/* Modern font stack */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

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

:root {
  --bg-color: #fff;
  --text-color: #000;
  --text-secondary: #333;
  --text-muted: #666;
  --border-color: #e5e5e5;
  --hover-opacity: 0.6;
  --transition: all 0.3s ease;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Dark Theme */
.dark-theme {
  --bg-color: #000;
  --text-color: #fff;
  --text-secondary: #e0e0e0;
  --text-muted: #999;
  --border-color: #333;
  --hover-opacity: 0.8;
}

.dark-theme body {
  background-color: var(--bg-color);
  color: var(--text-color);
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  padding: 30px 0;
  border-bottom: 1px solid var(--border-color);
  transition: border-color 0.3s ease;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-color);
  font-weight: 600;
  font-size: 18px;
  transition: var(--transition);
}

.logo:hover {
  opacity: var(--hover-opacity);
}

.logo svg {
  transition: transform 0.3s ease;
}

.logo:hover svg {
  transform: rotate(5deg) scale(1.05);
}

.site-header nav {
  display: flex;
  gap: 30px;
  justify-content: flex-start;
  flex: 1;
  margin-left: 20px;
}

.site-header nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition);
  position: relative;
}

.site-header nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--text-color);
  transition: width 0.3s ease;
}

.site-header nav a:hover::after,
.site-header nav a.active::after {
  width: 100%;
}

.site-header nav a:hover {
  opacity: var(--hover-opacity);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--text-color);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  background-color: var(--border-color);
  transform: scale(1.05);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-icon {
  transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-icon {
  transform: rotate(15deg);
}

/* Main content */
main {
  padding: 60px 0;
}

.hero {
  max-width: 700px;
}

.hero-header {
  display: flex;
  align-items: flex-start;
  gap: 30px;
  margin-top: 50px;
}

.avatar-container {
  position: relative;
  flex-shrink: 0;
  margin-bottom:10px;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border-color);
  transition: var(--transition);
  display: block;
}

.avatar-border {
  position: absolute;
  top: -5px;
  left: -5px;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  border: 2px solid var(--text-color);
  opacity: 0;
  transition: var(--transition);
}

.avatar-container:hover .avatar {
  transform: scale(1.05);
  border-color: var(--text-color);
}

.avatar-container:hover .avatar-border {
  opacity: 0.3;
}

.hero-text {
  flex: 1;
}

.name {
  font-size: 48px;
  font-weight: 600;
  margin-bottom: 15px;
  letter-spacing: -0.02em;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.verified-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  vertical-align: middle;
  animation: verified-pulse 2s ease-in-out infinite;
  margin-left: 8px;
}

.verified-badge svg {
  width: 24px;
  height: 24px;
  display: block;
  filter: drop-shadow(0 2px 4px rgba(24, 119, 242, 0.4));
  transition: transform 0.3s ease;
}

.verified-badge:hover svg {
  transform: scale(1.15);
}

@keyframes verified-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.08);
    opacity: 0.95;
  }
}

/* Dark theme adjustment for verified badge */
.dark-theme .verified-badge svg {
  filter: drop-shadow(0 2px 6px rgba(24, 119, 242, 0.6));
}

.dark-theme .verified-badge svg circle {
  fill: #1877F2;
}

.cv-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background-color: var(--text-color);
  color: var(--bg-color);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition);
  margin-top: 20px;
  margin-bottom: 40px;
  border: 2px solid var(--text-color);
}

.cv-button:hover {
  background-color: transparent;
  color: var(--text-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.dark-theme .cv-button:hover {
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
}

.cv-button svg {
  transition: transform 0.3s ease;
}

.cv-button:hover svg {
  transform: translateY(2px);
}

.quote {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 40px;
  font-style: italic;
  transition: color 0.3s ease;
}

.intro {
  margin-bottom: 30px;
}

.intro p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.info-section {
  margin: 40px 0;
}

.info-item {
  margin-bottom: 25px;
}

.info-item strong {
  display: block;
  font-weight: 600;
  margin-bottom: 10px;
  font-size: 15px;
  color: var(--text-color);
  transition: color 0.3s ease;
}

.info-item span {
  display: inline-block;
  margin-right: 15px;
  margin-bottom: 5px;
  font-size: 15px;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.education {
  margin: 40px 0;
}

.education p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

/* Experience Section */
.experience-section {
  margin: 60px 0;
}

.section-title {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 40px;
  color: var(--text-color);
  transition: color 0.3s ease;
}

.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--border-color);
  transition: background-color 0.3s ease;
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding-left: 30px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -22px;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--bg-color);
  border: 3px solid var(--text-color);
  transition: var(--transition);
  z-index: 1;
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.2);
  box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.1);
}

.dark-theme .timeline-item:hover .timeline-marker {
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.1);
}

.timeline-content {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 25px;
  transition: var(--transition);
}

.timeline-item:hover .timeline-content {
  border-color: var(--text-color);
  transform: translateX(5px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dark-theme .timeline-item:hover .timeline-content {
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.05);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 10px;
}

.timeline-header h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-color);
  margin: 0;
  transition: color 0.3s ease;
}

.timeline-date {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.3s ease;
}

.timeline-company {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 12px;
  transition: color 0.3s ease;
}

.timeline-description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 15px;
  transition: color 0.3s ease;
}

.timeline-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag-small {
  display: inline-block;
  padding: 4px 10px;
  background-color: var(--border-color);
  border-radius: 6px;
  font-size: 12px;
  color: var(--text-color);
  transition: var(--transition);
  font-weight: 500;
}

.tech-tag-small:hover {
  transform: translateY(-2px);
  opacity: var(--hover-opacity);
}

.about {
  margin: 40px 0;
}

.about .section-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-color);
  transition: color 0.3s ease;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
  margin-bottom: 25px;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--text-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dark-theme .stat-card:hover {
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.05);
}

.stat-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--border-color);
  border-radius: 8px;
  color: var(--text-color);
  flex-shrink: 0;
  transition: var(--transition);
}

.stat-card:hover .stat-icon {
  background-color: var(--text-color);
  color: var(--bg-color);
  transform: rotate(5deg);
}

.stat-content {
  flex: 1;
}

.stat-value {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 2px;
  transition: color 0.3s ease;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  transition: color 0.3s ease;
}

/* Progress Section */
.progress-section {
  margin: 25px 0 0 0;
  padding: 20px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  transition: var(--transition);
}

.progress-section:hover {
  border-color: var(--text-color);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.progress-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-color);
  margin: 0;
  transition: color 0.3s ease;
}

.progress-percentage {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-color);
  transition: color 0.3s ease;
}

.progress-bar-container {
  margin-bottom: 10px;
}

.progress-bar {
  width: 100%;
  height: 12px;
  background-color: var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--text-color), var(--text-color));
  border-radius: 6px;
  width: 0%;
  transition: width 1s ease-in-out;
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

.progress-note {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
  transition: color 0.3s ease;
}

/* Academic Info */
.academic-info {
  margin-top: 40px;
}

.academic-info h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 20px;
  transition: color 0.3s ease;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.info-box {
  padding: 15px 20px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--transition);
}

.info-box:hover {
  border-color: var(--text-color);
  transform: translateY(-2px);
}

.info-box strong {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color 0.3s ease;
}

.info-box span {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-color);
  transition: color 0.3s ease;
}

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  background-color: var(--border-color);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-color);
}

.contact {
  margin: 40px 0;
}

.contact p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 10px;
  transition: color 0.3s ease;
}

.contact-links {
  display: flex;
  gap: 20px;
  margin: 15px 0;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  padding: 8px 12px;
  border-radius: 6px;
  position: relative;
  overflow: hidden;
}

.social-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: var(--border-color);
  transition: left 0.3s ease;
  z-index: -1;
}

.social-link:hover::before {
  left: 0;
}

.social-link:hover {
  transform: translateY(-2px);
}

.social-link svg {
  transition: transform 0.3s ease;
}

.social-link:hover svg {
  transform: scale(1.1);
}

.contact a[href^="mailto:"] {
  color: var(--text-color);
  text-decoration: none;
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}

.contact a[href^="mailto:"]:hover {
  opacity: var(--hover-opacity);
  border-bottom-color: var(--text-color);
}

/* Footer */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  margin-top: 60px;
  transition: border-color 0.3s ease;
}

.site-footer p {
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
  transition: color 0.3s ease;
}

/* Page Header */
.page-header {
  margin-bottom: 50px;
}

.page-header h1 {
  font-size: 48px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
  color: var(--text-color);
  transition: color 0.3s ease;
}

.page-header .subtitle {
  font-size: 18px;
  color: var(--text-muted);
  transition: color 0.3s ease;
}

/* Projects */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.project-card {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  transition: var(--transition);
  background-color: var(--bg-color);
}

.project-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  border-color: var(--text-color);
}

.dark-theme .project-card:hover {
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.05);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 15px;
  flex-wrap: wrap;
  gap: 15px;
}

.project-header h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-color);
  transition: color 0.3s ease;
}

.project-links {
  display: flex;
  gap: 15px;
}

.project-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-color);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.project-link:hover {
  background-color: var(--border-color);
  transform: translateY(-2px);
}

.project-link svg {
  transition: transform 0.3s ease;
}

.project-link:hover svg {
  transform: rotate(15deg);
}

.project-description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 15px;
  transition: color 0.3s ease;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-tag {
  display: inline-block;
  padding: 6px 12px;
  background-color: var(--border-color);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-color);
  transition: var(--transition);
}

.tech-tag:hover {
  transform: translateY(-2px);
  opacity: var(--hover-opacity);
}

/* Blog */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.blog-card {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 30px;
  transition: var(--transition);
}

.blog-card:last-child {
  border-bottom: none;
}

.blog-meta {
  display: flex;
  gap: 15px;
  align-items: center;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.blog-category {
  padding: 4px 10px;
  background-color: var(--border-color);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.blog-card h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 15px;
}

.blog-card h2 a {
  color: var(--text-color);
  text-decoration: none;
  transition: var(--transition);
}

.blog-card h2 a:hover {
  opacity: var(--hover-opacity);
}

.blog-excerpt {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 15px;
  transition: color 0.3s ease;
}

.blog-read-more {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.blog-read-more:hover {
  opacity: var(--hover-opacity);
  transform: translateX(5px);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Ripple effect */
.ripple {
  position: absolute;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  transform: scale(0);
  animation: ripple-animation 0.6s ease-out;
  pointer-events: none;
}

.dark-theme .ripple {
  background-color: rgba(255, 255, 255, 0.1);
}

@keyframes ripple-animation {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .name,
  .page-header h1 {
    font-size: 36px;
  }

  .verified-badge svg {
    width: 20px;
    height: 20px;
  }

  .quote {
    font-size: 16px;
  }

  .header-content {
    flex-wrap: wrap;
  }

  .site-header nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    margin-top: 15px;
    flex-wrap: wrap;
    gap: 20px;
  }

  main {
    padding: 40px 0;
  }

  .hero-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .avatar {
    width: 100px;
    height: 100px;
  }

  .avatar-border {
    width: 110px;
    height: 110px;
    top: -5px;
    left: -5px;
  }

  .cv-button {
    margin-top: 15px;
  }

  .contact-links {
    flex-direction: column;
    gap: 10px;
  }

  .project-header {
    flex-direction: column;
  }

  .project-links {
    width: 100%;
  }

  .project-link {
    flex: 1;
    justify-content: center;
  }

  .timeline {
    padding-left: 20px;
  }

  .timeline-item {
    padding-left: 25px;
  }

  .timeline-marker {
    left: -17px;
  }

  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-title {
    font-size: 28px;
  }

  .about .section-title {
    font-size: 24px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 15px;
  }

  .stat-card {
    padding: 15px;
  }

  .stat-value {
    font-size: 24px;
  }

  .progress-section {
    padding: 20px;
  }

  .info-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .academic-info h3 {
    font-size: 18px;
  }
}