/* -------------------------------- Variables -------------------------------- */
:root {
    --primary-color: #2D4263;
    --accent-color: #C84B31;
    --bg-color: #f0f0f2;
    --text-color: #191919;
    --light-color: #F9F9F9;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
  }
  
  /* -------------------------------- Global Styles -------------------------------- */
  body {
    font-family: 'Roboto', Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
  }
  
  h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
  }
  
  h1 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary-color);
  }
  
  h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
  }
  
  h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
  }
  
  p {
    text-align: justify;
    font-size: 1rem;
  }
  
  a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
  }
  
  a:hover {
    color: var(--primary-color);
  }
  
  /* -------------------------------- Header -------------------------------- */
  header {
    background-color: var(--light-color);
    color: var(--primary-color);
    padding: 1rem 2rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .logo a {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
  }
  
  nav ul {
    display: flex;
    list-style-type: none;
    margin: 0;
    padding: 0;
    gap: 1.5rem;
  }
  
  nav li {
    margin: 0;
  }
  
  nav a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
  }
  
  nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
  }
  
  nav a:hover::after {
    width: 100%;
  }
  
  .menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
    flex-shrink: 0;
    width: auto;
    max-width: 50px;
    text-align: center;
  }
  
  /* -------------------------------- Layout -------------------------------- */
  .container, .main-container, .content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    box-sizing: border-box;
  }
  
  .main-container {
    display: flex;
    gap: 2rem;
  }
  
  .content-section {
    flex: 2;
  }
  
  /* For pages with sidebar profile */
  .picture-section {
    flex: 1;
    position: sticky;
    top: 2rem;
    align-self: flex-start;
    height: fit-content;
  }
  
  @media (max-width: 768px) {
    .container, .main-container, .content-container {
      padding: 1.5rem 1rem;
    }
    
    .main-container {
      flex-direction: column;
    }
    
    .picture-section {
      position: static;
    }
  }
  
  /* -------------------------------- Cards -------------------------------- */
  .card, .section-card, .publication-card, .blog-card {
    background-color: var(--light-color);
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
  }
  
  .card:hover, .section-card:hover, .publication-card:hover, .blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
  }
  
  .card.visible, .section-card.visible, .publication-card.visible, .blog-card.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  /* Animation for cards */
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  /* Button styles for consistency */
  .btn, .pub-btn, .filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.85rem;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
  }
  
  .btn, .pub-btn {
    background-color: var(--light-color);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
  }
  
  .btn:hover, .pub-btn:hover {
    background-color: var(--primary-color);
    color: white;
  }
  
  .btn.primary, .pub-btn.primary {
    background-color: var(--primary-color);
    color: white;
  }
  
  .btn.primary:hover, .pub-btn.primary:hover {
    background-color: #22354d;
  }
  
  /* -------------------------------- Footer -------------------------------- */
  footer {
    background-color: var(--primary-color);
    color: var(--light-color);
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
  }
  
  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
  }
  
  footer p {
    margin: 0.5rem 0;
    text-align: center;
  }
  
  footer a {
    color: var(--bg-color);
    transition: var(--transition);
  }
  
  footer a:hover {
    color: var(--accent-color);
  }
  
  /* -------------------------------- Responsive -------------------------------- */
  @media (max-width: 768px) {
    header {
      padding: 0.8rem 1rem;
    }
    
    .header-container {
      padding: 0;
      gap: 1rem;
    }
    
    .logo a {
      font-size: 1.3rem;
    }
    
    .menu-toggle {
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0.6rem;
      width: 44px;
      height: 44px;
      font-size: 1.2rem;
      background-color: transparent;
      border: 1px solid var(--primary-color);
      border-radius: 6px;
      transition: var(--transition);
      flex-shrink: 0;
    }
    
    .menu-toggle:hover {
      background-color: var(--primary-color);
      color: white;
    }
    
    nav ul {
      display: none;
      flex-direction: column;
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      width: 100%;
      background-color: var(--light-color);
      padding: 1rem;
      box-shadow: 0 5px 10px rgba(0,0,0,0.1);
      margin: 0;
      gap: 0.5rem;
    }
    
    nav ul.show {
      display: flex;
    }
    
    nav li {
      width: 100%;
    }
    
    nav a {
      display: block;
      padding: 0.8rem 1rem;
      border-radius: 4px;
      transition: var(--transition);
    }
    
    nav a:hover {
      background-color: var(--bg-color);
    }
  }