/* ===== Main Site Styles (loads after shared.css) ===== */

:root {
  --container-width: 860px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

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

/* ===== Layout ===== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  padding: 48px 0 0;
  text-align: center;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 1px;
}

/* ===== Navigation ===== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  margin-top: 32px;
}

.site-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
  padding: 12px 0;
}

.nav-link {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.3px;
  user-select: none;
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-border-light);
}

.nav-link.active {
  color: var(--color-accent);
  background: var(--color-tag-bg);
  font-weight: 600;
}

/* ===== Content Sections ===== */
.content-section {
  display: none;
  padding: 48px 0 80px;
  animation: fadeIn 0.35s ease;
}

.content-section.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Section Titles ===== */
.section-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 36px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-text);
}

/* ===== Home / Profile ===== */
.profile-container {
  display: flex;
  gap: 48px;
  align-items: flex-start;
  margin-bottom: 40px;
}

.profile-image img {
  width: 240px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.profile-info h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.profile-info p {
  margin-bottom: 10px;
  font-size: 1.02rem;
  line-height: 1.75;
}

.profile-info strong {
  font-weight: 600;
}

.bio {
  text-align: justify;
  line-height: 1.85;
  font-size: 1.02rem;
}

.bio p {
  margin-bottom: 16px;
}

/* ===== Research ===== */
.research-item {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border-light);
}

.research-item:last-child {
  border-bottom: none;
}

.research-item h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.5;
}

.research-item .authors,
.research-item .coauthors {
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  font-style: italic;
  font-size: 0.9rem;
}

.research-item .coauthors::before {
  content: "(";
}

.research-item .coauthors::after {
  content: ")";
}

.research-item .journal {
  color: var(--color-text-muted);
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.research-item .conference {
  color: var(--color-text-secondary);
  margin-top: 6px;
  font-size: 0.9rem;
}

.research-item h3 a {
  color: var(--color-accent);
  text-decoration: none;
}

.research-item h3 a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.research-item .description {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== Blog ===== */
.wiki-link-hint {
  font-size: 0.92rem;
  color: var(--color-text-light);
  margin-bottom: 18px;
}

.wiki-link-hint a {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.wiki-link-hint a:hover {
  border-bottom-color: var(--color-primary);
}

.blog-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: all var(--transition);
  cursor: pointer;
}

.blog-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.blog-card .blog-date {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.blog-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.5;
}

.blog-card .blog-excerpt {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.blog-card .blog-tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.blog-tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 999px;
}

/* Blog Post Detail */
.blog-post-detail {
  line-height: 1.85;
}

.blog-post-detail .post-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 32px;
}

.blog-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  color: var(--color-accent);
  margin-bottom: 24px;
  cursor: pointer;
  transition: color var(--transition);
}

.blog-back-link:hover {
  color: var(--color-accent-hover);
}

.blog-empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: 60px 0;
  font-style: italic;
}

/* ===== Blog Table of Contents ===== */
.blog-toc {
  position: fixed;
  top: 160px;
  left: calc(50% + var(--container-width) / 2 + 40px);
  width: 200px;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
  font-size: 0.8rem;
  line-height: 1.5;
}

.blog-toc:empty {
  display: none;
}

.blog-toc .toc-title {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  padding-bottom: 10px;
}

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

.blog-toc .toc-list li {
  margin: 0;
}

.blog-toc .toc-list a {
  display: block;
  padding: 4px 0 4px 12px;
  color: var(--color-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.blog-toc .toc-list a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.blog-toc .toc-list a.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.blog-toc .toc-list .toc-h3 { padding-left: 24px; }
.blog-toc .toc-list .toc-h4 { padding-left: 36px; }

/* ===== Responsive ===== */
@media (max-width: 1200px) {
  .blog-toc {
    display: none;
  }
}

@media (max-width: 768px) {
  .site-title {
    font-size: 1.8rem;
  }

  .site-nav ul {
    gap: 2px;
  }

  .nav-link {
    padding: 6px 12px;
    font-size: 0.82rem;
  }

  .profile-container {
    flex-direction: column;
    align-items: center;
    gap: 28px;
  }

  .profile-image img {
    width: 200px;
  }

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

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

  .content-section {
    padding: 32px 0 60px;
  }

  .blog-card {
    padding: 18px 20px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

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

  .nav-link {
    padding: 5px 10px;
    font-size: 0.78rem;
  }

  .profile-image img {
    width: 160px;
  }
}