:root {
  --rb-radius: 20px;
  /* 彩虹外壳圆角 */
  --rb-thickness: 6px;
  /* 彩虹边框厚度 */
  --content-max: 1600px;
  /* 内容最大宽度 */
}

/* 页面基础样式 */
body {
  margin: 0;
  padding: 2rem 5%;
  background-color: #f8f9fb;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  justify-content: flex-start;
}

/* 容器居中，最大宽度限制 */
.article-wrapper {
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
  padding: 0;
}

/* 卡片样式 */
.article-card {
  background: white;
  border-radius: calc(var(--rb-radius) - var(--rb-thickness));
  padding: 2rem;
  box-shadow: none;
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

/* 动画效果 */
@keyframes fadeInUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* 标题样式 */
.article-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: #222;
}

/* 日期样式 */
.article-date {
  font-size: 0.9rem;
  color: #888;
  margin-bottom: 1.5rem;
}

/* 正文内容 */
.article-content p {
  line-height: 1.7;
  margin-bottom: 1rem;
  color: #333;
  font-size: 1.05rem;
}

/* Enhance article typography */
.article-content h2,
.article-content h3,
.article-content h4 {
  color: #111;
  margin: 1.5rem 0 .75rem;
}

.article-content ul,
.article-content ol {
  padding-left: 1.25rem;
  margin: .75rem 0 1rem;
}

.article-content li {
  margin: .25rem 0;
}

/* Deeply polished clean links */
.article-content a,
.toc a {
  position: relative;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  font-weight: 500;
  color: var(--accent-blue, #2563eb);
  transition: color .2s ease, transform .2s ease;
}

.article-content a::after,
.toc a::after {
  content: none;
}

.article-content a:hover,
.toc a:hover {
  color: var(--accent-green, #22c55e);
  transform: translateY(-1px);
}

.article-content a:hover::after,
.toc a:hover::after {
  content: none;
}

.article-content a:focus-visible,
.toc a:focus-visible {
  outline: 3px solid rgba(0, 128, 255, .35);
  outline-offset: 3px;
  border-radius: 6px;
}

.article-content a:visited,
.toc a:visited {
  color: #5a3fd4;
}

/* Code blocks (light defaults) */
.article-content pre {
  background: #f6f8fa;
  color: #1c2025;
  border-radius: 10px;
  padding: 1rem;
  overflow: auto;
  box-shadow: none;
  border: 1px solid #e6e8eb;
}

.article-content code {
  background: rgba(0, 0, 0, .06);
  padding: .2rem .4rem;
  border-radius: 6px;
}

/* Mobile-friendly wide blocks used in pages */
.article-content pre.code-block {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 12px;
  border-radius: 8px;
  background: inherit;
  font-size: .95em;
  line-height: 1.5;
  margin: .75rem 0 1rem;
}

.article-content pre.code-block code {
  white-space: pre;
  word-break: normal;
}

/* Prism light overrides */
pre[class*="language-"],
code[class*="language-"] {
  background: #f6f8fa !important;
  color: #1c2025 !important;
}

:not(pre)>code[class*="language-"] {
  padding: .15rem .35rem;
  border-radius: 6px;
  border: 1px solid #e6e8eb;
}

/* Remove unwanted glow/overlay on tokens */
pre[class*="language-"],
code[class*="language-"],
pre[class*="language-"] *,
code[class*="language-"] * {
  text-shadow: none !important;
  -webkit-text-stroke: 0 !important;
}

/* Blockquote */
.article-content blockquote {
  margin: 1.2rem 0;
  padding: .8rem 1rem;
  background: #f1f6ff;
  border-left: 4px solid #59a7ff;
  color: #2a405a;
  border-radius: 0 8px 8px 0;
}

/* Images */
.article-content img {
  max-width: 100%;
  display: block;
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, .08);
  margin: 1rem auto;
}

/* 响应式 */
@media (max-width: 600px) {
  .article-card {
    padding: 1.5rem 1rem;
  }

  .article-title {
    font-size: 1.5rem;
  }
}

/* 🌈 Static gradient border shell */
.rainbow-border {
  padding: var(--rb-thickness);
  /* 彩虹边框的厚度 */
  border-radius: var(--rb-radius);
  background: linear-gradient(135deg, #22c55e, #3b82f6);

  display: block;
  width: 100%;
  max-width: var(--content-max);
  box-sizing: border-box;
  overflow: hidden;

  margin: 3rem auto;
  /* 页面居中 + 上下间距 */
}

.back-button {
  position: fixed;
  top: 20px;
  left: 20px;
  font-size: 24px;
  text-decoration: none;
  color: #333;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: background 0.3s;
  z-index: 1000;
}

.back-button:hover {
  background: #f0f0f0;
}

/* 保证彩虹外壳内的卡片占满容器宽度，避免边缘长度异常 */
.rainbow-border>.article-card {
  display: block;
  width: 100%;
  margin: 0;
  box-sizing: border-box;
}

/* ======================
   Dark mode adaptations
   ====================== */
@media (prefers-color-scheme: dark) {
  body {
    background-color: #0a0a0a;
    color: #e8e8e8;
  }

  .article-card {
    background: #111213;
    box-shadow: none;
  }

  .article-title {
    color: #f2f2f2;
  }

  .article-content p {
    color: #d6d8db;
  }

  .article-content h2,
  .article-content h3,
  .article-content h4 {
    color: #f4f6f8;
  }

  /* Code blocks dark */
  .article-content pre {
    background: #0f1011;
    color: #e9eef2;
    box-shadow: none;
    border: 1px solid rgba(255, 255, 255, .08);
  }

  pre[class*="language-"],
  code[class*="language-"] {
    background: #0f1011 !important;
    color: #e9eef2 !important;
  }

  :not(pre)>code[class*="language-"] {
    background: rgba(255, 255, 255, .06) !important;
    border: 1px solid rgba(255, 255, 255, .08);
    color: #f0f3f5 !important;
  }

  /* Ensure no glow in dark mode either */
  pre[class*="language-"],
  code[class*="language-"],
  pre[class*="language-"] *,
  code[class*="language-"] * {
    text-shadow: none !important;
    -webkit-text-stroke: 0 !important;
  }

  /* Fix symbol highlighting issues in dark mode */
  pre[class*="language-"] .token.punctuation,
  pre[class*="language-"] .token.operator,
  pre[class*="language-"] .token.bracket,
  pre[class*="language-"] .token.delimiter,
  code[class*="language-"] .token.punctuation,
  code[class*="language-"] .token.operator,
  code[class*="language-"] .token.bracket,
  code[class*="language-"] .token.delimiter {
    color: #e9eef2 !important;
    background: transparent !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
    text-shadow: none !important;
    -webkit-text-stroke: 0 !important;
  }

  /* Fix specific symbols that might have boxes */
  pre[class*="language-"] .token.punctuation:not(.token.string),
  code[class*="language-"] .token.punctuation:not(.token.string) {
    color: #e9eef2 !important;
    background: transparent !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
  }

  /* Comprehensive fix for all token types that might have visual artifacts */
  pre[class*="language-"] .token,
  code[class*="language-"] .token {
    background: transparent !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
    text-shadow: none !important;
    -webkit-text-stroke: 0 !important;
  }

  /* Specific fixes for common problematic tokens */
  pre[class*="language-"] .token.comment,
  pre[class*="language-"] .token.prolog,
  pre[class*="language-"] .token.doctype,
  pre[class*="language-"] .token.cdata,
  code[class*="language-"] .token.comment,
  code[class*="language-"] .token.prolog,
  code[class*="language-"] .token.doctype,
  code[class*="language-"] .token.cdata {
    color: #6a737d !important;
    background: transparent !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
  }

  pre.line-numbers {
    position: relative;
  }

  pre.line-numbers .line-numbers-rows {
    border-right: 1px solid rgba(255, 255, 255, .08);
    background: transparent;
  }

  .line-numbers-rows>span:before {
    color: rgba(255, 255, 255, .35) !important;
  }

  .article-content code {
    background: rgba(255, 255, 255, .08);
    color: #f0f3f5;
  }

  /* Blockquote */
  .article-content blockquote {
    background: #0f1712;
    border-left: 4px solid #00c86b;
    color: #d1e7db;
  }

  /* Back button */
  .back-button {
    color: #e6e6e6;
    background: #1a1b1d;
    border: 1px solid #2a2c2f;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
  }

  .back-button:hover {
    background: #232528;
  }
}

/* Manual dark mode override (matches media query above) */
html[data-theme="dark"] body {
  background-color: #0a0a0a;
  color: #e8e8e8;
}

html[data-theme="dark"] .article-card {
  background: #111213;
  box-shadow: none;
}

html[data-theme="dark"] .article-title {
  color: #f2f2f2;
}

html[data-theme="dark"] .article-content p {
  color: #d6d8db;
}

html[data-theme="dark"] .article-content h2,
html[data-theme="dark"] .article-content h3,
html[data-theme="dark"] .article-content h4 {
  color: #f4f6f8;
}

html[data-theme="dark"] .article-content pre {
  background: #0f1011;
  color: #e9eef2;
  box-shadow: none;
  border: 1px solid rgba(255, 255, 255, .08);
}

html[data-theme="dark"] pre[class*="language-"],
html[data-theme="dark"] code[class*="language-"] {
  background: #0f1011 !important;
  color: #e9eef2 !important;
}

html[data-theme="dark"] :not(pre)>code[class*="language-"] {
  background: rgba(255, 255, 255, .06) !important;
  border: 1px solid rgba(255, 255, 255, .08);
  color: #f0f3f5 !important;
}

html[data-theme="dark"] pre[class*="language-"] .token,
html[data-theme="dark"] code[class*="language-"] .token {
  background: transparent !important;
  border: none !important;
  outline: none !important;
  box-shadow: none !important;
  text-shadow: none !important;
  -webkit-text-stroke: 0 !important;
}

html[data-theme="dark"] pre[class*="language-"] .token.comment,
html[data-theme="dark"] code[class*="language-"] .token.comment {
  color: #6a737d !important;
}

html[data-theme="dark"] pre.line-numbers .line-numbers-rows {
  border-right: 1px solid rgba(255, 255, 255, .08);
  background: transparent;
}

html[data-theme="dark"] .line-numbers-rows>span:before {
  color: rgba(255, 255, 255, .35) !important;
}

html[data-theme="dark"] .article-content code {
  background: rgba(255, 255, 255, .08);
  color: #f0f3f5;
}

html[data-theme="dark"] .article-content blockquote {
  background: #0f1712;
  border-left: 4px solid #00c86b;
  color: #d1e7db;
}

html[data-theme="dark"] .back-button {
  color: #e6e6e6;
  background: #1a1b1d;
  border: 1px solid #2a2c2f;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
}

html[data-theme="dark"] .back-button:hover {
  background: #232528;
}

/* Manual light mode override (restores light when system is dark) */
html[data-theme="light"] body {
  background-color: #f8f9fb;
  color: inherit;
}

html[data-theme="light"] .article-card {
  background: white;
  box-shadow: none;
}

html[data-theme="light"] .article-title {
  color: #222;
}

html[data-theme="light"] .article-content p {
  color: #333;
}

html[data-theme="light"] .article-content h2,
html[data-theme="light"] .article-content h3,
html[data-theme="light"] .article-content h4 {
  color: #111;
}

html[data-theme="light"] .article-content pre {
  background: #f6f8fa;
  color: #1c2025;
  border: 1px solid #e6e8eb;
}

html[data-theme="light"] pre[class*="language-"],
html[data-theme="light"] code[class*="language-"] {
  background: #f6f8fa !important;
  color: #1c2025 !important;
}

html[data-theme="light"] .article-content code {
  background: rgba(0, 0, 0, .06);
  color: inherit;
}

html[data-theme="light"] .article-content blockquote {
  background: #f1f6ff;
  border-left: 4px solid #59a7ff;
  color: #2a405a;
}

html[data-theme="light"] .back-button {
  color: #333;
  background: #fff;
  border: 1px solid #ccc;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

html[data-theme="light"] .back-button:hover {
  background: #f0f0f0;
}

/* ======================
   Language switching
   ====================== */
/* Default (English or no data-lang): show EN, hide ZH */
.lang-zh {
  display: none;
}

.lang-en {
  display: block;
}

/* When data-lang="zh": show ZH, hide EN */
html[data-lang="zh"] .lang-en {
  display: none;
}

html[data-lang="zh"] .lang-zh {
  display: block;
}