:root {
  /* Color Palette */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #64748b;
  --color-accent: #f59e0b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  /* Light Theme Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-shadow-light: rgba(0, 0, 0, 0.05);
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;
  --space-5xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: auto;
  --sidebar-width: 300px;
}

/* Dark Theme */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --color-border-light: #475569;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-light: rgba(0, 0, 0, 0.2);
  }
}

[data-theme="dark"] {
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --color-border-light: #475569;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-shadow-light: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-shadow-light: rgba(0, 0, 0, 0.05);
}

/* Reset and Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Focus Styles */
:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1000;
}

.skip-link:focus {
  top: 6px;
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
}

.theme-toggle:hover {
  background: var(--color-bg-tertiary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.theme-toggle:active {
  transform: translateY(0);
}

.theme-icon {
  stroke: var(--color-text-primary);
  stroke-width: 2;
  fill: none;
  transition: all var(--transition-fast);
}

.theme-icon--dark {
  display: none;
}

[data-theme="dark"] .theme-icon--light {
  display: none;
}

[data-theme="dark"] .theme-icon--dark {
  display: block;
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--space-lg);
}

@media (min-width: 768px) {
  .container {
    padding: var(--space-2xl);
  }
}

/* Header */
.header {
  margin-bottom: var(--space-4xl);
}

.header__content {
  display: grid;
  gap: var(--space-2xl);
}

@media (min-width: 768px) {
  .header__content {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
}

/* Profile */
.profile {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .profile {
    flex-direction: row;
    align-items: flex-start;
  }
}

.profile__image {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-xl);
  object-fit: cover;
  border: 3px solid var(--color-border);
  transition: all var(--transition-normal);
  flex-shrink: 0;
}

.profile__image:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.profile__info {
  flex: 1;
}

.profile__name {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.profile__role {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.profile__tldr {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

/* Contact */
.contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-self: start;
}

@media (min-width: 768px) {
  .contact {
    background: var(--color-bg-secondary);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
  }
}

.contact__item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.contact__icon {
  stroke: var(--color-primary);
  stroke-width: 2;
  fill: none;
  flex-shrink: 0;
}

.contact__link {
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.contact__link:hover {
  color: var(--color-primary);
}

.contact__text {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

/* Social Links */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

@media (min-width: 768px) {
  .social-links {
    flex-direction: column;
    margin-top: 0;
  }
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  padding: var(--space-sm);
  border-radius: var(--radius-md);
}

.social-link:hover {
  color: var(--color-primary);
  background: var(--color-bg-tertiary);
  transform: translateX(4px);
}

.social-link__icon {
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  flex-shrink: 0;
}

.social-link__text {
  font-size: var(--font-size-sm);
}

/* Main Content */
.main {
  display: flex;
  flex-direction: column;
  gap: var(--space-4xl);
}

/* Sections */
.section {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.section__title {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-xl);
  color: var(--color-text-primary);
}

.section__icon {
  stroke: var(--color-primary);
  stroke-width: 2;
  fill: none;
  flex-shrink: 0;
}

.section__content {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.section__content p {
  margin-bottom: var(--space-lg);
}

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

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--space-2xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline__item {
  position: relative;
  margin-bottom: var(--space-3xl);
}

.timeline__item:last-child {
  margin-bottom: 0;
}

.timeline__marker {
  position: absolute;
  left: -var(--space-2xl);
  top: var(--space-sm);
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  border: 3px solid var(--color-bg-secondary);
  box-shadow: 0 0 0 3px var(--color-border);
}

.timeline__content {
  background: var(--color-bg-primary);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.timeline__content:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.timeline__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

@media (min-width: 640px) {
  .timeline__header {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.timeline__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.timeline__period {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background: var(--color-bg-tertiary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.timeline__company {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.timeline__description {
  line-height: var(--line-height-relaxed);
}

/* Skills Grid */
.skills-grid {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.skill-group {
  background: var(--color-bg-primary);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.skill-group:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.skill-group__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.skill-group__title::before {
  content: '';
  width: 4px;
  height: 20px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
}

.skill-group__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.skill-item {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.skill-item:hover {
  background: var(--color-primary);
  color: white;
  transform: translateX(4px);
}

/* Education List */
.education-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.education-item {
  display: flex;
  gap: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.education-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.education-item__year {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  background: var(--color-bg-tertiary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  height: fit-content;
  white-space: nowrap;
  flex-shrink: 0;
}

.education-item__content {
  flex: 1;
}

.education-item__degree {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.education-item__institution {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

/* Publications List */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.publication-item {
  display: flex;
  gap: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.publication-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.publication-item__year {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  background: var(--color-bg-tertiary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  height: fit-content;
  white-space: nowrap;
  flex-shrink: 0;
}

.publication-item__content {
  flex: 1;
}

.publication-item__title {
  margin-bottom: var(--space-sm);
}

.publication-item__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  transition: color var(--transition-fast);
}

.publication-item__link:hover {
  color: var(--color-primary);
}

.external-link-icon {
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  flex-shrink: 0;
}

.publication-item__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Print Styles */
@media print {
  :root {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f8f9fa;
    --color-text-primary: #000000;
    --color-text-secondary: #333333;
    --color-text-muted: #666666;
    --color-border: #dddddd;
    --color-border-light: #eeeeee;
    --color-shadow: transparent;
    --color-shadow-light: transparent;
  }
  
  * {
    -webkit-print-color-adjust: exact;
    color-adjust: exact;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  .theme-toggle {
    display: none !important;
  }
  
  .container {
    max-width: none;
    margin: 0;
    padding: 0;
  }
  
  .header {
    margin-bottom: 1.5rem;
  }
  
  .header__content {
    display: block;
  }
  
  .profile {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
  }
  
  .profile__image {
    width: 80px;
    height: 80px;
    border: 2px solid #ddd;
  }
  
  .profile__name {
    font-size: 24pt;
    color: #000 !important;
    background: none !important;
    -webkit-background-clip: unset !important;
    -webkit-text-fill-color: unset !important;
  }
  
  .profile__role {
    font-size: 14pt;
  }
  
  .profile__tldr {
    font-size: 11pt;
  }
  
  .contact {
    background: none !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    margin-bottom: 1rem;
  }
  
  .social-links {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
  }
  
  .social-link {
    font-size: 10pt;
    padding: 0;
  }
  
  .main {
    gap: 1.5rem;
  }
  
  .section {
    background: none !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
    padding: 1rem !important;
    page-break-inside: avoid;
    break-inside: avoid;
  }
  
  .section:hover {
    transform: none !important;
  }
  
  .section__title {
    font-size: 16pt;
    margin-bottom: 0.75rem;
    border-bottom: 2px solid #ddd;
    padding-bottom: 0.25rem;
  }
  
  .timeline {
    padding-left: 0;
  }
  
  .timeline::before {
    display: none;
  }
  
  .timeline__item {
    margin-bottom: 1rem;
    page-break-inside: avoid;
    break-inside: avoid;
  }
  
  .timeline__marker {
    display: none;
  }
  
  .timeline__content {
    background: none !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
    padding: 0.75rem !important;
  }
  
  .timeline__content:hover {
    transform: none !important;
  }
  
  .timeline__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
  }
  
  .timeline__title {
    font-size: 12pt;
  }
  
  .timeline__period {
    background: #f0f0f0 !important;
    font-size: 10pt;
  }
  
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .skill-group {
    background: none !important;
    border: 1px solid #ddd !important;
    padding: 0.75rem !important;
    page-break-inside: avoid;
    break-inside: avoid;
  }
  
  .skill-group:hover {
    transform: none !important;
  }
  
  .skill-group__title {
    font-size: 12pt;
    margin-bottom: 0.5rem;
  }
  
  .skill-item {
    background: #f8f9fa !important;
    font-size: 10pt;
    padding: 0.25rem 0.5rem !important;
  }
  
  .skill-item:hover {
    transform: none !important;
    background: #f8f9fa !important;
    color: inherit !important;
  }
  
  .education-list,
  .publications-list {
    gap: 0.75rem;
  }
  
  .education-item,
  .publication-item {
    background: none !important;
    border: 1px solid #ddd !important;
    padding: 0.75rem !important;
    page-break-inside: avoid;
    break-inside: avoid;
  }
  
  .education-item:hover,
  .publication-item:hover {
    transform: none !important;
  }
  
  .education-item__year,
  .publication-item__year {
    background: #f0f0f0 !important;
    font-size: 10pt;
  }
  
  .education-item__degree,
  .publication-item__title {
    font-size: 11pt;
  }
  
  .publication-item__link {
    font-size: 11pt;
  }
  
  .external-link-icon {
    display: none;
  }
  
  /* Ensure proper page breaks */
  h1, h2, h3 {
    page-break-after: avoid;
    break-after: avoid;
  }
  
  .section {
    page-break-before: auto;
    break-before: auto;
  }
  
  /* Hide decorative elements */
  .section__icon,
  .contact__icon,
  .social-link__icon {
    display: none;
  }
}

/* Responsive Design */
@media (max-width: 767px) {
  .container {
    padding: var(--space-md);
  }
  
  .profile {
    text-align: center;
  }
  
  .profile__name {
    font-size: var(--font-size-3xl);
  }
  
  .contact {
    background: none;
    padding: 0;
    border: none;
    box-shadow: none;
  }
  
  .social-links {
    justify-content: center;
  }
  
  .section {
    padding: var(--space-lg);
  }
  
  .section__title {
    font-size: var(--font-size-xl);
  }
  
  .timeline {
    padding-left: var(--space-lg);
  }
  
  .timeline__marker {
    left: -var(--space-lg);
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .education-item,
  .publication-item {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .education-item__year,
  .publication-item__year {
    align-self: flex-start;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
    --color-text-secondary: #000000;
  }
  
  [data-theme="dark"] {
    --color-border: #ffffff;
    --color-text-secondary: #ffffff;
  }
}

/* Animation for smooth theme transitions */
* {
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}