/* Modern Personal Academic Page Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap');

:root {
  /* Light Theme Color Palette */
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.88);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --highlight-red: #dc2626;
  --highlight-bg: #fef2f2;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Dark Theme Color Palette */
  --bg-color: #0b0f19;
  --card-bg: #161e2e;
  --nav-bg: rgba(15, 23, 42, 0.88);
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-color: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #a855f7 100%);
  --highlight-red: #f87171;
  --highlight-bg: rgba(220, 38, 38, 0.12);
  --border-color: #1e293b;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

/* Layout Container */
.container {
  max-width: 1050px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navigation Bar */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background-color: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--card-bg);
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: rotate(15deg);
}

/* Main Content Spacing */
main {
  padding-top: 150px;
  padding-bottom: 4rem;
}

main,
section,
.hero-section,
.section-block {
  scroll-margin-top: 90px;
}

/* Hero & Profile Section */
.hero-section {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-top: 5rem;
  margin-bottom: 3.5rem;
  padding: 2rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.profile-avatar-container {
  position: relative;
  text-align: center;
}

.profile-avatar {
  width: 220px;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 3px solid var(--card-bg);
  outline: 2px solid var(--border-color);
  transition: transform var(--transition-normal), outline-color var(--transition-normal);
}

.profile-avatar:hover {
  transform: translateY(-4px);
  outline-color: var(--accent-color);
}

.profile-info {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.name-heading {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.2;
}

.title-subheading {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--accent-color);
}

.affiliation-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.email-box {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-color);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-secondary);
  width: fit-content;
  margin-top: 0.25rem;
}

.email-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--bg-color);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  vertical-align: middle;
  margin: 0 0.2rem;
}

/* Social Buttons Row */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.75rem;
}

.btn-social {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-social:hover {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* Announcement Box */
.announcement-box {
  background: var(--highlight-bg);
  border-left: 4px solid var(--highlight-red);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: 3rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.announcement-title {
  font-weight: 700;
  color: var(--highlight-red);
  font-size: 1rem;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Section Common Styling */
.section-block {
  margin-bottom: 3.5rem;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.bio-paragraph {
  font-size: 1.02rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.bio-paragraph a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
}

.bio-paragraph a:hover {
  text-decoration: underline;
}

/* Research Thrust Cards */
.thrust-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.thrust-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.thrust-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.thrust-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.thrust-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

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

.thrust-keywords {
  margin-top: auto;
  padding-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.keyword-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

/* Lab Mission Box */
.mission-box {
  margin-top: 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--card-bg);
  border: 1px dashed var(--accent-color);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.mission-highlight {
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Publication Filters */
.pub-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.filter-btn {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
  box-shadow: var(--shadow-sm);
}

/* Publication List */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.pub-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.5rem;
  background: var(--card-bg);
  padding: 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

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

.pub-thumb-box {
  width: 100%;
  height: 120px;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-color);
}

.pub-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.pub-item:hover .pub-thumb {
  transform: scale(1.05);
}

.pub-content {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.pub-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.pub-authors {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pub-authors .me {
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: var(--accent-color);
  text-underline-offset: 2px;
}

.pub-venue {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-style: italic;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge-venue {
  font-style: normal;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--accent-color);
  color: #ffffff;
}

.badge-award {
  font-style: normal;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--highlight-red);
  color: #ffffff;
}

/* Pub Link Buttons */
.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.4rem;
}

.pub-btn {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.pub-btn:hover {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
}

/* BibTeX Drawer */
.bibtex-box {
  display: none;
  margin-top: 0.5rem;
  padding: 0.75rem;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
}

.bibtex-box.show {
  display: block;
  animation: fadeIn 0.2s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* News Section Timeline */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.news-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  font-size: 0.95rem;
  align-items: baseline;
}

.news-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-color);
  background: var(--card-bg);
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-align: center;
}

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

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

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
  margin-top: 4rem;
  background: var(--card-bg);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-stats {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
}

/* Responsive Media Queries */
@media (max-width: 820px) {
  .hero-section {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

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

  .social-links {
    justify-content: center;
  }

  .pub-item {
    grid-template-columns: 1fr;
  }

  .pub-thumb-box {
    height: 180px;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .news-date {
    width: fit-content;
  }
}

@media (max-width: 600px) {
  .nav-links {
    display: none;
    /* Can be expanded to mobile dropdown if needed */
  }

  .name-heading {
    font-size: 1.8rem;
  }
}