/* === Projects Section === */
.projects {
  padding: var(--space-3xl) var(--space-xl);
  min-height: 100vh;
  text-align: left;
}

.projects .header {
  text-align: center;
  margin-bottom: 40px;
}

.projects .header h2 {
  font-size: 2.5rem;
  color: #333;
}

.projects .header h2::after {
  content: "";
  display: inline-block;
  width: 70%;
  max-width: 150px;
  min-width: 50px;
  height: 4px;
  background: var(--primary-color);
  margin: 8px auto 0;
  border-radius: 5px;
}

/* === Hero Section === */
.projects .hero-content {
  max-width: 600px;
  margin-left: 20px;
  text-align: left;
  margin-bottom: var(--space-2xl);
}

.projects .hero-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.projects .meta-divider {
  color: var(--text-tertiary);
}

.projects .hero-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: var(--text-light);
}

.projects .hero-description {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 500px;
}

/* === Projects Grid Layout === */
.projects-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

/* === Project List === */
.project-list {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-xl));
  padding-left: 20px;
  border-left: 2px solid var(--border-light);
}

.project-item {
  padding: var(--space-2xl) 0;
  min-height: 180px;
  border-bottom: 1px solid var(--border-light);
  opacity: 0.4;
  transition: opacity 0.5s ease;
  cursor: pointer;
  scroll-margin-top: calc(var(--nav-height) + 20px);
  text-align: left;
}

.project-item.active {
  opacity: 1;
}

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

.project-header,
.project-content,
.project-meta,
.project-title,
.project-description,
.project-stack,
.project-links {
  margin-left: 0;
  padding-left: 0;
  text-align: left;
}

.project-meta {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-number {
  color: var(--text-tertiary);
  font-weight: 600;
}

.project-year {
  color: var(--text-secondary);
}

.project-status {
  padding: var(--space-xs) var(--space-sm);
  background: var(--accent-green);
  color: white;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
}

.project-status.prototype {
  background: #ffc107;
  color: #000;
}

.project-content {
  max-width: 480px;
}

.project-title {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text-light);
}

.project-description {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.stack-item {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  padding: var(--space-xs) var(--space-sm);
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  border-radius: 4px;
}

.project-links {
  display: flex;
  gap: var(--space-lg);
}

.project-link {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  transition: var(--transition-base);
}

.project-link.secondary {
  color: var(--text-secondary);
}

.project-link:hover {
  color: var(--primary-color);
}

/* === Project Preview === */
.project-preview {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-xl));
  height: 70vh;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 1px;
  overflow: hidden;
  background: var(--surface-light);
  border: 1px solid var(--border-light);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.preview-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.preview-image.active {
  opacity: 1;
}

.preview-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: opacity 0.6s ease;
  border-radius: 1px;
  opacity: 0;
}

.preview-image img.loaded {
  opacity: 1;
}

/* === Progress Bar === */
.progress-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: var(--space-xl);
  right: var(--space-xl);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.progress-track {
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 1px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary-color);
  width: 20%;
  transition: width 0.4s ease;
  border-radius: 1px;
}

.progress-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.current-project {
  color: var(--text-light);
  font-weight: 600;
}

.progress-text::before {
  content: '/';
  color: var(--text-tertiary);
}

/* === Responsive Layout === */
@media (max-width: 1024px) {
  .projects-container {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .project-item {
    opacity: 1;
  }
}

@media (max-width: 768px) {
  .projects {
    padding: var(--space-2xl) var(--space-md);
  }

  .projects .hero-content {
    padding-left: 20px;
    margin-left: 0;
    margin-bottom: var(--space-lg);
  }

  .projects-container {
    padding-left: 0;
  }

  .project-list {
    padding-left: 20px;
    border-left: 2px solid var(--border-light);
  }

  .project-title {
    font-size: 1.5rem;
  }

  .project-links {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .progress-indicator {
    bottom: var(--space-md);
    left: var(--space-md);
    right: var(--space-md);
  }

  .project-preview {
    display: none !important; /* ✅ hide preview image on mobile */
  }
}

@media (max-width: 480px) {
  .projects .hero-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }

  .projects .meta-divider {
    display: none;
  }

  .project-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .project-stack {
    gap: var(--space-xs);
  }

  .stack-item {
    font-size: 0.75rem;
  }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.project-item:focus,
.project-link:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* === Focus Handling for .project-item === */
.project-item:focus {
  outline: none;
}

.project-item:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 4px;
  border-radius: 8px;
}