:root {
  --bg: #ffffff;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #4b5563;
  --line: #e5e7eb;
  --accent: #1d4ed8;
  --accent-soft: #eff6ff;
  --sticky-offset: 64px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: min(960px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 6px rgba(15, 23, 42, 0.06);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.9rem 0;
}

.site-title {
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--text);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.nav-link {
  text-decoration: none;
  color: var(--muted);
  padding: 0.35rem 0.55rem;
  border-radius: 8px;
  transition: all 150ms ease;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}

.content {
  position: relative;
  z-index: 1;
  padding: 2rem 0 3rem;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h1 {
  margin-top: 0;
}

.card {
  background: var(--card);
  border: none;
  border-radius: 14px;
  padding: 1rem 1.1rem;
  margin: 0.8rem 0;
  box-shadow: none;
}

.item-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.item-list li {
  border-left: 3px solid var(--line);
  padding: 0.4rem 0 0.4rem 0.9rem;
  margin: 0.8rem 0;
}

.item-date {
  color: var(--muted);
  font-size: 0.95rem;
}

.news-detail-link {
  margin-left: 0.45rem;
}

.meta {
  color: var(--muted);
  margin-top: -0.3rem;
}

.post {
  max-width: 100%;
}

.post img,
.img-fluid {
  max-width: 100%;
  height: auto;
}

.post mjx-container[jax="CHTML"][display="true"] {
  position: relative;
  z-index: 1;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 0.1rem;
}

.blog-figure {
  margin: 0.9rem auto 1rem;
}

.blog-figure figcaption {
  margin-top: 0.35rem;
  font-size: 0.86rem;
  color: var(--muted);
  text-align: center;
}

.text-center {
  text-align: center;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin-left: -0.45rem;
  margin-right: -0.45rem;
}

.col-md-6 {
  width: 100%;
  padding-left: 0.45rem;
  padding-right: 0.45rem;
}

.w-75 {
  width: min(75%, 760px);
}

.w-100 {
  width: 100%;
}

.software-card {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 1rem;
  align-items: center;
}

.software-logo-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
}

.software-logo {
  width: 100%;
  max-width: 170px;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #ffffff;
}

.software-body {
  min-width: 0;
}

.software-name {
  margin: 0 0 0.35rem;
  font-size: 1.18rem;
}

.software-description {
  margin: 0;
  color: var(--muted);
}

.software-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.blog-intro {
  margin: 0 0 0.9rem;
  color: var(--muted);
}

.blog-tag-cloud-wrap {
  margin: 0 0 1.2rem;
  position: sticky;
  top: var(--sticky-offset);
  z-index: 24;
  border: none;
  border-radius: 0;
  background: #ffffff;
  backdrop-filter: none;
  padding: 0.4rem 0 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.blog-tag-cloud-title {
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.blog-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem;
  margin: 0;
}

.blog-tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1.5px solid #d1d5db;
  border-radius: 999px;
  background: #f8fafc;
  color: #374151;
  padding: 0.38rem 1rem;
  font-size: 0.93rem;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  transition: all 160ms ease;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.blog-tag-chip:hover {
  background: var(--accent-soft);
  border-color: #93c5fd;
  color: var(--accent);
  box-shadow: 0 2px 8px rgba(29, 78, 216, 0.10);
}

.blog-tag-chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  box-shadow: 0 3px 10px rgba(29, 78, 216, 0.22);
}

.blog-tag-count {
  font-size: 0.78rem;
  opacity: 0.80;
  background: rgba(0,0,0,0.07);
  border-radius: 999px;
  padding: 0.05rem 0.42rem;
  line-height: 1.4;
}

.blog-tag-chip.is-active .blog-tag-count {
  background: rgba(255,255,255,0.22);
}

.blog-filter-status {
  margin: 0.38rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

#blog-post-list {
  display: grid;
  gap: 0.85rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

#blog-post-list li {
  border-left: none;
  padding: 0;
  margin: 0;
}

.blog-post-item {
  min-width: 0;
  border: none;
  border-radius: 14px;
  background: var(--card);
  padding: 0.55rem 0.2rem;
  box-shadow: none;
  transition: background 160ms ease;
}

.blog-post-item:hover {
  transform: none;
  border-color: transparent;
  background: #f8fafc;
  box-shadow: none;
}

/* 目录式标题行 */
.blog-post-toc-row {
  display: flex;
  align-items: baseline;
  gap: 0;
  width: 100%;
  overflow: hidden;
}

.blog-post-toc-title {
  flex-shrink: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
  max-width: 70%;
}

.blog-post-toc-title:hover {
  color: var(--accent);
}

.blog-post-toc-dots {
  flex: 1;
  min-width: 1rem;
  border-bottom: 1.5px dotted #cbd5e1;
  margin: 0 0.4rem 0.18rem;
}

.blog-post-toc-date {
  flex-shrink: 0;
  color: var(--muted);
  font-size: 0.88rem;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.blog-post-meta {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.84rem;
}

.blog-post-meta-dot {
  opacity: 0.65;
}

.blog-post-title-row {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.blog-post-title {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.35;
}

.blog-post-title a {
  color: var(--text);
  text-decoration: none;
}

.blog-post-title a:hover {
  color: var(--accent);
}

.blog-post-excerpt {
  margin: 0;
  color: #4b5563;
  font-size: 0.95rem;
  line-height: 1.58;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-post-footer {
  margin-top: 0.3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.blog-post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.blog-post-tag {
  border: 1px solid #d1d5db;
  border-radius: 999px;
  background: #f9fafb;
  color: #4b5563;
  font-size: 0.78rem;
  padding: 0.18rem 0.6rem;
  line-height: 1.2;
  cursor: pointer;
  transition: all 150ms ease;
}

.blog-post-tag:hover {
  background: var(--accent-soft);
  border-color: #93c5fd;
  color: var(--accent);
}

.blog-read-link {
  text-decoration: none;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  padding: 0.17rem 0.58rem;
  background: #f8fbff;
  transition: all 150ms ease;
}

.blog-read-link:hover {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
}

.publication-list {
  display: grid;
  gap: 0.8rem;
}

.publication-year-toc {
  margin: 0 0 1rem;
  position: sticky;
  top: var(--sticky-offset);
  z-index: 30;
  background: #ffffff;
  border: none;
  border-radius: 12px;
  backdrop-filter: none;
  padding: 0.55rem 0.7rem;
}

.publication-year-toc-title {
  margin: 0 0 0.3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.publication-year-toc-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.publication-year-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--accent);
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  background: #f8fbff;
  padding: 0.18rem 0.62rem;
  font-size: 0.85rem;
}

.publication-year-link:hover {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
}

.publication-year-group + .publication-year-group {
  margin-top: 1.25rem;
}

.publication-year-group {
  scroll-margin-top: calc(var(--sticky-offset) + 4.9rem);
}

.publication-year-heading {
  margin: 0.2rem 0 0.5rem;
  font-size: 1.15rem;
}

.publication-card {
  display: grid;
  grid-template-columns: 185px 1fr;
  gap: 0.95rem;
  align-items: start;
}

.publication-preview {
  width: 185px;
  height: 128px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--line);
  background: #f8fafc;
}

.publication-body {
  min-width: 0;
}

.publication-links {
  margin: 0.45rem 0 0;
}

.publication-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.55rem;
}

.publication-venue-line {
  margin: 0.28rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.publication-metrics {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.publication-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
  border: none;
  border-radius: 8px;
  background: #f3f4f6;
  padding: 0.2rem 0.55rem;
  cursor: default;
  user-select: none;
}

.publication-tag-label {
  color: var(--text);
  font-weight: 600;
}

.publication-tag-value {
  color: #334155;
  font-weight: 600;
}

.pub-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  background: #ffffff;
  color: var(--accent);
  text-decoration: none;
  padding: 0.22rem 0.6rem;
  font-size: 0.8rem;
  line-height: 1.2;
  cursor: pointer;
  transition: all 150ms ease;
}

.pub-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  text-decoration: none;
}

.pub-btn.is-disabled {
  background: #f1f5f9;
  border-color: #d1d5db;
  color: #94a3b8;
  cursor: not-allowed;
}

.publication-detail {
  display: none;
  margin-top: 0.55rem;
  padding: 0.58rem 0.68rem;
  border: none;
  border-radius: 10px;
  background: #f3f4f6;
  color: var(--text);
}

.publication-detail.is-open {
  display: block;
}

.publication-detail p {
  margin: 0;
}

.publication-detail pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.82rem;
  line-height: 1.45;
}

/* ── Teaching ── */

.teaching-back {
  margin-bottom: 0.6rem;
}

.teaching-back a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}

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

.teaching-subtitle {
  margin: 0.1rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.teaching-meta-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.4rem;
  margin: 0.9rem 0 0.5rem;
}

.teaching-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.teaching-meta-label {
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.teaching-meta-value {
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
}

.teaching-repo {
  margin: 0.6rem 0 0;
}

.teaching-schedule-heading {
  margin: 1.8rem 0 0.6rem;
  font-size: 1.15rem;
}

.teaching-schedule {
  display: grid;
  gap: 0.6rem;
}

.teaching-lecture-header {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.teaching-lecture-num {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.88rem;
  margin-top: 0.1rem;
}

.teaching-lecture-topic {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

.teaching-lecture-desc {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.teaching-lecture-materials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.55rem;
  padding-left: 3.5rem;
}

/* Teaching index cards */

.teaching-course-card {
  padding: 1.2rem 1.3rem;
}

.teaching-course-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.teaching-course-title:hover {
  color: var(--accent);
}

.teaching-course-subtitle {
  margin: 0.1rem 0 0.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.teaching-course-overview {
  margin: 0 0 0.7rem;
  color: #4b5563;
  font-size: 0.94rem;
  line-height: 1.58;
}

.teaching-course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.teaching-meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--muted);
  border: none;
  border-radius: 8px;
  background: #f3f4f6;
  padding: 0.2rem 0.55rem;
}

.teaching-course-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.teaching-table-card {
  padding: 0.9rem 1rem;
}

.teaching-table-wrap {
  width: 100%;
  overflow-x: auto;
}

.teaching-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

.teaching-table th,
.teaching-table td {
  border-bottom: 1px solid var(--line);
  padding: 0.75rem 0.7rem;
  vertical-align: top;
  text-align: left;
}

.teaching-table thead th {
  font-size: 0.82rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: #f8fafc;
}

.teaching-table .teaching-course-overview {
  margin: 0 0 0.45rem;
}

.teaching-topic-list {
  margin: 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.2rem;
  color: #334155;
  font-size: 0.88rem;
}

.teaching-topic-link {
  display: inline-flex;
  align-items: center;
  margin-left: 0.38rem;
  padding: 0.04rem 0.4rem;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  text-decoration: none;
  font-size: 0.74rem;
  font-weight: 600;
  line-height: 1.4;
  border: 1px solid #bfdbfe;
}

.teaching-topic-link:hover {
  background: #dbeafe;
  color: #1e3a8a;
}

.teaching-schedule-lines {
  display: grid;
  gap: 0.2rem;
  color: #334155;
  font-size: 0.9rem;
}

.teaching-table td .teaching-course-actions {
  min-width: 150px;
}

.teaching-lang-toggle {
  display: flex;
  gap: 0.45rem;
  margin: 0 0 0.5rem;
}

.teaching-lang-btn {
  min-width: 3rem;
}

.teaching-lang-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

#teaching-page .teaching-lang-ru {
  display: none;
}

#teaching-page[data-teaching-lang="ru"] .teaching-lang-en {
  display: none;
}

#teaching-page[data-teaching-lang="ru"] .teaching-lang-ru {
  display: inline;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.2rem 0 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  :root {
    --sticky-offset: 58px;
  }

  .header-inner {
    align-items: flex-start;
  }

  .site-nav {
    width: 100%;
  }

  .blog-tag-cloud-wrap {
    top: var(--sticky-offset);
    padding: 0.5rem 0.55rem;
  }

  .software-card {
    grid-template-columns: 1fr;
  }

  .software-logo {
    max-width: 190px;
  }

  .blog-post-item {
    padding: 0.78rem 0.82rem;
  }

  .blog-post-title {
    font-size: 1.02rem;
  }

  .blog-post-footer {
    align-items: flex-start;
  }

  .publication-card {
    grid-template-columns: 1fr;
  }

  .publication-preview {
    width: 100%;
    height: 230px;
  }

  .teaching-meta-grid {
    flex-direction: column;
    gap: 0.4rem;
  }

  .teaching-lecture-header {
    flex-direction: column;
    gap: 0.35rem;
  }

  .teaching-lecture-materials {
    padding-left: 0;
  }

  .teaching-table-card {
    padding: 0.6rem 0.7rem;
  }

  .teaching-table th,
  .teaching-table td {
    padding: 0.62rem 0.55rem;
  }

  .w-75 {
    width: 100%;
  }
}

@media (min-width: 768px) {
  .col-md-6 {
    width: 50%;
  }
}