:root {
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --bg-color: #ffffff;
  --bg-subtle: #f8fafc;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --card-border-hover: #cbd5e1;

  --text-color: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --theme-color: #1e40af;
  --theme-color-hover: #1d4ed8;
  --theme-color-light: rgba(30, 64, 175, 0.08);

  --accent-color: #1d4ed8;
  --accent-hover: #1e40af;

  --tag-bg: #f1f5f9;
  --tag-text: #334155;
  --tag-border: #e2e8f0;

  --code-bg: #f8fafc;
  --code-text: #0f172a;

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 6px -1px rgba(15, 23, 42, 0.06), 0 1px 4px -1px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 6px 16px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.1);
}

[data-theme="dark"] {
  --bg-color: #0d1117;
  --bg-subtle: #161b22;
  --card-bg: #161b22;
  --card-border: #30363d;
  --card-border-hover: #484f58;

  --text-color: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #7d8590;

  --theme-color: #58a6ff;
  --theme-color-hover: #79c0ff;
  --theme-color-light: rgba(88, 166, 255, 0.12);

  --accent-color: #58a6ff;
  --accent-hover: #79c0ff;

  --tag-bg: #21262d;
  --tag-text: #c9d1d9;
  --tag-border: #30363d;

  --code-bg: #161b22;
  --code-text: #e6edf3;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.55);
}

*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-body);
  font-size: 0.96rem;
  line-height: 1.65;
  margin: 0;
  padding: 44px 24px;
  transition: background-color 0.25s ease, color 0.25s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-color);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 16px 0;
  transition: color 0.25s ease;
}

h1 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.025em;
}

h2 {
  font-size: 1.32rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--theme-color);
  margin-top: 2.2rem;
  margin-bottom: 1rem;
  padding-bottom: 8px;
  border-bottom: 1.5px solid var(--card-border);
}

h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

h4 {
  font-size: 1.02rem;
  font-weight: 600;
}

p, ul, ol {
  margin: 0 0 1.2rem 0;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

strong {
  font-weight: 600;
  color: var(--text-color);
}

/* Layout */
.wrapper {
  max-width: 1060px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 48px;
  align-items: start;
}

/* Sidebar */
header.sidebar {
  position: sticky;
  top: 36px;
  text-align: center;
  padding: 30px 20px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

header.sidebar:hover {
  border-color: var(--card-border-hover);
}

.avatar-container {
  margin-bottom: 1.25rem;
}

.avatar {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--card-border);
  box-shadow: var(--shadow-xs);
  display: block;
  margin: 0 auto;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.avatar:hover {
  transform: scale(1.02);
  border-color: var(--theme-color);
}

.sidebar h1.name {
  font-family: var(--font-heading);
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
  color: var(--text-color);
}

.sidebar .position {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--theme-color);
  margin-bottom: 0.7rem;
  line-height: 1.4;
}

.sidebar .lab {
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
}

.sidebar .lab a {
  color: var(--text-secondary);
}

.sidebar .lab a:hover {
  color: var(--theme-color);
}

.sidebar .affiliation {
  font-size: 0.85rem;
  margin-bottom: 0.65rem;
}

.sidebar .affiliation a {
  color: var(--text-muted);
}

.sidebar .affiliation a:hover {
  color: var(--theme-color);
}

.email-wrapper {
  margin: 0.8rem 0 1.25rem 0;
}

.sidebar .email {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 6px 14px;
  background: var(--bg-subtle);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.sidebar .email:hover {
  background: var(--theme-color-light);
  border-color: var(--theme-color);
  color: var(--theme-color);
  text-decoration: none;
}

.social-icons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
}

.social-icons a,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  color: var(--text-secondary) !important;
  background-color: var(--bg-subtle);
  border: 1px solid var(--card-border);
  font-size: 1.15rem;
  transition: all 0.2s ease;
  cursor: pointer;
  text-decoration: none;
}

.social-icons a:hover,
.theme-toggle:hover {
  background-color: var(--theme-color);
  color: #ffffff !important;
  border-color: var(--theme-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xs);
}

.theme-toggle .theme-toggle__moon {
  display: inline-block;
}

.theme-toggle .theme-toggle__sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .theme-toggle__moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .theme-toggle__sun {
  display: inline-block;
}

/* Content */
main.content {
  min-width: 0;
}

.intro p {
  font-size: 0.97rem;
  line-height: 1.7;
  margin-bottom: 1.15rem;
  color: var(--text-secondary);
}

.intro p strong {
  color: var(--text-color);
}

.degree-highlights {
  padding-left: 22px;
  margin: 0.8rem 0 1.2rem 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.degree-highlights li {
  line-height: 1.6;
  color: var(--text-secondary);
}

.research-list {
  padding-left: 22px;
  margin: 0 0 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.research-list li {
  line-height: 1.6;
  color: var(--text-secondary);
}

.research-list li strong {
  color: var(--text-color);
}

.interest-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.interest-tag {
  background-color: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--tag-border);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
  transition: all 0.2s ease;
  cursor: default;
}

.interest-tag:hover {
  background-color: var(--theme-color-light);
  color: var(--theme-color);
  border-color: var(--theme-color);
}

/* News */
.news-list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-left: 24px;
  margin: 1.2rem 0 1.5rem 0;
}

.news-list::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--card-border);
  border-radius: 2px;
}

.news-item {
  position: relative;
  display: grid;
  grid-template-columns: 95px 1fr;
  gap: 16px;
  padding: 2px 0;
  align-items: start;
}

.news-item::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--card-bg);
  border: 2px solid var(--theme-color);
  transform: translateX(-50%);
  z-index: 1;
}

.news-item:first-child::before {
  background-color: var(--theme-color);
}

.news-date {
  font-family: var(--font-mono);
  background-color: var(--bg-subtle);
  color: var(--theme-color);
  border: 1px solid var(--card-border);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  text-align: center;
  white-space: nowrap;
}

.news-text {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.news-text strong {
  color: var(--text-color);
}

.news-item[hidden] {
  display: none;
}

.news-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 4px 0 1.5rem 0;
  padding: 5px 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
}

.news-toggle:hover {
  background-color: var(--theme-color);
  color: #ffffff;
  border-color: var(--theme-color);
}

.empty-notice {
  padding: 14px 18px;
  background-color: var(--bg-subtle);
  border: 1px dashed var(--card-border);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 1.5rem 0;
}

/* Education */
.edu-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  margin-bottom: 1.2rem;
  padding: 16px 18px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  box-shadow: var(--shadow-xs);
  transition: border-color 0.2s ease;
}

.edu-item:hover {
  border-color: var(--card-border-hover);
}

.edu-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--theme-color);
  background: var(--theme-color-light);
  padding: 4px 8px;
  border-radius: 6px;
  text-align: center;
  align-self: start;
}

.edu-degree {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-color);
  line-height: 1.35;
}

.edu-inst {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 3px;
}

.edu-detail {
  font-size: 0.86rem;
  margin-top: 6px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Footer */
footer.site-footer {
  grid-column: 1 / -1;
  text-align: center;
  padding: 32px 20px 10px 20px;
  margin-top: 40px;
  border-top: 1px solid var(--card-border);
}

.footer-content {
  max-width: 600px;
  margin: 0 auto;
}

.footer-copy {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.footer-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* Responsive */
@media screen and (max-width: 960px) {
  .wrapper {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  header.sidebar {
    position: static;
    padding: 24px 18px;
  }
}

@media screen and (max-width: 640px) {
  body {
    padding: 20px 14px;
  }

  .avatar {
    width: 140px;
    height: 140px;
  }

  .news-item {
    grid-template-columns: 75px 1fr;
    gap: 12px;
  }

  .news-date {
    font-size: 0.7rem;
    padding: 2px 6px;
  }

  .edu-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 14px 14px;
  }

  .edu-period {
    align-self: start;
    display: inline-block;
  }
}