/* ===================================
   Research Page Styles
   =================================== */

/* ===== RESEARCH HEADER ===== */
.research-header {
  background: linear-gradient(
    135deg,
    rgba(0, 102, 255, 0.05),
    rgba(0, 217, 255, 0.05)
  );
}

/* ===== CATEGORIES ===== */
.research-categories {
  padding: var(--spacing-2xl) 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
}

.categories-tabs {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.category-btn {
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--color-white);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-gray-700);
  cursor: pointer;
  transition: all var(--transition-base);
}

.category-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.category-btn.active {
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-primary-dark)
  );
  border-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

/* ===== FEATURED ARTICLE ===== */
.featured-article {
  padding: var(--spacing-5xl) 0;
  background: var(--color-gray-50);
}

.featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 2px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

.featured-card:hover {
  box-shadow: var(--shadow-2xl);
  transform: translateY(-4px);
}

.featured-image {
  position: relative;
  height: 500px;
}

.image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.placeholder-icon {
  font-size: 120px;
}

.ai-gradient {
  background: linear-gradient(
    135deg,
    rgba(0, 217, 255, 0.2),
    rgba(0, 102, 255, 0.2)
  );
}

.engineering-gradient {
  background: linear-gradient(
    135deg,
    rgba(0, 102, 255, 0.2),
    rgba(124, 58, 237, 0.2)
  );
}

.product-gradient {
  background: linear-gradient(
    135deg,
    rgba(245, 158, 11, 0.2),
    rgba(251, 191, 36, 0.2)
  );
}

.design-gradient {
  background: linear-gradient(
    135deg,
    rgba(236, 72, 153, 0.2),
    rgba(244, 114, 182, 0.2)
  );
}

.research-gradient {
  background: linear-gradient(
    135deg,
    rgba(16, 185, 129, 0.2),
    rgba(52, 211, 153, 0.2)
  );
}

.featured-badge {
  position: absolute;
  top: var(--spacing-lg);
  left: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.featured-content {
  padding: var(--spacing-3xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.article-meta {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.category-tag {
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.category-tag.engineering {
  background: rgba(0, 102, 255, 0.1);
  color: var(--color-primary);
}

.category-tag.ai {
  background: rgba(0, 217, 255, 0.1);
  color: var(--color-secondary);
}

.category-tag.product {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
}

.category-tag.design {
  background: rgba(236, 72, 153, 0.1);
  color: #ec4899;
}

.category-tag.research {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.read-time,
.publish-date {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

.featured-content h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-black);
  line-height: 1.3;
}

.article-excerpt {
  font-size: var(--font-size-lg);
  color: var(--color-gray-700);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.tag {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-gray-100);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-gray-700);
}

.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
  margin-top: auto;
}

.author-info {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-secondary)
  );
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.author-details {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-weight: 600;
  color: var(--color-black);
}

.author-role {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

/* ===== ARTICLES GRID ===== */
.articles-grid {
  padding: var(--spacing-5xl) 0;
  background: var(--color-white);
}

.articles-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-2xl);
}

.article-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-gray-200);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl);
  border-color: var(--color-primary);
}

.article-card.hidden {
  display: none;
}

.card-image {
  height: 220px;
  overflow: hidden;
}

.card-content {
  padding: var(--spacing-xl);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-content h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-black);
  line-height: 1.4;
}

.card-content > p {
  color: var(--color-gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
  flex: 1;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.read-more {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
}

.read-more:hover {
  color: var(--color-primary-dark);
  transform: translateX(5px);
}

/* ===== NEWSLETTER CTA ===== */
.research-cta {
  padding: var(--spacing-5xl) 0;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-primary-dark)
  );
  text-align: center;
  color: var(--color-white);
}

.research-cta h2 {
  color: var(--color-white);
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
}

.research-cta > .cta-content > p {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-2xl);
}

.newsletter-form {
  max-width: 500px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  gap: var(--spacing-md);
}

.newsletter-form input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: none;
  font-size: var(--font-size-base);
}

.newsletter-form .btn {
  white-space: nowrap;
}

.privacy-note {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
}

/* ===== RESEARCH AREAS ===== */
.research-areas {
  padding: var(--spacing-5xl) 0;
  background: var(--color-gray-50);
}

.areas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
}

.area-card {
  background: var(--color-white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-gray-200);
  text-align: center;
  transition: all var(--transition-base);
}

.area-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.area-icon {
  font-size: 60px;
  margin-bottom: var(--spacing-lg);
}

.area-card h3 {
  font-size: var(--font-size-xl);
  color: var(--color-black);
  margin-bottom: var(--spacing-md);
}

.area-card p {
  color: var(--color-gray-600);
  line-height: 1.6;
  margin: 0;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .featured-card {
    grid-template-columns: 1fr;
  }

  .featured-image {
    height: 300px;
  }

  .articles-list {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (max-width: 768px) {
  .categories-tabs {
    flex-direction: column;
  }

  .category-btn {
    width: 100%;
  }

  .featured-content {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .featured-content h2 {
    font-size: var(--font-size-2xl);
  }

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

  .newsletter-form {
    flex-direction: column;
  }

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