/*
 * Highlight Theme - 极简博客主题
 * Inspired by blog.imalan.cn
 * Design: Minimalist, Warm, Reading-focused
 */

/* ========================================
   CSS Variables
   ======================================== */
:root {
  --accent: #b74e4e;
  --accent-light: rgba(183, 78, 78, 0.08);
  --accent-glow: rgba(183, 78, 78, 0.15);
  --bg: #F1F7F4;
  --bg-card: transparent;
  --text: #2c2c2c;
  --text-secondary: #888;
  --text-muted: #aaa;
  --border: #e2efe6;
  --border-light: rgba(0,0,0,0.06);
  /* 思源宋体 (Source Han Serif SC) - 免费开源，可商用 */
  --title-font: "Noto Serif SC", "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", Georgia, serif;
  --body-font: "Noto Serif SC", "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", Georgia, serif;
  --mono-font: "SF Mono", "Fira Code", "Cascadia Code", "JetBrains Mono", "Consolas", monospace;
  --max-width: 560px;
  --spacing-unit: 1rem;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

/* ========================================
   Reset & Base
   ======================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.9;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Subtle paper texture */
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(183, 78, 78, 0.02) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(45, 106, 79, 0.02) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(183, 78, 78, 0.015) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.25s ease;
}

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

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

/* ========================================
   Keyframe Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ========================================
   Reading Progress Bar
   ======================================== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2.5px;
  background: linear-gradient(90deg, var(--accent), #d47878);
  z-index: 1001;
  transition: width 0.1s linear;
  border-radius: 0 1px 1px 0;
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  -webkit-tap-highlight-color: transparent;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(183, 78, 78, 0.12);
  transform: translateY(-2px);
}

.back-to-top:active {
  transform: scale(0.95);
}

/* ========================================
   Site Wrapper
   ======================================== */
.site-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Wrapper fade-in on page load */
.site-wrapper {
  animation: fadeIn 0.5s ease both;
}

/* ========================================
   Header / Site Title
   ======================================== */
.site-header {
  margin-bottom: 4rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  animation: slideDown 0.5s ease both;
  animation-delay: 0.1s;
}

.site-title {
  font-family: var(--title-font);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 0.25rem;
}

.site-title a {
  color: var(--text);
  transition: color 0.25s ease;
}

.site-title a:hover {
  color: var(--accent);
}

.site-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
  font-style: italic;
  letter-spacing: 0.03em;
}

/* Decorative accent line under subtitle */
.header-accent {
  width: 2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 1px;
  margin-top: 0.6rem;
  opacity: 0.5;
}

.site-nav {
  margin-top: 1rem;
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  position: relative;
  padding-bottom: 3px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  border-radius: 1px;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* ========================================
   Main Content Area
   ======================================== */
.main-content {
  flex: 1;
}

/* ========================================
   Post List (Home Page)
   ======================================== */
.post-list {
  /* 无额外容器样式，保持极简 */
}

.post-item {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
  animation: fadeInUp 0.5s ease both;
  position: relative;
  padding-left: 0;
  transition: padding-left 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              background-color 0.3s ease;
  border-radius: 0 4px 4px 0;
}

.post-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10%;
  height: 80%;
  width: 2px;
  background: var(--accent);
  border-radius: 1px;
  opacity: 0;
  transform: scaleY(0);
  transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.post-item:hover {
  padding-left: 1rem;
  background: var(--accent-light);
}

.post-item:hover::before {
  opacity: 0.4;
  transform: scaleY(1);
}

.post-item:nth-child(1) { animation-delay: 0.15s; }
.post-item:nth-child(2) { animation-delay: 0.22s; }
.post-item:nth-child(3) { animation-delay: 0.29s; }
.post-item:nth-child(4) { animation-delay: 0.36s; }
.post-item:nth-child(5) { animation-delay: 0.43s; }
.post-item:nth-child(6) { animation-delay: 0.50s; }
.post-item:nth-child(7) { animation-delay: 0.57s; }
.post-item:nth-child(8) { animation-delay: 0.64s; }
.post-item:nth-child(9) { animation-delay: 0.71s; }
.post-item:nth-child(10) { animation-delay: 0.78s; }

.post-item:first-child {
  padding-top: 0.5rem;
}

.post-item-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.post-cover {
  position: relative;
  width: 100%;
  height: 240px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.post-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.post-item-link:hover .post-cover img {
  transform: scale(1.04);
}

.post-cover-overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.5rem 1.5rem;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.55) 0%,
    rgba(0, 0, 0, 0.25) 40%,
    transparent 100%
  );
  display: flex;
  align-items: flex-end;
}

.post-cover-overlay .post-title {
  color: #fff !important;
  margin: 0;
  font-size: 1.4rem;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.post-item-inner {
  /* 内容区域 */
}

/* 分类标签 */
.post-category {
  margin-bottom: 0.6rem;
}

.category-link {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.category-link:hover {
  color: var(--accent);
  opacity: 0.7;
  transform: translateX(2px);
}

/* 文章标题 */
.post-title {
  font-family: var(--title-font);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  transition: color 0.25s ease;
}

.post-title a {
  color: var(--text);
}

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

/* 摘要文字 */
.post-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0.6rem;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* 日期 */
.post-date {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

/* ========================================
   Pagination
   ======================================== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 3rem 0 1rem;
}

.pagination a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.25s ease, transform 0.2s ease;
  display: inline-block;
}

.pagination a:hover {
  color: var(--accent);
  transform: translateX(3px);
}

.pagination-prev:hover {
  transform: translateX(-3px) !important;
}

/* ========================================
   Related Posts
   ======================================== */
.related-posts {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.related-title {
  font-family: var(--title-font);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

.related-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.related-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.related-item:hover {
  border-color: rgba(183, 78, 78, 0.25);
  background: var(--accent-light);
  transform: translateY(-1px);
}

.related-item-title {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
  transition: color 0.2s ease;
}

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

.related-item-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* ========================================
   Article Page (Single Post)
   ======================================== */
.post-article {
  padding: 2rem 0;
  animation: fadeInUp 0.5s ease both;
  animation-delay: 0.15s;
}

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-article-title {
  font-family: var(--title-font);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.post-meta a {
  color: var(--text-secondary);
}

.post-meta a:hover {
  color: var(--accent);
}

.post-meta .meta-sep {
  color: var(--text-muted);
  font-size: 0.75rem;
  opacity: 0.5;
}

/* Post Tags - 文章底部标签 */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.post-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.2em 0.7em;
  border-radius: 4px;
  letter-spacing: 0.02em;
  transition: background 0.2s ease, color 0.2s ease;
  text-decoration: none;
}

.post-tag:hover {
  background: var(--accent);
  color: #fff !important;
}

/* Post Share - 社交分享按钮 */
.post-share {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
}

.share-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-right: 0.25rem;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.share-btn:hover {
  transform: translateY(-2px);
}

.share-btn.share-twitter:hover {
  color: #1da1f2;
  border-color: rgba(29, 161, 242, 0.3);
  background: rgba(29, 161, 242, 0.06);
}

.share-btn.share-weibo:hover {
  color: #e6162d;
  border-color: rgba(230, 22, 45, 0.3);
  background: rgba(230, 22, 45, 0.06);
}

.share-btn.share-copy:hover {
  color: var(--accent);
  border-color: rgba(183, 78, 78, 0.3);
  background: var(--accent-light);
}

.share-btn.share-copy.copied {
  color: #16a34a;
  border-color: rgba(22, 163, 74, 0.35);
  background: rgba(22, 163, 74, 0.08);
}

.share-copy-icon {
  display: block;
}

.share-btn.share-copy.copied .share-copy-icon {
  display: none;
}

.share-copy-feedback {
  display: none;
  font-size: 0.72rem;
  font-weight: 500;
  color: #16a34a;
  white-space: nowrap;
}

.share-btn.share-copy.copied + .share-copy-feedback {
  display: inline;
}

/* Tags Cloud Page */
.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 1rem 0;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: rgba(0, 0, 0, 0.03);
  padding: 0.35rem 0.9rem;
  border-radius: 20px;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
  border: 1px solid var(--border);
}

.tag-item:hover {
  background: var(--accent-light);
  color: var(--accent);
  transform: translateY(-1px);
  border-color: rgba(183, 78, 78, 0.2);
}

.tag-count {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.04);
  padding: 0.05em 0.45em;
  border-radius: 10px;
  min-width: 1.2rem;
  text-align: center;
}

.tag-item:hover .tag-count {
  color: var(--accent);
  background: rgba(183, 78, 78, 0.1);
}

/* Post Content - 文章正文排版 */
.post-content {
  font-size: 1.05rem;
  line-height: 1.9;
  word-wrap: break-word;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-family: var(--title-font);
  font-weight: 600;
  line-height: 1.4;
  margin-top: 2.2em;
  margin-bottom: 0.8em;
  letter-spacing: -0.01em;
  position: relative;
}

.post-content h1 { font-size: 1.6rem; }
.post-content h2 { font-size: 1.35rem; }
.post-content h3 { font-size: 1.15rem; }
.post-content h4 { font-size: 1rem; }

/* Subtle accent dot before h2 */
.post-content h2::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
  margin-right: 0.5rem;
  vertical-align: middle;
  margin-bottom: 0.15em;
  opacity: 0.6;
}

.post-content p {
  margin-bottom: 1.3em;
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(183, 78, 78, 0.3);
  transition: text-decoration-color 0.2s ease, opacity 0.2s ease;
}

.post-content a:hover {
  text-decoration-color: var(--accent);
  opacity: 0.8;
}

.post-content strong {
  font-weight: 700;
}

.post-content blockquote {
  margin: 1.8em 0;
  padding: 1em 1.35em;
  border-left: 3px solid var(--accent);
  background: linear-gradient(90deg, var(--accent-light) 0%, transparent 100%);
  color: var(--text-secondary);
  font-style: italic;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

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

.post-content code {
  font-family: var(--mono-font);
  font-size: 0.88em;
  background: rgba(45, 106, 79, 0.08);
  color: #2d6a4f;
  padding: 0.15em 0.45em;
  border-radius: 4px;
  font-weight: 500;
}

/* ========================================
   Code Block - 代码块容器
   ======================================== */
.post-content pre,
.page-content pre {
  position: relative;
  margin: 1.8em 0;
  padding: 1.25rem;
  padding-top: 2.4rem;
  background: #eaf5ef !important;
  color: #1a3a2a !important;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.65;
  border: 1px solid #d1e7d8;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.post-content pre code,
.page-content pre code {
  background: none;
  padding: 0;
  color: inherit !important;
  font-size: inherit;
  line-height: inherit;
  border-radius: 0;
  font-weight: 400;
}

/* 代码块语言标签 */
.post-content pre::before,
.page-content pre::before {
  content: attr(data-lang);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1.9rem;
  line-height: 1.9rem;
  padding: 0 14px;
  background: #d4ecd9;
  color: #2d6a4f;
  font-family: var(--body-font);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 8px 8px 0 0;
  pointer-events: none;
}

/* ========================================
   Highlight.js 语法高亮
   ======================================== */
.hljs,
.hljs-subst { color: #1a3a2a; }

.hljs-comment,
.hljs-quote { color: #5a8a6f; font-style: italic; }

.hljs-doctag,
.hljs-keyword,
.hljs-formula { color: #8b5cf6; }

.hljs-deletion,
.hljs-name,
.hljs-section,
.hljs-selector-tag,
.hljs-template-variable,
.hljs-variable { color: #c45c4a; }

.hljs-string,
.hljs-addition,
.hljs-attribute,
.hljs-meta-string,
.hljs-regexp,
.hljs-symbol { color: #2d7a5a; }

.hljs-built_in,
.hljs-class .hljs-title,
.hljs-number { color: #b07d2e; }

.hljs-params,
.hljs-title,
.hljs-title.function_ { color: #2563eb; }

.hljs-builtin-name,
.hljs-link,
.hljs-selector-class,
.hljs-selector-id,
.hljs-type,
.hljs-title.class_ { color: #9a6a2e; }

.hljs-strong { font-weight: bold; }
.hljs-em { font-style: italic; }
.hljs-literal { color: #0d9488; }
.hljs-meta { color: #4a7a5a; }

/* ========================================
   Highlight.js 行号样式
   ======================================== */
table.hljs-ln {
  border: none;
  margin: 0;
  width: auto;
}

td.hljs-ln-numbers,
td.hljs-ln-code {
  border: none;
  padding: 0 12px 0 8px;
  vertical-align: top;
  white-space: nowrap;
}

td.hljs-ln-numbers {
  -webkit-user-select: none;
  user-select: none;
  text-align: right;
  color: #495162;
  min-width: 24px;
  font-size: 0.82em;
  opacity: 0.55;
  transition: opacity 0.15s ease;
}

tr:hover td.hljs-ln-numbers {
  opacity: 0.85;
}

/* ========================================
   代码块复制按钮
   ======================================== */
/* 代码块复制按钮 — 作用于所有 pre 元素 */
pre > .code-copy-btn {
  position: absolute;
  top: 0.4rem;
  right: 10px;
  z-index: 10;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid #c1ddd0;
  border-radius: 4px;
  color: #2d6a4f;
  font-family: var(--body-font);
  font-size: 0.7rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s ease, background 0.2s ease, color 0.2s ease;
  line-height: 1;
  opacity: 1;
  pointer-events: auto;
}

pre > .code-copy-btn:hover {
  background: #fff;
  color: #1a5a3a;
  border-color: #a8d4bc;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

pre > .code-copy-btn.copied {
  color: #16a34a;
  border-color: rgba(22, 163, 74, 0.4);
  background: rgba(22, 163, 74, 0.1);
  opacity: 1;
}

.post-content ul,
.post-content ol {
  margin: 1em 0;
  padding-left: 1.6em;
}

.post-content li {
  margin-bottom: 0.45em;
}

.post-content li::marker {
  color: var(--accent);
  opacity: 0.6;
}

.post-content img {
  border-radius: var(--radius-sm);
  margin: 1.5em auto;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  transition: box-shadow 0.3s ease;
}

.post-content img:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.8em 0;
  position: relative;
}

/* Decorative center dot on hr */
.post-content hr::after {
  content: '·';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg);
  color: var(--text-muted);
  padding: 0 0.8rem;
  font-size: 1.2rem;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03);
}

.post-content th,
.post-content td {
  padding: 0.7em 1em;
  border: 1px solid var(--border);
  text-align: left;
}

.post-content th {
  background: rgba(45, 106, 79, 0.06);
  font-weight: 600;
  color: var(--text);
  font-size: 0.9em;
}

.post-content tr:hover td {
  background: rgba(0, 0, 0, 0.012);
}

/* Post Footer */
.post-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.copyright-notice {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ========================================
   Post Navigation
   ======================================== */
.post-nav {
  display: flex;
  margin-top: 3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  transition: box-shadow 0.3s ease;
}

.post-nav:hover {
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.03);
}

.post-nav-item {
  flex: 1;
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  transition: background-color 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  position: relative;
}

.post-nav-item:hover {
  background-color: rgba(0, 0, 0, 0.015);
}

.post-nav-item + .post-nav-item {
  border-left: 1px solid var(--border);
}

.post-nav-prev {
  align-items: flex-start;
  text-align: left;
}

.post-nav-next {
  align-items: flex-end;
  text-align: right;
}

.post-nav-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
  transition: color 0.2s ease;
}

.post-nav-item:hover .post-nav-label {
  color: var(--accent);
}

.post-nav-title {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.5;
  transition: color 0.25s ease;
}

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

/* Arrow indicators */
.post-nav-prev::before {
  content: '←';
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
  transition: transform 0.25s ease, color 0.2s ease;
}

.post-nav-next::before {
  content: '→';
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
  transition: transform 0.25s ease, color 0.2s ease;
}

.post-nav-prev:hover::before {
  transform: translateX(-3px);
  color: var(--accent);
}

.post-nav-next:hover::before {
  transform: translateX(3px);
  color: var(--accent);
}

/* Comments */
.comments-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

/* ========================================
   Page (Custom Page)
   ======================================== */
.page-article {
  padding: 1rem 0 3rem;
  animation: fadeInUp 0.5s ease both;
  animation-delay: 0.15s;
}

.page-title {
  font-family: var(--title-font);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.01em;
}

.page-content {
  font-size: 1.05rem;
  line-height: 1.9;
}

.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4,
.page-content h5,
.page-content h6 {
  font-family: var(--title-font);
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.6em;
}

.page-content p {
  margin-bottom: 1.2em;
}

.page-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

.page-content a:hover {
  opacity: 0.8;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  margin-top: 4rem;
  animation: fadeIn 0.6s ease both;
  animation-delay: 0.5s;
}

.footer-divider {
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--border) 20%,
    var(--border) 80%,
    transparent 100%
  );
  margin-bottom: 1.25rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  padding-bottom: 2rem;
}

.footer-tech {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--body-font);
  font-size: 0.7rem;
  color: #bbb;
  letter-spacing: 0.03em;
}

.footer-license,
.footer-rss {
  font-family: var(--body-font);
  font-size: 0.7rem;
  color: #bbb !important;
  text-decoration: none !important;
  letter-spacing: 0.03em;
  transition: color 0.2s ease;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.footer-link {
  display: flex;
  align-items: center;
  color: #bbb !important;
  text-decoration: none !important;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-link:hover {
  color: var(--accent) !important;
  transform: translateY(-1px);
}

.footer-license:hover,
.footer-rss:hover {
  color: var(--accent) !important;
}

.footer-tech a {
  color: #bbb;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-tech a:hover {
  color: var(--accent);
}

/* ========================================
   Archives Page
   ======================================== */
.archives-page {
  max-width: 680px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  animation: fadeInUp 0.5s ease both;
  animation-delay: 0.15s;
}

.archives-page .page-title {
  font-family: var(--title-font);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}

.archive-year {
  margin-bottom: 2rem;
}

.year-title {
  font-family: var(--body-font);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.year-posts {
  display: flex;
  flex-direction: column;
}

.archive-post-item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.7rem 0;
  text-decoration: none;
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
  border-bottom: 1px dashed var(--border-light);
}

.archive-post-item:last-child {
  border-bottom: none;
}

.archive-post-item:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.archive-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  min-width: 3.5rem;
}

.archive-title {
  font-family: var(--body-font);
  font-size: 0.95rem;
  font-weight: 500;
  color: inherit;
  flex: 1;
  line-height: 1.45;
}

.archive-category {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

/* ========================================
   Categories Page
   ======================================== */
.categories-list {
  display: flex;
  flex-direction: column;
}

.category-name {
  font-family: var(--body-font);
  font-size: 0.95rem;
  font-weight: 500;
  color: inherit;
  flex: 1;
  line-height: 1.45;
}

.category-count {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  min-width: 2rem;
  text-align: right;
}

/* ========================================
   Mermaid Diagrams
   ======================================== */
.mermaid-container {
  margin: 2em auto;
  text-align: center;
  overflow-x: auto;
}

.mermaid-container svg {
  max-width: 100%;
  height: auto;
}

.mermaid-error {
  border-radius: var(--radius-sm);
}

/* ========================================
   Search Button (Nav)
   ======================================== */
.search-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--body-font);
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 0;
  letter-spacing: -0.01em;
}

.search-btn:hover {
  color: var(--accent);
}

/* ========================================
   Search Modal
   ======================================== */
.search-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 999;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.search-overlay.active {
  display: block;
  animation: fadeIn 0.2s ease both;
}

.search-modal {
  position: fixed;
  top: 12%;
  left: 50%;
  transform: translateX(-50%);
  width: min(620px, 92vw);
  max-height: 70vh;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.15),
    0 4px 16px rgba(0, 0, 0, 0.06),
    0 0 0 1px rgba(0, 0, 0, 0.04);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px) scale(0.98);
  transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              visibility 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.search-modal.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0) scale(1);
}

.search-modal-header {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #eee;
  gap: 0.75rem;
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  font-size: 1.05rem;
  font-family: var(--body-font);
  color: var(--text);
  background: transparent;
  border: none;
  outline: none;
}

.search-input::placeholder {
  color: #bbb;
}

.search-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  color: #999;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  border-radius: 50%;
  transition: color 0.15s ease, background 0.15s ease;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-close:hover {
  color: var(--text);
  background: rgba(0, 0, 0, 0.06);
}

.search-results {
  flex: 1;
  overflow-y: auto;
  padding: 0.25rem 0;
}

.search-placeholder {
  padding: 1rem 1.25rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.search-empty {
  padding: 3rem 1.25rem;
  text-align: center;
  color: #bbb;
  font-size: 0.95rem;
}

.search-result-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.85rem 1.25rem;
  color: var(--text);
  transition: background 0.15s ease;
  text-decoration: none;
  border-left: 2px solid transparent;
}

.search-result-item:hover {
  background: rgba(0, 0, 0, 0.02);
  border-left-color: var(--accent);
  color: var(--text);
}

.result-icon {
  font-size: 1.1rem;
  margin-top: 2px;
  flex-shrink: 0;
  line-height: 1.35;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
}

.result-body {
  flex: 1;
  min-width: 0;
}

.result-title {
  font-family: var(--body-font);
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.45;
  margin-bottom: 0.15rem;
  word-break: break-word;
}

.result-title mark {
  background: #fff3b0;
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}

.result-excerpt {
  font-size: 0.82rem;
  color: #888;
  line-height: 1.55;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  word-break: break-word;
}

.result-excerpt mark {
  background: #fff3b0;
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}

/* ========================================
   Scrollbar (Webkit)
   ======================================== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #d0ccc7;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #bfbaba;
}

/* ========================================
   Selection Color
   ======================================== */
::selection {
  background: var(--accent);
  color: #fff;
}

::-moz-selection {
  background: var(--accent);
  color: #fff;
}

/* ========================================
   Image Lightbox
   ======================================== */
.lightbox-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox-overlay.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-overlay img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  transform: scale(0.92);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.lightbox-overlay.active img {
  transform: scale(1);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 640px) {
  .site-wrapper {
    padding: 1.25rem 1rem;
  }

  .site-header {
    margin-bottom: 2.5rem;
  }

  .site-title {
    font-size: 1.25rem;
  }

  .post-item {
    padding: 2rem 0;
  }

  .post-title {
    font-size: 1.35rem;
  }

  .post-article-title {
    font-size: 1.55rem;
  }

  .post-content {
    font-size: 1rem;
  }

  .page-title {
    font-size: 1.45rem;
  }

  .post-nav-item {
    padding: 1rem 1.2rem;
  }

  .post-nav-title {
    font-size: 0.88rem;
  }

  .back-to-top {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .post-cover {
    height: 200px;
  }

  .post-cover-overlay .post-title {
    font-size: 1.2rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.4rem;
    text-align: center;
  }

  .footer-tech {
    position: static;
    transform: none;
    order: -1;
  }

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

@media (max-width: 400px) {
  .site-nav {
    gap: 1rem;
    flex-wrap: wrap;
  }

  .nav-link {
    font-size: 0.8rem;
  }

  .post-nav {
    flex-direction: column;
  }

  .post-nav-item + .post-nav-item {
    border-left: none;
    border-top: 1px solid var(--border);
  }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
  .site-nav,
  .site-footer,
  .post-nav,
  .comments-section,
  .search-btn,
  .back-to-top,
  .reading-progress {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .site-wrapper {
    max-width: 100%;
    padding: 0;
  }

  .post-content {
    font-size: 11pt;
    line-height: 1.6;
  }
}