body {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      min-height: 100vh;
    }

    /* HEADER SECTION - MEJORADO */
    .header-section {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 25px;
      padding: 30px;
      margin-bottom: 30px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
      position: relative;
      overflow: hidden;
    }

    .header-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4, #feca57);
      background-size: 300% 300%;
      animation: gradientShift 3s ease infinite;
    }

    @keyframes gradientShift {
      0%, 100% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
    }

    .header-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 25px;
      gap: 20px;
    }

    .title-section {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .title-main {
      font-size: 2.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      background-clip: text;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin: 0;
      text-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

    .title-subtitle {
      font-size: 1rem;
      color: rgba(255, 255, 255, 0.8);
      font-weight: 400;
      margin: 0;
    }

    .btn-nuevo-curso {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: white;
      border: none;
      border-radius: 50px;
      padding: 15px 30px;
      font-size: 16px;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      position: relative;
      overflow: hidden;
    }

    .btn-nuevo-curso::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
      transition: left 0.5s;
    }

    .btn-nuevo-curso:hover::before {
      left: 100%;
    }

    .btn-nuevo-curso:hover {
      transform: translateY(-3px) scale(1.05);
      box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
      color: white;
      text-decoration: none;
    }

    .btn-nuevo-curso:active {
      transform: translateY(-1px) scale(1.02);
    }

    /* FILTER SECTION - MEJORADO */
    .filter-section {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 25px;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }

    .filter-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: #4a5568;
      margin-bottom: 15px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .filter-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .filter-group {
      position: relative;
    }

    .filter-container input,
    .filter-container select {
      width: 100%;
      padding: 15px 20px;
      font-size: 16px;
      border: 2px solid #e2e8f0;
      border-radius: 15px;
      background: white;
      transition: all 0.3s ease;
      box-sizing: border-box;
      font-family: inherit;
    }

    .filter-container input:focus,
    .filter-container select:focus {
      border-color: #667eea;
      outline: none;
      box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
      transform: translateY(-2px);
    }

    .filter-container input::placeholder {
      color: #a0aec0;
      font-weight: 400;
    }

    .clear-filters-btn {
      background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
      color: white;
      border: none;
      border-radius: 15px;
      padding: 15px 25px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      display: flex;
      align-items: center;
      gap: 8px;
      justify-self: end;
    }

    .clear-filters-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(255, 107, 107, 0.3);
    }

    /* Estilo para las tarjetas - SIN CAMBIOS */
    .card {
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      animation: fadeInUp 0.8s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
      border-radius: 10px;
      overflow: hidden;
      background: #fff;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    }

    .card-img-top {
      height: 200px;
      object-fit: cover;
      border-bottom: 1px solid #ddd;
    }

    .card-body {
      padding: 15px;
    }

    .card-body h5 {
      font-size: 18px;
      font-weight: 600;
      color: #333;
    }

    .card-body p {
      color: #666;
    }

    .btn {
      padding: 10px;
      font-size: 14px;
      text-align: center;
      border-radius: 30px;
      font-weight: normal;
      transition: all 0.3s ease;
      margin-top: 10px;
    }

    .btn-outline-primary {
      border-color: #6c5ce7;
      color: #6c5ce7;
    }
    .btn-outline-primary:hover {
      background-color: #6c5ce7;
      color: white;
      transform: scale(1.05);
    }

    .btn-outline-warning {
      border-color: #f39c12;
      color: #f39c12;
    }
    .btn-outline-warning:hover {
      background-color: #f39c12;
      color: white;
      transform: scale(1.05);
    }

    .btn-outline-danger {
      border-color: #e74c3c;
      color: #e74c3c;
    }
    .btn-outline-danger:hover {
      background-color: #e74c3c;
      color: white;
      transform: scale(1.05);
    }

    .btn-group {
      display: flex;
      flex-direction: row;
      justify-content: space-between;
      gap: 10px;
      margin-top: 10px;
    }

    .btn-group .btn {
      flex: 1;
      margin: 0;
    }

    /* Responsividad */
    @media (max-width: 768px) {
      .header-container {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
      }

      .title-main {
        font-size: 2rem;
        text-align: center;
      }

      .title-subtitle {
        text-align: center;
      }

      .btn-nuevo-curso {
        align-self: center;
        font-size: 14px;
        padding: 12px 25px;
      }

      .filter-container {
        grid-template-columns: 1fr;
        gap: 15px;
      }

      .clear-filters-btn {
        justify-self: stretch;
      }
    }

    @media (max-width: 480px) {
      .header-section {
        padding: 20px;
      }

      .filter-section {
        padding: 20px;
      }

      .title-main {
        font-size: 1.8rem;
      }
    }