* {
            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;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow-x: hidden;
        }

        .login-container {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            padding: 2.5rem;
            width: 100%;
            max-width: 400px;
            margin: 1rem;
            position: relative;
            animation: slideIn 0.8s ease-out;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(50px) scale(0.9);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .login-header {
            text-align: center;
            margin-bottom: 2rem;
        }

        .login-title {
            color: #333;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            position: relative;
        }

        .login-subtitle {
            color: #666;
            font-size: 0.9rem;
            opacity: 0;
            animation: fadeIn 1s ease-in 0.3s forwards;
        }

        @keyframes fadeIn {
            to {
                opacity: 1;
            }
        }

        .form-group {
            margin-bottom: 1.5rem;
            position: relative;
        }

        .form-control {
            width: 100%;
            padding: 1rem 1.2rem;
            font-size: 1rem;
            border: 2px solid #e1e5e9;
            border-radius: 50px;
            background: #fff;
            transition: all 0.3s ease;
            outline: none;
            position: relative;
        }

        .form-control:focus {
            border-color: #28a745;
            box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
            transform: translateY(-2px);
        }

        .form-control:hover {
            border-color: #c3c7cc;
            transform: translateY(-1px);
        }

        .form-control::placeholder {
            color: #999;
            transition: all 0.3s ease;
        }

        .form-control:focus::placeholder {
            opacity: 0.7;
            transform: translateX(5px);
        }

        .checkbox-container {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            
            justify-content: center;
            margin-bottom: 1.5rem;
            user-select: none;
        }

        .custom-checkbox {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 0.5rem;
            position: relative; 
        }

        .custom-checkbox input {
            opacity: 0;
            position: absolute;
            cursor: pointer;
        }

        .checkmark {
            display: inline-block;
            height: 20px;
            width: 20px;
            background-color: #fff;
            border: 2px solid #e1e5e9;
            border-radius: 4px;
            transition: all 0.3s ease;
            box-sizing: border-box;
        }

        .custom-checkbox:hover input ~ .checkmark {
            border-color: #28a745;
            transform: scale(1.1);
        }

        .custom-checkbox input:checked ~ .checkmark {
            background-color: #28a745;
            border-color: #28a745;
            animation: checkPulse 0.3s ease;
        }

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

        .checkmark:after {
            content: "";
            position: absolute;
            display: none;
        }

        .custom-checkbox input:checked ~ .checkmark:after {
            display: block;
        }

        .custom-checkbox .checkmark:after {
            left: 6px;
            top: 2px;
            width: 6px;
            height: 10px;
            border: solid white;
            border-width: 0 2px 2px 0;
            transform: rotate(45deg);
        }

        .checkbox-label {
            color: #666;
            font-size: 0.9rem;
            cursor: pointer;
            transition: color 0.3s ease;
        }

        .checkbox-label:hover {
            color: #28a745;
        }

        .btn-login {
            width: 100%;
            padding: 1rem;
            font-size: 1.1rem;
            font-weight: 600;
            color: white;
            background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .btn-login::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
            transition: left 0.5s;
        }

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

        .btn-login:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(40, 167, 69, 0.4);
        }

        .btn-login:active {
            transform: translateY(-1px);
        }

        .divider {
            margin: 1.5rem 0;
            position: relative;
            text-align: center;
        }

        .divider::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 1px;
            background: #e1e5e9;
        }

        .divider span {
            background: rgba(255, 255, 255, 0.95);
            padding: 0 1rem;
            color: #999;
            font-size: 0.9rem;
        }

        /* Efectos de partículas de fondo */
        .bg-particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            overflow: hidden;
        }

        .particle {
            position: absolute;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            animation: float 6s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(180deg); }
        }

        /* Responsivo */
        @media (max-width: 480px) {
            .login-container {
                padding: 2rem 1.5rem;
                margin: 0.5rem;
            }

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

            .form-control {
                padding: 0.9rem 1rem;
            }

            .btn-login {
                padding: 0.9rem;
                font-size: 1rem;
            }
        }

        /* Animaciones de entrada escalonadas */
        .form-group:nth-child(1) { animation: slideInLeft 0.6s ease-out 0.2s both; }
        .form-group:nth-child(2) { animation: slideInLeft 0.6s ease-out 0.4s both; }
        .checkbox-container { animation: slideInLeft 0.6s ease-out 0.6s both; }
        .btn-login { animation: slideInUp 0.6s ease-out 0.8s both; }

        @keyframes slideInLeft {
            from {
                opacity: 0;
                transform: translateX(-30px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        @keyframes slideInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }