/* ==========================================================================
   Blog index + article pages
   ========================================================================== */

/* --------------------------------------------------------------------------
   Index
   -------------------------------------------------------------------------- */

.blog-index-header {
  margin: 14px 0 30px;
}

.blog-index-header h1 {
  margin: 0 0 6px;
  font-family: 'DM Serif Display', 'Songti SC', 'Noto Serif SC', serif;
  font-size: 3.6rem;
  font-weight: 400;
  line-height: 1.2;
  color: #222;
}

.blog-index-header p {
  margin: 0;
  color: #888;
  font-size: 14.5px;
  line-height: 1.7;
}

.blog-index-subline {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 16px;
}

.blog-count {
  color: #b0b0b0;
  font-size: 12.5px;
  white-space: nowrap;
}

.blog-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.blog-card {
  display: block;
  padding: 22px 24px 20px;
  border: 1px solid #e6e7ea;
  border-radius: 14px;
  background-color: #fff;
  background-image: none;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.blog-card:hover,
.blog-card:focus-visible {
  border-color: #0FA0CE;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.07);
  transform: translateY(-2px);
  outline: none;
}

/* The site-wide a:not(.icon) rule paints a cyan hover gradient behind every
   link; neutralise it here (two classes to outrank that selector). */
.blog-list .blog-card,
.blog-list .blog-card:hover,
.blog-list .blog-card:focus,
.blog-list .blog-card:focus-visible {
  background-image: none;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #999;
  font-size: 12.5px;
  letter-spacing: 0.01em;
}

.blog-card-dot {
  color: #c4c4c4;
}

.blog-card-title {
  margin: 8px 0 0;
  font-family: 'DM Serif Display', 'Songti SC', 'Noto Serif SC', serif;
  font-size: 22px;
  font-weight: 400;
  line-height: 1.45;
  color: #222;
  transition: color 0.2s ease;
}

.blog-card:hover .blog-card-title {
  color: #0b7ea3;
}

.blog-card-summary {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
  margin: 8px 0 16px;
  color: #666;
  font-size: 14.5px;
  line-height: 1.7;
}

.blog-card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.blog-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #f1f3f5;
  color: #6b7280;
  font-size: 11.5px;
  line-height: 1.6;
  white-space: nowrap;
}

.blog-draft {
  display: inline-block;
  margin-left: 2px;
  padding: 1px 7px;
  border-radius: 999px;
  background: #fff3cd;
  color: #9a6b00;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.blog-empty {
  padding: 28px 0;
  color: #999;
  font-size: 15px;
}

/* --------------------------------------------------------------------------
   Article page
   -------------------------------------------------------------------------- */

a.blog-back {
  display: inline-block;
  margin: 2px 0 18px;
  color: #333;
  background-image: none;
  font-size: 14px;
  text-decoration: none;
}

a.blog-back:hover,
a.blog-back:focus {
  color: #333;
  text-decoration: none;
  font-weight: 700;
  background-image: none;
}

body.darkmode a.blog-back {
  color: #ccc;
}

body.darkmode a.blog-back:hover,
body.darkmode a.blog-back:focus {
  color: #ccc;
}

/* The post TOC reuses the site's floating dot navigation. Truncate long
   section labels so they cannot touch the article. */
body.blog-post-page #toc-nav .toc-label {
  display: inline-block;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  vertical-align: middle;
}

/* The left gutter is too narrow below this point; the top TOC still works. */
@media (max-width: 1219px) {
  body.blog-post-page #toc-nav {
    display: none !important;
  }
}

/* Float the back link in the empty left gutter on wide screens, above the
   vertically-centred section dots. Below this breakpoint it stays inline. */
@media (min-width: 1220px) {
  a.blog-back {
    position: fixed;
    left: calc((100vw - 800px) / 2 - 190px);
    top: 88px;
    z-index: 70;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    font-size: 14px;
    white-space: nowrap;
  }

  body.darkmode a.blog-back {
    color: #ccc;
  }
}

.blog-post-header {
  margin-bottom: 34px;
}

.blog-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  color: #999;
  font-size: 12.5px;
}

.blog-lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  color: #999;
  font-size: 12.5px;
  white-space: nowrap;
}

.blog-lang-switch .sep {
  color: #ccc;
}

.blog-lang-switch .active {
  color: #333;
  font-weight: 700;
}

.blog-lang-switch a {
  background-image: none;
  color: #888;
  text-decoration: none;
}

.blog-lang-switch a:hover,
.blog-lang-switch a:focus {
  background-image: none;
  color: #0FA0CE;
  text-decoration: underline;
}

body.darkmode .blog-lang-switch .active {
  color: #eee;
}

body.darkmode .blog-lang-switch a {
  color: #aaa;
}

body.darkmode .blog-lang-switch a:hover,
body.darkmode .blog-lang-switch a:focus {
  color: #6fd0ee;
}

.blog-post-header h1 {
  margin: 10px 0 0;
  font-family: 'DM Serif Display', 'Songti SC', 'Noto Serif SC', serif;
  font-size: 3.3rem;
  font-weight: 400;
  line-height: 1.4;
  color: #222;
}

.blog-post-summary {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 3px solid rgba(15, 160, 206, 0.45);
  color: #777;
  font-size: 15px;
  line-height: 1.75;
}

.blog-post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.blog-article {
  color: #333;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.85;
  overflow-wrap: break-word;
}

.blog-article h2,
.blog-article h3,
.blog-article h4 {
  font-family: 'DM Serif Display', 'Songti SC', 'Noto Serif SC', serif;
  font-weight: 400;
  color: #222;
}

.blog-article h2 {
  margin: 2.3em 0 0.8em;
  padding-bottom: 7px;
  border-bottom: 1px solid #ececef;
  font-size: 24px;
  line-height: 1.4;
}

.blog-article h3 {
  margin: 1.9em 0 0.6em;
  font-size: 19px;
  line-height: 1.5;
}

.blog-article h4 {
  margin: 1.6em 0 0.5em;
  font-size: 17px;
  line-height: 1.5;
}

.blog-article p {
  margin: 0 0 1.15em;
}

.blog-article strong {
  color: #111;
  font-weight: 700;
}

.blog-article ul,
.blog-article ol {
  margin: 0 0 1.15em;
  padding-left: 1.6em;
}

.blog-article li {
  margin: 0.35em 0;
}

.blog-article li > p {
  margin-bottom: 0.5em;
}

.blog-article blockquote {
  margin: 1.5em 0;
  padding: 12px 18px;
  border-left: 3px solid rgba(15, 160, 206, 0.55);
  border-radius: 0 8px 8px 0;
  background: rgba(15, 160, 206, 0.06);
  color: #555;
  font-style: normal;
}

.blog-article blockquote p:last-child {
  margin-bottom: 0;
}

.blog-article hr {
  margin: 2.2em 0;
  border: 0;
  border-top: 1px solid #ececef;
}

.blog-article code {
  padding: 2px 5px;
  border-radius: 4px;
  background: #f2f3f5;
  color: #444;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.87em;
}

.blog-article pre {
  margin: 1.4em 0;
  padding: 14px 16px;
  border: 1px solid #e7e8eb;
  border-radius: 10px;
  background: #f6f7f9;
  overflow-x: auto;
  line-height: 1.6;
}

.blog-article pre code {
  padding: 0;
  border-radius: 0;
  background: none;
  color: inherit;
  font-size: 13.5px;
}

.blog-article .table-wrap {
  margin: 1.4em 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.blog-article table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}

.blog-article th,
.blog-article td {
  padding: 8px 10px;
  border: 1px solid #e5e6e9;
  text-align: left;
  vertical-align: top;
}

.blog-article th {
  background: #f5f6f8;
  color: #333;
  font-weight: 700;
  white-space: nowrap;
}

.blog-article table a {
  white-space: nowrap;
  overflow-wrap: normal;
}

.blog-article img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border: 1px solid #eee;
  border-radius: 8px;
  box-shadow: none;
}

.blog-article p > em:only-child {
  color: #777;
  font-size: 14px;
}

body.darkmode .blog-article p > em:only-child {
  color: #999;
}

.blog-article .katex-display {
  margin: 1.2em 0;
  padding: 4px 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.blog-article a {
  overflow-wrap: anywhere;
}

/* Collapsible TOC at the top of the article, in the spirit of lilianweng.github.io. */
.post-toc {
  margin: 0 0 30px;
  padding: 0.4em;
  border: 1px solid #e6e7ea;
  border-radius: 12px;
  background: #f6f7f9;
  font-size: 14px;
  line-height: 1.7;
}

.post-toc summary {
  margin-inline-start: 14px;
  padding: 5px 4px;
  color: #333;
  font-weight: 600;
  cursor: pointer;
}

.post-toc summary:focus {
  outline: none;
}

.post-toc-inner {
  margin: 0 16px;
  padding: 6px 14px 10px;
}

.post-toc ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.post-toc li {
  margin: 3px 0;
}

.post-toc ul ul {
  margin-top: 3px;
  padding-left: 1.15em;
}

.post-toc a {
  background-image: none;
  color: #555;
  text-decoration: none;
}

.post-toc a:hover,
.post-toc a:focus {
  background-image: none;
  color: #0FA0CE;
  text-decoration: underline;
}

body.darkmode .post-toc {
  border-color: #3a3a40;
  background: #29292e;
}

body.darkmode .post-toc summary {
  color: #eee;
}

body.darkmode .post-toc a {
  color: #aaa;
}

body.darkmode .post-toc a:hover,
body.darkmode .post-toc a:focus {
  color: #6fd0ee;
}

.blog-article h2[id],
.blog-article h3[id] {
  scroll-margin-top: 1.5rem;
}

/* --------------------------------------------------------------------------
   Prev / next + footer
   -------------------------------------------------------------------------- */

.blog-post-nav {
  display: flex;
  gap: 16px;
  margin-top: 48px;
}

.blog-post-nav > a {
  flex: 1 1 0;
  display: block;
  padding: 14px 16px;
  border: 1px solid #e6e7ea;
  border-radius: 10px;
  background-image: none;
  color: #333;
  font-size: 13.5px;
  line-height: 1.55;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.blog-post-nav > a:hover,
.blog-post-nav > a:focus {
  border-color: #0FA0CE;
  background-image: none;
}

.blog-post-nav > a span {
  display: block;
  margin-bottom: 3px;
  color: #999;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.blog-post-next {
  text-align: right;
}

.blog-footer {
  margin-top: 56px;
  padding: 18px 0 6px;
  border-top: 1px solid #ececef;
  color: #a0a0a0;
  font-size: 12.5px;
  text-align: center;
}

.blog-footer p {
  margin: 0;
}

.blog-footer a {
  background-image: none;
  color: #999;
  text-decoration: none;
}

.blog-footer a:hover {
  color: #0FA0CE;
}

/* --------------------------------------------------------------------------
   Dark mode
   -------------------------------------------------------------------------- */

body.darkmode .blog-index-header h1,
body.darkmode .blog-post-header h1,
body.darkmode .blog-card-title,
body.darkmode .blog-article h2,
body.darkmode .blog-article h3,
body.darkmode .blog-article h4 {
  color: #eee;
}

body.darkmode .blog-index-header p,
body.darkmode .blog-count {
  color: #999;
}

body.darkmode .blog-card {
  border-color: #3a3a40;
  background-color: #29292e;
}

body.darkmode .blog-card:hover,
body.darkmode .blog-card:focus-visible {
  border-color: #39b8dd;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
}

body.darkmode .blog-card:hover .blog-card-title {
  color: #6fd0ee;
}

body.darkmode .blog-card-meta,
body.darkmode .blog-card-summary,
body.darkmode .blog-post-meta {
  color: #a3a3a3;
}

body.darkmode .blog-tag {
  background: #36363c;
  color: #b8b8c0;
}

body.darkmode .blog-draft {
  background: #4a3d17;
  color: #f0d27a;
}

body.darkmode .blog-post-summary {
  color: #aaa;
  border-left-color: rgba(57, 184, 221, 0.55);
}

body.darkmode .blog-article {
  color: #d6d6d6;
}

body.darkmode .blog-article strong {
  color: #fff;
}

body.darkmode .blog-article h2 {
  border-bottom-color: #3a3a40;
}

body.darkmode .blog-article blockquote {
  background: rgba(57, 184, 221, 0.08);
  color: #c4c4c4;
}

body.darkmode .blog-article hr {
  border-top-color: #3a3a40;
}

body.darkmode .blog-article code {
  background: #3a3a40;
  color: #ddd;
}

body.darkmode .blog-article pre {
  border-color: #3a3a40;
  background: #242428;
}

body.darkmode .blog-article th,
body.darkmode .blog-article td {
  border-color: #3d3d43;
}

body.darkmode .blog-article th {
  background: #333338;
  color: #eee;
}

body.darkmode .blog-article img {
  border-color: #3a3a40;
}

body.darkmode .blog-post-nav > a {
  border-color: #3a3a40;
  background-color: #29292e;
  color: #ddd;
}

body.darkmode .blog-post-nav > a:hover,
body.darkmode .blog-post-nav > a:focus {
  border-color: #39b8dd;
}

body.darkmode .blog-footer {
  border-top-color: #3a3a40;
  color: #777;
}

body.darkmode .blog-footer a {
  color: #888;
}

body.darkmode .blog-footer a:hover {
  color: #6fd0ee;
}

/* --------------------------------------------------------------------------
   Small screens
   -------------------------------------------------------------------------- */

@media (max-width: 768px) {
  .blog-index-header h1 {
    font-size: 3.0rem;
  }

  .blog-card {
    padding: 18px 18px 16px;
    border-radius: 12px;
  }

  .blog-card-title {
    font-size: 19px;
  }

  .blog-card-summary {
    font-size: 14px;
    -webkit-line-clamp: 2;
  }

  .blog-card-bottom {
    align-items: flex-end;
  }

  .blog-tag {
    padding: 2px 7px;
    font-size: 11px;
  }

  .blog-post-header h1 {
    font-size: 2.7rem;
  }

  .blog-post-summary {
    font-size: 14.5px;
  }

  .blog-article {
    font-size: 15.5px;
    line-height: 1.8;
  }

  .blog-article h2 {
    font-size: 21px;
  }

  .blog-article h3 {
    font-size: 18px;
  }

  .blog-article table {
    min-width: 640px;
    font-size: 13px;
  }

  .blog-post-nav {
    flex-direction: column;
  }

  .blog-post-next {
    text-align: left;
  }
}