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

:root {
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --bg-light: #f9fafb;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
}

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

/* Header & Navigation */
header {
  background: var(--bg-white);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--primary-color);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 6rem 2rem;
  text-align: center;
}

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  opacity: 0.9;
}

.tagline {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  opacity: 0.8;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 0.75rem 2rem;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  transition:
    transform 0.3s,
    box-shadow 0.3s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-primary {
  background: white;
  color: var(--primary-color);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid white;
}

/* About Section */
.about {
  padding: 4rem 2rem;
  background: var(--bg-white);
}

.about h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--text-dark);
}

.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: start;
}

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

.quick-facts {
  background: var(--bg-light);
  padding: 2rem;
  border-radius: 10px;
  border-left: 4px solid var(--primary-color);
}

.quick-facts h3 {
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.quick-facts ul {
  list-style: none;
}

.quick-facts li {
  padding: 0.5rem 0;
  color: var(--text-light);
}

/* Experience Section */
.experience {
  padding: 4rem 2rem;
  background: var(--bg-light);
}

.experience h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
}

.timeline {
  max-width: 900px;
  margin: 0 auto;
}

.timeline-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
}

.timeline-item:last-child {
  border-bottom: none;
}

.timeline-date {
  font-weight: 600;
  color: var(--primary-color);
}

.timeline-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.timeline-content h4 {
  color: var(--text-light);
  font-weight: 500;
  margin-bottom: 1rem;
}

.timeline-content ul {
  margin-left: 1.5rem;
  color: var(--text-light);
}

.timeline-content li {
  margin-bottom: 0.5rem;
}

/* Skills Section */
.skills {
  padding: 4rem 2rem;
  background: var(--bg-white);
}

.skills h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
}

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

.skill-category {
  background: var(--bg-light);
  padding: 2rem;
  border-radius: 10px;
}

.skill-category h3 {
  margin-bottom: 1.5rem;
  color: var(--text-dark);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--primary-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
}

.language,
.education-item {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.language:last-child,
.education-item:last-child {
  border-bottom: none;
}

.thesis {
  font-style: italic;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Contact Section */
.contact {
  padding: 4rem 2rem;
  background: var(--bg-light);
  text-align: center;
}

.contact h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.contact-intro {
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: 3rem;
}

.contact-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.contact-item {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.contact-item .icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
}

.contact-item a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.contact-item a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  background: var(--text-dark);
  color: white;
  text-align: center;
  padding: 2rem;
}

footer p {
  margin: 0.5rem 0;
  opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1.2rem;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

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

  .nav-links {
    gap: 1rem;
  }
}