/* ──────────────────────────────────────────────────────────────
   style.css
────────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@300;400;500;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* ──────────────────────────────────────────────────────────────
   1. CSS Variables & Reset
────────────────────────────────────────────────────────────── */
:root {
  --primary-blue: #1976d2;
  --secondary-blue: #1565c0;
  --dark-blue: #0d47a1;
  --light-blue: #42a5f5;
  --accent-blue: #2196f3;
  --bg-light: #f8faff;
  --bg-gradient: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 50%, #90caf9 100%);
  --text-dark: #1a237e;
  --text-medium: #3949ab;
  --text-light: #5c6bc0;
  --white: #ffffff;
  --shadow-light: 0 2px 10px rgba(25, 118, 210, 0.1);
  --shadow-medium: 0 4px 20px rgba(25, 118, 210, 0.15);
  --shadow-heavy: 0 8px 30px rgba(25, 118, 210, 0.2);
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

:root {
    --bg-color: #0a0a0a;
    --text-color: #e2e2e2;
    --panel-bg: rgba(15, 15, 15, 0.88);
    --panel-border: rgba(90, 90, 90, 0.25);
    --node-panel-bg: rgba(20, 20, 20, 0.95);
    --node-panel-border: rgba(120, 120, 120, 0.35);
    --close-btn-color: #ff4d4d;

    --gradient-start: #7f7f7f;
    --gradient-end: #b3b3b3;

    --theme-toggle-bg: rgba(255, 255, 255, 0.06);
    --theme-toggle-border: rgba(255, 255, 255, 0.2);

    --hint-opacity: 0.5;
    --content-opacity: 0.85;
}

nodeMaterials emissiveIntensity: 0.18;

#canvas {
    filter: contrast(1) brightness(0.9) saturate(0.9);
}


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

/* ──────────────────────────────────────────────────────────────
   2. Base / Body
────────────────────────────────────────────────────────────── */
body {
  font-family: 'Roboto Mono', monospace;
  margin: 0;
  background: var(--bg-gradient);
  background-attachment: fixed;
  padding: 20px;
  padding-top: 80px;
  color: var(--text-dark);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ──────────────────────────────────────────────────────────────
   3. Enhanced Navigation Bar
────────────────────────────────────────────────────────────── */
nav {
 position: fixed;
 top: 0;
 left: 0;
 width: 100%;
 background: rgba(255, 255, 255, 0.8);
 backdrop-filter: blur(25px);
 padding: 12px 0;
 box-shadow: var(--shadow-medium);
 z-index: 1000;
 border-bottom: 1px solid rgba(25, 118, 210, 0.1);
}

nav ul {
 list-style: none;
 padding: 0;
 margin: 0;
 display: flex;
 justify-content: center;
 align-items: center;
 gap: clamp(20px, 4vw, 35px);
 flex-wrap: wrap;
 max-width: 1200px;
 margin: 0 auto;
 padding: 0 20px;
}

nav ul li a {
 text-decoration: none;
 color: var(--text-dark);
 font-weight: 500;
 font-size: 0.95rem;
 padding: 10px 18px;
 border-radius: 10px;
 transition: var(--transition);
 position: relative;
 display: block;
 white-space: nowrap;
}

nav ul li a:hover {
 background: var(--primary-blue);
 color: var(--white);
 transform: translateY(-2px);
 box-shadow: var(--shadow-light);
}

nav ul li a:focus-visible {
 outline: 2px solid var(--accent-blue);
 outline-offset: 2px;
}

@media (max-width: 768px) {
 nav {
   padding: 10px 0;
 }
 
 nav ul {
   gap: 15px;
   padding: 0 15px;
 }
 
 nav ul li a {
   font-size: 0.9rem;
   padding: 8px 14px;
 }
}

@media (max-width: 480px) {
 nav ul {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
   gap: 8px;
   text-align: center;
 }
}

/* ──────────────────────────────────────────────────────────────
   4. Enhanced Particles Background
────────────────────────────────────────────────────────────── */
#particles-js {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: var(--bg-gradient);
}

.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.particle {
  position: absolute;
  border-radius: 50%;
  animation: float 25s infinite linear;
}

.particle:nth-child(odd) {
  width: 4px;
  height: 4px;
  background: rgba(25, 118, 210, 0.3);
}

.particle:nth-child(even) {
  width: 2px;
  height: 2px;
  background: rgba(33, 150, 243, 0.4);
}

@keyframes float {
  0% {
    transform: translateY(100vh) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100vh) rotate(360deg);
    opacity: 0;
  }
}

/* ──────────────────────────────────────────────────────────────
   5. Enhanced Main Content & Hero Section
────────────────────────────────────────────────────────────── */
main {
  max-width: 700px;
  margin: 120px auto 40px;
  text-align: center;
  padding: 0 20px;
  position: relative;
  z-index: 10;
}

main h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--dark-blue), var(--primary-blue), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
  animation: slideDown 0.8s ease-out;
}

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

main > p {
  font-size: 1.3rem;
  margin-bottom: 30px;
  color: var(--text-medium);
  font-weight: 400;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeIn 0.8s ease-out 0.2s both;
}

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

/* ──────────────────────────────────────────────────────────────
   6. Bio Tags
────────────────────────────────────────────────────────────── */
.bio-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 50px;
  animation: fadeIn 0.8s ease-out 0.4s both;
}

.bio-tag {
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  padding: 10px 20px;
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.bio-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition);
}

.bio-tag:hover::before {
  left: 100%;
}

.bio-tag:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-medium);
}

/* ──────────────────────────────────────────────────────────────
   7. Enhanced Interest Cards
────────────────────────────────────────────────────────────── */
.interests-container {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  border-radius: var(--border-radius);
  padding: 40px;
  margin-bottom: 50px;
  box-shadow: var(--shadow-medium);
  border: 1px solid rgba(25, 118, 210, 0.1);
  animation: fadeIn 0.8s ease-out 0.6s both;
}

.interests-title {
  font-size: 2rem;
  color: var(--dark-blue);
  margin-bottom: 35px;
  font-weight: 700;
  position: relative;
}

.interests-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-blue), var(--accent-blue));
  border-radius: 2px;
}

.interest-section {
  margin-bottom: 30px;
  text-align: left;
  padding: 20px;
  border-radius: 10px;
  background: rgba(25, 118, 210, 0.02);
  border-left: 4px solid var(--primary-blue);
  transition: var(--transition);
}

.interest-section:hover {
  background: rgba(25, 118, 210, 0.05);
  transform: translateX(5px);
  box-shadow: var(--shadow-light);
}

.interest-section:last-child {
  margin-bottom: 0;
}

.interest-section h3 {
  color: var(--primary-blue);
  font-size: 1.3rem;
  margin-bottom: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}

.interest-icon {
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.interest-section ul {
  list-style: none;
  padding-left: 0;
}

.interest-section ul li {
  color: var(--text-medium);
  margin-bottom: 8px;
  padding-left: 0;
  position: relative;
  transition: var(--transition);
}

.interest-section ul li::before {
  content: '';
}

.interest-section ul li:hover {
  color: var(--primary-blue);
  transform: translateX(5px);
}

/* ──────────────────────────────────────────────────────────────
   8. Call to Action Section
────────────────────────────────────────────────────────────── */
.cta-section {
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
  color: var(--white);
  padding: 40px;
  border-radius: var(--border-radius);
  text-align: center;
  margin-bottom: 50px;
  box-shadow: var(--shadow-heavy);
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.8s ease-out 0.8s both;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.cta-section h2 {
  font-size: 2rem;
  margin-bottom: 15px;
  font-weight: 600;
  position: relative;
  z-index: 1;
}

.cta-section p {
  font-size: 1.1rem;
  margin-bottom: 25px;
  opacity: 0.9;
  position: relative;
  z-index: 1;
}

.cta-button {
  display: inline-block;
  background: var(--white);
  color: var(--primary-blue);
  padding: 15px 30px;
  text-decoration: none;
  border-radius: 30px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: var(--shadow-light);
  position: relative;
  z-index: 1;
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
  background: rgba(255, 255, 255, 0.95);
}

/* ──────────────────────────────────────────────────────────────
   9. Enhanced Timeline
────────────────────────────────────────────────────────────── */
.timeline {
  max-width: 800px;
  margin: 80px auto 20px;
  padding: 0 20px;
}

.timeline h1 {
  font-size: 2.5rem;
  margin-bottom: 40px;
  color: var(--dark-blue);
  text-align: center;
  font-weight: 700;
}

.timeline-container {
  position: relative;
  padding: 20px 0;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-medium);
  border-radius: var(--border-radius);
}

.timeline-item {
  padding: 20px 30px;
  border-left: 4px solid var(--primary-blue);
  margin: 30px 0;
  position: relative;
  background: rgba(25, 118, 210, 0.02);
  border-radius: 8px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease-out;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 15px;
  width: 20px;
  height: 20px;
  background: var(--primary-blue);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--white);
}

.timeline-item:hover {
  background: rgba(25, 118, 210, 0.05);
  transform: translateX(10px);
  box-shadow: var(--shadow-light);
}

.timeline-content h2 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  color: var(--primary-blue);
  font-weight: 600;
}

.timeline-content p {
  margin: 0;
  color: var(--text-medium);
  line-height: 1.6;
}

/* ──────────────────────────────────────────────────────────────
   10. Enhanced Video Gallery & Research Pages
────────────────────────────────────────────────────────────── */
.video-gallery,
.research-page {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

.video-item {
  margin-bottom: 50px;
  text-align: center;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(15px);
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
  transition: var(--transition);
}

.video-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-heavy);
}

.video-item h2 {
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--primary-blue);
  font-weight: 600;
}

.video-item iframe {
  width: 100%;
  max-width: 560px;
  height: 315px;
  border: none;
  border-radius: 12px;
  box-shadow: var(--shadow-medium);
  transition: var(--transition);
}

.video-item iframe:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-heavy);
}

.research-page h1 {
  font-size: 2.8rem;
  text-align: center;
  margin-bottom: 50px;
  color: var(--dark-blue);
  font-weight: 700;
}

.research-page h2 {
  font-size: 1.8rem;
  margin-bottom: 15px;
  color: var(--primary-blue);
  font-weight: 600;
}

.research-page h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--secondary-blue);
  font-weight: 500;
}

.research-page p {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 15px;
  color: var(--text-medium);
}

.research-page a {
  display: inline-block;
  margin-top: 5px;
  text-decoration: none;
  color: var(--primary-blue);
  font-weight: 500;
  transition: var(--transition);
  border-bottom: 2px solid transparent;
}

.research-page a:hover {
  color: var(--secondary-blue);
  border-bottom-color: var(--secondary-blue);
  transform: translateY(-1px);
}

.summary-item,
.preprint {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(15px);
  padding: 30px;
  margin-bottom: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
  border-left: 4px solid var(--primary-blue);
  transition: var(--transition);
}

.summary-item:hover,
.preprint:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-heavy);
  border-left-color: var(--accent-blue);
}

/* ──────────────────────────────────────────────────────────────
   11. Enhanced Footer
────────────────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 40px 20px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  margin-top: 50px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-medium);
  color: var(--text-medium);
  font-weight: 500;
}

footer p {
  margin: 0;
  font-size: 0.95rem;
}

/* ──────────────────────────────────────────────────────────────
   12. Responsive Design
────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  body {
    padding: 15px;
    padding-top: 70px;
  }
  
  nav {
    padding: 12px 0;
  }
  
  nav ul {
    gap: 15px;
  }
  
  nav ul li a {
    font-size: 0.9rem;
    padding: 6px 12px;
  }
  
  main {
    margin-top: 100px;
  }
  
  main h1 {
    font-size: 2.5rem;
  }
  
  main > p {
    font-size: 1.1rem;
  }
  
  .bio-tags {
    gap: 8px;
  }
  
  .bio-tag {
    padding: 8px 16px;
    font-size: 0.85rem;
  }
  
  .interests-container {
    padding: 25px;
  }
  
  .interests-title {
    font-size: 1.6rem;
  }
  
  .interest-section {
    padding: 15px;
  }
  
  .cta-section {
    padding: 30px 20px;
  }
  
  .cta-section h2 {
    font-size: 1.6rem;
  }
  
  .video-item {
    padding: 20px;
  }
  
  .video-item iframe {
    height: 250px;
  }
}

@media (max-width: 480px) {
  nav ul {
    flex-direction: column;
    gap: 10px;
  }
  
  main h1 {
    font-size: 2rem;
  }
  
  .bio-tags {
    flex-direction: column;
    align-items: center;
  }
  
  .interests-container {
    padding: 20px;
  }
  
  .interest-section {
    padding: 12px;
  }
  
  .video-item iframe {
    height: 200px;
  }
}

/* ──────────────────────────────────────────────────────────────
   13. Accessibility & Utility Classes
────────────────────────────────────────────────────────────── */
.scroll-container {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(15px);
  border-radius: var(--border-radius);
  overflow-x: auto;
  white-space: nowrap;
  padding: 20px;
  box-shadow: var(--shadow-medium);
}

.scroll-container img {
  padding: 10px;
  border-radius: 8px;
  transition: var(--transition);
}

.scroll-container img:hover {
  transform: scale(1.05);
}

/* Focus styles for accessibility */
nav ul li a:focus,
.cta-button:focus {
  outline: 3px solid var(--accent-blue);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  nav,
  .particles,
  #particles-js {
    display: none;
  }
  
  main {
    margin-top: 0;
  }
}