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

/* CSS variables for consistency */
:root {
  --primary-color: #0078d4;
  --text-color: #222;
  --text-light: #444;
  --text-muted: #888;
  --background: #f7f7fa;
  --white: #fff;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  --border-radius: 8px;
  --transition: all 0.2s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: monospace, "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--background);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  font-size: 16px;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 1000;
}

.skip-link:focus {
  top: 6px;
}

/* Skeletons */
.skeleton {
  animation: skeleton-loading 1s linear infinite alternate;
  border-radius: 0.25rem;
}

@keyframes skeleton-loading {
  0% {
    background-color: hsl(0, 0%, 47%);
  }
  100% {
    background-color: hsl(200, 20%, 95%);
  }
}

.skeleton-text {
  width: 100%;
  height: 1.3rem;
}

.skeleton-text-sm {
  width: 50%;
  height: 1.3rem;
}

.skeleton-title {
  width: 25%;
  height: 2rem;
}

.skeleton-subtitle {
  width: 25%;
  height: 1.5rem;
}

/* Visible focus indicator */
*:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Main content */
main {
  min-height: calc(100vh - 200px);
}

/* Section */
section {
  max-width: 1200px;
  margin: 2rem auto;
  background: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

section h2 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: clamp(0.5rem, 4vw, 2rem);
  font-weight: 600;
}

section div {
  margin-bottom: 1rem;
  color: var(--text-light);
}

/* Timeline/Experience */
.timeline {
  position: relative;
  margin: 3rem auto 0;
  padding: 2rem 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(
    180deg,
    var(--primary-color) 0%,
    rgba(0, 120, 212, 0.3) 100%
  );
  transform: translateX(-50%);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
  width: 100%;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.timeline-item:nth-child(1) {
  animation-delay: 0.1s;
}
.timeline-item:nth-child(2) {
  animation-delay: 0.3s;
}
.timeline-item:nth-child(3) {
  animation-delay: 0.5s;
}

/* The typewriter cursor effect */
@keyframes blink-caret {
  from,
  to {
    border-color: transparent;
  }
  50% {
    border-color: orange;
  }
}

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

.timeline-item:nth-child(odd) {
  padding-right: calc(50% + 3rem);
  text-align: right;
}

.timeline-item:nth-child(even) {
  padding-left: calc(50% + 3rem);
  text-align: left;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 2rem;
  width: 16px;
  height: 16px;
  background: var(--white);
  border: 4px solid var(--primary-color);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(0, 120, 212, 0.2);
  z-index: 2;
  transition: all 0.3s ease;
}

.timeline-item:hover::before {
  transform: scale(1.2);
  box-shadow: 0 0 0 8px rgba(0, 120, 212, 0.3);
}

.timeline-item:nth-child(odd)::before {
  right: calc(50% - 12px);
}

.timeline-item:nth-child(even)::before {
  left: calc(50% - 12px);
}

.timeline-date {
  display: inline-block;
  background: var(--primary-color);
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(0, 120, 212, 0.3);
}

.timeline-content,
.education-content {
  background: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(0, 120, 212, 0.1);
  position: relative;
  transition: all 0.3s ease;
  overflow: hidden;
}

.timeline-content::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), #00bcf2);
}

.timeline-content:hover,
.education-content:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.timeline-item:nth-child(odd) .timeline-content::after {
  content: "";
  position: absolute;
  top: 2rem;
  right: -10px;
  width: 0;
  height: 0;
  border: 10px solid transparent;
  border-left-color: var(--white);
}

.timeline-item:nth-child(even) .timeline-content::after {
  content: "";
  position: absolute;
  top: 2rem;
  left: -10px;
  width: 0;
  height: 0;
  border: 10px solid transparent;
  border-right-color: var(--white);
}

.timeline-content h3 {
  margin-bottom: 0.5rem;
  color: var(--text-color);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: start;
}

.timeline-content h4 {
  margin-bottom: 1rem;
  color: var(--primary-color);
  font-size: 1.2rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timeline-content h4::before {
  content: "🏢";
  font-size: 1rem;
}

.timeline-content .period {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-style: italic;
  font-weight: 500;
}

.timeline-content p:not(.period) {
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: var(--text-light);
}

.technologies {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.tech-tag {
  background: linear-gradient(45deg, var(--primary-color), #00bcf2);
  color: var(--white);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(0, 120, 212, 0.3);
  transition: all 0.3s ease;
}

.tech-tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 120, 212, 0.4);
}

/* Footer */
footer {
  display: flex;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  padding: 2rem 0;
  color: var(--text-muted);
  background: #f0f0f0;
  padding: 2em;
  font-size: 0.95rem;
}

footer div {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 0.5rem;
}

footer a {
  color: var(--primary-color);
  text-decoration: none;
  margin: 0 0.5rem;
  transition: var(--transition);
}

footer a:hover,
footer a:focus {
  text-decoration: underline;
}

/* Performance optimizations */
img {
  max-width: 100%;
  height: auto;
}

.TODO::before {
  content: "TO-DO: Work in progress";
  background: rgba(255, 0, 0, 0.5);
  color: var(--white);
  padding: 0.25rem 0.5rem;
  font-size: 1.75rem;
  border-radius: 4px;
}

/* Responsive Design */
@media (max-width: 768px) {
  section {
    margin: 1rem;
    padding: 1.5rem;
  }

  /* Mobile timeline styles */
  .timeline {
    padding: 1rem;
  }

  .timeline::before {
    left: 1.6rem;
    width: 2px;
  }

  .timeline-item {
    padding-left: 2rem !important;
    padding-right: 1rem !important;
    text-align: left !important;
    margin-bottom: 3rem;
  }

  .timeline-item::before {
    left: 0rem !important;
    right: auto !important;
    top: 1.5rem;
    width: 12px;
    height: 12px;
  }

  .timeline-item:hover::before {
    transform: scale(1.1);
  }

  .timeline-date {
    margin-bottom: 1rem;
    display: inline-block;
  }

  .timeline-content {
    margin-left: 0;
    padding: 1.5rem;
  }

  .timeline-content::after {
    display: none;
  }

  .timeline-content h4 {
    font-size: 1.1rem;
  }

  .timeline-content h3 {
    font-size: 1.2rem;
  }

  .technologies {
    justify-content: flex-start;
    gap: 0.5rem;
  }

  .tech-tag {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
  }
}

@media (max-width: 480px) {
  section {
    padding: 1rem;
  }

  nav ul {
    flex-direction: column;
    gap: 0.1rem;
  }
}

/* Smooth animations */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .timeline-item {
    opacity: 1;
    animation: none;
  }

  .timeline-content:hover {
    transform: none;
  }

  .tech-tag:hover {
    transform: none;
  }
}