:root {
  --bg: #eef2f6;
  --surface: #ffffff;
  --surface-alt: #f6f9fc;
  --border: #e0e6ef;
  --text: #1f2a37;
  --muted: #6b7280;
  --primary: #2f6fed;
  --primary-600: #2456c9;
  --shadow: 0 12px 30px rgba(31, 42, 55, 0.12);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --sidebar-width: 320px;
  --content-width: 980px;
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-serif: "Merriweather", "Georgia", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: linear-gradient(135deg, #f1f5fb 0%, #e7ecf5 50%, #f7f9fd 100%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  display: flex;
  min-height: 100vh;
  padding-left: var(--sidebar-width);
  width: 100%;
  max-width: calc(var(--sidebar-width) + var(--content-width));
  margin: 0 auto;
}

.sidebar {
  position: fixed;
  top: 0;
  left: calc(50% - (var(--sidebar-width) + var(--content-width)) / 2);
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 40px 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  overflow-y: auto;
  z-index: 100;
}

@media (max-width: 1300px) {
  .container {
    max-width: 100%;
    margin: 0;
  }

  .sidebar {
    left: 0;
  }
}

.avatar {
  width: 190px;
  height: 220px;
  border-radius: 18px;
  overflow: hidden;
  margin: 0 auto 20px;
  border: 5px solid white;
  box-shadow: 0 8px 20px rgba(31, 42, 55, 0.2);
  background: #fff;
}

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

.sidebar-header h1 {
  margin: 0 0 6px;
  font-size: 1.5rem;
  font-weight: 700;
}

.sidebar-header .position {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 4px;
}

.sidebar-header .institution {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 600;
  margin: 0 0 12px;
}

.sidebar-header .tagline {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
}

.contact-icons {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.contact-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  color: var(--muted);
  transition: all 0.2s;
  overflow: hidden;
}

.contact-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.contact-icon:hover {
  background: var(--surface-alt);
  color: var(--muted);
  border-color: var(--border);
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.nav-menu a {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--muted);
  transition: all 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
  background: rgba(47, 111, 237, 0.1);
  font-weight: 600;
}

.main-content {
  margin: 0 auto;
  padding: 40px 40px 40px 20px;
  width: 100%;
  max-width: 980px;
}

.main-content h1 {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  margin: 0 0 10px;
}

.subtitle {
  color: var(--muted);
  font-size: 1rem;
  margin: 0 0 18px;
  line-height: 1.6;
}

.section {
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 32px;
  margin-bottom: 32px;
  box-shadow: 0 10px 24px rgba(31, 42, 55, 0.08);
}

.section h2 {
  margin: 0 0 20px;
  font-size: 1.8rem;
  font-family: var(--font-serif);
}

.section h3 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.education-block {
  margin: 14px 0 16px;
  display: grid;
  gap: 6px;
}

.education-item {
  font-size: 0.92rem;
  color: var(--muted);
}

.education-more {
  display: none;
  margin-top: 4px;
  gap: 6px;
}

.education-more.is-open {
  display: grid;
}

.education-block .btn-secondary {
  padding: 0;
  border: none;
  background: transparent;
  color: var(--primary-600);
  font-size: 0.78rem;
  font-weight: 600;
  box-shadow: none;
  align-self: flex-start;
}

.education-block .btn-secondary:hover {
  background: transparent;
  box-shadow: none;
  transform: none;
  text-decoration: underline;
}

.intro-section {
  text-align: left;
}

.intro-title {
  margin: 0 0 12px;
  font-size: 2.2rem;
  font-family: var(--font-serif);
}

.intro-line {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 1rem;
}

.section p {
  line-height: 1.7;
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn:hover {
  background: var(--primary-600);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(47, 111, 237, 0.3);
}

.btn-secondary {
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(31, 42, 55, 0.15);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  background: #fff;
  display: grid;
  gap: 8px;
  transition: all 0.2s;
}

.card:hover {
  box-shadow: 0 8px 20px rgba(31, 42, 55, 0.12);
  transform: translateY(-2px);
}

.section-compact .card-grid {
  gap: 10px;
  grid-template-columns: 1fr;
}

.section-compact .card {
  border: none;
  background: transparent;
  padding: 0 0 3px;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  box-shadow: none;
}

.section-compact .card h3 {
  margin: 2px 0 4px;
}

.section-compact .card p {
  margin: 0 0 4px;
  font-size: 0.92rem;
  color: var(--muted);
}

.section-compact .card:hover {
  box-shadow: none;
  transform: none;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.card .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(47, 111, 237, 0.12);
  color: var(--primary);
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 600;
  width: fit-content;
}

.publication-list {
  display: grid;
  gap: 12px;
}

.publications-more {
  display: none;
  gap: 12px;
}

.publications-more.is-open {
  display: grid;
}

.publication-toggle {
  padding: 0;
  border: none;
  background: transparent;
  color: var(--primary-600);
  font-size: 0.78rem;
  font-weight: 600;
  box-shadow: none;
  align-self: flex-start;
}

.publication-toggle:hover {
  background: transparent;
  box-shadow: none;
  transform: none;
  text-decoration: underline;
}

.publication-category {
  font-weight: 600;
  font-size: 0.95rem;
  margin-top: 4px;
  margin-bottom: 2px;
  color: var(--text);
}

.publication-item {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  padding: 0 0 12px;
  display: grid;
  gap: 6px;
}

.publication-item:hover {
  box-shadow: none;
  transform: none;
}

.publication-item h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--text);
}

.publication-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

.publication-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.pdf-link {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #fff;
}

.pdf-link img {
  width: 18px;
  height: 18px;
  display: block;
}

.link-placeholder {
  flex: 0 0 auto;
  font-size: 0.7rem;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--primary-600);
  background: #fff;
}

.project-list {
  display: grid;
  gap: 12px;
}

.project-item {
  border-bottom: 1px solid var(--border);
  padding: 0 0 12px;
  display: grid;
  gap: 6px;
}

.project-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.project-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

.project-description {
  font-size: 0.92rem;
  color: var(--muted);
}

.simple-list {
  display: grid;
  gap: 8px;
}

.simple-item {
  border-bottom: 1px solid var(--border);
  padding: 0 0 8px;
  font-size: 0.92rem;
  color: var(--muted);
}

.service-item {
  border-bottom: none;
  padding: 0 0 4px;
  font-size: 0.92rem;
  color: var(--muted);
}

.honor-item {
  border-bottom: none;
  padding: 0 0 4px;
  font-size: 0.92rem;
  color: var(--muted);
}

.simple-subtitle {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  margin-top: 4px;
  margin-bottom: 2px;
}

.publication-venue {
  font-size: 0.82rem;
  color: var(--primary-600);
}

.publication-authors {
  font-size: 0.82rem;
  color: var(--muted);
}

.publication-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(47, 111, 237, 0.1);
  color: var(--primary);
  border: 1px solid rgba(47, 111, 237, 0.2);
  font-weight: 600;
}

.tag-inline {
  font-size: 0.75em;
  padding: 2px 8px;
  margin-left: 8px;
  vertical-align: middle;
}


@media (max-width: 960px) {
  .container {
    flex-direction: column;
    padding-left: 0;
  }

  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .main-content {
    margin-left: 0;
    padding: 30px 24px;
  }
}

@media (max-width: 640px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    padding: 30px 20px;
  }

  .main-content {
    padding: 24px 16px;
  }

  .section {
    padding: 24px 20px;
  }
}