/* ============================================================
   Blog Optimizations - Custom CSS Overrides
   Dark Mode, Code Blocks, Reading Progress, Mobile Catalog, etc.
   ============================================================ */

/* ── CSS Variables (Light Mode Default) ── */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-card: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #e5e5e5;
  --accent-color: #0085a1;
  --accent-hover: #005f73;
  --code-bg: #f6f8fa;
  --code-text: #24292e;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --catalog-bg: #fafafa;
  --catalog-active: #0085a1;
  --tag-bg: transparent;
  --tag-border: #bfbfbf;
  --tag-hover-bg: #0085a1;
  --tag-hover-text: #ffffff;
  --table-stripe: #f8f9fa;
  --blockquote-border: #0085a1;
  --blockquote-bg: #f8f9fa;
  --blockquote-text: #666;
  --hr-color: #e5e5e5;
  --footer-bg: transparent;
  --navbar-bg: rgba(255,255,255,0.95);
  --navbar-border: rgba(0,0,0,0.05);
  --search-bg: #ffffff;
  --share-bg: #f8f9fa;
  --related-bg: #ffffff;
  --related-hover: #f0f0f0;
  --progress-bg: #0085a1;
  --copy-btn-bg: rgba(0,0,0,0.06);
  --copy-btn-hover: rgba(0,0,0,0.12);
  --copy-btn-text: #666;
  --mobile-catalog-bg: #ffffff;
}

/* ── Dark Mode ── */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #1e1e3a;
  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --text-muted: #808080;
  --border-color: #2a2a4a;
  --accent-color: #00b4d8;
  --accent-hover: #48cae4;
  --code-bg: #0d1117;
  --code-text: #c9d1d9;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --catalog-bg: #1e1e3a;
  --catalog-active: #00b4d8;
  --tag-bg: transparent;
  --tag-border: #666;
  --tag-hover-bg: #00b4d8;
  --tag-hover-text: #ffffff;
  --table-stripe: #1e1e3a;
  --blockquote-border: #00b4d8;
  --blockquote-bg: #1e1e3a;
  --blockquote-text: #b0b0b0;
  --hr-color: #2a2a4a;
  --footer-bg: transparent;
  --navbar-bg: rgba(26,26,46,0.95);
  --navbar-border: rgba(255,255,255,0.05);
  --search-bg: #1e1e3a;
  --share-bg: #1e1e3a;
  --related-bg: #1e1e3a;
  --related-hover: #2a2a4a;
  --progress-bg: #00b4d8;
  --copy-btn-bg: rgba(255,255,255,0.08);
  --copy-btn-hover: rgba(255,255,255,0.15);
  --copy-btn-text: #b0b0b0;
  --mobile-catalog-bg: #1e1e3a;
}

/* ── Remove Independent Scrollbars (Fix three-scrollbar issue) ── */
article,
article .container,
article .row,
article .post-container,
article .sidebar-container,
article .catalog-container {
  overflow: visible !important;
  height: auto !important;
  max-height: none !important;
}

/* ── Apply Variables to Body ── */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ── Typography ── */
body, p, span, div, li, td, th {
  color: var(--text-primary);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
}

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

/* ── Navbar ── */
.navbar-default {
  background-color: var(--navbar-bg) !important;
  border-bottom-color: var(--navbar-border) !important;
}
.navbar-default .navbar-brand {
  color: var(--text-primary) !important;
}
.navbar-default .nav li > a {
  color: var(--text-secondary) !important;
}
.navbar-default .nav li > a:hover {
  color: var(--accent-color) !important;
}
.navbar-default .navbar-toggle {
  border-color: var(--border-color) !important;
}
.navbar-default .navbar-toggle .icon-bar {
  background-color: var(--text-primary) !important;
}

/* ── Post Content ── */
.post-container {
  background: var(--bg-primary);
}
.post-container p,
.post-container ul,
.post-container ol {
  color: var(--text-primary);
}

/* ── Blockquote ── */
.post-container blockquote {
  color: var(--blockquote-text);
  border-left-color: var(--blockquote-border);
  background: var(--blockquote-bg);
}

/* ── Horizontal Rule ── */
.post-container hr {
  border-top-color: var(--hr-color);
}

/* ── Tables ── */
.post-container table tr:nth-child(even) {
  background-color: var(--table-stripe);
}
.post-container table th,
.post-container table td {
  border-color: var(--border-color);
}
.post-container table th {
  background-color: var(--bg-secondary);
}

/* ── Code Blocks ── */
.post-container pre,
.post-container code {
  background-color: var(--code-bg) !important;
  color: var(--code-text) !important;
}
.post-container pre {
  border-radius: 8px;
  border: 1px solid var(--border-color);
  position: relative;
  padding: 16px;
  overflow-x: auto;
  line-height: 1.6;
}
.post-container code {
  border-radius: 4px;
  padding: 2px 5px;
  font-size: 0.9em;
}
.post-container pre code {
  padding: 0;
  background: none !important;
  border: none;
  font-size: 0.88em;
  line-height: 1.7;
}

/* Code block copy button */
.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 10px;
  font-size: 12px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: var(--copy-btn-bg);
  color: var(--copy-btn-text);
  transition: all 0.2s ease;
  z-index: 10;
  opacity: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.post-container pre:hover .code-copy-btn {
  opacity: 1;
}
.code-copy-btn:hover {
  background: var(--copy-btn-hover);
}
.code-copy-btn.copied {
  color: #22c55e;
}

/* Language label on code blocks */
.code-lang-label {
  position: absolute;
  top: 8px;
  left: 12px;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0.5px;
  pointer-events: none;
}

/* ── Reading Progress Bar ── */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--progress-bg);
  z-index: 9999;
  transition: width 0.1s ease-out;
}

/* ── Dark Mode Toggle ── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 18px;
  transition: all 0.2s ease;
  margin-left: 8px;
}
.theme-toggle:hover {
  background: var(--copy-btn-bg);
  color: var(--accent-color);
}

/* ── Sidebar ── */
.sidebar-container {
  color: var(--text-secondary);
}
.sidebar-container h5,
.sidebar-container h5 a {
  color: var(--text-muted) !important;
}
.sidebar-container a {
  color: var(--text-secondary) !important;
}
.sidebar-container a:hover,
.sidebar-container a:active {
  color: var(--accent-color) !important;
}
.sidebar-container .tags a {
  border-color: var(--tag-border);
  color: var(--text-secondary) !important;
}
.sidebar-container .tags a:hover {
  border-color: var(--accent-color);
  color: var(--accent-color) !important;
}

/* ── Tags ── */
.tags a {
  border-color: var(--tag-border);
  color: var(--text-secondary) !important;
}
.tags a:hover {
  border-color: var(--tag-hover-bg);
  background: var(--tag-hover-bg);
  color: var(--tag-hover-text) !important;
}

/* ── Post Title/Link Colors ── */
.post-title a,
.post-title {
  color: var(--text-primary) !important;
}
.post-title a:hover {
  color: var(--accent-color) !important;
}

.post-content-preview {
  color: var(--text-secondary) !important;
}

.post-meta {
  color: var(--text-muted) !important;
}

/* ── Pager ── */
.pager li > a {
  color: var(--accent-color);
  border-color: var(--border-color);
  background: var(--bg-card);
}
.pager li > a:hover {
  background: var(--bg-secondary);
}
.pager li > a > span {
  color: var(--text-secondary);
}

/* ── Footer ── */
footer {
  background: var(--footer-bg);
}
footer .copyright {
  color: var(--text-muted);
}
footer .copyright a {
  color: var(--text-secondary);
}

/* ── Catalog (TOC) ── */
.side-catalog {
  background: var(--catalog-bg);
  border-radius: 8px;
  padding: 12px;
  overflow: visible !important;
  height: auto !important;
}
.side-catalog .catalog-body a {
  color: var(--text-secondary);
}
.side-catalog .catalog-body a:hover,
.side-catalog .catalog-body a.active {
  color: var(--catalog-active);
}
.side-catalog h5 a {
  color: var(--text-muted) !important;
}

/* ── Mobile Catalog ── */
.mobile-catalog {
  display: none;
  position: relative;
  background: var(--mobile-catalog-bg);
  border-radius: 8px;
  margin: 16px 0;
  padding: 0;
  box-shadow: var(--shadow-sm);
}
.mobile-catalog-toggle {
  display: none;
  width: 100%;
  text-align: left;
  padding: 12px 16px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
.mobile-catalog-toggle::after {
  content: '▾';
  float: right;
  transition: transform 0.2s ease;
}
.mobile-catalog.open .mobile-catalog-toggle::after {
  transform: rotate(180deg);
}
.mobile-catalog-body {
  display: none;
  padding: 0 16px 12px;
  max-height: 60vh;
  overflow-y: auto;
}
.mobile-catalog.open .mobile-catalog-body {
  display: block;
}
.mobile-catalog-body a {
  display: block;
  padding: 6px 0;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  border-bottom: 1px solid var(--border-color);
}
.mobile-catalog-body a:last-child {
  border-bottom: none;
}
.mobile-catalog-body a:hover,
.mobile-catalog-body a.active {
  color: var(--accent-color);
}
.mobile-catalog-body ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.mobile-catalog-body .h3_nav,
.mobile-catalog-body .h4_nav {
  padding-left: 16px;
}
.mobile-catalog-body .h5_nav,
.mobile-catalog-body .h6_nav {
  padding-left: 32px;
}

@media (max-width: 1199px) {
  .mobile-catalog {
    display: block;
  }
  .mobile-catalog-toggle {
    display: block;
  }
}

/* ── Search Bar ── */
.search-container {
  position: relative;
  max-width: 400px;
  margin: 12px auto;
}
.search-input {
  width: 100%;
  padding: 8px 16px 8px 36px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: var(--search-bg);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: all 0.2s ease;
  font-family: inherit;
}
.search-input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0,133,161,0.1);
}
.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
  pointer-events: none;
}
.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  max-height: 400px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
}
.search-result-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background 0.15s ease;
}
.search-result-item:last-child {
  border-bottom: none;
}
.search-result-item:hover {
  background: var(--bg-secondary);
}
.search-result-item a {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  display: block;
}
.search-result-item .search-result-date {
  font-size: 12px;
  color: var(--text-muted);
}
.search-result-item .search-result-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ── Social Sharing Buttons ── */
.share-container {
  background: var(--share-bg);
  border-radius: 8px;
  padding: 16px;
  margin: 24px 0;
  text-align: center;
}
.share-container h5 {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  margin: 0 6px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}
.share-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  color: #fff;
}
.share-btn.twitter { background: #1da1f2; }
.share-btn.wechat { background: #07c160; }
.share-btn.github { background: #333; }

/* ── Related Posts ── */
.related-posts {
  margin: 32px 0;
  padding-top: 24px;
  border-top: 1px solid var(--hr-color);
}
.related-posts h4 {
  color: var(--text-muted);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.related-post-item {
  display: block;
  padding: 12px 16px;
  margin-bottom: 8px;
  border-radius: 8px;
  background: var(--related-bg);
  text-decoration: none;
  transition: background 0.2s ease;
}
.related-post-item:hover {
  background: var(--related-hover);
  text-decoration: none;
}
.related-post-item .related-title {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 15px;
}
.related-post-item .related-date {
  font-size: 12px;
  color: var(--text-muted);
  float: right;
}

/* ── Index Page Post Cards ── */
.post-preview {
  padding: 20px 0;
  border-bottom: 1px solid var(--hr-color);
}
.post-preview:hover .post-title {
  color: var(--accent-color) !important;
}
.post-title {
  font-size: 24px;
  margin-top: 0;
  transition: color 0.2s ease;
}
.post-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  font-weight: 300;
  margin: 0 0 8px;
}
.post-content-preview {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary) !important;
}

/* Post card with header image */
.post-card {
  background: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
  transition: box-shadow 0.3s ease, transform 0.2s ease;
}
.post-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.post-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}
.post-card-body {
  padding: 24px;
}
.post-card-body .post-title {
  font-size: 22px;
  margin-top: 0;
}

@media (max-width: 768px) {
  .post-card-img {
    height: 160px;
  }
  .post-card-body {
    padding: 16px;
  }
}

/* ── About Page ── */
.about-section {
  margin: 32px 0;
}
.about-section h3 {
  color: var(--accent-color);
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 8px;
  display: inline-block;
}
.skill-tag {
  display: inline-block;
  padding: 4px 12px;
  margin: 4px;
  border-radius: 16px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 13px;
  border: 1px solid var(--border-color);
}
.timeline-item {
  padding: 12px 0 12px 24px;
  border-left: 2px solid var(--accent-color);
  position: relative;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-color);
}
.timeline-date {
  font-size: 13px;
  color: var(--text-muted);
}
.timeline-title {
  font-weight: 600;
  color: var(--text-primary);
}
.timeline-desc {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ── 404 Page ── */
.page-fullscreen body {
  background: var(--bg-primary);
}

/* ── Accessibility: Focus Styles ── */
a:focus, button:focus, input:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* ── Scrollbar Styling (Dark Mode) ── */
[data-theme="dark"] ::-webkit-scrollbar {
  width: 8px;
}
[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: #444;
  border-radius: 4px;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* ── Dark Mode Syntax Highlighting Overrides ── */
[data-theme="dark"] .highlight pre,
[data-theme="dark"] pre,
[data-theme="dark"] .highlight .hll {
  background-color: #0d1117 !important;
  border-color: #30363d !important;
}
[data-theme="dark"] .highlight .c,
[data-theme="dark"] .highlight .cm,
[data-theme="dark"] .highlight .c1,
[data-theme="dark"] .highlight .cp,
[data-theme="dark"] .highlight .cs {
  color: #8b949e !important;
}
[data-theme="dark"] .highlight .k,
[data-theme="dark"] .highlight .kd,
[data-theme="dark"] .highlight .kn,
[data-theme="dark"] .highlight .kp,
[data-theme="dark"] .highlight .kr,
[data-theme="dark"] .highlight .ow {
  color: #ff7b72 !important;
}
[data-theme="dark"] .highlight .s,
[data-theme="dark"] .highlight .s1,
[data-theme="dark"] .highlight .s2,
[data-theme="dark"] .highlight .sb,
[data-theme="dark"] .highlight .sc,
[data-theme="dark"] .highlight .se,
[data-theme="dark"] .highlight .sh,
[data-theme="dark"] .highlight .si,
[data-theme="dark"] .highlight .sx {
  color: #a5d6ff !important;
}
[data-theme="dark"] .highlight .n,
[data-theme="dark"] .highlight .nb,
[data-theme="dark"] .highlight .bp {
  color: #e6edf3 !important;
}
[data-theme="dark"] .highlight .nf,
[data-theme="dark"] .highlight .ne {
  color: #d2a8ff !important;
}
[data-theme="dark"] .highlight .m,
[data-theme="dark"] .highlight .mf,
[data-theme="dark"] .highlight .mh,
[data-theme="dark"] .highlight .mi,
[data-theme="dark"] .highlight .mo {
  color: #79c0ff !important;
}
[data-theme="dark"] .highlight .nc,
[data-theme="dark"] .highlight .kt {
  color: #ff7b72 !important;
}
[data-theme="dark"] .highlight .na,
[data-theme="dark"] .highlight .no,
[data-theme="dark"] .highlight .nv,
[data-theme="dark"] .highlight .vc,
[data-theme="dark"] .highlight .vg,
[data-theme="dark"] .highlight .vi {
  color: #7ee787 !important;
}
[data-theme="dark"] .highlight .nt {
  color: #7ee787 !important;
}
[data-theme="dark"] .highlight .err {
  color: #ffa198 !important;
  background-color: transparent !important;
}

/* ── Print Styles ── */
@media print {
  .navbar, .reading-progress-bar, .theme-toggle,
  .share-container, .mobile-catalog, .side-catalog,
  .search-container, footer { display: none !important; }
  body { background: #fff; color: #000; }
  a { color: #000; text-decoration: underline; }
}