:root {
      --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
      --tertiary-gradient: linear-gradient(135deg, #69c5fa 0%, #5151e5 100%);
      --card-shadow: 0 8px 25px rgba(0,0,0,0.1);
      --card-hover-shadow: 0 12px 35px rgba(0,0,0,0.15);
    }

    body {
      display: flex;
      flex-direction: column;
      background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
      min-height: 100vh;
      font-family: 'Segoe UI', Tahoma, Verdana, sans-serif;
    }

    .main-header {
      background: var(--primary-gradient);
      border-radius: 20px;
      color: white;
      padding: 2rem;
      margin-bottom: 2rem;
      box-shadow: var(--card-shadow);
    }

    .main-header h1 {
      font-weight: 700;
      margin-bottom: 0.5rem;
    }

    .main-header .lead {
      opacity: 0.9;
      font-size: 1.1rem;
    }

    .controls-section {
      background: white;
      border-radius: 15px;
      padding: 1.5rem;
      margin-bottom: 2rem;
      box-shadow: var(--card-shadow);
    }

    .event-card {
      background: white;
      border: none !important; 
      border-radius: 15px !important;
      box-shadow: var(--card-shadow) !important;
      transition: all 0.3s ease;
      overflow: hidden;
      position: relative;
    }

    .event-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 5px;
      height: 100%;
      background: var(--secondary-gradient);
    }

    .event-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-hover-shadow);
    }

    .event-card .card-body {
      padding: 1.5rem;
      padding-left: 2rem;
    }

    .year-badge {
      background: var(--primary-gradient) !important;
      color: white;
      font-weight: 600;
      padding: 0.5rem 1rem;
      border-radius: 50px;
      font-size: 0.9rem;
    }

    .event-text {
      color: #2c3e50;
      line-height: 1.6;
      margin: 1rem 0;
      font-size: 1.05rem;
    }

    .wiki-btn {
      background: var(--secondary-gradient);
      border: none;
      color: white;
      border-radius: 25px;
      padding: 0.5rem 1.2rem;
      font-weight: 500;
      transition: all 0.3s ease;
    }

    .wiki-btn:hover {
      color: white;
      transform: scale(1.05);
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    }

    .form-control, .form-select {
      border-radius: 30px !important;
      border: 2px solid #e9ecef;
      padding: 0.75rem 1rem;
      transition: all 0.3s ease;
    }

    .form-control:focus, .form-select:focus {
      border-color: #667eea;
      box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    }

    .btn-primary {
      background: var(--tertiary-gradient);
      border: none;
      border-radius:30px !important;
      padding: 0.75rem 1.5rem;
      font-weight: 500;
      transition: all 0.3s ease;
      overflow: hidden;
    }

    .btn-primary:hover {
      transform: scale(1.02);
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    }

    .loading-container {
      text-align: center;
      padding: 3rem;
      background: white;
      border-radius: 15px;
      box-shadow: var(--card-shadow);
    }

    .spinner-border {
      width: 3rem;
      height: 3rem;
      border-width: 0.3rem;
    }

    .fade-in {
      animation: fadeIn 0.5s ease-in;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .event-count {
      background: var(--secondary-gradient);
      color: white;
      padding: 0.5rem 1rem;
      border-radius: 25px;
      font-size: 0.9rem;
      font-weight: 500;
    }

    .navigation-tabs {
      display: flex;
      gap: 1rem;
      justify-content: center;
      margin-bottom: 2rem;
    }

    .nav-tab {
      background: white;
      border: 2px solid #e9ecef;
      border-radius: 25px;
      padding: 0.75rem 1.5rem;
      font-weight: 500;
      color: #6c757d;
      cursor: pointer;
      transition: all 0.3s ease;
      position: relative;
    }

    .nav-tab:hover {
      border-color: #667eea;
      color: #667eea;
      transform: translateY(-2px);
    }

    .nav-tab.active {
      background: var(--secondary-gradient);
      border-color: none;
      color: white;
      box-shadow: var(--card-shadow);
      background-clip: padding-box;
    }

    .navigation-tabs .nav-tab .favorites-count {
      display: inline-flex !important;
      align-items: center;
      justify-content: center;
      width: 1.5rem !important;
      height: 1.5rem !important;
      padding: 0 !important;
      background: var(--tertiary-gradient) !important;
      color: #fff !important;
      border-radius: 50% !important;
      font-size: 0.75rem;
      font-weight: 600;
      margin-left: 0.5rem;
    }

    .favorites-controls {
      background: white;
      border-radius: 15px;
      padding: 1.5rem;
      margin-bottom: 2rem;
      box-shadow: var(--card-shadow);
      border-left: 5px solid #e25555;
    }

    .favorite-btn {
      background: transparent;
      border: none;
      color: #bbb;
      font-size: 1.5rem;
      cursor: pointer;
      transition: all 0.3s ease;
      padding: 0.2rem;
      border-radius: 50%;
      line-height: 1;
      transition: color 0.3s ease; background 0.3s ease;
    }

    .favorite-btn:hover {
      color: #e25555;
      background: rgba(226, 85, 85, 0.1);
    }

    .favorite-btn.favorited {
      color: #e25555;
      animation: heartBeat 0.3s ease-in-out;
    }

    @keyframes heartBeat {
      0%   { transform: scale(1);   }
      50%  { transform: scale(1.2); }
      100% { transform: scale(1);   }
    }

    .empty-favorites {
      text-align: center;
      padding: 3rem;
      background: white;
      border-radius: 15px;
      box-shadow: var(--card-shadow);
      color: #6c757d;
    }

    .empty-favorites i {
      font-size: 3rem;
      margin-bottom: 1rem;
      color: #e9ecef;
    }

    @media (max-width: 768px) {
      .navigation-tabs {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
      }
      
      .nav-tab {
        width: 100%;
        max-width: 250px;
        text-align: center;
      }
      
      .main-header {
        padding: 1.5rem;
        border-radius: 15px;
      }
      
      .controls-section {
        padding: 1rem;
      }
      
      .event-card .card-body {
        padding: 1rem;
        padding-left: 1.5rem;
      }
    }

.site-footer {
  margin-top: auto;
  padding: 1rem 0;
  background-color: #f8f9fa;
  color: #6c757d; 
  font-size: 0.9rem;
}

.site-footer .brand {
  font-weight: 600;
}

.site-footer .heart {
  color: #e25555;
  font-size: 1.1em;
  vertical-align: middle;
}

.site-footer a {
  color: #6c757d;
  text-decoration: none;
  font-weight: 500;
}

.site-footer a:hover {
  text-decoration: underline;
}

.container {
  flex: 1 0 auto;
}

.wiki-summary {
  color: #333;
  line-height: 1.5;
}
.wiki-btn {
  background: var(--primary-gradient);
  border: none;
  color: whitesmoke !important;
  border-radius: 25px;
  padding: 0.25rem 0.75rem;
  font-size: 0.9rem;
  transition: transform 0.2s ease;
}
.wiki-btn:hover {
  transform: translateY(-2px);
}