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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto; /* Esto centra all el contenido del container*/
            background: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            padding: 30px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            backdrop-filter: blur(10px);
        }

        /* Agregado por fgo */
        .user-signature {
          position: absolute;
          bottom: 10px;
          right:  20px;
          font-style: italic;
          color: #6c757d; /* gris Bootstrap */
        }

        /* Agregado por fgo until close-link:hover*/ 
        /* Texto Close igual que la firma */
        .close-signature {
          position: absolute;
          top: 90px;        /* ajusta según la altura de tu h1 */
          right: 40px;       /* mismo margen que la firma */
          font-style: italic;
          color: #6c757d;    /* gris elegante */
          cursor: pointer;


         /* efecto hundido */
            text-shadow: 1px 1px 0 #fff, 
                         -1px -1px 0 #ccc;
            transition: color 0.2s ease-in-out;
        }

        .close-signature:hover {
          color: #dc3545;    /* rojo al pasar el mouse */
        }

        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
            font-size: 2.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
        }

        .tab-container {
            display: flex;
            background: #f8f9fa;
            border-radius: 15px;
            padding: 5px;
            margin-bottom: 30px;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .tab-button {
            flex: 1;
            padding: 15px 20px;
            border: none;
            background: transparent;
            cursor: pointer;
            border-radius: 10px;
            transition: all 0.3s ease;
            font-weight: 600;
            color: #666;
        }

        .tab-button.active {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .tab-content {
            display: none;
            animation: fadeIn 0.5s ease;
        }

        .tab-content.active {
            display: block;
        }

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

        .form-container {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 30px;
            border: 2px solid #e9ecef;
        }

        .form-row {
            display: flex;
            gap: 15px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .form-group {
            flex: 1;
            min-width: 200px;
        }

        label {
            display: block;
            margin-bottom: 5px;
            font-weight: 600;
            color: #333;
        }

        input, select {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e9ecef;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        input:focus, select:focus {
            border-color: #667eea;
            outline: none;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
            transform: translateY(-1px);
        }

        .btn {
            padding: 12px 30px;
            border: none;
            border-radius: 25px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .btn-success {
            background: linear-gradient(135deg, #56ab2f 0%, #a8e6cf 100%);
            color: white;
        }

        .btn-warning {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            color: white;
        }

        .btn-danger {
            background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
            color: white;
        }

        .btn-secondary {
            background: linear-gradient(135deg, #74b9ff 0%, #0984e3 100%);
            color: white;
        }

        .table-container {
            overflow-x: auto;
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        table {
            width: 100%;
            border-collapse: collapse;
        }

        th, td {
            padding: 15px;
            text-align: left;
            border-bottom: 1px solid #e9ecef;
        }

        th {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        tr:hover {
            background: #f8f9fa;
            transform: scale(1.01);
            transition: all 0.3s ease;
        }

        .actions {
            display: flex;
            gap: 10px;
        }

        .actions button {
            padding: 8px 15px;
            font-size: 14px;
        }

        .birthday-section {
            display: flex;
            gap: 20px;
            align-items: center;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .month-selector {
            flex: 1;
            min-width: 200px;
        }

        .birthday-results {
            background: white;
            border-radius: 15px;
            padding: 25px;
            margin-top: 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .birthday-card {
            background: linear-gradient(135deg, #a8e6cf 0%, #dcedc1 100%);
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 15px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease;
        }

        .birthday-card:hover {
            transform: translateY(-2px);
        }

        .birthday-card h3 {
            color: #2d3436;
            margin-bottom: 10px;
        }

        .birthday-card p {
            color: #636e72;
            margin-bottom: 5px;
        }

        .no-results {
            text-align: center;
            color: #636e72;
            font-style: italic;
            padding: 40px;
        }

        .loading {
            text-align: center;
            padding: 20px;
        }

        .spinner {
            border: 4px solid #f3f3f3;
            border-top: 4px solid #667eea;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .error {
            background: #ff6b6b;
            color: white;
            padding: 15px;
            border-radius: 10px;
            margin: 10px 0;
            text-align: center;
        }

        .success {
            background: #56ab2f;
            color: white;
            padding: 15px;
            border-radius: 10px;
            margin: 10px 0;
            text-align: center;
        }

        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }

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

            .birthday-section {
                flex-direction: column;
                align-items: stretch;
            }

            .actions {
                justify-content: center;
            }
        }

        /* Footer */
        .footer-cosmos {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 25px;
            text-align: center;
            border-radius: 15px;
            margin-top: 40px;
            box-shadow: 0 -5px 15px rgba(0,0,0,0.1);
            font-size: 16px;
        }

        .footer-cosmos .empresa-info {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .footer-cosmos .redes-sociales a {
            margin: 0 10px;
            display: inline-block;
        }

        .footer-cosmos .redes-sociales img {
            width: 28px;
            height: 28px;
            filter: invert(1);
            transition: transform 0.3s ease;
        }

        .footer-cosmos .redes-sociales img:hover {
            transform: scale(1.2);
        }

        .footer-cosmos .anio-dinamico {
            margin-top: 10px;
            font-weight: 500;
        }
     
        .loading-screen {
          position: fixed;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          background: linear-gradient(135deg, #667eea, #764ba2);
          color: white;
          display: flex;
          flex-direction: column;
          justify-content: center;
          align-items: center;
          z-index: 9999;
          font-size: 20px;
          font-weight: 500;
          transition: opacity 0.8s ease;
        }

        .logo-loading {
          width: 64px;
          height: 64px;
          margin-bottom: 15px;
        }