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

/* Variables */
:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --text-color: #333;
  --background-color: #f5f6fa;
  --card-background: #ffffff;
  --section-background: #f8f9fa;
  --transition-speed: 0.3s;
  --border-radius: 8px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Base Styles */
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
}

/* Header and Navigation */
.header-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--card-background);
  box-shadow: var(--shadow);
  z-index: 1000;
  padding: 1rem 0;
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  gap: 2rem;
}

nav a {
  text-decoration: none;
  color: var(--primary-color);
  font-weight: 500;
  transition: color var(--transition-speed);
  font-size: 1.1rem;
}

nav a:hover {
  color: var(--secondary-color);
}

/* Main Content */
main {
  margin-top: 4rem;
  padding: 2rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 4rem;
}

/* About Section */
.about-section {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.about-content {
  display: flex;
  gap: 4rem;
  align-items: start;
}

.profile {
  flex: 1;
  text-align: center;
}

.profile-image {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.profile h1 {
  color: var(--primary-color);
  margin-bottom: 0.75rem;
  font-size: 3rem;
  font-weight: 700;
}

.title {
  color: var(--secondary-color);
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.contact-info {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.contact-info a {
  text-decoration: none;
  color: var(--primary-color);
  transition: all var(--transition-speed);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.contact-info a:hover {
  color: var(--secondary-color);
  transform: translateY(-2px);
}

.contact-info i {
  font-size: 1.2rem;
}

.bio {
  flex: 2;
  padding: 2rem;
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-top: 2rem;
}

.bio h2 {
  color: var(--primary-color);
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  text-align: center;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--secondary-color);
  font-weight: 700;
}

.bio p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-color);
  margin-bottom: 1.5rem;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-links a {
  color: var(--primary-color);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border: 1px solid var(--primary-color);
  border-radius: var(--border-radius);
  transition: all var(--transition-speed);
}

.social-links a:hover {
  background-color: var(--primary-color);
  color: white;
}

.social-links i {
  margin-right: 0.5rem;
}

/* Resume Section */
.resume-content {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  width: 100%;
}

.resume-header {
  text-align: right;
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--background-color);
}

.download-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  background-color: var(--secondary-color);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-speed);
  font-weight: 500;
}

.download-button:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
}

.resume-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.experience-section,
.skills-section,
.honors-section {
  background-color: var(--section-background);
  padding: 2rem;
  border-radius: var(--border-radius);
  position: relative;
  margin-bottom: 3rem;
  width: 100%;
  box-sizing: border-box;
}

.experience-section h3,
.skills-section h3,
.honors-section h3 {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin: -2rem 0 1.5rem 0;
  padding: 2rem 0 0.5rem 0;
  border-bottom: 2px solid var(--secondary-color);
  width: 100%;
  font-weight: 700;
  text-align: left;
}

.experience-section h3 i,
.skills-section h3 i,
.honors-section h3 i {
  margin-right: 0.75rem;
  color: var(--secondary-color);
}

.timeline,
.skills-grid,
.honors-container {
  width: 100%;
  display: grid;
  gap: 2rem;
  box-sizing: border-box;
}

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

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.skills-grid,
.honors-container {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.timeline-item,
.skill-category,
.honor-item {
  background-color: var(--card-background);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  transition: transform var(--transition-speed);
}

.timeline-item:hover,
.skill-category:hover,
.honor-item:hover {
  transform: translateY(-2px);
}

.timeline-item h4,
.skill-category h4,
.honor-item h4 {
  color: var(--primary-color);
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.company,
.honor-date {
  color: var(--secondary-color);
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.duration {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  font-style: italic;
}

.timeline-item ul,
.skill-category ul,
.honor-item ul {
  list-style: none;
  padding-left: 0;
}

.timeline-item li,
.skill-category li,
.honor-item li {
  margin-bottom: 0.75rem;
  color: #666;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.6;
}

.timeline-item li::before,
.skill-category li::before,
.honor-item li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--secondary-color);
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: #666;
  margin-top: 4rem;
}

/* Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s, transform 0.6s;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
  .about-content {
    flex-direction: column;
    text-align: center;
    gap: 2rem;
  }

  .profile-image {
    width: 250px;
    height: 250px;
  }

  .profile h1 {
    font-size: 2.5rem;
  }

  .contact-info {
    justify-content: center;
  }

  .skills-grid,
  .honors-container {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    padding: 1.25rem;
  }

  nav ul {
    gap: 1rem;
  }

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

/* Projects Section */
.projects-section {
  padding: 2rem 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.project-card {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  transition: transform var(--transition-speed),
    box-shadow var(--transition-speed);
  cursor: pointer;
  text-decoration: none;
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.project-card h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  background-color: var(--section-background);
  color: var(--secondary-color);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.9rem;
}

.project-card p {
  margin-bottom: 1.5rem;
  color: #666;
  line-height: 1.5;
  flex-grow: 1;
}

.project-links {
  display: flex;
  gap: 1rem;
  margin-top: auto;
}

.project-links .button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--secondary-color);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: background-color var(--transition-speed);
  font-size: 0.9rem;
}

.project-links .button:hover {
  background-color: #2980b9;
}

/* Project Detail Page */
.project-detail {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  margin-bottom: 4rem;
}

.project-detail .back-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-color);
  text-decoration: none;
  margin-bottom: 2rem;
  font-weight: 500;
}

.project-detail h2 {
  color: var(--primary-color);
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.project-detail .project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.project-detail .project-meta .tag {
  background-color: var(--section-background);
  color: var(--secondary-color);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

.project-detail .project-images {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin: 2rem 0;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.project-detail .featured-image {
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  background-color: white;
  padding: 1rem;
}

.project-detail .image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 1rem;
}

.project-detail .image-grid img {
  width: 100%;
  height: 250px;
  object-fit: contain;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
  background-color: white;
  padding: 1rem;
}

.project-detail .image-grid img:hover {
  transform: scale(1.02);
}

.project-content {
  background-color: white;
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-top: 2rem;
  margin-bottom: 3rem;
}

.project-content h3 {
  color: var(--primary-color);
  margin: 2rem 0 1rem;
  font-size: 1.5rem;
}

.project-content h3:first-child {
  margin-top: 0;
}

.project-content p {
  margin-bottom: 1.5rem;
  line-height: 1.6;
  color: var(--text-color);
}

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

.project-section {
  margin: 2rem 0;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.project-section h2 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
}

.project-section p {
  margin-bottom: 1.5rem;
  line-height: 1.6;
  color: var(--text-color);
}

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

@media (max-width: 768px) {
  .project-detail {
    padding: 1rem;
  }

  .project-detail h2 {
    font-size: 2rem;
  }

  .project-detail .project-content {
    padding: 1.5rem;
  }

  .project-detail .project-content h3 {
    font-size: 1.5rem;
  }

  .project-detail .project-content p,
  .project-detail .project-content ul li {
    font-size: 1rem;
  }
}

/* Papers Section */
.papers-section {
  padding: 2rem 0;
}

.papers-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.paper-card {
  background: #ffffff;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border: 1px solid var(--border-color);
}

.paper-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.paper-card h3 {
  color: var(--text-primary);
  font-size: 1.5rem;
  margin: 0;
  line-height: 1.4;
}

.paper-card .authors {
  color: #3498db;
  font-size: 1rem;
  font-weight: 500;
  margin: 0;
}

.paper-card .paper-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

.paper-card .publication-date {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-style: italic;
  margin: 0;
}

.paper-card .abstract {
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.6;
  margin: 0;
}

.paper-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
}

.paper-card .tag {
  background: #ebf5fb;
  color: #3498db;
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.paper-card .paper-links {
  display: flex;
  gap: 1rem;
  margin-top: auto;
}

.paper-card .button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: #3498db;
  color: white;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background-color 0.3s ease;
}

.paper-card .button:hover {
  background: #2980b9;
}

.paper-card .button i {
  font-size: 1rem;
}

/* Honors and Awards Section */
.honors-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.honor-item {
  background-color: var(--card-background);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

.honor-item:hover {
  transform: translateY(-5px);
}

.honor-item h3 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.honor-date {
  color: var(--secondary-color);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  font-style: italic;
  font-weight: 500;
}

.honor-description {
  color: var(--text-color);
  line-height: 1.6;
  margin: 0;
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .honors-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .honor-item {
    padding: 1.25rem;
  }
}

.section {
  margin-bottom: 4rem;
}

.section h2 {
  color: var(--primary-color);
  margin-bottom: 2rem;
  font-size: 2rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section h2 i {
  margin-right: 0.5rem;
}

.skills-section h3,
.honors-section h3 {
  color: var(--primary-color);
  margin-bottom: 2rem;
  font-size: 1.5rem;
  font-weight: 700;
  text-align: left;
}

.skills-section h3 i,
.honors-section h3 i {
  margin-right: 0.5rem;
}

.skills-section,
.honors-section {
  margin-bottom: 3rem;
}

.honors-section .honor-item h4 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 1.1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--secondary-color);
}

.honors-section .honor-item {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
}

.honors-section .honor-item ul {
  list-style: none;
}

.honors-section .honor-item li {
  margin-bottom: 0.75rem;
  color: #666;
  padding-left: 1.5rem;
  position: relative;
}

.honors-section .honor-item li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--secondary-color);
}

.skills-section {
  margin-top: 3rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.skill-category {
  background-color: var(--card-background);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition-speed);
}

.skill-category:hover {
  transform: translateY(-5px);
}

.skill-category h4 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.skill-category ul {
  list-style: none;
  padding: 0;
}

.skill-category li {
  margin-bottom: 0.5rem;
  color: var(--text-color);
  font-size: 1rem;
  line-height: 1.5;
}

@media (max-width: 768px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

.education-section {
  background-color: var(--section-background);
  padding: 2rem;
  border-radius: var(--border-radius);
  position: relative;
  margin-bottom: 0;
  width: 100%;
  box-sizing: border-box;
}

.education-section h3 {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin: -2rem 0 1.5rem 0;
  padding: 2rem 0 0.5rem 0;
  border-bottom: 2px solid var(--secondary-color);
  width: 100%;
  font-weight: 700;
  text-align: left;
}

.education-section h3 i {
  margin-right: 0.75rem;
  color: var(--secondary-color);
}

.education-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.education-item {
  background-color: var(--card-background);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition-speed);
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

.education-item:hover {
  transform: translateY(-5px);
}

.education-item h4 {
  color: var(--primary-color);
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.education-item .institution {
  color: var(--secondary-color);
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.education-item .duration {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  font-style: italic;
}

.education-item .coursework {
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.education-item ul {
  list-style: none;
  padding-left: 0;
}

.education-item li {
  margin-bottom: 0.75rem;
  color: #666;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.6;
}

.education-item li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--secondary-color);
}

@media (max-width: 768px) {
  .education-container {
    grid-template-columns: 1fr;
  }

  .education-item {
    padding: 1.25rem;
  }
}

.honors-section {
  background-color: var(--section-background);
  padding: 2rem;
  border-radius: var(--border-radius);
  position: relative;
  margin-top: 3rem;
  margin-bottom: 0;
  width: 100%;
  box-sizing: border-box;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 2rem 0;
}

.feature-item {
  padding: 1.25rem;
  background-color: var(--section-background);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--secondary-color);
}

.feature-item h4 {
  color: var(--primary-color);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.feature-item p {
  color: var(--text-color);
  margin: 0;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .feature-item {
    padding: 1rem;
  }

  .feature-item h4 {
    font-size: 1.1rem;
  }
}