/* ========================================
   hexo-theme-starter - Minimalist Blog Theme
   ======================================== */

/* ---- CSS Variables ---- */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-card: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-link: var(--color-primary);
  --color-code-bg: #f1f5f9;
  --color-shadow: rgba(0, 0, 0, 0.06);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
  --font-size-base: 16px;
  --line-height-base: 1.75;

  /* Layout */
  --container-max: 1100px;
  --sidebar-width: 280px;
  --gap: 2rem;
  --radius: 8px;
  --header-height: 60px;
}

/* ---- Dark Mode ---- */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-card: #1e293b;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #334155;
  --color-border-light: #1e293b;
  --color-code-bg: #1e293b;
  --color-shadow: rgba(0, 0, 0, 0.3);
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s, color 0.3s;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

ul, ol {
  list-style: none;
}

/* ---- Container ---- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---- Main Content ---- */
.main-content {
  flex: 1;
  padding: var(--gap) 0;
}

.content-wrapper {
  display: flex;
  gap: var(--gap);
}

.content-wrapper.has-sidebar .primary-content {
  flex: 1;
  min-width: 0;
}

.primary-content {
  width: 100%;
}

/* ===========================
   Header
   =========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.85);
  height: var(--header-height);
}

[data-theme="dark"] .site-header {
  background: rgba(15, 23, 42, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.site-brand {
  color: var(--color-text);
}

.site-brand:hover {
  color: var(--color-primary);
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-bg-secondary);
}

/* Hamburger Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: 0.3s;
}

.hamburger::before,
.hamburger::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  position: absolute;
  transition: 0.3s;
}

.hamburger::before {
  top: -6px;
}

.hamburger::after {
  top: 6px;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0.375rem;
  margin-left: 0.5rem;
  color: var(--color-text-secondary);
  transition: all 0.2s;
}

.theme-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

[data-theme="light"] .icon-moon {
  display: none;
}

[data-theme="dark"] .icon-sun {
  display: none;
}

/* ===========================
   Post Card
   =========================== */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.post-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: box-shadow 0.3s, border-color 0.3s;
}

.post-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 20px var(--color-shadow);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.post-meta time {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.post-meta svg {
  opacity: 0.6;
}

.post-category a {
  color: var(--color-primary);
  font-weight: 500;
}

.post-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

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

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

.post-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.read-more:hover {
  gap: 0.5rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding: 0.125rem 0.5rem;
  background: var(--color-bg-secondary);
  border-radius: 9999px;
  transition: all 0.2s;
}

.tag:hover {
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.1);
}

/* ===========================
   Post Detail
   =========================== */
.post-detail {
  max-width: 800px;
}

.post-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.post-header .post-meta {
  flex-wrap: wrap;
}

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

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

/* Post Body */
.post-body-wrapper {
  position: relative;
}

.post-body {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text);
}

.post-body h1, .post-body h2, .post-body h3,
.post-body h4, .post-body h5, .post-body h6 {
  font-weight: 700;
  line-height: 1.4;
  margin-top: 2em;
  margin-bottom: 0.75em;
  color: var(--color-text);
}

.post-body h1 { font-size: 1.75rem; }
.post-body h2 { font-size: 1.5rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.3em; }
.post-body h3 { font-size: 1.25rem; }
.post-body h4 { font-size: 1.125rem; }

.post-body p {
  margin-bottom: 1.25em;
}

.post-body ul, .post-body ol {
  padding-left: 1.5em;
  margin-bottom: 1.25em;
}

.post-body ul { list-style-type: disc; }
.post-body ol { list-style-type: decimal; }

.post-body li {
  margin-bottom: 0.375em;
}

.post-body blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 0.75em 1em;
  margin: 1.25em 0;
  background: var(--color-bg-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text-secondary);
}

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

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--color-primary);
}

.post-body pre {
  margin: 1.25em 0;
  border-radius: var(--radius);
  overflow-x: auto;
}

.post-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25em 0;
}

.post-body th, .post-body td {
  border: 1px solid var(--color-border);
  padding: 0.625em 0.875em;
  text-align: left;
}

.post-body th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}

.post-body img {
  border-radius: var(--radius);
  margin: 1em 0;
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2em 0;
}

.post-body a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Post Footer */
.post-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* Post Navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.post-nav-item {
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all 0.2s;
}

.post-nav-item:hover {
  border-color: var(--color-primary);
}

.post-nav-item.disabled {
  opacity: 0;
  pointer-events: none;
}

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

.nav-label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.nav-title {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ===========================
   TOC - Feishu-style Persistent Sidebar
   =========================== */
.toc-aside {
  position: fixed;
  left: 0;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  z-index: 90;
}

.toc-toggle {
  position: absolute;
  left: 0;
  top: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.625rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: none;
  border-radius: 0 var(--radius) var(--radius) 0;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  box-shadow: 2px 2px 8px var(--color-shadow);
  transition: all 0.25s;
  white-space: nowrap;
  z-index: 2;
}

.toc-toggle span {
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-width 0.25s, opacity 0.25s;
}

.toc-toggle:hover span {
  max-width: 4rem;
  opacity: 1;
}

.toc-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Open state: button moves to panel edge */
.toc-aside.open .toc-toggle {
  left: 240px;
  color: var(--color-primary);
  background: var(--color-bg-secondary);
}

/* Panel */
.toc-panel {
  width: 240px;
  height: 100%;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  padding: 1.25rem 1rem;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toc-aside.open .toc-panel {
  transform: translateX(0);
}

.toc-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.toc-content ol {
  list-style: none;
}

.toc-content li {
  margin-bottom: 2px;
}

.toc-content a {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  border-left: 2px solid transparent;
  transition: all 0.15s;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc-content a:hover {
  color: var(--color-text);
  background: var(--color-bg-secondary);
}

.toc-content a.active {
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.06);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

.toc-content ol ol {
  padding-left: 0.75rem;
}

/* Content area shifts when TOC is open */
body.toc-open .main-content {
  margin-left: 240px;
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-content {
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Scrollbar for TOC panel */
.toc-panel::-webkit-scrollbar {
  width: 3px;
}

.toc-panel::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

/* Hide TOC on narrow screens */
@media (max-width: 1100px) {
  .toc-aside {
    display: none;
  }
  body.toc-open .main-content {
    margin-left: 0;
  }
}

/* ===========================
   Pagination
   =========================== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.pagination-item {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all 0.2s;
}

.pagination-item:hover:not(.disabled) {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.pagination-item.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-info {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ===========================
   Archive
   =========================== */
.archive-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.archive-count {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.archive-year {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.archive-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.archive-item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.archive-item time {
  flex-shrink: 0;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  min-width: 3.5rem;
}

.archive-item a {
  color: var(--color-text);
  font-weight: 500;
}

.archive-item a:hover {
  color: var(--color-primary);
}

/* ===========================
   Category & Tag Pages
   =========================== */
.category-list,
.tag-cloud-page {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-weight: 500;
  color: var(--color-text);
  transition: all 0.2s;
}

.category-item:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.category-count {
  font-size: 0.75rem;
  background: var(--color-bg-secondary);
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  color: var(--color-text-muted);
}

.tag-cloud-item {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: var(--color-bg-secondary);
  border-radius: 9999px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: all 0.2s;
}

.tag-cloud-item:hover {
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
}

.tag-cloud-item .count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ===========================
   Page Detail
   =========================== */
.page-detail {
  max-width: 800px;
}

.page-header {
  margin-bottom: 2rem;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-body {
  font-size: 1rem;
  line-height: 1.85;
}

/* Reuse post-body styles for page body */
.page-body h1, .page-body h2, .page-body h3,
.page-body h4, .page-body h5, .page-body h6 {
  font-weight: 700;
  line-height: 1.4;
  margin-top: 1.5em;
  margin-bottom: 0.75em;
}

.page-body p {
  margin-bottom: 1.25em;
}

.page-body ul, .page-body ol {
  padding-left: 1.5em;
  margin-bottom: 1.25em;
}

.page-body ul { list-style-type: disc; }
.page-body ol { list-style-type: decimal; }

/* ===========================
   Sidebar
   =========================== */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
}

.widget {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.widget-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary);
}

.widget-list {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.widget-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.widget-list a:hover {
  color: var(--color-primary);
}

.widget-list .count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.tag-item {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  padding: 0.125rem 0.5rem;
  background: var(--color-bg-secondary);
  border-radius: 9999px;
}

.tag-item:hover {
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
}

/* ===========================
   Footer
   =========================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-info {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-info a {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.footer-info a:hover {
  color: var(--color-primary);
}

.powered-by {
  margin-top: 0.25rem;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
}

.footer-social a {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.footer-social a:hover {
  color: var(--color-primary);
}

/* ===========================
   Back to Top
   =========================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  cursor: pointer;
  color: var(--color-text-secondary);
  box-shadow: 0 2px 8px var(--color-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s;
  z-index: 50;
}

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

.back-to-top:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
  :root {
    --gap: 1.25rem;
    --header-height: 56px;
  }

  .content-wrapper {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    order: 2;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
    flex-direction: column;
    align-items: stretch;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 99;
  }

  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border-light);
  }

  .theme-toggle {
    margin: 0.75rem 0 0;
    align-self: flex-start;
  }

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

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

  .footer-inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .post-card {
    padding: 1rem;
  }

  .post-card-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ===========================
   Highlight.js overrides
   =========================== */
.highlight {
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.25em 0;
}

.highlight table {
  width: 100%;
  border: none;
}

.highlight td {
  border: none;
  padding: 0;
}

.highlight .gutter {
  width: 40px;
  text-align: right;
  padding-right: 0.75rem;
  color: var(--color-text-muted);
  user-select: none;
}

.highlight pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
}

.highlight figcaption {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

/* ===========================
   Mermaid Diagrams
   =========================== */
.mermaid {
  text-align: center;
  margin: 1.5em 0;
  padding: 1rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius);
  overflow-x: auto;
}

/* ===========================
   Selection
   =========================== */
::selection {
  background: rgba(37, 99, 235, 0.2);
  color: var(--color-text);
}

/* ===========================
   Scrollbar
   =========================== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* ===========================
   Transitions
   =========================== */
.site-header,
.post-card,
.widget,
.category-item,
.pagination-item,
.back-to-top {
  transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s, color 0.3s;
}