/* ============================================
   Academic Personal Page — Minimal Scholar Style
   ============================================ */

:root {
  --bg: #fafaf9;
  --text: #3c4043;
  --text-light: #5f6368;
  --heading: #202124;
  --accent: #1a56db;
  --accent-hover: #174ea6;
  --accent-light: #e8f0fe;
  --accent-warm: #fef7e0;
  --card-bg: #f5f4f1;
  --card-hover: #efeeeb;
  --border: #dadce0;
  --border-light: #e8eaed;
  --sidebar-width: 300px;
  --content-max: 720px;
  --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", monospace;
}

* { margin:0; padding:0; box-sizing:border-box; }

html { font-size:16px; scroll-behavior:smooth; height:100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

/* ============================================
   Layout
   ============================================ */

.page-wrapper {
  display: flex;
  max-width: 1200px;
  width: 88%;
  margin: 0 auto;
  min-height: 100vh;
  padding: 0 24px;
  gap: 48px;
}

/* ============================================
   Sidebar (Left)
   ============================================ */

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  padding: 40px 20px 40px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  text-align: center;
}

.sidebar-photo {
  width: 140px;
  height: 140px;
  border-radius: 16px;
  background: var(--card-bg);
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 48px;
  overflow: hidden;
}

.sidebar-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sidebar-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 2px;
  letter-spacing: -0.3px;
}

.sidebar-title {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 2px;
  font-weight: 500;
}

.sidebar-school {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 16px;
}

/* Vertical text links */
.sidebar-links-v {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  margin-bottom: 24px;
  font-size: 13px;
}

.sidebar-link-v {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 4px 6px;
  border-radius: 6px;
  color: var(--text-light);
  transition: all 0.15s;
  text-decoration: none;
}

.sidebar-link-v:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.sidebar-link-v svg { flex-shrink: 0; }

/* Research Interests Card */
.sidebar-card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 16px 18px;
  text-align: left;
  border: 1px solid var(--border-light);
}

.sidebar-card-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.sidebar-card li {
  font-size: 13.5px;
  color: var(--text);
  line-height: 1.7;
  list-style: none;
  padding: 3px 0 3px 14px;
  position: relative;
}

.sidebar-card li::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent);
}

/* ============================================
   Main Content (Right)
   ============================================ */

.main-content {
  flex: 1;
  min-width: 0;
  padding-top: 48px;
  padding-bottom: 48px;
}

/* Section Nav */
.section-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 48px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}

.section-nav {
  justify-content: space-between;
}

.section-nav a {
  padding: 8px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-light);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all 0.15s;
  flex: 1;
  text-align: center;
}

.section-nav a:hover,
.section-nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Language Toggle */
.lang-toggle {
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-light);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all 0.15s;
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================
   Sections
   ============================================ */

.content-section {
  margin-bottom: 56px;
  scroll-margin-top: 24px;
}

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 20px;
  letter-spacing: -0.2px;
}

/* ---- About ---- */
.about-text {
  font-size: 14.5px;
  color: var(--text);
  line-height: 1.8;
}

.about-text p { margin-bottom: 14px; }

.about-text p:last-child { margin-bottom: 0; }

/* ---- Blog ---- */
.blog-entries {
  display: flex;
  flex-direction: column;
}

.blog-entry {
  display: flex;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
}

.blog-entry:last-child { border-bottom: none; }

.blog-entry-year {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-light);
  width: 52px;
  padding-top: 1px;
  flex-shrink: 0;
}

.blog-entry-body { flex: 1; min-width: 0; }

.blog-entry-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 2px;
  transition: color 0.15s;
}

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

.blog-entry-meta {
  font-size: 12px;
  color: var(--text-light);
  display: flex;
  gap: 12px;
}

.blog-entry-excerpt {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 2px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---- Publications ---- */
.pub-list { display: flex; flex-direction: column; gap: 14px; }

.pub-entry {
  padding: 14px 18px;
  background: var(--card-bg);
  border-radius: 8px;
  border: 1px solid var(--border-light);
  font-size: 13.5px;
  line-height: 1.6;
  transition: background 0.15s;
}

.pub-entry:hover {
  background: var(--card-hover);
}

.pub-entry-title {
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 2px;
}

.pub-entry-venue {
  font-style: italic;
  color: var(--text-light);
  font-size: 12px;
  margin-bottom: 2px;
}

.pub-entry-doi {
  font-size: 12px;
  font-family: var(--font-mono);
  word-break: break-all;
}

/* ---- Honors ---- */
.honor-list { display: flex; flex-direction: column; gap: 12px; }

.honor-entry {
  display: flex;
  gap: 16px;
  padding: 14px 18px;
  background: var(--card-bg);
  border-radius: 8px;
  border: 1px solid var(--border-light);
  transition: background 0.15s;
}

.honor-entry:hover { background: var(--card-hover); }

.honor-entry-year {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-light);
  width: 120px;
  flex-shrink: 0;
  padding-top: 1px;
}

.honor-entry-body { flex: 1; }

.honor-entry-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--heading);
}

.honor-entry-desc {
  font-size: 13px;
  color: var(--text-light);
}

/* Blog link at bottom */
.blog-more {
  margin-top: 12px;
  font-size: 13px;
}

/* ============================================
   Blog Post Page (updates)
   ============================================ */

.blog-page {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px;
}

.blog-page .back-link {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 20px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: all 0.15s;
  text-decoration: none;
}

.blog-page .back-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

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

.blog-page-header {
  margin-bottom: 36px;
}

.blog-page-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--heading);
  letter-spacing: -0.5px;
  line-height: 1.3;
  margin-bottom: 8px;
}

.blog-page-meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.blog-page-toc {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 18px;
  background: var(--card-bg);
  border-radius: 8px;
  margin-bottom: 32px;
  border: 1px solid var(--border-light);
}

.blog-page-toc a {
  font-size: 13px;
  color: var(--text-light);
  font-weight: 500;
}

.blog-page-toc a:hover { color: var(--accent); }

/* Post Body */
.post-body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.post-body h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--heading);
  margin: 44px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.2px;
}

.post-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--heading);
  margin: 32px 0 10px;
}

.post-body h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--heading);
  margin: 24px 0 8px;
}

.post-body p { margin-bottom: 16px; }

.post-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-body ul, .post-body ol {
  margin: 12px 0;
  padding-left: 22px;
}

.post-body li { margin-bottom: 6px; }

.post-body li::marker { color: var(--accent); }

.post-body blockquote {
  border-left: 2px solid var(--accent);
  padding: 10px 16px;
  margin: 20px 0;
  background: var(--card-bg);
  border-radius: 0 6px 6px 0;
  color: var(--text-light);
  font-size: 14px;
}

.post-body blockquote p { margin-bottom: 0; }

.post-body code {
  background: var(--card-bg);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  font-weight: 500;
}

.post-body pre {
  background: #1e1e2e;
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  margin: 20px 0;
}

.post-body pre code {
  background: none;
  color: #cdd6f4;
  padding: 0;
  font-size: 13px;
  line-height: 1.7;
  font-weight: 400;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 13px;
}

.post-body th {
  background: var(--card-bg);
  font-weight: 600;
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--border);
  color: var(--heading);
}

.post-body td {
  padding: 8px 14px;
  border: 1px solid var(--border);
}

.post-body img {
  max-width: 100%;
  border-radius: 8px;
  margin: 20px 0;
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 36px 0;
}

.post-body strong { color: var(--heading); }

/* Post Nav */
.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  gap: 16px;
}

.post-nav a {
  font-size: 13px;
  color: var(--text-light);
  font-weight: 500;
}

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

/* ============================================
   Blog List Page
   ============================================ */

.blog-list-page {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px;
}

.blog-list-header {
  margin-bottom: 36px;
}

.blog-list-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--heading);
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}

.blog-list-subtitle {
  font-size: 14px;
  color: var(--text-light);
}

/* Category Filters */
.filter-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 5px 14px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-light);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all 0.15s;
}

.filter-btn:hover { border-color: var(--accent); color: var(--accent); }

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.blog-list-entries {
  display: flex;
  flex-direction: column;
}

.blog-list-entry {
  display: flex;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
}

.blog-list-entry:last-child { border-bottom: none; }

.blog-list-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-light);
  min-width: 84px;
  flex-shrink: 0;
  padding-top: 2px;
}

.blog-list-body { flex: 1; min-width: 0; }

.blog-list-entry-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 4px;
  transition: color 0.15s;
  letter-spacing: -0.2px;
}

.blog-list-entry:hover .blog-list-entry-title { color: var(--accent); }

.blog-list-tags {
  display: flex;
  gap: 6px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.blog-list-tag {
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  padding: 1px 8px;
  border-radius: 4px;
}

.blog-list-excerpt {
  font-size: 13px;
  color: var(--text-light);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-list-meta {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--text-light);
  max-width: 1060px;
  margin: 0 auto;
}

/* ============================================
   404
   ============================================ */

.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.error-code {
  font-size: 80px;
  font-weight: 800;
  color: var(--heading);
  line-height: 1;
  margin-bottom: 8px;
}

.error-message {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 20px;
}

.error-link {
  font-size: 13px;
  color: var(--accent);
}

/* ============================================
   Language Toggle
   ============================================ */

:root.lang-en .zh { display: none; }
:root:not(.lang-en) .en { display: none; }

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 800px) {
  .page-wrapper {
    flex-direction: column;
    gap: 0;
    padding: 0 16px;
  }

  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    padding-top: 32px;
    padding-bottom: 0;
    text-align: center;
  }

  .sidebar-photo { width: 100px; height: 100px; border-radius: 12px; margin-bottom: 14px; }
  .sidebar-name { font-size: 18px; }
  .sidebar-card { text-align: center; }
  .sidebar-card li { text-align: center; padding-left: 0; }
  .sidebar-card li::before { display: none; }

  .main-content { padding-top: 24px; }
  .section-nav { margin-bottom: 32px; gap: 2px; }
  .section-nav a { padding: 6px 10px; font-size: 12px; }

  .content-section { margin-bottom: 40px; }
  .section-title { font-size: 16px; }

  .blog-page,
  .blog-list-page { padding: 32px 16px; }

  .blog-page-title,
  .blog-list-title { font-size: 22px; }

  .lang-toggle { top: 16px; right: 12px; }
}

@media (max-width: 480px) {
  .sidebar-photo { width: 80px; height: 80px; }
  .blog-entry { flex-direction: column; gap: 2px; }
  .honor-entry { flex-direction: column; gap: 2px; }
  .blog-entry-year,
  .honor-entry-year { min-width: 0; }
  .blog-list-entry { flex-direction: column; gap: 2px; }
  .blog-list-date { min-width: 0; }
}