/* ===================================
   RESET & BASE STYLES
   =================================== */

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

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --accent-color: #f59e0b;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --background: #ffffff;
  --surface: #f9fafb;
  --border: #e5e7eb;
  --highlight: #fef3c7;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Lora', Georgia, serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   TYPOGRAPHY
   =================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.intro-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

/* ===================================
   LINKS
   =================================== */

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease, transform 0.2s ease;
  display: inline-block;
}

a:hover,
a:focus {
  color: var(--accent-color);
}

/* ===================================
   SPLASH SCREEN
   =================================== */

.splash-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease;
}

.splash-content {
  text-align: center;
  color: white;
}

.splash-name {
  font-family: 'Poppins', sans-serif;
  font-size: 4.5rem;
  font-weight: 800;
  margin: 0 0 1.5rem 0;
  opacity: 0;
  animation: fadeInDown 0.8s ease forwards;
  animation-delay: 0.3s;
}

.splash-position {
  font-family: 'Poppins', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 1.5rem 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.6s;
}

.splash-position .position-item {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 0.875rem;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  font-weight: 600;
  color: white;
  backdrop-filter: blur(10px);
}

.splash-position .position-separator {
  color: rgba(255, 255, 255, 0.7);
  font-weight: 300;
}

.splash-focus {
  font-family: 'Poppins', sans-serif;
  font-size: 1.05rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.95);
  margin: 1.5rem 0 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.9s;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.rotating-name {
  font-family: 'Poppins', sans-serif;
  font-size: 6rem;
  font-weight: 700;
  margin: 0;
  perspective: 1000px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.name-line {
  display: inline-block;
  opacity: 0;
  transform: rotateX(-90deg);
  animation: rotateIn 1.2s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.name-line:first-child {
  animation-delay: 0.2s;
}

.name-line:last-child {
  animation-delay: 0.5s;
}

@keyframes rotateIn {
  0% {
    opacity: 0;
    transform: rotateX(-90deg) translateY(-50px);
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    transform: rotateX(0deg) translateY(0);
  }
}

.splash-subtitle {
  font-family: 'Poppins', sans-serif;
  font-size: 1.25rem;
  font-weight: 400;
  margin-top: 2rem;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 1s;
  letter-spacing: 0.05em;
}

.scroll-indicator {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 1.5s;
}

.scroll-indicator span {
  font-family: 'Poppins', sans-serif;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.5rem;
}

.scroll-arrow {
  font-size: 2rem;
  animation: bounce 2s infinite;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

/* ===================================
   MAIN CONTAINER
   =================================== */

.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

/* ===================================
   HERO SECTION
   =================================== */

.hero-section {
  margin-bottom: 6rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.hero-section.visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 4rem;
  align-items: start;
}

.highlight-text {
  background: linear-gradient(135deg, var(--accent-color) 0%, #f97316 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.hero-text p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.personal-note {
  font-style: italic;
  color: var(--text-secondary);
}

.social-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.social-link {
  font-family: 'Poppins', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 1.25rem;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 8px;
  transition: all 0.3s ease;
}

.social-link:hover {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ===================================
   HERO IMAGE
   =================================== */

.hero-image {
  position: sticky;
  top: 2rem;
}

.image-wrapper {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-wrapper:hover {
  transform: scale(1.05);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.profile-photo {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.3s ease;
}

/* ===================================
   RESEARCH SECTION
   =================================== */

.research-section {
  margin-bottom: 6rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.research-section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 800px;
}

.highlight {
  background-color: var(--highlight);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
}

/* ===================================
   CITATION METRICS
   =================================== */

.citation-metrics-section {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem;
  margin-bottom: 4rem;
  align-items: center;
}

.citation-chart-wrapper {
  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.citation-chart-wrapper canvas {
  max-width: 100%;
  height: auto;
}

.citation-stats {
  display: grid;
  gap: 1.5rem;
}

.metrics-card {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 2px solid var(--primary-color);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.metrics-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.metric-value {
  font-family: 'Poppins', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.metric-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===================================
   PAPERS GRID
   =================================== */

.papers-grid {
  display: grid;
  gap: 2rem;
}

.paper-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

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

.paper-card.featured {
  background: linear-gradient(135deg, #fef3c7 0%, #fef9e7 100%);
  border-color: var(--accent-color);
  border-width: 2px;
}

.paper-card.featured::before {
  content: "Featured";
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--accent-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-family: 'Poppins', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.paper-card.under-review {
  background: rgba(107, 114, 128, 0.05);
  border-color: var(--text-secondary);
  opacity: 0.9;
}

.paper-card.under-review::before {
  content: "Under Review";
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--text-secondary);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-family: 'Poppins', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.paper-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.paper-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.paper-title a:hover {
  color: var(--primary-color);
}

.paper-authors {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.paper-authors strong {
  color: var(--text-primary);
  font-weight: 600;
}

.paper-venue {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-style: italic;
}

.paper-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.paper-link {
  font-family: 'Poppins', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.375rem 1rem;
  background: var(--primary-color);
  color: white;
  border-radius: 6px;
  transition: all 0.3s ease;
  text-transform: lowercase;
}

.paper-link:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  color: white;
}

/* ===================================
   FOOTER
   =================================== */

.site-footer {
  text-align: center;
  padding: 3rem 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
  margin-top: 6rem;
}

.site-footer a {
  color: var(--text-secondary);
}

.site-footer a:hover {
  color: var(--primary-color);
}

/* ===================================
   FADE IN ANIMATIONS
   =================================== */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media screen and (max-width: 1024px) {
  .rotating-name {
    font-size: 4.5rem;
  }

  .hero-content {
    grid-template-columns: 1fr 250px;
    gap: 3rem;
  }

  .section-title {
    font-size: 2rem;
  }
}

@media screen and (max-width: 768px) {
  .rotating-name {
    font-size: 3.5rem;
  }

  .splash-subtitle {
    font-size: 1rem;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-image {
    position: static;
    max-width: 300px;
    margin: 0 auto;
  }

  .splash-name {
    font-size: 3rem;
  }

  .splash-position {
    flex-direction: column;
    gap: 0.75rem;
  }

  .splash-position .position-separator {
    display: none;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .main-container {
    padding: 2rem 1.5rem;
  }

  .citation-metrics-section {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .paper-card {
    padding: 1.5rem;
  }

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

@media screen and (max-width: 480px) {
  .rotating-name {
    font-size: 2.5rem;
  }

  .splash-name {
    font-size: 2.25rem;
  }

  .splash-position {
    font-size: 0.95rem;
  }

  .splash-focus {
    font-size: 0.95rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .hero-text p,
  .section-description {
    font-size: 0.95rem;
  }

  .paper-card {
    padding: 1.25rem;
  }

  .paper-title {
    font-size: 1rem;
  }

  .paper-card.featured::before {
    top: 0.75rem;
    right: 0.75rem;
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
  }
}

/* ===================================
   ACCESSIBILITY
   =================================== */

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

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ===================================
   PRINT STYLES
   =================================== */

@media print {
  .splash-screen {
    display: none;
  }

  .scroll-indicator {
    display: none;
  }

  body {
    background: white;
  }

  .paper-card {
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }

  a {
    text-decoration: underline;
  }

  .social-link {
    border: 1px solid #ccc;
  }
}