/* ============================================
   W.ai 文章页样式 - 护眼阅读
   ============================================ */

/* 文章容器 */
article.post {
  max-width: 800px;
  margin: 0 auto;
  overflow-x: hidden;
}

/* ==================== */
/* 文章头部 */
/* ==================== */
article.post .post-header {
  margin-bottom: 2.5rem;
  text-align: center;
  padding: 3rem 0 2rem;
  border-bottom: none;
  position: relative;
}

article.post .post-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
}

article.post .post-header h1,
article.post .post-header .post-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  word-wrap: break-word;
  overflow-wrap: break-word;
  border: none;
  padding: 0;
}

article.post .post-header .post-meta {
  color: var(--text-tertiary);
  font-size: 0.88rem;
  letter-spacing: 0.3px;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
  justify-content: center;
}

article.post .post-header .post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 0.75rem;
}

article.post .post-header .post-tags span {
  background: var(--tag-bg);
  color: var(--accent);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid rgba(99,102,241,0.12);
}

/* ==================== */
/* 封面图片 */
/* ==================== */
.post-cover {
  margin: 0 -2rem 2.5rem;
  width: calc(100% + 4rem);
  aspect-ratio: 16 / 9;
  max-height: 420px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  position: relative;
}

.post-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.post-cover:hover img {
  transform: scale(1.02);
}

.post-cover::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(to top, rgba(0,0,0,0.3), transparent);
  pointer-events: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.post-cover-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.25rem;
  color: #fff;
  font-size: 0.85rem;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  z-index: 2;
}

/* ==================== */
/* 文章正文 - 护眼排版 */
/* ==================== */
article.post .post-content,
.post-content {
  max-width: 800px;
  margin: 0 auto;
  font-size: 15.5px;
  line-height: 1.65;
  letter-spacing: 0.005em;
  color: var(--text-primary);
}

article.post .post-content p,
.post-content p {
  margin-bottom: 1rem;
}

/* 首段稍大，增加阅读入口感 */
article.post .post-content > p:first-of-type,
.post-content > p:first-of-type {
  font-size: 1.05em;
  color: var(--text-heading);
  line-height: 1.65;
}

/* 标题层级 */
article.post .post-content h1,
.post-content h1 {
  font-size: 1.7rem;
  margin: 2rem 0 1rem;
  font-weight: 800;
  color: var(--text-heading);
  border-bottom: 3px solid var(--accent);
  padding-bottom: 0.4rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

article.post .post-content h2,
.post-content h2 {
  font-size: 1.4rem;
  margin: 2rem 0 0.75rem;
  font-weight: 700;
  color: var(--text-heading);
  border-bottom: none;
  border-left: 4px solid var(--accent);
  padding-left: 16px;
  padding-bottom: 0;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

article.post .post-content h3,
.post-content h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.6rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: -0.01em;
}

article.post .post-content h4,
.post-content h4 {
  font-size: 1.15rem;
  margin: 1.2rem 0 0.6rem;
  font-weight: 600;
  color: var(--text-heading);
}

article.post .post-content h5,
article.post .post-content h6 {
  font-size: 1.05rem;
  margin: 1rem 0 0.5rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* 列表 */
article.post .post-content ul,
article.post .post-content ol,
.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.75rem;
}

article.post .post-content li,
.post-content li {
  margin-bottom: 0.45rem;
  line-height: 1.65;
}

article.post .post-content li::marker {
  color: var(--accent);
  font-weight: 700;
}

/* 链接 */
article.post .post-content a,
.post-content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

article.post .post-content a:hover,
.post-content a:hover {
  border-bottom-color: var(--accent);
}

/* ==================== */
/* 行内代码 */
/* ==================== */
article.post .post-content code:not(pre code),
.post-content code:not(pre code),
.post-content code:not([class*="language-"]) {
  background: var(--bg-tertiary, #f0efec);
  color: var(--accent);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  font-size: 0.88em;
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-weight: 500;
}

/* ==================== */
/* 代码块 - 深色主题 */
/* ==================== */
article.post .post-content pre,
.post-content pre,
pre[class*="language-"] {
  background: #1e1e2e;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: 2rem 0;
  padding: 1.5rem 1.75rem;
  padding-top: 2.5rem;
  position: relative;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  border: 1px solid rgba(255,255,255,0.08);
}

article.post .post-content pre code,
.post-content pre code,
pre[class*="language-"] code {
  background: transparent !important;
  padding: 0 !important;
  border: none !important;
  border-radius: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #e2e8f0;
  font-family: 'JetBrains Mono', 'Fira Code', var(--font-mono);
  display: block;
  white-space: pre;
  tab-size: 4;
}

/* ==================== */
/* 引用块 */
/* ==================== */
article.post .post-content blockquote,
.post-content blockquote {
  border-left: 4px solid var(--accent);
  background: linear-gradient(135deg, rgba(99,102,241,0.04), rgba(99,102,241,0.02));
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  color: var(--blockquote-text);
  font-style: normal;
  line-height: 1.65;
  font-size: 1rem;
  position: relative;
}

article.post .post-content blockquote::before,
.post-content blockquote::before {
  content: '\201C';
  position: absolute;
  top: -8px;
  left: 16px;
  font-size: 3rem;
  color: var(--accent);
  opacity: 0.2;
  font-family: Georgia, serif;
  line-height: 1;
}

article.post .post-content blockquote p:last-child,
.post-content blockquote p:last-child {
  margin-bottom: 0;
}

/* ==================== */
/* 表格 */
/* ==================== */
article.post .post-content table,
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

article.post .post-content th,
.post-content th {
  background: rgba(99,102,241,0.06);
  padding: 0.7rem 1rem;
  text-align: left;
  font-weight: 700;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--border-color);
  color: var(--accent);
}

article.post .post-content td,
.post-content td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

article.post .post-content tr:nth-child(even) td {
  background: rgba(99,102,241,0.02);
}

article.post .post-content tr:hover td {
  background: rgba(99,102,241,0.04);
}

.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius-sm);
}

/* ==================== */
/* 图片 */
/* ==================== */
article.post .post-content img,
.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: 2rem auto;
  display: block;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

article.post .post-content figure { margin: 1.5rem 0; }
article.post .post-content figcaption,
.post-content figcaption {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-top: 0.5rem;
  font-style: italic;
}

/* 图片画廊 */
.post-content .gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.post-content .gallery img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.post-content .gallery img:hover {
  transform: scale(1.05);
}

/* ==================== */
/* 分隔线 */
/* ==================== */
article.post .post-content hr,
.post-content hr {
  border: none;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--border-color) 20%,
    var(--border-color) 80%,
    transparent
  );
  margin: 3rem 0;
}

/* ==================== */
/* 视频 */
/* ==================== */
.post-content .video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.post-content .video-container iframe,
.post-content .video-container video {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

.post-content .video-container.bilibili {
  padding-bottom: 0;
  height: auto;
}

.post-content .video-container.bilibili iframe {
  position: relative;
  height: 400px;
}

/* ==================== */
/* 文章底部区块 */
/* ==================== */
.post-bottom-section {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

/* 文章导航 */
.post-nav {
  background: var(--bg-tertiary, #f0efec);
  border: 1px solid var(--border-color);
}

.post-nav-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: center;
}

.post-nav-item.left { text-align: left; }
.post-nav-item.right { text-align: right; }

.post-nav-divider {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, transparent 0%, var(--border-color) 20%, var(--border-color) 80%, transparent 100%);
}

.post-nav-label {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.post-nav-item.left .post-nav-label::before { content: '←'; font-size: 1.1rem; }
.post-nav-item.right .post-nav-label::after { content: '→'; font-size: 1.1rem; margin-left: 0.4rem; }

.post-nav-title {
  color: var(--text-heading);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-nav-item a {
  text-decoration: none;
  color: inherit;
  display: block;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.post-nav-item a:hover { background: var(--bg-tertiary); }
.post-nav-item a:hover .post-nav-title { color: var(--accent); }

/* 分享区域 */
.share-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  text-align: center;
}

.share-section h3 {
  color: var(--text-heading);
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

/* 相似文章 */
.related-posts {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
}

.related-posts h3,
.related-title {
  color: var(--text-heading);
  font-size: 1.2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.related-post-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  text-decoration: none;
  display: block;
  transition: all 0.2s ease;
  overflow: hidden;
}

.related-post-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.related-post-image {
  height: 100px;
  background-size: cover;
  background-position: center;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  background-color: var(--bg-tertiary);
}

.related-post-image-placeholder {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  opacity: 0.15;
}

.related-post-content {}

.related-post-title {
  color: var(--text-heading);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.4;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-post-card:hover .related-post-title { color: var(--accent); }

.related-post-meta,
.related-post-date {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.related-post-category {
  background: var(--tag-bg);
  color: var(--tag-color);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 500;
}

.no-related {
  color: var(--text-secondary);
  text-align: center;
  padding: 1rem;
}

/* ==================== */
/* 文章目录 - 桌面端侧栏 */
/* ==================== */
.post-toc {
  position: fixed;
  top: 80px;
  left: 20px;
  width: 220px;
  max-height: calc(100vh - 120px);
  background: transparent;
  border: none;
  border-radius: 0;
  overflow: hidden;
  box-shadow: none;
  transition: all 0.3s ease;
  z-index: 100;
}

.post-toc:hover {
  box-shadow: none;
}

@media (max-width: 1199px) {
  .post-toc {
    position: relative;
    top: auto;
    left: auto;
    width: 100%;
    max-width: 800px;
    max-height: none;
    margin: 0 auto 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
  }
}

@media (max-width: 768px) {
  .post-toc {
    margin: 0 0 1.5rem 0;
    border-radius: var(--radius-md);
  }

  .toc-body.mobile-collapsed {
    max-height: 0 !important;
    opacity: 0;
    padding: 0;
  }
}

.toc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4px 10px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s ease;
  position: sticky;
  top: 0;
  background: var(--bg-primary);
  z-index: 1;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 4px;
}

.toc-header:hover { opacity: 0.8; }

.toc-header h3 {
  margin: 0;
  font-size: 0.72rem;
  color: var(--text-tertiary);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: none;
  padding: 0;
}

.toc-toggle {
  color: var(--text-tertiary);
  font-size: 0.68rem;
  transition: transform 0.3s ease;
  white-space: nowrap;
}

.toc-progress {
  height: 2px;
  background: var(--border-light);
  position: sticky;
  top: 35px;
  z-index: 1;
}

.toc-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  width: 0%;
  transition: width 0.15s ease;
  border-radius: 1px;
}

.toc-body {
  padding: 6px 0;
  overflow-y: auto;
  overflow-x: hidden;
  max-height: calc(100vh - 180px);
  opacity: 1;
  scrollbar-width: thin;
  scrollbar-color: rgba(203,213,225,0.3) transparent;
  transition: max-height 0.4s ease, opacity 0.3s ease, padding 0.3s ease;
}

.toc-body::-webkit-scrollbar { width: 2px; }
.toc-body::-webkit-scrollbar-track { background: transparent; }
.toc-body::-webkit-scrollbar-thumb { background: rgba(203,213,225,0.3); border-radius: 2px; }

.toc-body.collapsed {
  max-height: 0 !important;
  opacity: 0;
  padding: 0;
}

.toc-body ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-body a {
  display: block;
  text-decoration: none;
  transition: all 0.15s ease;
  line-height: 1.4;
  border-left: 2px solid transparent;
}

/* H2 级目录 */
.toc-body > ul > li > a {
  padding: 5px 8px 5px 12px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.78rem;
  margin: 0;
}

.toc-body > ul > li > a:hover {
  color: var(--accent);
  border-left-color: var(--accent);
}

/* H3 级目录 */
.toc-body > ul > li > ul > li > a {
  padding: 3px 8px 3px 24px;
  color: var(--text-tertiary);
  font-size: 0.73rem;
  font-weight: 400;
  margin: 0;
}

.toc-body > ul > li > ul > li > a:hover {
  color: var(--accent);
  border-left-color: rgba(99,102,241,0.4);
}

/* H4 级目录 */
.toc-body > ul > li > ul > li > ul > li > a {
  padding: 2px 8px 2px 36px;
  color: var(--text-tertiary);
  font-size: 0.7rem;
  margin: 0;
}

.toc-body a.toc-active {
  color: var(--accent) !important;
  border-left-color: var(--accent) !important;
  font-weight: 600 !important;
}

/* ==================== */
/* 响应式 */
/* ==================== */
@media (max-width: 768px) {
  article.post .post-header h1,
  article.post .post-header .post-title {
    font-size: 1.5rem;
  }

  article.post .post-content,
  .post-content {
    font-size: 16px;
    line-height: 1.8;
  }

  article.post .post-content h1, .post-content h1 { font-size: 1.5rem; }
  article.post .post-content h2, .post-content h2 { font-size: 1.3rem; }
  article.post .post-content h3, .post-content h3 { font-size: 1.15rem; }

  article.post .post-content pre,
  .post-content pre,
  pre[class*="language-"] {
    padding: 0.8rem 1rem;
    padding-top: 2rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
  }

  article.post .post-content pre code,
  .post-content pre code {
    font-size: 0.8rem;
  }

  .post-cover {
    border-radius: var(--radius-md);
    max-height: 220px;
  }

  .post-nav-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .post-nav-divider { display: none; }
  .post-nav-item { text-align: left !important; }

  .related-posts-grid {
    grid-template-columns: 1fr;
  }

  .post-bottom-section {
    margin-top: 2rem;
    padding: 1.25rem;
  }
}

@media (max-width: 375px) {
  article.post .post-content,
  .post-content {
    font-size: 15px;
  }

  article.post .post-header h1,
  article.post .post-header .post-title {
    font-size: 1.35rem;
  }
}