left: 10px;
  }
  
  .theme-toggle {
    top: 10px;
    right: 10px;
  }
}

@media (max-width: 480px) {
  .article-container {
    padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 2);
  }
  
  h1 {
    font-size: 24px;
  }
  
  h2 {
    font-size: 20px;
  }
  
  .article-body p:first-of-type::first-letter {
    font-size: 48px;
  }
  
  blockquote {
    margin: calc(var(--spacing-unit) * 3) 0;
    padding-left: calc(var(--spacing-unit) * 2);
  }
  
  .content-card {
    padding: 1rem;
  }
  
  .avatar-container {
    width: 100px;
    height: 100px;
  }
  
  .exhibit-gallery {
    grid-template-columns: 1fr;
  }
  
  .exhibit-header h1 {
    font-size: 22px;
  }
  
  .exhibit-header .tags {
    flex-direction: column;
    align-items: center;
  }
}