/* ========================================
   About Section
   ======================================== */
.section-about {
  background: var(--bg-primary);
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about-lead {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  line-height: 1.5;
}

.about-details p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.7;
}

.about-details p + p {
  margin-top: var(--space-sm);
}

.about-stats {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--divider);
}

.about-video {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-secondary);
  aspect-ratio: 16/10;
}

.about-video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 768px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .about-video {
    aspect-ratio: 16/9;
    order: -1;
  }
}

.stat-item {
  text-align: center;
}

.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-xs);
}

/* ========================================
   Projects Section
   ======================================== */
.section-projects {
  background: var(--bg-secondary);
}

.project-category {
  margin-bottom: var(--space-xl);
}

.project-category:last-child {
  margin-bottom: 0;
}

.category-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.project-item {
  border-top: 1px solid var(--divider);
  padding-top: var(--space-md);
}

.project-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-xs);
}

.project-name {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.project-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

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

.project-desc {
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

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

.stack-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-primary);
  padding: 0.2rem 0.5rem;
}

/* Project Cards */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.project-card {
  border: 1px solid var(--divider);
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base);
  background: var(--bg-primary);
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.project-card:active {
  transform: translateY(-1px) scale(0.99);
}

.project-card-image {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}

.project-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-card-image img {
  transform: scale(1.05);
}

.project-card-content {
  padding: var(--space-md);
}

.project-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.project-card-name {
  font-size: 1.15rem;
  font-weight: 600;
}

.project-card-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}

.project-card-link:hover {
  text-decoration: underline;
}

.project-card-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}

.project-card-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.project-card-link-wrapper {
  display: block;
}

/* ========================================
   Articles Section
   ======================================== */
.section-articles {
  background: var(--bg-primary);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.article-card {
  background: var(--bg-secondary);
  border: 1px solid var(--divider);
  padding: 1.25rem;
  transition: border-color var(--transition-base), transform var(--transition-base);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.article-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.article-card:active {
  transform: translateY(-1px) scale(0.99);
}

.article-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: 0.75rem;
}

.article-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent);
  border: 1px solid var(--divider);
  padding: 0.2rem 0.5rem;
  white-space: nowrap;
}

.article-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.82rem;
  line-height: 1.5;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--divider);
  margin-top: auto;
}

.article-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.article-read {
  font-size: 0.85rem;
  color: var(--accent);
}

/* Articles "View More" Link */
.articles-more {
  text-align: center;
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--divider);
}

.articles-more-link {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--divider);
  transition: border-color var(--transition-base), background-color var(--transition-base);
}

.articles-more-link:hover {
  border-color: var(--accent);
  background-color: rgba(0, 240, 255, 0.08);
  opacity: 1;
}

/* ========================================
   Skills Section
   ======================================== */
.section-skills {
  background: var(--bg-primary);
}

.skills-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.skill-category {
  border-top: 1px solid var(--divider);
  padding-top: var(--space-md);
}

.skill-category-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  border: 1px solid var(--divider);
  padding: 0.35rem 0.75rem;
  letter-spacing: 0.02em;
  transition: border-color var(--transition-base), background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.tag:hover {
  border-color: var(--accent);
  background-color: rgba(0, 240, 255, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 2px 8px rgba(0, 240, 255, 0.15);
}

.tag--xinchuang {
  color: #ff6b35;
  border-color: rgba(255, 107, 53, 0.4);
  background: rgba(255, 107, 53, 0.08);
}

.tag--xinchuang:hover {
  border-color: #ff6b35;
  background: rgba(255, 107, 53, 0.15);
  box-shadow: 0 2px 8px rgba(255, 107, 53, 0.15);
}

/* AI tags — cyan accent with stronger presence */
.tag--ai {
  color: var(--accent);
  border-color: rgba(0, 240, 255, 0.3);
  background: rgba(0, 240, 255, 0.06);
}

.tag--ai:hover {
  border-color: var(--accent);
  background: rgba(0, 240, 255, 0.15);
  box-shadow: 0 2px 12px rgba(0, 240, 255, 0.2);
}

.skills-summary {
  grid-column: 1 / -1;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--divider);
  line-height: 1.6;
}

/* ========================================
   Contact Section
   ======================================== */
.section-contact {
  background: var(--bg-secondary);
  text-align: center;
  padding: var(--space-md) var(--space-md);
}

.section-contact .section-inner {
  max-width: 900px;
}

.contact-lead {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.contact-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
  animation: statusPulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px rgba(0, 240, 255, 0.5); }
  50% { opacity: 0.6; box-shadow: 0 0 14px rgba(0, 240, 255, 0.8); }
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.contact-link {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.4rem 1.5rem;
  border: 1px solid var(--divider);
  flex: 1 1 160px;
  max-width: 240px;
  white-space: nowrap;
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.contact-link:hover {
  border-color: var(--accent);
  background-color: rgba(0, 240, 255, 0.06);
  opacity: 1;
}

.contact-link:active {
  transform: scale(0.98);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.contact-handle {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.contact-additional {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--divider);
}

.contact-additional p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.contact-additional p:last-child {
  margin-bottom: 0;
}

@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .skills-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}

@media (max-width: 768px) {
  .about-stats {
    flex-direction: column;
    gap: var(--space-md);
  }

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

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

  .skills-container {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .contact-link {
    min-width: auto;
    width: 100%;
    flex: 1 1 100%;
  }
}