/* ========================================
   Cue Blog - SSR Frontend Styles
   ======================================== */

/* ===== CSS Variables ===== */
:root {
  --background: 0 0% 100%;
  --foreground: 224 14% 12%;
  --muted: 220 14% 96%;
  --muted-foreground: 220 9% 46%;
  --border: 220 13% 91%;
  --link: 220 90% 46%;
  --link-hover: 220 90% 38%;

  /* 语义颜色 */
  --hover: 224 14% 12%;

  /* 字号系统 */
  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 0.875rem;
  --text-md: 0.9375rem;
  --text-lg: 1rem;
  --text-xl: 1.125rem;
  --text-2xl: 1.25rem;
  --text-3xl: 1.5rem;
  --text-4xl: 1.875rem;

  /* 间距系统（8px基准） */
  --space-xs: 0.5rem;   /* 8px  */
  --space-sm: 0.75rem;  /* 12px */
  --space-md: 1rem;     /* 16px */
  --space-lg: 1.5rem;   /* 24px */
  --space-xl: 2rem;     /* 32px */
  --space-2xl: 3rem;    /* 48px */
  --space-3xl: 4rem;    /* 64px */
}

.dark {
  --background: 224 16% 8%;
  --foreground: 210 20% 92%;
  --muted: 224 14% 14%;
  --muted-foreground: 220 10% 60%;
  --border: 224 14% 18%;
  --link: 217 92% 76%;
  --link-hover: 217 92% 70%;

  --hover: 210 20% 92%;
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
  overflow-wrap: break-word;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection { background: hsl(var(--foreground) / 0.15); }

::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: hsl(var(--muted-foreground) / 0.25); border-radius: 9999px; }
::-webkit-scrollbar-thumb:hover { background: hsl(var(--muted-foreground) / 0.45); }
.dark ::-webkit-scrollbar-thumb { background: hsl(var(--muted-foreground) / 0.3); }
.dark ::-webkit-scrollbar-thumb:hover { background: hsl(var(--muted-foreground) / 0.5); }

a { color: inherit; text-decoration: none; }

.app-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 48rem;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.site-main { flex: 1; }

/* ===== Extra Block ===== */
.extra-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-xl) 0;
  padding: var(--space-md) var(--space-lg);
  border: 1px solid hsl(var(--border));
  border-radius: 0.75rem;
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}
.extra-card:hover { border-color: hsl(var(--primary) / 0.4); background: hsl(var(--muted) / 0.5); }
.extra-card-title { font-size: var(--text-sm); font-weight: 600; color: hsl(var(--foreground)); flex-shrink: 0; }
.extra-card-desc { font-size: var(--text-sm); color: hsl(var(--muted-foreground)); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.extra-card-arrow { color: hsl(var(--muted-foreground)); flex-shrink: 0; transition: transform 0.2s; }
.extra-card:hover .extra-card-arrow { transform: translateX(2px); }

/* ===== Footnotes ===== */
.markdown-body .footnotes { 
  margin-top: var(--space-2xl); padding-top: var(--space-md);
  border-top: 1px solid hsl(var(--border)); font-size: var(--text-sm); color: hsl(var(--muted-foreground));
}
.markdown-body .footnotes ol { padding-left: 1.25rem; }
.markdown-body .footnotes li { margin-bottom: var(--space-xs); }
.markdown-body sup { font-size: 0.75em; vertical-align: super; }
.markdown-body sup a { text-decoration: none; color: hsl(var(--primary)); }
.markdown-body sup a:hover { text-decoration: underline; }

/* ===== KaTeX (LaTeX) ===== */
.markdown-body .katex-display { 
  overflow-x: auto; overflow-y: hidden; padding: var(--space-sm) 0;
} 
.reward-section { display: flex; justify-content: center; gap: var(--space-3xl); flex-wrap: wrap; }
.reward-item { text-align: center; }
.reward-item img { width: 12rem; height: 12rem; border-radius: 0.75rem; border: 1px solid hsl(var(--border)); display: block; }
.reward-item p { margin-top: var(--space-xs); font-size: var(--text-lg); color: hsl(var(--foreground)); }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid hsl(var(--border) / 0.5);
  background: hsl(var(--background) / 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.header-inner {
  max-width: 48rem;
  margin: 0 auto;
  height: 4rem;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.025em;
  transition: opacity 0.15s;
}
.site-logo:hover { opacity: 0.8; }

.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  position: relative;
  border-radius: 0.375rem;
  padding: 0.375rem 0.75rem;
  font-size: var(--text-base);
  color: hsl(var(--muted-foreground));
  transition: color 0.15s;
}
.nav-link:hover { color: hsl(var(--foreground)); }
.nav-link.active { font-weight: 500; color: hsl(var(--foreground)); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: -1px;
  height: 2px;
  border-radius: 9999px;
  background: hsl(var(--foreground));
}

.nav-mobile { display: none; }

.icon-btn {
  border: none;
  background: none;
  cursor: pointer;
  border-radius: 0.375rem;
  padding: 0.375rem;
  color: hsl(var(--muted-foreground));
  transition: background 0.15s, color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover { background: hsl(var(--muted)); color: hsl(var(--foreground)); }

/* Theme toggle icons */
.theme-toggle .icon-sun { display: none; }
.dark .theme-toggle .icon-sun { display: block; }
.dark .theme-toggle .icon-moon { display: none; }

/* Search Panel */
.search-panel {
  display: none;
  border-top: 1px solid hsl(var(--border) / 0.5);
  animation: slideDown 0.2s ease-out;
}
.search-panel.open { display: block; }

.search-inner {
  max-width: 48rem;
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
}

.search-form { position: relative; }
.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: hsl(var(--muted-foreground));
}
.search-input {
  width: 100%;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--muted) / 0.5);
  border-radius: 0.75rem;
  padding: 0.625rem 0.75rem 0.625rem 2.5rem;
  font-size: var(--text-base);
  color: hsl(var(--foreground));
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}
.search-input:focus { border-color: hsl(var(--link) / 0.5); background: hsl(var(--background)); }

/* Mobile Menu */
.mobile-menu {
  display: none;
  border-top: 1px solid hsl(var(--border) / 0.5);
  padding: var(--space-sm) var(--space-lg);
  animation: slideDown 0.2s ease-out;
}
.mobile-menu.open { display: block; }

.mobile-link {
  display: block;
  border-radius: 0.375rem;
  padding: 0.625rem 0;
  font-size: var(--text-base);
  color: hsl(var(--muted-foreground));
}

/* ===== Footer ===== */
.site-footer {
  margin-top: auto;
  border-top: 1px solid hsl(var(--border) / 0.5);
}
.footer-inner {
  max-width: 48rem;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}
.footer-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--text-sm);
}
.footer-nav a {
  color: hsl(var(--muted-foreground));
  transition: color 0.15s;
}
.footer-nav a:hover { color: hsl(var(--hover)); }
.footer-divider { height: 1px; width: 3rem; background: hsl(var(--border) / 0.6); }
.footer-license { font-size: var(--text-xs); color: hsl(var(--muted-foreground)); }

/* ===== Article Card ===== */
.article-list { display: flex; flex-direction: column; }
.article-list > .article-item + .article-item { border-top: 1px solid hsl(var(--border) / 0.5); }

.article-card { padding: var(--space-lg) 0; }

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  color: hsl(var(--muted-foreground));
  margin-bottom: var(--space-sm);
}
.card-cats { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.card-cat { transition: color 0.15s; }
.card-cat:hover { color: hsl(var(--hover)); }

.card-title {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-sm);
}
.card-title a {
  color: inherit;
  transition: color 0.15s;
}
.card-title a:hover { color: hsl(var(--link)); }
.lock-icon { color: hsl(var(--muted-foreground)); flex-shrink: 0; }

.card-excerpt {
  line-height: 1.625;
  color: hsl(var(--muted-foreground));
}

.card-tags { margin-top: var(--space-sm); display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.card-tag {
  font-size: var(--text-sm);
  color: hsl(var(--muted-foreground) / 0.7);
  transition: color 0.15s;
}
.card-tag:hover { color: hsl(var(--hover)); }

/* ===== Pagination ===== */
.pagination {
  margin-top: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.pagination-count { font-size: var(--text-base); color: hsl(var(--muted-foreground)); }
.pagination-btns { display: flex; align-items: center; gap: var(--space-xs); }
.page-btn {
  border: 1px solid hsl(var(--border));
  border-radius: 0.5rem;
  padding: 0.375rem 0.875rem;
  font-size: var(--text-base);
  transition: background 0.15s;
}
.page-btn:hover { background: hsl(var(--muted)); }
.page-btn.disabled { opacity: 0.3; pointer-events: none; }
.page-info { min-width: 4rem; text-align: center; font-size: var(--text-base); color: hsl(var(--muted-foreground)); }

/* ===== Page Header ===== */
.page-header {
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid hsl(var(--border) / 0.5);
}
.page-title { font-size: var(--text-4xl); font-weight: 700; line-height: 1.3; margin-bottom: var(--space-sm); }
.page-subtitle { font-size: var(--text-base); color: hsl(var(--muted-foreground)); }

/* ===== Empty State ===== */
.empty-state { padding: var(--space-3xl) 0; text-align: center; color: hsl(var(--muted-foreground)); }
.empty-title { font-size: var(--text-xl); }
.empty-desc { margin-top: 0.25rem; font-size: var(--text-base); }

/* ===== Article Detail ===== */
.article-container { position: relative; }
.article-header { margin-bottom: var(--space-xl); }
.article-title { font-size: var(--text-4xl); font-weight: 700; line-height: 1.3; margin-bottom: var(--space-sm); }
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-base);
  color: hsl(var(--muted-foreground));
}
.meta-date { display: inline; }
.meta-cats { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.meta-cats a { transition: color 0.15s; }
.meta-cats a:hover { color: hsl(var(--hover)); }

.article-tags {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid hsl(var(--border) / 0.6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}
.article-tag {
  font-size: var(--text-sm);
  color: hsl(var(--muted-foreground) / 0.7);
  transition: color 0.15s;
}
.article-tag:hover { color: hsl(var(--hover)); }

/* ===== Password Protection ===== */
.lock-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--muted) / 0.3);
  border-radius: 0.5rem;
  padding: var(--space-3xl) var(--space-lg);
  color: hsl(var(--muted-foreground));
}
.lock-box svg { margin-bottom: var(--space-md); }
.lock-box h2 { font-size: var(--text-xl); font-weight: 600; margin-bottom: var(--space-xs); color: hsl(var(--foreground)); }
.lock-box p { font-size: var(--text-base); margin-bottom: var(--space-lg); }
.unlock-form { width: 100%; max-width: 20rem; }
.unlock-input {
  width: 100%;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--background));
  border-radius: 0.375rem;
  padding: 0.5rem 0.75rem;
  text-align: center;
  font-size: var(--text-base);
  color: hsl(var(--foreground));
  outline: none;
  transition: border-color 0.15s;
}
.unlock-input:focus { border-color: hsl(var(--link)); }
.unlock-input.error { border-color: hsl(0 84% 60%); }
.unlock-error { margin-top: 0.5rem; text-align: center; font-size: var(--text-xs); color: hsl(0 84% 60%); }
.unlock-btn {
  margin-top: var(--space-sm);
  width: 100%;
  border: none;
  background: hsl(var(--foreground));
  color: hsl(var(--background));
  border-radius: 0.375rem;
  padding: 0.5rem var(--space-md);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s;
}
.unlock-btn:hover { opacity: 0.9; }

/* ===== Prev / Next ===== */
.prev-next {
  margin-top: var(--space-xl);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.prev-next-card {
  display: flex;
  flex-direction: column;
  border: 1px solid hsl(var(--border) / 0.6);
  border-radius: 0.5rem;
  padding: var(--space-md);
  transition: border-color 0.15s, background 0.15s;
}
.prev-next-card:hover { border-color: hsl(var(--foreground) / 0.2); background: hsl(var(--muted) / 0.3); }
.prev-next-card.next { align-items: flex-end; text-align: right; }
.prev-next-label { font-size: var(--text-xs); color: hsl(var(--muted-foreground)); }
.prev-next-title {
  margin-top: 0.375rem;
  font-size: var(--text-base);
  font-weight: 500;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.prev-next-date { margin-top: 0.25rem; font-size: var(--text-xs); color: hsl(var(--muted-foreground)); }

/* ===== TOC Sidebar ===== */
.toc-sidebar {
  position: fixed;
  left: calc(50% + 25rem);
  top: 6rem;
  z-index: 40;
  width: 13rem;
  bottom: 2rem;
  display: none;
  flex-direction: column;
}
.toc { font-size: var(--text-base); display: flex; flex-direction: column; min-height: 0; }
.toc-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: hsl(var(--muted-foreground));
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}
.toc-list {
  list-style: none;
  border-left: 1px solid hsl(var(--border) / 0.6);
  overflow-y: auto;
  min-height: 0;
}
.toc-link {
  display: block;
  border-left: 2px solid transparent;
  padding: var(--space-xs) 0;
  color: hsl(var(--muted-foreground));
  transition: color 0.15s, border-color 0.15s;
}
.toc-link.level-2 { padding-left: var(--space-sm); }
.toc-link.level-3 { padding-left: var(--space-lg); }
.toc-link:hover { color: hsl(var(--foreground)); }
.toc-link.active {
  border-left-color: hsl(var(--foreground));
  font-weight: 500;
  color: hsl(var(--foreground));
}

/* ===== Archive Timeline ===== */
.archive-list { display: flex; flex-direction: column; gap: 0; }
.archive-year-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-md) 0;
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
  text-align: left;
}
.archive-toggle-icon {
  flex-shrink: 0;
  color: hsl(var(--muted-foreground));
  transition: transform 0.2s ease;
}
.archive-year-group.expanded .archive-toggle-icon { transform: rotate(90deg); }
.archive-year {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: hsl(var(--foreground));
  line-height: 1;
}
.archive-year-meta {
  font-size: var(--text-sm);
  color: hsl(var(--muted-foreground) / 0.6);
  margin-left: auto;
}

/* 折叠内容 */
.archive-year-body {
  display: none;
  padding: 0 0 var(--space-lg) var(--space-lg);
}
.archive-year-group.expanded .archive-year-body { display: block; }

/* 月份 */
.archive-month-group {
  margin-bottom: var(--space-lg);
}
.archive-month-group:last-child { margin-bottom: 0; }
.archive-month {
  font-size: var(--text-sm);
  font-weight: 600;
  color: hsl(var(--muted-foreground));
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

/* 同一天的文竘列表 */
.archive-day-group {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: var(--space-sm);
  align-items: start;
  padding-bottom: var(--space-sm);
}
.archive-date {
  font-size: var(--text-xs);
  color: hsl(var(--muted-foreground) / 0.7);
  font-variant-numeric: tabular-nums;
  padding-top: 0.125rem;
  text-align: right;
}
.archive-day-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* 单文竘链接 */
.archive-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-md);
  line-height: 1.75;
  color: hsl(var(--muted-foreground));
  transition: color 0.15s;
}
.archive-item:hover { color: hsl(var(--foreground)); }
.archive-title { transition: color 0.15s; }
.archive-item:hover .archive-title { color: hsl(var(--foreground)); }
.archive-lock { color: hsl(var(--muted-foreground) / 0.5); flex-shrink: 0; }

/* 移动端适配 */
@media (max-width: 640px) {
  .archive-year { font-size: var(--text-xl); }
  .archive-year-meta { font-size: var(--text-xs); }
  .archive-year-body { padding-left: var(--space-sm); }
  .archive-day-group { grid-template-columns: 44px 1fr; gap: var(--space-xs); }
  .archive-date { font-size: 0.6875rem; }
}

/* ===== Categories ===== */
.cat-list { display: flex; flex-direction: column; }
.cat-list > .cat-item + .cat-item { border-top: 1px solid hsl(var(--border) / 0.4); }
.cat-item {
  display: block;
  padding: var(--space-sm);
  font-size: var(--text-md);
}
.cat-name { color: hsl(var(--muted-foreground)); transition: color 0.15s; }
.cat-item:hover .cat-name { color: hsl(var(--foreground)); }
.cat-name.bold { font-weight: 600; }

/* ===== Tags Cloud ===== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: var(--space-lg); padding-top: var(--space-md);}
.tag-item {
  font-size: var(--text-md);
  color: hsl(var(--muted-foreground));
  transition: color 0.15s;
}
.tag-item:hover { color: hsl(var(--foreground)); }

/* ===== Back to Top ===== */
/* ===== Floating Action Buttons ===== */
.floating-actions {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.fab {
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid hsl(var(--border));
  border-radius: 9999px;
  background: hsl(var(--background) / 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
  color: hsl(var(--foreground));
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s, background 0.15s;
}
.fab:hover { background: hsl(var(--muted)); }

/* Back to top: hidden until scroll */
.fab-back-to-top { opacity: 0; pointer-events: none; }
.fab-back-to-top.visible { opacity: 1; pointer-events: auto; }

/* TOC toggle: only rendered on article pages via template */
.fab-toc.active { background: hsl(var(--muted)); }

/* ===== 404 Page ===== */
.not-found { text-align: center; padding: var(--space-3xl) var(--space-lg); }
.nf-code { font-size: 5rem; font-weight: 700; letter-spacing: -0.05em; color: hsl(var(--foreground)); margin-bottom: var(--space-md); }
.nf-msg { font-size: var(--text-xl); color: hsl(var(--muted-foreground)); margin-bottom: var(--space-lg); }
.nf-link { color: hsl(var(--link)); font-size: var(--text-base); }
.nf-link:hover { color: hsl(var(--link-hover)); text-decoration: underline; }  

/* ===== Markdown Body ===== */
.markdown-body h2, .markdown-body h3 { scroll-margin-top: 5rem; }

.markdown-body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  color: hsl(var(--foreground));
  word-wrap: break-word;
}

.markdown-body h1 { font-size: 1.875rem; font-weight: 700; margin-bottom: var(--space-lg); margin-top: var(--space-2xl); letter-spacing: -0.025em; }
.markdown-body h2 {
  font-size: 1.5rem; font-weight: 700; margin-bottom: var(--space-lg); margin-top: var(--space-2xl); letter-spacing: -0.025em;
  padding-bottom: 0.4em; border-bottom: 1px solid hsl(var(--border));
}
.markdown-body h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: var(--space-md); margin-top: var(--space-xl); letter-spacing: -0.025em; }
.markdown-body h4 { font-size: 1rem; font-weight: 600; margin-bottom: var(--space-sm); margin-top: var(--space-lg); }
.markdown-body p { margin-bottom: var(--space-lg); line-height: 1.8; }
.markdown-body ul { list-style: disc; padding-left: var(--space-lg); margin-bottom: var(--space-lg); }
.markdown-body ol { list-style: decimal; padding-left: var(--space-lg); margin-bottom: var(--space-lg); }
.markdown-body ul li, .markdown-body ol li { margin-bottom: var(--space-xs); line-height: 1.8; }
.markdown-body ul li:last-child, .markdown-body ol li:last-child { margin-bottom: 0; }
.markdown-body strong { font-weight: 600; color: hsl(var(--foreground)); }
.markdown-body em { font-style: italic; }

.markdown-body code {
  font-family: ui-monospace, "SF Mono", "Cascadia Code", "Source Code Pro", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  background: hsl(var(--muted));
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-size: 0.85em;
  font-weight: 500;
}

.markdown-body pre {
  border-radius: 0.75rem;
  margin-bottom: var(--space-lg);
  padding: var(--space-lg);
  background: #f6f8fa;
  border: 1px solid hsl(var(--border));
}
.dark .markdown-body pre { background: #22272e; }

/* Override chroma .chroma/.bg backgrounds */
.markdown-body .chroma { background-color: #f6f8fa; }
.dark .markdown-body .chroma { background-color: #22272e; }
.markdown-body .bg { background-color: #f6f8fa; }
.dark .markdown-body .bg { background-color: #22272e; }

.markdown-body pre code {
  background: transparent;
  padding: 0;
  font-size: 13px;
  line-height: 1.625;
  font-weight: 400;
  font-family: ui-monospace, "SF Mono", "Cascadia Code", "Source Code Pro", Menlo, Consolas, "DejaVu Sans Mono", monospace;
}

/* ===== Chroma Light: GitHub Primer (matches admin hljs) ===== */
.chroma { color: #1f2328; }
.chroma .k, .chroma .kc, .chroma .kd, .chroma .kn,
.chroma .kp, .chroma .kr, .chroma .kt { color: #cf222e; font-weight: normal; }
.chroma .nt { color: #116329; }
.chroma .nf, .chroma .fm, .chroma .nc { color: #8250df; }
.chroma .nb, .chroma .bp { color: #953800; }
.chroma .na, .chroma .no, .chroma .nd, .chroma .ni,
.chroma .nv, .chroma .vc, .chroma .vg, .chroma .vi, .chroma .vm,
.chroma .m, .chroma .mb, .chroma .mf, .chroma .mh, .chroma .mi, .chroma .il, .chroma .mo,
.chroma .o, .chroma .ow, .chroma .or, .chroma .nl { color: #0550ae; font-weight: normal; }
.chroma .s, .chroma .sa, .chroma .sb, .chroma .sc, .chroma .dl,
.chroma .sd, .chroma .s2, .chroma .se, .chroma .sh, .chroma .si,
.chroma .sx, .chroma .sr, .chroma .s1, .chroma .ss { color: #0a3069; }
.chroma .c, .chroma .ch, .chroma .cm, .chroma .c1,
.chroma .cs, .chroma .cp, .chroma .cpf { color: #6e7781; font-style: italic; }
.chroma .nx, .chroma .p { color: #1f2328; }
.chroma .ge { font-style: italic; }
.chroma .gs { font-weight: bold; }
.chroma .gh { color: #0550ae; font-weight: bold; }
.chroma .gd { color: #82071e; background-color: #ffebe9; }
.chroma .gi { color: #116329; background-color: #dafbe1; }
.chroma .go { color: #6e7781; }
.chroma .gt { color: #cf222e; }
.chroma .w { color: #bbbbbb; }

/* ===== Chroma Dark: GitHub Dark Dimmed (matches admin hljs) ===== */
.dark .chroma { color: #adbac7; }
.dark .chroma .k, .dark .chroma .kc, .dark .chroma .kd, .dark .chroma .kn,
.dark .chroma .kp, .dark .chroma .kr, .dark .chroma .kt { color: #f47067; font-weight: normal; }
.dark .chroma .nt { color: #8ddb8c; }
.dark .chroma .nf, .dark .chroma .fm, .dark .chroma .nc { color: #dcbdfb; }
.dark .chroma .nb, .dark .chroma .bp { color: #f69d50; }
.dark .chroma .na, .dark .chroma .no, .dark .chroma .nd, .dark .chroma .ni,
.dark .chroma .nv, .dark .chroma .vc, .dark .chroma .vg, .dark .chroma .vi, .dark .chroma .vm,
.dark .chroma .m, .dark .chroma .mb, .dark .chroma .mf, .dark .chroma .mh, .dark .chroma .mi, .dark .chroma .il, .dark .chroma .mo,
.dark .chroma .o, .dark .chroma .ow, .dark .chroma .or, .dark .chroma .nl { color: #6cb6ff; font-weight: normal; }
.dark .chroma .s, .dark .chroma .sa, .dark .chroma .sb, .dark .chroma .sc, .dark .chroma .dl,
.dark .chroma .sd, .dark .chroma .s2, .dark .chroma .se, .dark .chroma .sh, .dark .chroma .si,
.dark .chroma .sx, .dark .chroma .sr, .dark .chroma .s1, .dark .chroma .ss { color: #96d0ff; }
.dark .chroma .c, .dark .chroma .ch, .dark .chroma .cm, .dark .chroma .c1,
.dark .chroma .cs, .dark .chroma .cp, .dark .chroma .cpf { color: #768390; font-style: italic; }
.dark .chroma .nx, .dark .chroma .p { color: #adbac7; }
.dark .chroma .ge { font-style: italic; }
.dark .chroma .gs { font-weight: bold; }
.dark .chroma .gh { color: #316dca; font-weight: bold; }
.dark .chroma .gd { color: #ffd8d3; background-color: #78191b; }
.dark .chroma .gi { color: #b4f1b4; background-color: #1b4721; }
.dark .chroma .go { color: #768390; }
.dark .chroma .gt { color: #f47067; }
.dark .chroma .w { color: #545d68; }

/* Code block wrapper: copy button stays fixed while pre scrolls horizontally */
.code-block-wrapper {
  position: relative;
  margin-bottom: var(--space-lg);
}
.code-block-wrapper pre {
  margin-bottom: 0;
  overflow-x: auto;
}

/* Code copy button (injected by JS into wrapper, not pre) */
.code-copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  border: none;
  background: hsl(var(--background) / 0.8);
  border-radius: 0.375rem;
  padding: 0.375rem;
  cursor: pointer;
  color: hsl(var(--muted-foreground));
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
  z-index: 1;
}
.code-block-wrapper:hover .code-copy-btn { opacity: 1; }
.code-copy-btn:hover { color: hsl(var(--foreground)); }

.markdown-body blockquote {
  padding-left: var(--space-lg);
  font-style: italic;
  margin-bottom: var(--space-lg);
  border-left: 3px solid hsl(var(--foreground) / 0.2);
  color: hsl(var(--muted-foreground));
  line-height: 1.8;
}

.markdown-body a {
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  text-decoration-color: hsl(var(--link));
  color: hsl(var(--foreground));
  transition: color 0.15s;
}
.markdown-body a:hover { color: hsl(var(--link)); }

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
}
.markdown-body th {
  border: 1px solid hsl(var(--border));
  padding: var(--space-sm) var(--space-md);
  background: hsl(var(--muted));
  font-weight: 600;
  text-align: left;
}
.markdown-body td {
  border: 1px solid hsl(var(--border));
  padding: var(--space-sm) var(--space-md);
}

.markdown-body img { max-width: 100%; border-radius: 0.75rem; margin-bottom: var(--space-lg); }
.markdown-body .reward-item img { max-width: none; margin-bottom: var(--space-sm); }
.markdown-body hr { border: none; border-top: 1px solid hsl(var(--border)); margin: var(--space-2xl) 0; }

/* Task list */
.markdown-body .task-list-item { list-style: none; }
.markdown-body .task-list-item input[type="checkbox"] { margin-right: var(--space-xs); vertical-align: middle; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  :root {
    --space-xl: var(--space-lg);
    --space-2xl: var(--space-xl);
    --space-3xl: var(--space-2xl);
  }
  .nav-desktop { display: none; }
  .nav-mobile { display: flex; align-items: center; gap: 0.25rem; }
  .icon-menu { display: block; }
  .icon-x { display: none; }
  .icon-menu.open { display: none; }
  .icon-x.open { display: block; }
  .container { padding: var(--space-lg) var(--space-md); }
  .footer-inner { padding: var(--space-lg) var(--space-md); }
  .prev-next { grid-template-columns: 1fr; }
  .prev-next-card.next { align-items: flex-start; text-align: left; }
  .floating-actions { bottom: var(--space-md); right: var(--space-md); }
  .markdown-body h1 { font-size: 1.5rem; }
  .markdown-body h2 { font-size: 1.25rem; }
  .markdown-body h3 { font-size: 1.125rem; }
  .markdown-body pre { padding: var(--space-md); }
  .markdown-body p { line-height: 1.75; }
  .markdown-body ul li, .markdown-body ol li { line-height: 1.75; }
  .page-title { font-size: 1.5rem; }
  .article-title { font-size: 1.5rem; }
  .nf-code { font-size: 3.5rem; }
  .code-copy-btn { opacity: 1; }
}

/* Desktop (≥1280px): TOC sidebar default visible */
@media (min-width: 1280px) {
  .toc-sidebar { display: flex; }
  .toc-sidebar.hidden { display: none; }
}

/* Tablet & Mobile (<1280px): TOC as floating panel */
@media (max-width: 1279px) {
  .toc-sidebar {
    position: fixed;
    bottom: calc(var(--space-xl) + 6rem);
    right: var(--space-xl);
    top: auto;
    left: auto;
    width: 16rem;
    max-height: 60vh;
    z-index: 49;
    display: none;
    border: 1px solid hsl(var(--border));
    border-radius: 0.5rem;
    background: hsl(var(--background) / 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    padding: 1rem;
  }
  .toc-sidebar.open { display: flex; }
}

@media (max-width: 640px) {
  .toc-sidebar {
    bottom: calc(var(--space-md) + 6rem);
    right: var(--space-md);
  }
}

/* Prevent FOUC for theme */
html.dark body { background: hsl(var(--background)); }