:root {
  /* Light mode colors */
  --navy: #1a365d;
  --gold: #f59e0b;
  --coral: #e53e3e;
  --plum: #6b5b95;
  --plum-accent: #8b7bb8;
  --light-bg: #f8fafc;
  --medium-gray: #6b7280;
  --dark-gray: #4b5563;
  --charcoal: #1f2937;
  --white: #ffffff;
  
  /* Section backgrounds */
  --research-bg: #faf9fb;
  --coral-section-bg: #fffbfb;
  --gold-section-bg: #fffbf5;
  
  /* Typography */
  --font-primary: 'Manrope', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --space-xs: 8px;
  --space-sm: 15px;
  --space-md: 25px;
  --space-lg: 35px;
  --space-xl: 50px;
  --space-xxl: 60px;
}

/* Dark mode colors */
[data-theme="dark"] {
  --navy: #9db2ff;
  --gold: #e6b85c;
  --coral: #ff9f9f;
  --plum: #a78bfa;
  --plum-accent: #c4b5fd;
  --light-bg: #0f172a;
  --medium-gray: #94a3b8;
  --dark-gray: #cbd5e1;
  --charcoal: #f1f5f9;
  --white: #1e293b;
  
  /* Section backgrounds */
  --research-bg: #1e293b;
  --coral-section-bg: #1e293b;
  --gold-section-bg: #1e293b;
}

/* Respect system preference by default */
@media (prefers-color-scheme: dark) {
  :root {
    --navy: #9db2ff;
    --gold: #e6b85c;
    --coral: #ff9f9f;
    --plum: #a78bfa;
    --plum-accent: #c4b5fd;
    --light-bg: #0f172a;
    --medium-gray: #94a3b8;
    --dark-gray: #cbd5e1;
    --charcoal: #f1f5f9;
    --white: #1e293b;
    
    /* Section backgrounds */
    --research-bg: #1e293b;
    --coral-section-bg: #1e293b;
    --gold-section-bg: #1e293b;
  }
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--light-bg);
  color: var(--charcoal);
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-xxl);
  background-color: var(--white);
  min-height: 100vh;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Navigation */
nav {
  margin-bottom: var(--space-md);
  border-bottom: 1px solid #e5e7eb;
  padding-bottom: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--dark-gray);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.nav-links a:hover {
  color: var(--navy);
  background-color: var(--light-bg);
  transform: translateY(-1px);
}

.nav-links a.active {
  color: var(--navy);
}

.nav-links a.active {
  position: relative;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -26px;
  left: 0;
  width: 100%;
  height: 2px;
}

/* Dark mode toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--medium-gray);
  color: var(--dark-gray);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  font-family: var(--font-primary);
}

.theme-toggle:hover {
  background-color: var(--light-bg);
  border-color: var(--dark-gray);
  transform: translateY(-1px);
}

/* Page title in navbar */
.page-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--medium-gray);
  display: none;
}

/* Mobile burger menu */
.burger-menu {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 4px;
  width: 24px;
  height: 18px;
  position: relative;
  justify-content: space-between;
}

.burger-line {
  width: 20px;
  height: 2px;
  background-color: var(--dark-gray);
  transition: all 0.3s ease;
  position: absolute;
  left: 2px;
}

.burger-line:nth-child(1) {
  top: 2px;
}

.burger-line:nth-child(2) {
  top: 8px;
}

.burger-line:nth-child(3) {
  top: 14px;
}

.burger-menu.active .burger-line:nth-child(1) {
  top: 8px;
  transform: rotate(45deg);
}

.burger-menu.active .burger-line:nth-child(2) {
  opacity: 0;
}

.burger-menu.active .burger-line:nth-child(3) {
  top: 8px;
  transform: rotate(-45deg);
}

/* Header with diamond accent */
header {
  position: relative;
  margin-bottom: var(--space-xl);
}

.diamond-accent {
  display: flex;
  gap: var(--space-xs);
}

.diamond {
  width: 12px;
  height: 12px;
  transform: rotate(45deg);
  cursor: pointer;
  position: relative;
}

.diamond::after {
  content: attr(data-tooltip);
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%) rotate(-45deg);
  transform-origin: center top;
  background-color: var(--charcoal);
  color: var(--white);
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s, visibility 0.15s;
  z-index: 9999;
  pointer-events: none;
}

.diamond:hover::after {
  opacity: 1;
  visibility: visible;
}

/* Page sections */
.page-section {
  display: none;
}

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

/* Profile section (Home page) */
.profile {
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
  margin-bottom: var(--space-xl);
}

.profile-image {
  width: 180px;
  height: 180px;
  border-radius: 12px;
  object-fit: cover;
  flex-shrink: 0;
}

.profile-content h1 {
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.1;
  margin-bottom: var(--space-xs);
}

.tagline {
  font-size: 1rem;
  color: var(--medium-gray);
  margin-bottom: var(--space-sm);
}

.aliases {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--medium-gray);
  margin-bottom: var(--space-md);
}

/* CV section */
.cv-section {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.cv-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.cv-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.cv-button {
  display: inline-block;
  background-color: var(--navy);
  color: var(--white);
  padding: 10px 24px;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
}

.cv-button:hover {
  transform: translateY(-1px);
}

.cv-button.secondary {
  background-color: var(--white);
  color: var(--navy);
  border: 2px solid var(--navy);
}

.cv-button.secondary:hover {
  background-color: var(--medium-gray);
  border-color: var(--dark-gray);
  transform: translateY(-1px);
}

.cv-description {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--medium-gray);
  max-width: 180px;
}

/* Section styling */
section {
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section-divider {
  width: 30px;
  height: 2px;
  margin-bottom: var(--space-md);
}

/* Content text styling */
.content-text {
  font-size: 0.9rem;
  color: var(--dark-gray);
  max-width: 600px;
}

.content-text p {
  margin-bottom: var(--space-sm);
}

.content-text a,
.project-description a,
.publication-links a,
.presentation-links a,
.achievement-description a {
  color: var(--navy);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}

.content-text a:hover,
.project-description a:hover,
.publication-links a:hover,
.presentation-links a:hover,
.achievement-description a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

/* Research/Leadership focus sections */
.research-focus,
.leadership-focus {
  background-color: var(--light-bg);
  padding: var(--space-md);
  border-radius: 8px;
  margin-bottom: var(--space-md);
}

.research-focus h3,
.leadership-focus h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: var(--space-sm);
}

.research-areas,
.leadership-areas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.research-tag,
.leadership-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--dark-gray);
  background-color: var(--white);
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid #e5e7eb;
}

/* Projects */
.project-item {
  margin-bottom: var(--space-xl);
}

.project-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: var(--space-sm);
}

.project-description {
  font-size: 0.9rem;
  color: var(--dark-gray);
  margin-bottom: var(--space-sm);
}

.project-tech {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--medium-gray);
  margin-top: var(--space-sm);
}

.project-links {
  display: flex;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-top: var(--space-xs);
}

/* Experience/Leadership items */
.experience-item,
.leadership-item {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid #e5e7eb;
}

.experience-item:last-child,
.leadership-item:last-child {
  border-bottom: none;
}

.experience-header,
.leadership-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-sm);
}

.job-title,
.role-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--navy);
}

.duration {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--medium-gray);
}

.company,
.organization {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--navy);
  margin-bottom: var(--space-sm);
}

.metrics {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--medium-gray);
  margin-top: var(--space-sm);
  font-style: italic;
}

/* Impact grid */
.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.impact-card {
  text-align: center;
  padding: var(--space-md);
  background-color: var(--light-bg);
  border-radius: 8px;
}

.impact-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--space-xs);
}

.impact-label {
  font-size: 0.8rem;
  color: var(--medium-gray);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Service categories */
.service-category {
  margin-bottom: var(--space-lg);
}

.service-category h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: var(--space-sm);
}

.service-list {
  list-style: none;
  padding: 0;
}

.service-list li {
  font-size: 0.9rem;
  color: var(--dark-gray);
  margin-bottom: var(--space-xs);
  padding-left: var(--space-sm);
  position: relative;
}

.service-list li::before {
  content: '•';
  position: absolute;
  left: 0;
}

/* Contact section */
.contact {
  border-top: 1px solid #e5e7eb;
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.contact-links {
  display: flex;
  gap: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.contact-links a {
  color: var(--dark-gray);
  text-decoration: none;
  font-weight: 500;
}

.contact-links a:hover {
  text-decoration: underline;
}

/* Footer diamond accent */
.footer-diamonds {
  display: flex;
  gap: var(--space-xs);
  margin-left: auto;
}

.footer-diamonds .diamond {
  width: 10px;
  height: 10px;
  cursor: default;
}

.footer-diamonds .diamond:nth-child(1) {
  background-color: var(--plum);
}

.footer-diamonds .diamond:nth-child(2) {
  background-color: var(--gold);
}

.footer-diamonds .diamond:nth-child(3) {
  background-color: var(--coral);
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: var(--space-lg) var(--space-md);
    margin: 0;
  }

  /* Navigation improvements */
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    flex-direction: column;
    padding: var(--space-md);
    gap: 4px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    margin-top: 8px;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    border: none;
  }
  
  .nav-links a:hover {
    background-color: var(--light-bg);
    transform: none;
  }
  
  .nav-links a.active {
    background-color: var(--navy);
    color: var(--white);
  }
  
  .nav-links a.active::after {
    display: none;
  }

  nav {
    position: relative;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
  }
  
  .nav-left {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
  }
  
  .burger-menu {
    display: flex;
  }
  
  .page-title {
    display: block;
  }
  
  .theme-toggle {
    font-size: 0.75rem;
    padding: 4px 8px;
  }
  
  .diamond-accent {
    gap: 4px;
    align-items: center;
  }
  
  .diamond {
    width: 12px;
    height: 12px;
  }
  }

  /* Profile section */
  .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-md);
  }

  .profile-image {
    width: 140px;
    height: 140px;
  }

  .profile-content h1 {
    font-size: 2rem;
  }

  .tagline {
    font-size: 0.95rem;
  }

  .aliases {
    font-size: 0.75rem;
    text-align: center;
  }

  /* CV buttons */
  .cv-buttons {
    flex-direction: column;
    gap: var(--space-sm);
    align-items: center;
  }

  .cv-option {
    width: 100%;
    max-width: 280px;
  }

  .cv-button {
    width: 100%;
    text-align: center;
    padding: 12px 20px;
  }

  /* Research/Leadership areas */
  .research-areas,
  .leadership-areas {
    gap: var(--space-xs);
  }

  .research-tag,
  .leadership-tag {
    font-size: 0.75rem;
    padding: 3px 8px;
  }

  /* Experience/Leadership headers */
  .experience-header,
  .leadership-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }

  .duration {
    font-size: 0.75rem;
  }

  /* Impact grid */
  .impact-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .impact-number {
    font-size: 1.5rem;
  }

  .impact-label {
    font-size: 0.75rem;
  }

  /* Project and achievement items */
  .project-item,
  .achievement-item {
    margin-bottom: var(--space-lg);
  }

  .project-tech {
    font-size: 0.75rem;
    line-height: 1.6;
  }

  .project-links {
    flex-wrap: wrap;
    gap: var(--space-xs);
  }

  /* Lists and content */
  .service-list li,
  .philosophy-list li {
    font-size: 0.85rem;
    margin-bottom: var(--space-sm);
  }

  .content-text {
    font-size: 0.85rem;
  }

  .content-text p {
    margin-bottom: var(--space-sm);
  }

  /* Contact section */
  .contact {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-xs);
  }

  .contact-links {
    flex-wrap: nowrap;
    gap: var(--space-sm);
    font-size: 0.7rem;
  }

  .footer-diamonds {
    margin-left: 0;
    margin-top: 0;
  }

  /* Metrics text */
  .metrics {
    font-size: 0.75rem;
    line-height: 1.6;
  }
}

/* Extra small screens */
@media (max-width: 480px) {
  .container {
    padding: var(--space-md) var(--space-sm);
  }

  .profile-content h1 {
    font-size: 1.8rem;
  }

  .nav-links {
    justify-content: center;
    width: 100%;
  }

  .impact-grid {
    grid-template-columns: 1fr;
  }

  .cv-buttons {
    gap: var(--space-xs);
  }

  .aliases {
    font-size: 0.7rem;
    line-height: 1.4;
  }
}