/* Color Palette Variables */
:root {
  --bg-beige: #f0e6d2;
  --light-blue: #c0d8e3;
  --medium-blue: #9bb5d7;
  --muted-blue: #7a9ba8;
  --steel-blue: #5a7d8d;
  --dark-blue: #3b5c70;
  --darker-blue: #2e4b58;
  --darkest-blue: #1e3a4d;
  --white: #ffffff;
}

/* Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--darkest-blue);
  background: var(--bg-beige);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Sidebar Navigation */
.sidebar {
  position: fixed;
  top: 0;
  left: -320px;
  width: 300px;
  height: 100vh;
  background: var(--darkest-blue);
  color: var(--white);
  z-index: 1001;
  transition: left 0.3s ease;
  overflow-y: auto;
  box-shadow: 2px 0 10px rgba(0,0,0,0.2);
}

.sidebar.active {
  left: 0;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 25px 20px;
  border-bottom: 1px solid var(--dark-blue);
}

.sidebar-header h2 {
  font-size: 1.5rem;
  color: var(--light-blue);
}

.close-sidebar {
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.8rem;
  cursor: pointer;
  padding: 5px;
  transition: color 0.3s;
}

.close-sidebar:hover {
  color: var(--medium-blue);
}

.sidebar-nav {
  padding: 20px 0;
}

.sidebar-section {
  margin-bottom: 25px;
}

.sidebar-section h3 {
  padding: 10px 20px;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--medium-blue);
  border-bottom: 1px solid var(--dark-blue);
  margin-bottom: 5px;
}

.sidebar-link {
  display: block;
  padding: 12px 20px;
  color: var(--white);
  text-decoration: none;
  transition: all 0.3s;
  border-left: 3px solid transparent;
}

.sidebar-link:hover {
  background: var(--dark-blue);
  border-left-color: var(--medium-blue);
  padding-left: 25px;
}

.sidebar-cta {
  background: var(--dark-blue);
  padding: 20px;
  margin: 20px;
  border-radius: 8px;
  text-align: center;
}

.sidebar-cta h3 {
  color: var(--light-blue);
  margin-bottom: 10px;
  border: none;
  padding: 0;
}

.sidebar-cta p {
  font-size: 0.9rem;
  margin-bottom: 15px;
  color: var(--medium-blue);
}

.apply-button {
  display: inline-block;
  background: var(--medium-blue);
  color: var(--darkest-blue);
  padding: 10px 20px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
}

.apply-button:hover {
  background: var(--light-blue);
  transform: scale(1.05);
}

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.sidebar-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Main Navigation Bar */
.main-nav {
  background: var(--darkest-blue);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.main-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.menu-toggle {
  background: var(--dark-blue);
  color: var(--white);
  border: none;
  padding: 8px 15px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.3s;
}

.menu-toggle:hover {
  background: var(--darker-blue);
}

.logo {
  display: flex;
  align-items: center;
}

.logo a {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.logo img {
  display: block;
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--light-blue);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.logo img:hover {
  transform: scale(1.06);
  border-color: var(--medium-blue);
}

.nav-right {
  display: flex;
  gap: 25px;
}

.nav-right a {
  color: var(--light-blue);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-right a:hover {
  color: var(--medium-blue);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--dark-blue) 0%, var(--darker-blue) 100%);
  color: var(--white);
  padding: 100px 0;
  text-align: center;
}

.hero h1 {
  font-size: 3.2rem;
  margin-bottom: 20px;
  color: var(--light-blue);
}

.hero p {
  font-size: 1.3rem;
  max-width: 700px;
  margin: 0 auto 40px;
  opacity: 0.95;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-button {
  display: inline-block;
  padding: 15px 35px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.1rem;
  transition: all 0.3s;
}

.cta-button.primary {
  background: var(--medium-blue);
  color: var(--darkest-blue);
}

.cta-button.primary:hover {
  background: var(--light-blue);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.cta-button.secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--medium-blue);
}

.cta-button.secondary:hover {
  background: var(--medium-blue);
  color: var(--darkest-blue);
  transform: translateY(-3px);
}

/* Categories Overview */
.categories-overview {
  padding: 80px 0;
}

.categories-overview h2 {
  font-size: 2.8rem;
  text-align: center;
  margin-bottom: 15px;
  color: var(--darkest-blue);
}

.section-intro {
  text-align: center;
  color: var(--darker-blue);
  font-size: 1.15rem;
  margin-bottom: 60px;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 25px;
  margin-bottom: 80px;
}

.category-card {
  background: var(--white);
  padding: 35px;
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.3s;
  border-top: 5px solid var(--medium-blue);
}

.category-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.category-card.pediatrics { border-top-color: #B35C3E; }
.category-card.oncology { border-top-color: #d8a4b1; }
.category-card.policy { border-top-color: var(--steel-blue); }
.category-card.ai { border-top-color: #3498db; }
.category-card.neuro { border-top-color: #9b59b6; }
.category-card.skills { border-top-color: #9ea99f; }
.category-card.spotlights { border-top-color: #e67e22; }
.category-card.breakthroughs { border-top-color: #f1c40f; }
.category-card.updates { border-top-color: var(--darker-blue); }

.category-card h3 {
  font-size: 1.6rem;
  margin-bottom: 12px;
  color: var(--darkest-blue);
}

.category-card p {
  color: var(--darker-blue);
  font-size: 1rem;
  line-height: 1.6;
}

/* Recent Posts */
.recent-posts {
  padding: 80px 0;
  background: var(--white);
  border-radius: 12px;
  margin: 40px 0;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.recent-posts h2 {
  font-size: 2.8rem;
  margin-bottom: 50px;
  color: var(--darkest-blue);
  text-align: center;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 35px;
  padding: 0 20px;
}

.post-card {
  background: var(--bg-beige);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 3px 15px rgba(0,0,0,0.08);
  transition: all 0.3s;
}

.post-card:hover {
  transform: translateY(-7px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.12);
}

.post-card.featured {
  border-left: 5px solid var(--medium-blue);
}

.category-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 15px;
  text-transform: uppercase;
}

.category-tag.pediatrics { background: #B35C3E; color: white; }
.category-tag.oncology { background: #d8a4b1; color: white; }
.category-tag.policy { background: var(--steel-blue); color: white; }
.category-tag.ai { background: #3498db; color: white; }
.category-tag.neuro { background: #9b59b6; color: white; }
.category-tag.skills { background: #9ea99f; color: white; }

.post-card h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
  color: var(--darkest-blue);
}

.post-card p {
  color: var(--darker-blue);
  margin-bottom: 20px;
  font-size: 1rem;
  line-height: 1.6;
}

.read-more {
  color: var(--dark-blue);
  text-decoration: none;
  font-weight: 600;
  display: inline-block;
  transition: all 0.3s;
}

.read-more:hover {
  color: var(--medium-blue);
  transform: translateX(8px);
}

/* About Preview */
.about-preview {
  background: var(--white);
  padding: 60px 50px;
  border-radius: 12px;
  text-align: center;
  margin-bottom: 80px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.about-preview h2 {
  font-size: 2.8rem;
  margin-bottom: 25px;
  color: var(--darkest-blue);
}

.about-preview p {
  font-size: 1.15rem;
  color: var(--darker-blue);
  max-width: 850px;
  margin: 0 auto 25px;
  line-height: 1.8;
}

.team-preview {
  background: var(--bg-beige);
  padding: 25px;
  border-radius: 8px;
  margin: 30px auto;
  max-width: 600px;
}

.team-preview p {
  margin: 10px 0;
  font-size: 1.05rem;
}

.secondary-button {
  display: inline-block;
  background: var(--dark-blue);
  color: var(--white);
  padding: 14px 35px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  transition: all 0.3s;
  margin-top: 15px;
}

.secondary-button:hover {
  background: var(--darker-blue);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

/* Contact Section */
.contact-section {
  padding: 80px 0;
}

.contact-section h2 {
  font-size: 2.8rem;
  text-align: center;
  margin-bottom: 60px;
  color: var(--darkest-blue);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.contact-card {
  background: var(--white);
  padding: 40px 30px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.3s;
}

.contact-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}

.contact-card h3 {
  font-size: 1.8rem;
  margin-bottom: 15px;
  color: var(--darkest-blue);
}

.contact-card p {
  color: var(--darker-blue);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.contact-link {
  color: var(--dark-blue);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  display: inline-block;
  padding: 10px 20px;
  border: 2px solid var(--medium-blue);
  border-radius: 25px;
  transition: all 0.3s;
}

.contact-link:hover {
  background: var(--medium-blue);
  color: var(--darkest-blue);
}

.apply-link {
  background: var(--medium-blue);
  color: var(--darkest-blue);
}

.apply-link:hover {
  background: var(--light-blue);
}

/* Footer */
footer {
  background: var(--darkest-blue);
  color: var(--white);
  padding: 60px 0 30px;
  margin-top: 80px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: var(--light-blue);
}

.footer-section p,
.footer-section ul {
  color: var(--medium-blue);
  font-size: 1rem;
  line-height: 1.8;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 12px;
}

.footer-section a {
  color: var(--medium-blue);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: var(--light-blue);
}

.footer-team {
  margin-top: 15px;
  font-size: 0.95rem;
  font-style: italic;
}

.copyright {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  color: var(--medium-blue);
  font-size: 0.95rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .category-grid,
  .posts-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .nav-right {
    display: none;
  }
}

/* About Page Specific Styles */
.page-header {
  background: linear-gradient(135deg, var(--dark-blue) 0%, var(--darker-blue) 100%);
  color: var(--white);
  padding: 80px 0;
  text-align: center;
}

.page-header h1 {
  font-size: 3.2rem;
  color: var(--light-blue);
}

.about-content {
  padding: 70px 50px;
  background: var(--white);
  border-radius: 12px;
  margin: 50px 0;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.about-content h2 {
  font-size: 2.2rem;
  color: var(--darkest-blue);
  margin-bottom: 25px;
  margin-top: 50px;
  border-bottom: 3px solid var(--medium-blue);
  padding-bottom: 10px;
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content p {
  font-size: 1.1rem;
  color: var(--darker-blue);
  line-height: 1.8;
  margin-bottom: 20px;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.team-member {
  background: var(--bg-beige);
  padding: 35px;
  border-radius: 10px;
  border-left: 5px solid var(--medium-blue);
}

.team-member h3 {
  font-size: 1.8rem;
  color: var(--darkest-blue);
  margin-bottom: 8px;
}

.team-role {
  font-size: 1.1rem;
  color: var(--dark-blue);
  font-weight: 600;
  margin-bottom: 15px;
  font-style: italic;
}

.team-member p {
  font-size: 1.05rem;
  line-height: 1.7;
}

.feature-list {
  list-style: none;
  margin: 40px 0;
  background: var(--bg-beige);
  padding: 35px;
  border-radius: 10px;
}

.feature-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--medium-blue);
  font-size: 1.1rem;
  line-height: 1.6;
}

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

.about-content a {
  color: var(--dark-blue);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid var(--medium-blue);
}

.about-content a:hover {
  color: var(--medium-blue);
}

/* Category Page Headers with Different Backgrounds */
.category-header {
  background: linear-gradient(135deg, var(--dark-blue) 0%, var(--darker-blue) 100%);
  color: var(--white);
  padding: 80px 0;
  text-align: center;
}

.category-header.pediatrics-bg {
  background: linear-gradient(135deg, #DCD1C4 0%, #DCD1C4 100%);
}

.category-header.oncology-bg {
  background: linear-gradient(135deg, #d8a4b1 0%, #d8a4b1 100%);
}

.category-header.policy-bg {
  background: linear-gradient(135deg, var(--steel-blue) 0%, var(--dark-blue) 100%);
}

.category-header.ai-bg {
  background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
}

.category-header.neuro-bg {
  background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%);
}

.category-header.skills-bg {
  background: linear-gradient(135deg, #9ea99f 0%, #9ea99f 100%);
}

.category-header.updates-bg {
  background: linear-gradient(135deg, var(--darker-blue) 0%, var(--darkest-blue) 100%);
}

.category-header h1 {
  font-size: 3.2rem;
  margin-bottom: 15px;
  color: var(--white);
}

.category-description {
  font-size: 1.25rem;
  max-width: 750px;
  margin: 0 auto;
  opacity: 0.95;
}

/* Posts List */
.posts-list {
  padding: 70px 20px;
  max-width: 900px;
  margin: 0 auto;
}

.post-item {
  background: var(--white);
  padding: 40px;
  margin-bottom: 35px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.3s;
  border-left: 5px solid var(--medium-blue);
}

.post-item:hover {
  transform: translateX(8px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.post-meta {
  display: flex;
  gap: 15px;
  margin-bottom: 15px;
  align-items: center;
  flex-wrap: wrap;
}

.post-date {
  color: var(--muted-blue);
  font-size: 0.95rem;
  font-style: italic;
}

.post-item h2 {
  font-size: 2rem;
  margin-bottom: 18px;
  color: var(--darkest-blue);
}

.post-item h2 a {
  color: var(--darkest-blue);
  text-decoration: none;
  transition: color 0.3s;
  border-bottom: 2px solid transparent;
}

.post-item h2 a:hover {
  color: var(--dark-blue);
  border-bottom-color: var(--medium-blue);
}

.post-item p {
  color: var(--darker-blue);
  font-size: 1.1rem;
  margin-bottom: 25px;
  line-height: 1.7;
}

.no-posts-yet {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted-blue);
  font-size: 1.2rem;
  font-style: italic;
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

/* Additional CSS for sidebar sections */
.sidebar-section {
  margin-bottom: 25px;
}

.sidebar-section h3 {
  padding: 10px 20px;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--medium-blue);
  border-bottom: 1px solid var(--dark-blue);
  margin-bottom: 5px;
}