:root {
  --bg: #fff;
  --text: #2f3a45;
  --muted: #6f7b86;
  --heading: #1f2d3d;
  --link: #1b7fb6;
  --link-hover: #0b5a86;
  --border: rgba(0,0,0,0.12);
  --nav-bg: rgba(255,255,255,0.94);
  --card-bg: #fff;
  --toc-bg: rgba(255,255,255,0.9);
  --code-bg: #f6f8fa;
  --code-text: #2d3748;
}
[data-theme='dark'] {
  --bg: #0f141a;
  --text: #d2dae3;
  --muted: #9aa7b3;
  --heading: #f2f6fa;
  --link: #62b0e8;
  --link-hover: #9ad2f5;
  --border: rgba(255,255,255,0.16);
  --nav-bg: rgba(15,20,26,0.94);
  --card-bg: #131a22;
  --toc-bg: rgba(19,26,34,0.92);
  --code-bg: #18202a;
  --code-text: #d8e0e8;
}
html,
body {
  background-color: var(--bg);
  color: var(--text);
}
body {
  color: var(--text);
}
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--heading);
}
p,
li,
.post-content-preview {
  color: var(--text);
}
a {
  color: var(--link);
}
a:hover,
a:focus {
  color: var(--link-hover);
}
.post-preview > a,
.post-preview > .post-meta > a {
  color: var(--text);
}
.post-preview > .post-meta,
.sidebar-container,
.sidebar-container h5,
.sidebar-container a,
.post-container .tags a {
  color: var(--muted) !important;
}
/* Keep home excerpts visually consistent by clamping to fixed lines. */
.post-preview .post-content-preview {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
  line-height: 1.8;
  min-height: calc(1.8em * 4);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: normal;
}
.navbar-custom {
  transition: background-color 0.2s ease, border-color 0.2s ease;
}
.navbar-custom .container-fluid {
  padding-left: 18px;
  padding-right: 18px;
}
@media only screen and (min-width: 768px) {
  .navbar-custom .container-fluid {
    padding-left: 28px;
    padding-right: 28px;
  }
}
@media only screen and (min-width: 1170px) {
  .navbar-custom.is-fixed {
    background-color: var(--nav-bg);
    border-bottom-color: var(--border);
  }
  .navbar-custom.is-fixed .navbar-brand,
  .navbar-custom.is-fixed .nav li a {
    color: var(--text);
  }
  .navbar-custom.is-fixed .navbar-brand:hover,
  .navbar-custom.is-fixed .navbar-brand:focus,
  .navbar-custom.is-fixed .nav li a:hover,
  .navbar-custom.is-fixed .nav li a:focus {
    color: var(--link-hover);
  }
}
[data-theme='dark'] .navbar-default .navbar-collapse {
  background: transparent;
}
@media only screen and (max-width: 767px) {
  [data-theme='dark'] .navbar-default .navbar-collapse {
    background: var(--card-bg);
  }
}
.theme-toggle-btn {
  margin-top: 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 20px;
  padding: 4px 10px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s ease;
}
.theme-toggle-btn i {
  margin-right: 5px;
}
.theme-toggle-btn:hover,
.theme-toggle-btn:focus {
  background: rgba(255,255,255,0.18);
  color: #fff;
  outline: none;
}
@media only screen and (min-width: 1170px) {
  .navbar-custom.is-fixed .theme-toggle-btn {
    color: var(--text);
    border-color: var(--border);
  }
  .navbar-custom.is-fixed .theme-toggle-btn:hover,
  .navbar-custom.is-fixed .theme-toggle-btn:focus {
    color: var(--link-hover);
    border-color: var(--link-hover);
    background: rgba(127,127,127,0.08);
  }
}
.post-container,
.sidebar-container .short-about,
.comment #ds-thread #ds-reset a.ds-like-thread-button,
.comment #ds-thread #ds-reset li.ds-tab a.ds-current {
  background-color: transparent;
  color: var(--text);
}
.comment {
  margin-top: 24px;
  margin-bottom: 8px;
}
#toc {
  color: var(--text);
}
.toc-article {
  background: var(--toc-bg);
  border-left-color: var(--border);
}
.toc-nav .active > a {
  color: var(--link);
}
.toc-nav-link {
  color: var(--text);
}
.toc-nav-link:hover {
  color: var(--link-hover);
}
.toc-nav-child {
  border-left-color: var(--border);
}
pre,
code,
.highlight {
  background-color: var(--code-bg);
  color: var(--code-text);
}
.highlight pre {
  background-color: var(--code-bg);
  color: var(--code-text);
}
[data-theme='dark'] .post-container blockquote {
  color: var(--muted);
  border-left-color: var(--border);
}
/* Keep hero/banner typography stable in both light and dark themes. */
.intro-header .site-heading h1,
.intro-header .page-heading h1,
.intro-header .post-heading h1,
.intro-header .site-heading .subheading,
.intro-header .page-heading .subheading,
.intro-header .post-heading .subheading,
.intro-header .post-heading .meta,
.intro-header .post-heading .meta a {
  color: #fff !important;
}