/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #fcfcfc;
  color: #111111;
  line-height: 1.6;
}

/* Main container */
main#main-content {
  max-width: 1000px;
  width: 100vw;
  margin: 0 auto;
  padding: 3rem 4vw;
}

/* Section header */
#experience h2 {
  font-size: 3.2rem;
  font-weight: 900;
  color: #000000;
  text-align: center;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: #666666;
  margin-bottom: 3rem;
  font-style: italic;
}

/* Timeline container */
.timeline {
  position: relative;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, #000000 0%, #666666 100%);
  border-radius: 2px;
}

/* Experience items */
.experience-item {
  position: relative;
  padding-left: 80px;
  margin-bottom: 3rem;
}

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

/* Timeline markers */
.timeline-marker {
  position: absolute;
  left: 0;
  top: 20px;
  width: 60px;
  height: 60px;
  background-color: #000000;
  border: 4px solid #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  z-index: 10;
}

.timeline-marker i {
  color: #ffffff;
  font-size: 1.3rem;
}

.experience-item:hover .timeline-marker,
.experience-item:focus-within .timeline-marker {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

/* Experience cards */
.experience-card {
  background-color: #ffffff;
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
  border: 1px solid #e8e8e8;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.experience-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #000000 0%, #555555 100%);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.experience-item:hover .experience-card,
.experience-item:focus-within .experience-card {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.experience-item:hover .experience-card::before,
.experience-item:focus-within .experience-card::before {
  transform: scaleX(1);
}

/* Experience header */
.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.company-info h3 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #000000;
  margin-bottom: 0.5rem;
}

.role-badge {
  background-color: #000000;
  color: #ffffff;
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-block;
}

.date-location {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.3rem;
}

.date {
  font-weight: 600;
  color: #000000;
  font-size: 1rem;
}

.location {
  color: #666666;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* Highlights section */
.highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 1rem;
  background-color: #f8f8f8;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.highlight-item:hover {
  background-color: #eeeeee;
  transform: translateX(5px);
}

.highlight-item i {
  color: #333333;
  font-size: 1.1rem;
}

/* Achievements section */
.achievements {
  margin-bottom: 2rem;
}

.achievements h4 {
  font-size: 1.3rem;
  color: #000000;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.achievements h4 i {
  color: #333333;
}

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

.achievements li {
  padding: 0.7rem 0;
  padding-left: 1.5rem;
  position: relative;
  border-bottom: 1px solid #f0f0f0;
  transition: all 0.3s ease;
}

.achievements li:last-child {
  border-bottom: none;
}

.achievements li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: #333333;
  font-weight: bold;
  transition: all 0.3s ease;
}

.achievements li:hover {
  padding-left: 2rem;
  color: #333333;
}

.achievements li:hover::before {
  color: #000000;
}

/* Tech stack section */
.tech-stack h4 {
  font-size: 1.3rem;
  color: #000000;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tech-stack h4 i {
  color: #333333;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.tech-tag {
  background-color: #f0f0f0;
  color: #333333;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: default;
}

.tech-tag:hover {
  background-color: #000000;
  color: #ffffff;
  transform: translateY(-2px);
}

/* Future experience item */
.experience-item.future .timeline-marker {
  background-color: #666666;
}

.future-card {
  background-color: #f8f8f8;
  border: 2px dashed #cccccc;
  text-align: center;
  padding: 2rem;
}

.future-card h3 {
  color: #666666;
  margin-bottom: 1rem;
}

.future-card p {
  color: #888888;
  font-style: italic;
}



/* Responsive design */
@media (max-width: 768px) {
  main#main-content {
    padding: 2rem 6vw;
  }

  #experience h2 {
    font-size: 2.5rem;
  }

  .timeline::before {
    left: 20px;
  }

  .experience-item {
    padding-left: 60px;
  }

  .timeline-marker {
    width: 40px;
    height: 40px;
    left: 0;
  }

  .timeline-marker i {
    font-size: 1rem;
  }

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

  .date-location {
    align-items: flex-start;
  }

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

@media (max-width: 480px) {
  main#main-content {
    padding: 1.5rem 8vw;
  }

  .experience-card {
    padding: 1.5rem;
  }

  .tech-tags {
    justify-content: center;
  }
}

/* Focus accessibility */
.experience-item:focus-visible {
  outline: 3px solid #000000;
  outline-offset: 4px;
  border-radius: 8px;
}